/* roulang page: index */
:root{
  --bg:#081120;
  --bg-deep:#060d1a;
  --bg-panel:#0C1830;
  --bg-soft:#0E1E38;
  --glass:rgba(17,30,52,.64);
  --glass-soft:rgba(255,255,255,.055);
  --line:rgba(128,184,255,.16);
  --line-strong:rgba(128,184,255,.34);
  --glow:rgba(82,214,245,.45);
  --text:#EDF5FF;
  --text-sub:#A3B7D2;
  --text-mute:#7891B2;
  --cyan:#35C9E8;
  --blue:#5A79FF;
  --amber:#FFBE5C;
  --amber-deep:#F79B3E;
  --grad-cyan:linear-gradient(135deg,#35C9E8,#5A79FF);
  --grad-amber:linear-gradient(135deg,#FFBE5C,#F79B3E);
  --shadow:0 8px 24px rgba(2,8,23,.22);
  --shadow-up:0 16px 36px rgba(2,8,23,.34);
  --r-lg:20px;
  --r-md:16px;
  --r-sm:10px;
  --r-btn:12px;
  --font-main:"PingFang SC","Microsoft YaHei","Noto Sans CJK SC","Source Han Sans SC",sans-serif;
  --font-number:Bahnschrift,"DIN Alternate","Arial Narrow",sans-serif;
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:120px}
body{margin:0;background:var(--bg);color:var(--text);font-family:var(--font-main);font-size:16px;line-height:1.85;-webkit-font-smoothing:antialiased}
img{max-width:100%;height:auto;display:block}
a{color:var(--cyan);text-decoration:none;transition:color .22s ease,border-color .22s ease,background .22s ease,box-shadow .22s ease}
a:hover{color:#8BE3FF}
a:focus-visible,button:focus-visible,input:focus-visible,textarea:focus-visible,summary:focus-visible{outline:2px solid var(--amber);outline-offset:3px}
h1,h2,h3,p,figure{margin:0}
h1,h2,h3{line-height:1.35;letter-spacing:.01em}
h1{font-size:clamp(2.1rem,4.6vw,3.5rem);font-weight:700}
h2{font-size:clamp(1.5rem,2.8vw,2.2rem);font-weight:650}
h3{font-size:1.2rem;font-weight:600}
button,input,textarea,select{font-family:inherit}
.container{max-width:1200px;margin:0 auto;padding:0 24px}
.section{padding:clamp(3rem,7vw,5.25rem) 0;position:relative}
.glass-panel{background:var(--glass);border:1px solid var(--line);border-radius:var(--r-lg);box-shadow:var(--shadow);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px)}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:46px;padding:.78rem 1.5rem;border-radius:var(--r-btn);font-weight:600;font-size:.95rem;border:1px solid transparent;line-height:1;cursor:pointer;transition:transform .2s ease,box-shadow .2s ease,background .2s ease,border-color .2s ease,color .2s ease;user-select:none}
.btn svg{width:18px;height:18px;flex:none}
.btn-primary{background:var(--grad-cyan);color:#061022 !important;box-shadow:0 0 0 1px rgba(255,255,255,.18) inset,0 8px 22px rgba(53,201,232,.3)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 0 0 1px rgba(255,255,255,.24) inset,0 14px 28px rgba(53,201,232,.4);color:#04101F !important}
.btn-primary:active{transform:translateY(-1px) scale(.98)}
.btn-ghost{background:rgba(255,255,255,.06);color:#EAF4FF;border-color:rgba(139,189,255,.28)}
.btn-ghost:hover{background:rgba(53,201,232,.12);border-color:rgba(82,214,245,.5);transform:translateY(-2px);color:#fff}
.btn-ghost:active{transform:translateY(-1px) scale(.98)}
.btn-amber{background:var(--grad-amber);color:#2A1A06 !important;box-shadow:0 8px 20px rgba(255,190,92,.24)}
.btn-amber:hover{color:#221200 !important;transform:translateY(-2px);box-shadow:0 12px 26px rgba(255,190,92,.38)}
.btn-sm{min-height:38px;padding:.5rem 1.05rem;font-size:.88rem}
.badge{display:inline-flex;align-items:center;gap:6px;padding:.24rem .8rem;border-radius:999px;font-size:.8rem;line-height:1.6;border:1px solid transparent;white-space:nowrap}
.badge-cyan{background:rgba(53,201,232,.14);color:#9CE7F8;border-color:rgba(53,201,232,.24)}
.badge-amber{background:rgba(255,190,92,.12);color:var(--amber);border-color:rgba(255,190,92,.26)}
.badge-mute{background:rgba(163,183,210,.1);color:var(--text-sub);border-color:rgba(163,183,210,.18)}
.tag{display:inline-flex;align-items:center;gap:8px;padding:.42rem .9rem;background:rgba(255,255,255,.05);border:1px solid var(--line);border-radius:999px;color:var(--text-sub);font-size:.85rem;transition:border-color .2s ease,color .2s ease,background .2s ease}
.tag:hover{color:#fff;border-color:var(--glow);background:rgba(53,201,232,.08)}

/* 全站导航 */
.site-header{position:sticky;top:0;z-index:100;padding:10px 0 4px}
.site-header .grid-container{max-width:1280px}
.nav-shell{display:flex;align-items:center;gap:18px;padding:.85rem 1rem;border-radius:18px;background:rgba(8,17,32,.88);border:1px solid rgba(128,184,255,.18);box-shadow:0 12px 28px rgba(1,5,14,.38),0 0 0 1px rgba(255,255,255,.02);backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px)}
.brand{display:inline-flex;align-items:center;flex:none;padding:2px 14px 2px 2px}
.brand-mark{font-size:1.38rem;font-weight:700;letter-spacing:-.5px}
.brand-j{color:var(--cyan)}
.brand-nine{color:var(--amber)}
.brand-domain{color:var(--text-sub);font-weight:600}
.main-nav{display:flex;align-items:center;gap:6px;flex:1;min-width:0;overflow-x:auto;scrollbar-width:none}
.main-nav::-webkit-scrollbar{display:none}
.nav-item{flex:none;display:inline-flex;align-items:center;padding:.56rem 1rem;border-radius:12px;font-size:.93rem;color:var(--text-sub);background:rgba(255,255,255,.035);border:1px solid transparent}
.nav-item:hover{color:#fff;background:rgba(255,255,255,.08)}
.nav-item.is-active{color:#EAFBFF;background:rgba(53,201,232,.12);border-color:rgba(53,201,232,.3);box-shadow:inset 0 0 18px rgba(53,201,232,.08)}
.nav-item.is-active::after{content:"";width:18px;height:2px;background:var(--cyan);border-radius:2px;margin:0 auto -6px;display:none}
.nav-cta{flex:none;margin-left:2px}

/* Hero */
.hero{position:relative;padding:clamp(4.6rem,9vw,7rem) 0 5rem;overflow:hidden;background-image:linear-gradient(100deg,rgba(5,13,26,.96) 0%,rgba(8,20,38,.88) 42%,rgba(8,22,41,.48) 100%),url('/assets/images/backpic/back-1.webp');background-size:cover;background-position:center}
.hero::after{content:"";position:absolute;inset:0;pointer-events:none;background-image:linear-gradient(rgba(163,210,255,.045) 1px,transparent 1px),linear-gradient(90deg,rgba(163,210,255,.045) 1px,transparent 1px);background-size:44px 44px;mask-image:radial-gradient(ellipse at top,rgba(0,0,0,.85),transparent 72%)}
.hero .grid-container{position:relative;z-index:2}
.hero-inner{max-width:760px}
.hero-eyebrow{display:inline-flex;align-items:center;gap:10px;padding:.5rem 1rem;margin-bottom:1.6rem;border-radius:999px;background:rgba(53,201,232,.1);border:1px solid rgba(53,201,232,.28);color:#BFEFFB;font-size:.84rem}
.pulse-dot{width:7px;height:7px;border-radius:50%;background:var(--amber);box-shadow:0 0 0 0 rgba(255,190,92,.7);animation:pulse 2.2s infinite}
@keyframes pulse{0%{box-shadow:0 0 0 0 rgba(255,190,92,.7)}70%{box-shadow:0 0 0 9px rgba(255,190,92,0)}100%{box-shadow:0 0 0 0 rgba(255,190,92,0)}}
.hero-title{color:#fff;text-shadow:0 2px 26px rgba(0,0,0,.18)}
.hero-desc{margin-top:1.2rem;font-size:1.08rem;line-height:2;color:var(--text-sub);max-width:640px}
.hero-actions{display:flex;flex-wrap:wrap;gap:14px;margin-top:2.2rem}
.hero-strip{display:grid;grid-template-columns:repeat(3,1fr);gap:1px;margin-top:-2rem;position:relative;z-index:5;overflow:hidden}
.hero-strip .glass-panel{background:rgba(13,25,45,.82);border:1px solid rgba(128,184,255,.18)}
.hero-chip{display:flex;align-items:center;gap:14px;padding:1.2rem 1.3rem;color:var(--text);min-width:0;}
.hero-chip+.hero-chip{border-left:1px solid rgba(128,184,255,.13)}
.hero-chip:hover{background:rgba(53,201,232,.06);color:#fff}
.chip-no{font-family:var(--font-number);font-size:1.4rem;font-weight:700;color:var(--amber);flex:none}
.chip-main{display:flex;flex-direction:column;min-width:0}
.chip-main strong{font-size:1rem;line-height:1.5}
.chip-main small{margin-top:3px;font-size:.84rem;color:var(--text-mute);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.chip-arrow{color:var(--text-mute);margin-left:auto;flex:none}
.hero-chip:hover .chip-arrow{color:var(--cyan)}

/* 板块通用头部 */
.section-head{display:flex;align-items:flex-end;justify-content:space-between;gap:32px;margin-bottom:2.2rem}
.section-kicker{display:inline-block;font-size:.86rem;letter-spacing:.02em;color:var(--amber);margin-bottom:.6rem;font-weight:600}
.section-desc{color:var(--text-mute);font-size:.98rem;line-height:1.9;max-width:380px}

/* 目录区 */
.directory-section{background:linear-gradient(180deg,var(--bg),rgba(18,32,58,.55) 100%)}
.catalog-list{overflow:hidden;padding:10px}
.catalog-row{display:grid;grid-template-columns:76px 96px 1fr 40px;align-items:center;gap:22px;padding:22px 24px;border-radius:18px;color:var(--text);border:1px solid transparent;transition:border-color .25s ease,background .25s ease,box-shadow .25s ease,transform .25s ease}
.catalog-row+.catalog-row{margin-top:6px}
.catalog-row:hover{transform:translateY(-2px);background:rgba(53,201,232,.06);border-color:rgba(53,201,232,.24);box-shadow:0 12px 28px rgba(1,5,14,.24);color:#fff}
.catalog-no{font-family:var(--font-number);font-size:2.1rem;font-weight:700;color:var(--amber);line-height:1;opacity:.95}
.catalog-cover{width:96px;height:70px;border-radius:14px;overflow:hidden;background:linear-gradient(135deg,rgba(53,201,232,.16),rgba(90,121,255,.12));border:1px solid var(--line)}
.catalog-cover img{width:100%;height:100%;object-fit:cover}
.catalog-detail{min-width:0}
.catalog-detail strong{font-size:1.18rem;display:block;line-height:1.6;color:#fff}
.catalog-detail small{display:block;color:var(--text-sub);margin-top:6px;max-width:620px;line-height:1.85}
.catalog-go{width:38px;height:38px;border:1px solid var(--line);border-radius:10px;display:flex;align-items:center;justify-content:center;color:var(--text-sub)}
.catalog-row:hover .catalog-go{background:rgba(53,201,232,.14);border-color:rgba(53,201,232,.3);color:#fff}

/* 组织特色区 */
.feature-section .glass-panel{background:var(--glass)}
.feature-heading{height:100%;padding:2.2rem;display:flex;flex-direction:column;justify-content:space-between;gap:2rem;min-height:360px}
.feature-heading h2{margin-top:.9rem}
.feature-heading p{color:var(--text-sub);margin-top:1.2rem;font-size:.98rem}
.feature-list{display:grid;grid-template-columns:repeat(2,1fr);gap:16px;height:100%}
.feature-item{padding:1.6rem;border-radius:18px;background:var(--glass);border:1px solid var(--line);box-shadow:var(--shadow);transition:transform .25s ease,border-color .25s ease;min-height:250px}
.feature-item:hover{transform:translateY(-2px);border-color:rgba(53,201,232,.3);background:rgba(20,37,63,.7)}
.f-no{font-family:var(--font-number);font-size:1.3rem;font-weight:700;color:var(--cyan);display:inline-flex;align-items:center;gap:10px}
.f-no::after{content:"";width:16px;height:2px;background:var(--cyan);opacity:.6}
.feature-item h3{margin-top:10px;color:#fff}
.feature-item p{margin-top:.8rem;color:var(--text-sub);font-size:.92rem;line-height:1.85}

/* 精选区 */
.featured-section{background:radial-gradient(ellipse at 85% 20%,rgba(53,201,232,.06),transparent 60%)}
.featured-head{padding:2.1rem;height:100%;min-height:300px;display:flex;flex-direction:column;justify-content:space-between}
.featured-head h2{margin:.8rem 0}
.featured-head .featured-switch{display:flex;flex-direction:column;gap:12px}
.featured-list{display:flex;flex-direction:column;gap:14px}
.featured-item{display:flex;gap:20px;align-items:center;padding:16px;border-radius:18px;color:var(--text);background:var(--glass);border:1px solid var(--line);transition:transform .25s,border-color .25s;box-shadow:var(--shadow)}
.featured-item:hover{transform:translateY(-2px);border-color:rgba(53,201,232,.32);color:#fff}
.featured-cover{width:116px;height:82px;border-radius:13px;overflow:hidden;flex:none;background:rgba(53,201,232,.08)}
.featured-cover img{width:100%;height:100%;object-fit:cover}
.featured-body{min-width:0;flex:1}
.featured-body h3{font-size:1.06rem;line-height:1.6;color:#fff;margin-top:.24rem}
.featured-body p{margin-top:.55rem;color:var(--text-mute);font-size:.92rem;line-height:1.8;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.featured-meta{display:flex;align-items:center;gap:12px;margin-top:.7rem;color:var(--text-mute);font-size:.82rem}
.featured-arrow{width:36px;height:36px;border-radius:10px;border:1px solid var(--line);display:flex;align-items:center;justify-content:center;color:var(--text-mute);flex:none;transition:.22s}
.featured-item:hover .featured-arrow{background:rgba(255,190,92,.16);border-color:rgba(255,190,92,.4);color:var(--amber)}

/* 最新信息动态 */
.updates-section{background:var(--bg)}
.updates-wrap{border-radius:24px;padding:1rem;background:linear-gradient(180deg,rgba(18,34,61,.7),rgba(8,17,32,.85));border:1px solid rgba(128,184,255,.18);box-shadow:var(--shadow)}
.updates-head{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:14px;padding:.5rem .5rem 1rem;border-bottom:1px solid var(--line);margin-bottom:.4rem}
.updates-head .h2-wrap{display:flex;align-items:baseline;gap:16px;flex-wrap:wrap}
.updates-head h2{font-size:clamp(1.35rem,2.4vw,1.9rem)}
.updates-head p{color:var(--text-mute);font-size:.9rem}
.update-row{display:grid;grid-template-columns:56px minmax(0,1fr) 230px;align-items:center;gap:24px;padding:1.2rem .6rem;border-bottom:1px solid rgba(128,184,255,.1)}
.update-row:last-child{border-bottom:0}
.update-row:hover .update-title-link{color:#9be8fb}
.up-num{font-family:var(--font-number);font-weight:700;font-size:1.5rem;color:rgba(128,184,255,.45);line-height:1}
.up-main{min-width:0}
.up-main h3{font-size:1rem;margin-bottom:.3rem}
.up-main h3 a{color:#fff;transition:color .2s}
.up-excerpt{color:var(--text-mute);font-size:.92rem;line-height:1.75;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;max-width:680px}
.up-side{display:flex;align-items:center;justify-content:flex-end;gap:12px;font-size:.86rem;color:var(--text-mute)}
.up-side time{white-space:nowrap}
.updates-empty{display:flex;flex-direction:column;align-items:center;gap:12px;padding:3.5rem 1rem 3rem;background:rgba(255,255,255,.025);border:1px dashed rgba(128,184,255,.18);border-radius:18px;color:var(--text-mute);font-size:.94rem}
.idle-panel{width:74px;height:56px;border-radius:12px;display:flex;flex-direction:column;gap:5px;border:1px solid var(--line);background:rgba(128,184,255,.04);justify-content:center;align-items:center}
.idle-panel i{width:28px;height:3px;background:rgba(120,145,178,.26);border-radius:4px;display:block}
.idle-panel i:nth-child(2){width:18px}

/* 延伸推荐 */
.recommended-section{background:var(--bg);position:relative}
.recommended-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:20px}
.reco-large{position:relative;min-height:250px;border-radius:22px;overflow:hidden;display:block;border:1px solid var(--line);box-shadow:var(--shadow);transition:transform .28s ease,border-color .28s ease}
.reco-large:hover{transform:translateY(-3px);border-color:rgba(53,201,232,.4)}
.reco-large img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}
.reco-large-overlay{position:absolute;inset:0;background:linear-gradient(180deg,rgba(6,14,28,.1) 30%,rgba(6,14,28,.94) 100%);padding:1.8rem;display:flex;flex-direction:column;justify-content:flex-end;color:#fff}
.reco-large-overlay .tag{align-self:flex-start;margin-bottom:auto}
.reco-large-overlay h3{margin-top:.8rem;font-size:1.38rem}
.reco-large-overlay p{margin-top:.55rem;color:#C1D4EC;font-size:.94rem}
.reco-small-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:20px}
.reco-card{position:relative;min-height:220px;border-radius:18px;overflow:hidden;border:1px solid var(--line);display:flex;flex-direction:column;justify-content:flex-end;padding:1.3rem;color:#fff;background-size:cover;background-position:center;box-shadow:var(--shadow);transition:transform .28s,border-color .28s}
.reco-card:hover{transform:translateY(-3px);border-color:rgba(53,201,232,.36);color:#fff}
.reco-card::before{content:"";position:absolute;inset:0;background:linear-gradient(180deg,transparent 42%,rgba(5,12,24,.92) 100%)}
.reco-card img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;z-index:0}
.reco-card .reco-content{position:relative;z-index:2}
.reco-card .tag{margin-bottom:.65rem}
.reco-card h3{font-size:.98rem;line-height:1.6}

/* 收藏 CTA */
.save-section{background:radial-gradient(ellipse at center,rgba(255,190,92,.06),transparent 68%)}
.save-panel{padding:2.4rem;display:flex;align-items:center;justify-content:space-between;gap:2.4rem;flex-wrap:wrap;border-radius:24px;border-color:rgba(255,190,92,.34);background:linear-gradient(90deg,rgba(30,37,48,.88),rgba(26,35,52,.88));box-shadow:0 0 0 1px rgba(255,190,92,.08),0 20px 40px rgba(5,10,20,.32)}
.save-copy h2{color:#fff}
.save-copy p{margin-top:1rem;color:var(--text-mute);max-width:560px}
.save-actions{display:flex;flex-wrap:wrap;gap:14px}
.save-pill{font-size:.84rem;color:var(--amber);background:rgba(255,190,92,.1);border:1px solid rgba(255,190,92,.24);border-radius:999px;padding:.3rem .9rem}
.brand-mark-amber{display:inline-flex;gap:8px;margin-top:1rem;font-size:2rem;font-weight:700;font-family:var(--font-number)}

/* FAQ */
.faq-section{background:#0A1426}
.faq-inner{max-width:860px;margin:0 auto}
.faq-panel{display:flex;flex-direction:column;gap:14px;margin-top:2rem}
.faq-item{background:var(--glass);border:1px solid var(--line);border-radius:18px;overflow:hidden;transition:border-color .25s}
.faq-item[open]{border-color:rgba(53,201,232,.45)}
.faq-item summary{list-style:none;display:flex;align-items:center;justify-content:space-between;gap:18px;padding:1.25rem 1.5rem;cursor:pointer;font-weight:600;font-size:1rem;background:transparent;user-select:none}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary:hover{background:rgba(53,201,232,.05)}
.faq-item .faq-icon{width:28px;height:28px;flex:none;border:1px solid rgba(128,184,255,.32);border-radius:8px;display:flex;align-items:center;justify-content:center;font-size:1.1rem;color:var(--text-sub);transition:transform .3s,color .2s,border-color .2s}
.faq-item[open] .faq-icon{transform:rotate(45deg);color:var(--amber);border-color:var(--amber)}
.faq-answer{padding:0 1.5rem 1.4rem;color:var(--text-sub);font-size:.97rem;line-height:1.95;max-width:760px}

/* 联系区块 */
.contact-section{background:#081120}
.contact-grid{display:grid;grid-template-columns:1fr 1.1fr;gap:28px}
.contact-info{padding:2.2rem 2.2rem 2.6rem;display:flex;flex-direction:column}
.contact-info h2{margin:1.2rem 0 .9rem;color:#fff}
.contact-info p{color:var(--text-sub);line-height:2}
.contact-points{display:flex;flex-direction:column;gap:14px;margin-top:auto;padding-top:2rem}
.contact-point{display:flex;align-items:center;gap:12px;font-size:.92rem;color:var(--text-sub)}
.contact-point svg{width:22px;height:22px;color:var(--cyan)}
.contact-form{padding:2rem 2rem 2.4rem}
.contact-form .form-note{margin-top:1.2rem;font-size:.95rem;color:#9FE5BA;display:none}
.input-row{display:grid;grid-template-columns:1fr 1fr;gap:18px}
label.field{display:block;margin:0 0 18px}
.field span{display:block;margin-bottom:8px;font-size:.88rem;color:var(--text-sub);font-weight:600}
.form-input{width:100%;background:rgba(8,17,32,.68);border:1px solid rgba(128,184,255,.25);border-radius:12px;color:var(--text);padding:.85rem 1rem;font-size:.96rem;transition:border-color .25s,box-shadow .25s}
.form-input::placeholder{color:#5B7BA0}
.form-input:focus{outline:none;border-color:var(--cyan);box-shadow:0 0 0 4px rgba(53,201,232,.14)}
textarea.form-input{min-height:120px;resize:vertical}

/* 页脚 */
.site-footer{margin-top:0;background:#050C17;border-top:1px solid rgba(128,184,255,.12);position:relative}
.site-footer::before{content:"";position:absolute;inset:0;pointer-events:none;background-image:radial-gradient(rgba(255,255,255,.035) 1px,transparent 1px);background-size:30px 30px;mask-image:linear-gradient(to bottom,rgba(0,0,0,.8),transparent 90%)}
.footer-top{padding:3.6rem 0 2.4rem;position:relative;z-index:2}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:36px}
.footer-brand{font-size:1.8rem;font-weight:700;color:#fff;display:inline-flex;align-items:center}
.footer-brand small{font-size:1rem;color:var(--text-mute);font-weight:400;margin-left:12px;letter-spacing:.04em}
.footer-about p{color:var(--text-mute);font-size:.9rem;margin-top:1rem;max-width:320px}
.footer-column h4{color:#fff;font-size:.95rem;margin-bottom:1.1rem}
.footer-column ul{list-style:none;margin:0;padding:0}
.footer-column li{margin-bottom:.7rem}
.footer-column a{color:var(--text-sub);font-size:.92rem;display:inline-flex;align-items:center;gap:8px}
.footer-column a:hover{color:#fff}
.footer-column a::before{content:"";width:4px;height:4px;background:var(--cyan);border-radius:50%;opacity:.7}
.footer-bottom{padding:1.4rem 0 1.6rem;position:relative;z-index:2;border-top:1px solid rgba(128,184,255,.08)}
.footer-bottom-inner{display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap;color:var(--text-mute);font-size:.86rem}
.tech-domain{color:#5A7DA4}

/* 滚动条 */
::-webkit-scrollbar{width:10px;height:10px}
::-webkit-scrollbar-thumb{background:#233E63;border-radius:8px;border:2px solid var(--bg)}
::-webkit-scrollbar-thumb:hover{background:#2E4C78}
::selection{background:rgba(255,190,92,.26);color:#fff}

@media(max-width:1100px){
  .hero-strip{grid-template-columns:1fr}
  .hero-chip{border-left:0;border-top:1px solid rgba(128,184,255,.1)}
  .hero-chip+.hero-chip{border-left:0}
  .catalog-row{grid-template-columns:62px 80px 1fr 36px;gap:16px}
  .catalog-cover{width:80px;height:62px}
  .feature-list{grid-template-columns:1fr}
  .feature-item{min-height:auto}
  .recommended-grid{grid-template-columns:1fr}
  .contact-grid{grid-template-columns:1fr}
}
@media(max-width:900px){
  .nav-shell{gap:12px;padding:.7rem .8rem}
  .nav-cta{margin-left:auto}
  .brand-domain{display:none}
  .main-nav{margin-left:0}
  .section-head{align-items:flex-start;flex-direction:column}
  .catalog-row{grid-template-columns:52px 1fr 32px;gap:14px}
  .catalog-cover{display:none}
  .catalog-no{font-size:1.7rem}
  .footer-grid{grid-template-columns:1fr 1fr}
  .updates-row{grid-template-columns:44px 1fr;gap:16px}
  .up-side{grid-column:2;justify-content:flex-start}
}
@media(max-width:760px){
  body{font-size:15px}
  .section{padding:3rem 0}
  .feature-heading{min-height:0;padding:1.8rem}
  .feature-item{padding:1.3rem;min-height:auto}
  .featured-item{flex-wrap:wrap;padding:14px}
  .featured-arrow{display:none}
  .reco-small-grid{grid-template-columns:1fr 1fr;gap:14px}
  .reco-card{min-height:185px;padding:1rem}
  .save-panel{padding:1.8rem}
  .contact-info,.contact-form{padding:1.5rem}
  .input-row{grid-template-columns:1fr}
  .updates-wrap{padding:.4rem}
  .update-row{padding:1rem .8rem;grid-template-columns:1fr}
  .up-num{display:none}
  .up-side{justify-content:flex-start;margin-top:8px;flex-wrap:wrap}
  .footer-grid{grid-template-columns:1fr}
}
@media(max-width:520px){
  .hero{padding:3.4rem 0 3rem}
  .hero-actions .btn{width:100%}
  .nav-shell{overflow-x:auto;max-width:100%}
  .main-nav{gap:4px}
  .nav-item{padding:0.5rem .72rem;font-size:.86rem}
  .catalog-list{padding:4px}
  .catalog-row{grid-template-columns:1fr 28px;gap:10px;padding:16px 12px}
  .catalog-no{grid-column:1/2}
  .catalog-detail{grid-column:1/2}
  .catalog-go{display:none}
  .reco-small-grid{grid-template-columns:1fr}
  .featured-cover{width:92%}
  .save-panel{padding:1.4rem}
  .btn{padding-left:1.1rem;padding-right:1.1rem}
}

/* roulang page: category1 */
:root {
            --bg: #081120;
            --bg-2: #0C1830;
            --glass: rgba(17, 30, 52, 0.66);
            --glass-up: rgba(255, 255, 255, 0.055);
            --line: rgba(128, 184, 255, 0.16);
            --line-glow: rgba(82, 214, 245, 0.45);
            --text: #EDF5FF;
            --text-sub: #A3B7D2;
            --text-dim: #7891B2;
            --brand: #35C9E8;
            --brand-deep: #5A79FF;
            --accent: #FFBE5C;
            --accent-deep: #F79B3E;
            --grad-brand: linear-gradient(135deg, #35C9E8, #5A79FF);
            --grad-accent: linear-gradient(135deg, #FFBE5C, #F79B3E);
            --radius-xl: 22px;
            --radius-lg: 18px;
            --radius: 16px;
            --radius-sm: 10px;
            --shadow-card: 0 8px 24px rgba(2, 8, 23, 0.22);
            --shadow-raised: 0 16px 36px rgba(2, 8, 23, 0.34);
            --font-sans: "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", "Source Han Sans SC", sans-serif;
            --font-display: "Bahnschrift", "DIN Alternate", "Arial Narrow", "PingFang SC", sans-serif;
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        [hidden] {
            display: none !important;
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: var(--font-sans);
            background:
                radial-gradient(circle at 14% -8%, rgba(53, 201, 232, 0.14), transparent 34%),
                radial-gradient(circle at 92% 12%, rgba(90, 121, 255, 0.16), transparent 38%),
                var(--bg);
            color: var(--text);
            font-size: 16px;
            line-height: 1.8;
            min-height: 100vh;
            -webkit-font-smoothing: antialiased;
        }

        h1, h2, h3, h4, h5, h6 {
            color: var(--text);
            font-weight: 650;
            line-height: 1.35;
            letter-spacing: 0.01em;
        }

        p {
            margin: 0 0 1em;
        }

        img {
            display: block;
            max-width: 100%;
            height: auto;
        }

        a {
            color: inherit;
            text-decoration: none;
            transition: color 0.25s ease, background 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
        }

        ul, ol {
            list-style: none;
        }

        button, input, textarea, select {
            font-family: inherit;
            font-size: inherit;
            color: inherit;
        }

        ::selection {
            background: rgba(53, 201, 232, 0.28);
            color: #fff;
        }

        a:focus-visible,
        button:focus-visible,
        input:focus-visible,
        textarea:focus-visible,
        summary:focus-visible {
            outline: 2px solid var(--accent);
            outline-offset: 3px;
            border-radius: 6px;
        }

        .grid-container {
            max-width: 1220px;
            padding-left: 24px;
            padding-right: 24px;
        }

        .grid-margin-x {
            margin-left: -12px;
            margin-right: -12px;
        }

        .grid-margin-x > .cell {
            padding-left: 12px;
            padding-right: 12px;
        }

        .grid-x {
            display: flex;
            flex-flow: row wrap;
        }

        .cell {
            min-width: 0;
        }

        .glass-card {
            background: var(--glass);
            border: 1px solid var(--line);
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-card);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
        }

        .site-header {
            position: sticky;
            top: 0;
            z-index: 90;
            padding: 14px 0 0;
            background: transparent;
        }

        .nav-shell {
            display: flex;
            align-items: center;
            gap: 16px;
            min-height: 62px;
            padding: 8px 10px 8px 18px;
            border-radius: 20px;
            background: linear-gradient(180deg, rgba(13, 24, 44, 0.92), rgba(8, 16, 32, 0.88));
            border: 1px solid rgba(128, 184, 255, 0.18);
            box-shadow: 0 12px 30px rgba(2, 8, 23, 0.34), inset 0 1px rgba(255, 255, 255, 0.05);
            backdrop-filter: blur(18px);
            -webkit-backdrop-filter: blur(18px);
        }

        .brand {
            display: inline-flex;
            align-items: center;
            flex: 0 0 auto;
            padding: 6px 7px;
            border-radius: 12px;
            font-weight: 700;
        }

        .brand-mark {
            font-family: var(--font-display);
            font-size: 1.5rem;
            letter-spacing: -0.02em;
            line-height: 1;
            white-space: nowrap;
        }

        .brand-mark .brand-j {
            color: var(--text);
        }

        .brand-mark .brand-nine {
            color: var(--accent);
            text-shadow: 0 0 16px rgba(255, 190, 92, 0.36);
            display: inline-block;
            transform: translateY(-1px);
        }

        .brand-mark .brand-domain {
            color: var(--brand);
        }

        .main-nav {
            display: flex;
            align-items: center;
            gap: 8px;
            margin-left: auto;
            padding: 3px;
            overflow-x: auto;
            scrollbar-width: none;
            -webkit-overflow-scrolling: touch;
        }

        .main-nav::-webkit-scrollbar {
            display: none;
        }

        .nav-item {
            flex: 0 0 auto;
            position: relative;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 9px 15px;
            border-radius: 12px;
            font-weight: 500;
            font-size: 0.95rem;
            color: var(--text-sub);
            border: 1px solid transparent;
            transition: background 0.25s ease, color 0.25s ease, border-color 0.25s ease;
        }

        .nav-item:hover {
            color: var(--text);
            background: rgba(255, 255, 255, 0.055);
            border-color: rgba(128, 184, 255, 0.1);
        }

        .nav-item.is-active {
            background: rgba(53, 201, 232, 0.15);
            border-color: rgba(53, 201, 232, 0.28);
            color: #D7F8FF;
            box-shadow: 0 0 16px rgba(53, 201, 232, 0.1), inset 0 1px rgba(255, 255, 255, 0.04);
        }

        .nav-item.is-active::after {
            content: "";
            position: absolute;
            left: 14px;
            right: 14px;
            bottom: 3px;
            height: 2px;
            border-radius: 2px;
            background: var(--grad-brand);
            opacity: 0.9;
        }

        .nav-cta {
            flex: 0 0 auto;
            white-space: nowrap;
        }

        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 10px 18px;
            border-radius: 12px;
            font-weight: 600;
            font-size: 0.95rem;
            line-height: 1.4;
            cursor: pointer;
            transition: transform 0.2s ease, box-shadow 0.25s ease, filter 0.25s ease, background 0.25s ease;
            border: 1px solid transparent;
        }

        .btn-primary {
            background: var(--grad-brand);
            color: #071421;
            box-shadow: 0 8px 22px rgba(53, 201, 232, 0.28);
        }

        .btn-primary:hover {
            filter: brightness(1.06);
            transform: translateY(-2px);
            box-shadow: 0 12px 28px rgba(53, 201, 232, 0.36);
            color: #071421;
        }

        .btn-primary:active {
            transform: translateY(0) scale(0.98);
        }

        .btn-ghost {
            background: rgba(255, 255, 255, 0.04);
            border-color: rgba(128, 184, 255, 0.26);
            color: var(--text);
        }

        .btn-ghost:hover {
            background: rgba(255, 255, 255, 0.08);
            border-color: var(--line-glow);
            color: var(--text);
            transform: translateY(-2px);
        }

        .btn-ghost:active {
            transform: scale(0.98);
        }

        .btn-sm {
            padding: 8px 14px;
            font-size: 0.9rem;
            border-radius: 11px;
        }

        .cat-hero {
            position: relative;
            padding: 78px 0 64px;
            border-bottom: 1px solid rgba(128, 184, 255, 0.12);
            background:
                linear-gradient(105deg, rgba(4, 10, 20, 0.97) 6%, rgba(8, 19, 38, 0.88) 44%, rgba(12, 28, 51, 0.68) 82%),
                url('/assets/images/backpic/back-2.webp') center/cover no-repeat;
            overflow: hidden;
        }

        .cat-hero::before {
            content: "";
            position: absolute;
            inset: 0;
            pointer-events: none;
            background-image:
                linear-gradient(rgba(125, 155, 190, 0.06) 1px, transparent 1px),
                linear-gradient(90deg, rgba(125, 155, 190, 0.06) 1px, transparent 1px);
            background-size: 46px 46px;
            mask-image: linear-gradient(180deg, #000, transparent 75%);
            -webkit-mask-image: linear-gradient(180deg, #000, transparent 75%);
        }

        .cat-hero .grid-container {
            position: relative;
            z-index: 1;
        }

        .crumb {
            display: inline-flex;
            align-items: center;
            flex-wrap: wrap;
            gap: 8px;
            padding: 7px 13px;
            border-radius: 999px;
            background: rgba(255, 255, 255, 0.035);
            border: 1px solid rgba(128, 184, 255, 0.14);
            font-size: 0.85rem;
            color: var(--text-dim);
        }

        .crumb a:hover {
            color: var(--brand);
        }

        .crumb-sep {
            color: rgba(255, 255, 255, 0.25);
        }

        .crumb-current {
            color: var(--text-sub);
        }

        .hero-main-title {
            margin-top: 26px;
            max-width: 930px;
            font-size: clamp(2.05rem, 4.6vw, 3.35rem);
            font-weight: 700;
            line-height: 1.25;
            color: var(--text);
            letter-spacing: 0.01em;
        }

        .hero-main-title span {
            color: var(--accent);
        }

        .hero-lead {
            margin-top: 20px;
            max-width: 780px;
            color: var(--text-sub);
            font-size: 1.08rem;
            line-height: 1.9;
        }

        .hero-note-strip {
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
            margin-top: 30px;
            padding: 14px 18px;
            border-radius: 16px;
            background: rgba(255, 255, 255, 0.05);
            border: 1px solid rgba(128, 184, 255, 0.15);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            max-width: 860px;
        }

        .hero-note-item {
            display: inline-flex;
            align-items: center;
            gap: 7px;
            color: var(--text-sub);
            font-size: 0.88rem;
        }

        .hero-note-item svg {
            width: 17px;
            height: 17px;
            stroke: var(--brand);
            flex: 0 0 auto;
        }

        .cat-layout {
            padding: 60px 0 72px;
        }

        .cat-toc-cell {
            min-width: 0;
        }

        .cat-content-cell {
            min-width: 0;
        }

        .toc-card {
            padding: 18px 14px 20px;
            position: sticky;
            top: 104px;
        }

        .toc-head {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 6px 8px 12px;
        }

        .toc-head h2 {
            font-size: 1.05rem;
            font-weight: 700;
            color: var(--text);
        }

        .toc-head .toc-count {
            color: var(--accent);
            font-family: var(--font-display);
            font-size: 0.75rem;
            letter-spacing: 0.08em;
        }

        .toc-list {
            display: flex;
            flex-direction: column;
            gap: 3px;
        }

        .toc-list a {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 10px;
            padding: 10px 11px;
            border-radius: 10px;
            color: var(--text-sub);
            border: 1px solid transparent;
            font-size: 0.9rem;
        }

        .toc-list a em {
            font-style: normal;
            color: var(--text-dim);
            transition: transform 0.2s ease, color 0.2s ease;
        }

        .toc-list a:hover {
            color: var(--text);
            background: rgba(255, 255, 255, 0.04);
            border-color: rgba(128, 184, 255, 0.13);
        }

        .toc-list a:hover em {
            color: var(--brand);
            transform: translateX(3px);
        }

        .doc-stack {
            display: flex;
            flex-direction: column;
            gap: 26px;
        }

        .section-block {
            padding: 36px 36px 34px;
            border-radius: var(--radius-xl);
            background: var(--glass);
            border: 1px solid var(--line);
            box-shadow: var(--shadow-card);
            backdrop-filter: blur(14px);
            -webkit-backdrop-filter: blur(14px);
            scroll-margin-top: 120px;
        }

        .block-kicker {
            display: flex;
            align-items: center;
            gap: 8px;
            color: var(--brand);
            font-size: 0.82rem;
            font-weight: 700;
            letter-spacing: 0.12em;
            margin-bottom: 8px;
        }

        .block-kicker::before {
            content: "";
            width: 22px;
            height: 2px;
            border-radius: 4px;
            background: var(--grad-brand);
        }

        .block-title {
            margin-bottom: 14px;
            font-size: clamp(1.45rem, 2.2vw, 1.9rem);
            font-weight: 700;
            line-height: 1.35;
        }

        .block-lead {
            max-width: 860px;
            margin-bottom: 18px;
            color: var(--text-sub);
            font-size: 1.03rem;
        }

        .text-copy {
            color: var(--text-sub);
            max-width: 900px;
        }

        .text-copy strong {
            color: var(--text);
            font-weight: 650;
        }

        .tag-list {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            margin-top: 18px;
        }

        .tag {
            display: inline-flex;
            align-items: center;
            padding: 6px 13px;
            border-radius: 999px;
            font-size: 0.85rem;
            color: #C7DAEE;
            background: rgba(255, 255, 255, 0.04);
            border: 1px solid rgba(128, 184, 255, 0.18);
        }

        .tag::before {
            content: "";
            width: 5px;
            height: 5px;
            border-radius: 50%;
            margin-right: 8px;
            background: var(--brand);
            box-shadow: 0 0 10px rgba(53, 201, 232, 0.6);
        }

        .signal-list {
            display: flex;
            flex-direction: column;
            gap: 14px;
            margin-top: 24px;
        }

        .signal-row {
            display: grid;
            grid-template-columns: 52px 1fr;
            gap: 16px;
            padding: 20px 22px;
            border-radius: 16px;
            background: rgba(255, 255, 255, 0.035);
            border: 1px solid rgba(128, 184, 255, 0.13);
            transition: background 0.25s ease, border-color 0.25s ease, transform 0.25s ease;
        }

        .signal-row:hover {
            background: rgba(255, 255, 255, 0.055);
            border-color: rgba(82, 214, 245, 0.36);
            transform: translateY(-2px);
        }

        .signal-num {
            font-family: var(--font-display);
            color: var(--accent);
            font-size: 1.1rem;
            line-height: 1.5;
            padding-top: 2px;
        }

        .signal-text h3 {
            font-size: 1.1rem;
            font-weight: 650;
            margin-bottom: 6px;
            color: var(--text);
        }

        .signal-text p {
            color: var(--text-sub);
            font-size: 0.98rem;
            line-height: 1.85;
            margin: 0;
        }

        .path-list {
            margin-top: 24px;
            display: flex;
            flex-direction: column;
        }

        .path-step {
            display: grid;
            grid-template-columns: 48px 1fr;
            gap: 16px;
            padding: 18px 0;
            border-bottom: 1px solid rgba(128, 184, 255, 0.13);
        }

        .path-step:first-child {
            padding-top: 4px;
        }

        .path-step:last-child {
            border-bottom: none;
            padding-bottom: 4px;
        }

        .step-num {
            width: 46px;
            height: 46px;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: 14px;
            font-family: var(--font-display);
            font-weight: 700;
            color: var(--accent);
            background: rgba(255, 190, 92, 0.1);
            border: 1px solid rgba(255, 190, 92, 0.2);
        }

        .step-copy h3 {
            font-size: 1.08rem;
            margin-bottom: 5px;
        }

        .step-copy p {
            color: var(--text-sub);
            margin: 0;
            max-width: 610px;
        }

        .topic-list {
            margin-top: 24px;
            display: flex;
            flex-direction: column;
            gap: 20px;
        }

        .topic-feature {
            display: grid;
            grid-template-columns: 1fr 1.25fr;
            gap: 0;
            border-radius: 18px;
            overflow: hidden;
            background: rgba(255, 255, 255, 0.04);
            border: 1px solid rgba(128, 184, 255, 0.13);
            transition: transform 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
        }

        .topic-feature:hover {
            transform: translateY(-2px);
            border-color: rgba(82, 214, 245, 0.38);
            box-shadow: var(--shadow-raised);
        }

        .topic-media {
            overflow: hidden;
            background: #102036;
            aspect-ratio: 4/3;
            min-height: 100%;
        }

        .topic-media img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        .topic-feature .topic-media {
            aspect-ratio: auto;
        }

        .topic-feature-body {
            padding: 28px 28px 24px;
        }

        .topic-feature-body h3,
        .topic-card-body h3 {
            font-size: 1.08rem;
            margin-bottom: 8px;
        }

        .topic-feature-body p,
        .topic-card-body p {
            color: var(--text-sub);
            font-size: 0.96rem;
            line-height: 1.85;
            margin: 0;
        }

        .topic-pair {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 16px;
        }

        .topic-card {
            display: flex;
            flex-direction: column;
            border-radius: 18px;
            overflow: hidden;
            background: rgba(255, 255, 255, 0.04);
            border: 1px solid rgba(128, 184, 255, 0.13);
            transition: transform 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
        }

        .topic-card:hover {
            transform: translateY(-3px);
            border-color: rgba(82, 214, 245, 0.36);
            box-shadow: var(--shadow-raised);
        }

        .topic-card .topic-media {
            aspect-ratio: 4/2.8;
            flex: 0 0 auto;
        }

        .topic-card-body {
            padding: 20px 20px 22px;
        }

        .faq-list {
            display: flex;
            flex-direction: column;
            gap: 14px;
            margin-top: 22px;
        }

        .faq-card {
            border-radius: 16px;
            background: rgba(255, 255, 255, 0.035);
            border: 1px solid rgba(128, 184, 255, 0.13);
            transition: border-color 0.25s ease, background 0.25s ease, box-shadow 0.25s ease;
        }

        .faq-card[open] {
            border-color: rgba(53, 201, 232, 0.5);
            background: rgba(255, 255, 255, 0.05);
            box-shadow: 0 0 22px rgba(53, 201, 232, 0.08);
        }

        .faq-card summary {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            padding: 17px 20px;
            cursor: pointer;
            list-style: none;
            font-weight: 600;
            font-size: 1rem;
            color: var(--text);
        }

        .faq-card summary::-webkit-details-marker {
            display: none;
        }

        .faq-card summary::after {
            content: "+";
            font-family: var(--font-display);
            font-size: 1.25rem;
            font-weight: 500;
            color: var(--accent);
            line-height: 1;
            background: rgba(255, 190, 92, 0.12);
            border-radius: 9px;
            width: 30px;
            height: 30px;
            display: flex;
            align-items: center;
            justify-content: center;
            flex: 0 0 auto;
        }

        .faq-card[open] summary::after {
            content: "−";
        }

        .faq-card summary:hover {
            background: rgba(255, 255, 255, 0.03);
        }

        .faq-card .faq-body {
            padding: 0 22px 22px;
            color: var(--text-sub);
            max-width: 920px;
        }

        .faq-card .faq-body p {
            margin: 0;
            line-height: 1.85;
        }

        .contact-panel {
            background:
                radial-gradient(circle at 80% 0%, rgba(53, 201, 232, 0.1), transparent 42%),
                linear-gradient(135deg, rgba(17, 30, 52, 0.84), rgba(10, 20, 38, 0.86)),
                var(--glass);
            border: 1px solid rgba(128, 184, 255, 0.2);
            border-radius: var(--radius-xl);
            box-shadow: var(--shadow-card);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            overflow: hidden;
        }

        .contact-panel .contact-copy {
            padding: 38px 8px 20px 0;
        }

        .contact-copy .contact-brandline {
            color: var(--accent);
            font-weight: 650;
            margin-bottom: 8px;
            display: inline-flex;
            align-items: center;
            gap: 8px;
        }

        .contact-copy .contact-brandline::before {
            content: "";
            width: 30px;
            height: 2px;
            background: var(--grad-accent);
            border-radius: 4px;
        }

        .contact-copy h2 {
            font-size: clamp(1.5rem, 2.4vw, 2rem);
            margin-bottom: 12px;
        }

        .contact-copy p {
            color: var(--text-sub);
            max-width: 560px;
            margin-bottom: 22px;
        }

        .contact-form-card {
            padding: 26px 26px 24px;
            border-radius: 18px;
            background: rgba(255, 255, 255, 0.05);
            border: 1px solid rgba(128, 184, 255, 0.13);
        }

        .form-grid {
            display: flex;
            flex-direction: column;
            gap: 16px;
        }

        .form-row {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 14px;
        }

        .field-label {
            display: block;
            font-size: 0.85rem;
            font-weight: 600;
            color: var(--text-sub);
            margin-bottom: 7px;
            letter-spacing: 0.02em;
        }

        .field-input,
        .field-textarea {
            width: 100%;
            border-radius: 12px;
            border: 1px solid rgba(128, 184, 255, 0.18);
            background: rgba(4, 12, 26, 0.48);
            padding: 11px 14px;
            color: var(--text);
            transition: border-color 0.25s ease, box-shadow 0.25s ease, background 0.25s ease;
        }

        .field-input::placeholder,
        .field-textarea::placeholder {
            color: var(--text-dim);
            opacity: 0.82;
        }

        .field-input:focus,
        .field-textarea:focus {
            border-color: var(--brand);
            background: rgba(4, 12, 26, 0.62);
            box-shadow: 0 0 0 3px rgba(53, 201, 232, 0.12);
            outline: none;
        }

        .field-textarea {
            resize: vertical;
            min-height: 110px;
        }

        .form-notice {
            margin-top: 14px;
            padding: 10px 14px;
            border-radius: 12px;
            background: rgba(53, 201, 232, 0.08);
            border: 1px solid rgba(53, 201, 232, 0.24);
            color: #D7F8FF;
            font-size: 0.9rem;
        }

        .site-footer {
            background:
                radial-gradient(circle at 15% 0%, rgba(53, 201, 232, 0.08), transparent 28%),
                #060D19;
            border-top: 1px solid rgba(128, 184, 255, 0.12);
            margin-top: 40px;
        }

        .site-footer .footer-top {
            padding: 56px 0 42px;
            border-bottom: 1px solid rgba(128, 184, 255, 0.1);
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 1.65fr 1fr 1fr 1fr;
            gap: 36px;
        }

        .footer-about .footer-brand {
            display: inline-flex;
            margin-bottom: 14px;
        }

        .footer-about p {
            color: var(--text-dim);
            font-size: 0.96rem;
            max-width: 340px;
            line-height: 1.85;
            margin: 0;
        }

        .footer-column h4 {
            font-size: 1rem;
            margin-bottom: 12px;
            color: var(--text);
            font-weight: 650;
        }

        .footer-column ul li + li {
            margin-top: 8px;
        }

        .footer-column ul a {
            color: var(--text-dim);
            font-size: 0.93rem;
            transition: color 0.25s ease, padding-left 0.25s ease;
        }

        .footer-column ul a:hover {
            color: var(--brand);
            padding-left: 3px;
        }

        .footer-bottom {
            padding: 22px 0 30px;
        }

        .footer-bottom-inner {
            display: flex;
            flex-wrap: wrap;
            gap: 14px;
            align-items: center;
            justify-content: space-between;
        }

        .footer-bottom p {
            margin: 0;
            color: var(--text-dim);
            font-size: 0.86rem;
        }

        .footer-bottom p a {
            color: var(--text-sub);
        }

        .footer-bottom p a:hover {
            color: var(--brand);
        }

        @media screen and (min-width: 64em) {
            .cat-toc-cell {
                flex: 0 0 25%;
                max-width: 25%;
            }

            .cat-content-cell {
                flex: 0 0 75%;
                max-width: 75%;
            }
        }

        @media screen and (max-width: 63.99em) {
            .cat-layout .grid-x {
                display: block;
            }

            .cat-toc-cell,
            .cat-content-cell {
                width: 100%;
                max-width: 100%;
                flex: none;
            }

            .toc-card {
                position: relative;
                top: auto;
                margin: 0 0 26px;
            }
        }

        @media screen and (max-width: 1023px) {
            .footer-grid {
                grid-template-columns: 1.4fr 1fr 1fr;
                gap: 28px;
            }

            .footer-about {
                grid-column: span 3;
                max-width: 640px;
            }
        }

        @media screen and (max-width: 900px) {
            .nav-shell {
                flex-wrap: wrap;
                gap: 10px;
                padding: 12px 12px 10px;
            }

            .main-nav {
                order: 3;
                width: 100%;
                margin-left: 0;
                justify-content: flex-start;
                padding-top: 2px;
            }

            .nav-cta {
                margin-left: auto;
            }

            .cat-hero {
                padding: 58px 0 48px;
            }

            .section-block {
                padding: 26px 22px 24px;
            }

            .contact-panel .contact-copy {
                padding: 22px 0 28px;
            }
        }

        @media screen and (max-width: 767px) {
            .grid-container {
                padding-left: 18px;
                padding-right: 18px;
            }

            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 20px;
            }

            .footer-about {
                grid-column: span 2;
            }

            .topic-feature {
                grid-template-columns: 1fr;
            }

            .topic-feature .topic-media {
                aspect-ratio: 4/2.6;
                min-height: 0;
            }

            .topic-pair {
                grid-template-columns: 1fr;
            }

            .form-row {
                grid-template-columns: 1fr;
            }

            .footer-bottom-inner {
                flex-direction: column;
                justify-content: flex-start;
                align-items: flex-start;
            }

            .cat-layout {
                padding: 40px 0 58px;
            }

            .path-step {
                grid-template-columns: 40px 1fr;
            }

            .step-num {
                width: 40px;
                height: 40px;
                border-radius: 11px;
            }
        }

        @media screen and (max-width: 520px) {
            .site-header {
                padding: 8px 0 0;
            }

            .nav-shell {
                border-radius: 16px;
                padding: 10px;
            }

            .brand-mark {
                font-size: 1.25rem;
            }

            .nav-item {
                padding: 9px 12px;
                font-size: 0.88rem;
            }

            .cat-hero h1 {
                font-size: 1.85rem;
            }

            .hero-note-strip {
                padding: 12px 13px;
                gap: 8px;
            }

            .signal-row {
                grid-template-columns: 1fr;
                padding: 18px;
            }

            .signal-num {
                font-size: 0.95rem;
            }

            .topic-feature-body,
            .topic-card-body {
                padding: 18px;
            }

            .contact-form-card {
                padding: 20px;
            }

            .footer-grid {
                grid-template-columns: 1fr;
            }

            .footer-about {
                grid-column: span 1;
            }
        }

/* roulang page: article */
:root {
  --bg-main: #081120;
  --bg-secondary: #0C1830;
  --glass-bg: rgba(17, 30, 52, 0.64);
  --glass-light: rgba(255, 255, 255, 0.055);
  --border-card: rgba(128, 184, 255, 0.16);
  --border-glow: rgba(82, 214, 245, 0.45);
  --text-main: #EDF5FF;
  --text-secondary: #A3B7D2;
  --text-muted: #7891B2;
  --brand-cyan: #35C9E8;
  --brand-blue: #5A79FF;
  --amber: #FFBE5C;
  --grad-cyan-blue: linear-gradient(135deg, #35C9E8, #5A79FF);
  --grad-amber: linear-gradient(135deg, #FFBE5C, #F79B3E);
  --radius-lg: 20px;
  --radius-md: 16px;
  --radius-sm: 10px;
  --radius-pill: 999px;
  --shadow-card: 0 8px 24px rgba(2, 8, 23, 0.22);
  --shadow-hover: 0 16px 36px rgba(2, 8, 23, 0.34);
  --container-max: 1200px;
  --section-gap: clamp(48px, 6vw, 96px);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", "Source Han Sans SC", sans-serif;
  background-color: var(--bg-main);
  background-image: radial-gradient(ellipse 50% 30% at 70% 10%, rgba(90, 121, 255, 0.08), transparent),
                    radial-gradient(ellipse 40% 25% at 5% 50%, rgba(53, 201, 232, 0.05), transparent);
  color: var(--text-main);
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
}

img { max-width: 100%; display: block; }
a { color: var(--brand-cyan); text-decoration: none; transition: color .2s ease, opacity .2s ease; }
a:hover { color: var(--amber); }
button, input, select, textarea { font-family: inherit; }
:focus-visible { outline: 2px solid var(--amber); outline-offset: 2px; border-radius: 4px; }

.grid-container {
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: 20px;
  padding-right: 20px;
}

.main-wrap { min-height: 60vh; }

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 0.95rem;
  font-weight: 600;
  padding: 12px 22px;
  border-radius: var(--radius-sm);
  border: none;
  cursor: pointer;
  transition: transform .2s ease, box-shadow .25s ease, filter .2s ease, border-color .2s ease;
  line-height: 1.4;
  letter-spacing: .02em;
  white-space: nowrap;
}
.btn-sm { padding: 8px 18px; font-size: 0.875rem; }
.btn-primary {
  background: var(--grad-cyan-blue);
  color: #fff;
  box-shadow: 0 6px 20px rgba(53, 201, 232, 0.28);
}
.btn-primary:hover {
  color: #fff;
  filter: brightness(1.08);
  transform: translateY(-2px);
  box-shadow: 0 10px 28px rgba(53, 201, 232, 0.42);
}
.btn-primary:active { transform: translateY(0) scale(0.98); filter: brightness(0.98); }
.btn-ghost {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(128, 184, 255, 0.3);
  color: var(--text-main);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}
.btn-ghost:hover { border-color: var(--border-glow); color: var(--brand-cyan); transform: translateY(-2px); }
.btn-ghost:active { transform: translateY(0) scale(0.98); }
.btn-amber {
  background: var(--grad-amber);
  color: #101828;
  box-shadow: 0 6px 20px rgba(255, 190, 92, 0.22);
}
.btn-amber:hover { filter: brightness(1.07); transform: translateY(-2px); color: #101828; box-shadow: 0 10px 26px rgba(255, 190, 92, 0.36); }
.btn-amber:active { transform: translateY(0) scale(0.98); }

/* ===== Header / Nav ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  padding: 14px 0 6px;
}
.nav-shell {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 18px;
  background: rgba(8, 17, 32, 0.78);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid rgba(128, 184, 255, 0.12);
  border-radius: var(--radius-md);
  box-shadow: 0 10px 32px rgba(0, 0, 0, 0.3);
}
.brand {
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
}
.brand-mark {
  display: inline-flex;
  align-items: center;
  font-family: "Bahnschrift", "DIN Alternate", "Arial Narrow", sans-serif;
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}
.brand-j { color: var(--text-main); }
.brand-nine {
  color: var(--amber);
  font-size: 1.45rem;
  line-height: 1;
  text-shadow: 0 0 16px rgba(255, 190, 92, 0.4);
}
.brand-domain {
  color: var(--brand-cyan);
  font-size: 0.95rem;
  font-weight: 500;
  margin-left: 2px;
}
.main-nav {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-left: auto;
  overflow-x: auto;
  scrollbar-width: none;
}
.main-nav::-webkit-scrollbar { display: none; }
.nav-item {
  display: inline-flex;
  align-items: center;
  padding: 9px 14px;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-size: 0.92rem;
  font-weight: 500;
  border: 1px solid transparent;
  white-space: nowrap;
  transition: background .2s ease, border-color .2s ease, color .2s ease, box-shadow .2s ease;
}
.nav-item:hover {
  color: var(--text-main);
  background: rgba(255, 255, 255, 0.05);
  border-color: rgba(128, 184, 255, 0.1);
}
.nav-item.is-active {
  background: rgba(53, 201, 232, 0.1);
  border-color: rgba(53, 201, 232, 0.25);
  color: var(--brand-cyan);
  box-shadow: inset 0 0 10px rgba(53, 201, 232, 0.1);
  position: relative;
}
.nav-item.is-active::after {
  content: "";
  position: absolute;
  left: 14px;
  right: 14px;
  bottom: 3px;
  height: 2px;
  background: var(--grad-cyan-blue);
  border-radius: 2px;
}
.nav-cta { margin-left: 4px; flex-shrink: 0; }

/* ===== Article Page ===== */
.article-hero {
  position: relative;
  border-radius: 0 0 var(--radius-lg) var(--radius-lg);
  overflow: hidden;
  padding: clamp(36px, 5vw, 64px) 0 clamp(34px, 4vw, 56px);
}
.article-hero-bg {
  position: absolute;
  inset: 0;
  background-image: url("/assets/images/backpic/back-2.webp");
  background-size: cover;
  background-position: center;
  z-index: 0;
}
.article-hero-bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(8, 17, 32, 0.88) 0%, rgba(8, 17, 32, 0.76) 40%, var(--bg-main) 100%);
}
.article-hero-inner {
  position: relative;
  z-index: 1;
  max-width: 860px;
  margin: 0 auto;
  padding: 0 20px;
}
.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 20px;
}
.breadcrumb a { color: var(--text-secondary); transition: color .2s ease; }
.breadcrumb a:hover { color: var(--brand-cyan); }
.breadcrumb .sep { opacity: .5; }
.article-hero .breadcrumb .crumb-current { color: var(--brand-cyan); font-weight: 500; }
.article-hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 16px;
  background: rgba(53, 201, 232, 0.12);
  border: 1px solid rgba(53, 201, 232, 0.25);
  padding: 6px 14px;
  border-radius: var(--radius-pill);
  font-size: 0.82rem;
  color: var(--brand-cyan);
  font-weight: 500;
}
.article-hero-tag::before {
  content: "";
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--brand-cyan);
  box-shadow: 0 0 8px rgba(53, 201, 232, 0.7);
  flex-shrink: 0;
}
.article-title-wrap { margin-bottom: 18px; }
.article-title-wrap h1 {
  font-size: clamp(1.65rem, 3.6vw, 2.45rem);
  font-weight: 700;
  line-height: 1.4;
  color: var(--text-main);
  letter-spacing: .01em;
  word-break: break-word;
  margin-bottom: 18px;
}
.article-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 24px;
  font-size: 0.87rem;
  color: var(--text-muted);
}
.article-meta-item {
  display: inline-flex;
  align-items: center;
  gap: 7px;
}
.article-meta-item svg { width: 15px; height: 15px; opacity: .7; }

.article-category-chip {
  display: inline-flex;
  align-items: center;
  padding: 4px 13px;
  background: rgba(90, 121, 255, 0.14);
  border: 1px solid rgba(90, 121, 255, 0.32);
  border-radius: var(--radius-pill);
  font-size: 0.8rem;
  color: #A7B5FF;
  font-weight: 500;
  margin-left: 2px;
}

.article-body-layout {
  padding: clamp(28px, 4vw, 52px) 0 var(--section-gap);
}
.article-reader {
  max-width: 860px;
  margin: 0 auto;
  padding: 0 20px;
}
.article-feature-image {
  border-radius: var(--radius-lg);
  overflow: hidden;
  margin-bottom: 40px;
  border: 1px solid var(--border-card);
  box-shadow: var(--shadow-card);
  aspect-ratio: 16 / 9;
  background: rgba(12, 24, 48, 0.6);
}
.article-feature-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.article-content {
  color: var(--text-secondary);
  font-size: 1.05rem;
  line-height: 1.95;
}
.article-content p { margin-bottom: 1.5em; }
.article-content h2, .article-content h3 { color: var(--text-main); font-weight: 650; margin-top: 1.6em; margin-bottom: 0.8em; line-height: 1.4; letter-spacing: .01em; }
.article-content h2 { font-size: clamp(1.2rem, 2.2vw, 1.55rem); }
.article-content h3 { font-size: clamp(1.05rem, 1.8vw, 1.25rem); }
.article-content h2::before { content: ""; display: inline-block; width: 4px; height: 0.9em; background: var(--grad-cyan-blue); border-radius: 4px; margin-right: 10px; vertical-align: middle; }
.article-content h3::before { content: ""; display: inline-block; width: 3px; height: 0.8em; background: var(--brand-cyan); border-radius: 4px; margin-right: 10px; opacity: .7; vertical-align: middle; }
.article-content ul, .article-content ol { margin-bottom: 1.5em; padding-left: 1.4em; }
.article-content li { margin-bottom: 0.55em; }
.article-content li::marker { color: var(--brand-cyan); }
.article-content blockquote {
  border-left: 4px solid var(--brand-cyan);
  background: rgba(53, 201, 232, 0.07);
  padding: 16px 22px;
  margin: 1.8em 0;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--text-main);
  font-style: normal;
}
.article-content blockquote p { margin-bottom: 0; }
.article-content img {
  border-radius: var(--radius-md);
  margin: 1.8em 0;
  border: 1px solid var(--border-card);
}
.article-content figure { margin: 1.8em 0; }
.article-content figcaption {
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 10px;
}
.article-content a { text-decoration: underline; text-underline-offset: 3px; }
.article-content code {
  background: rgba(53, 201, 232, 0.1);
  color: var(--brand-cyan);
  border-radius: 6px;
  padding: 2px 7px;
  font-family: "Bahnschrift", Consolas, monospace;
  font-size: 0.9em;
}

.article-missing {
  padding: 60px 24px;
  text-align: center;
}
.missing-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 20px;
  background: rgba(53, 201, 232, 0.08);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--brand-cyan);
  font-size: 26px;
  border: 1px solid rgba(53, 201, 232, 0.2);
}
.article-missing h2 { font-size: 1.35rem; color: var(--text-main); margin-bottom: 12px; }
.article-missing p { color: var(--text-secondary); margin-bottom: 24px; max-width: 440px; margin-left: auto; margin-right: auto; }

/* ===== Article footer CTA ===== */
.article-toolbar {
  max-width: 860px;
  margin: 0 auto;
  padding: 28px 30px;
  background: var(--glass-bg);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-md);
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
}
.toolbar-label { font-size: 1rem; font-weight: 600; color: var(--text-main); margin-bottom: 4px; }
.toolbar-sub { font-size: 0.86rem; color: var(--text-muted); }
.toolbar-actions { display: flex; gap: 12px; flex-wrap: wrap; }

/* ===== Related cards ===== */
.related-section {
  padding: 0 0 var(--section-gap);
  max-width: 1200px;
  margin: 0 auto;
}
.related-section .sec-heading {
  margin-bottom: 28px;
  padding-left: 20px;
}
.related-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
  padding: 0 20px;
}
.related-grid .rel-item {
  flex: 1 1 calc(33.333% - 24px);
  min-width: 250px;
}
.rel-card {
  display: block;
  background: var(--glass-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: transform .25s ease, box-shadow .3s ease, border-color .25s ease;
  height: 100%;
}
.rel-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
  border-color: var(--border-glow);
}
.rel-img {
  position: relative;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: rgba(12, 24, 48, 0.7);
}
.rel-img img { width: 100%; height: 100%; object-fit: cover; transition: transform .4s ease; }
.rel-card:hover .rel-img img { transform: scale(1.03); }
.rel-img::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 55%, rgba(8, 17, 32, 0.6) 100%);
}
.rel-cover{
    width: 100%;
    height: 100%;
    object-fit: cover;
}
.rel-cat {
  position: absolute;
  top: 12px;
  left: 12px;
  z-index: 2;
  background: rgba(8, 17, 32, 0.7);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  padding: 4px 12px;
  border-radius: var(--radius-pill);
  font-size: 0.75rem;
  color: var(--brand-cyan);
  border: 1px solid rgba(82, 214, 245, 0.25);
}
.rel-body { padding: 18px 20px 20px; }
.rel-body h3 { font-size: 1.05rem; font-weight: 600; color: var(--text-main); line-height: 1.5; margin-bottom: 8px; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.rel-body p { font-size: 0.88rem; color: var(--text-secondary); line-height: 1.6; margin-bottom: 12px; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.rel-meta { font-size: 0.78rem; color: var(--text-muted); }

/* ===== CTA strip ===== */
.cta-strip {
  padding: calc(var(--section-gap) * 0.4) 0 calc(var(--section-gap) * 0.5);
}
.cta-strip .grid-container {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-lg);
  padding: clamp(32px, 5vw, 56px) clamp(24px, 4vw, 48px);
  background:
    radial-gradient(ellipse 60% 80% at 10% 0%, rgba(53, 201, 232, 0.1), transparent),
    radial-gradient(ellipse 40% 60% at 90% 100%, rgba(90, 121, 255, 0.13), transparent),
    rgba(12, 24, 48, 0.78);
  border: 1px solid rgba(53, 201, 232, 0.18);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
}
.cta-grid {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 26px;
}
.cta-left { flex: 1 1 360px; }
.cta-left h2 { font-size: clamp(1.3rem, 2.6vw, 1.9rem); font-weight: 700; margin-bottom: 12px; line-height: 1.4; color: var(--text-main); }
.cta-left p { color: var(--text-secondary); font-size: 0.95rem; max-width: 520px; margin-bottom: 0; line-height: 1.7; }
.cta-right { display: flex; gap: 12px; flex-wrap: wrap; align-items: center; }
.cta-share-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.92rem;
  padding: 10px 18px;
  background: rgba(255, 190, 92, 0.08);
  border: 1px solid rgba(255, 190, 92, 0.2);
  border-radius: var(--radius-sm);
  color: var(--amber);
  cursor: pointer;
  transition: all .2s ease;
}
.cta-share-btn:hover { background: rgba(255, 190, 92, 0.15); border-color: rgba(255, 190, 92, 0.45); color: var(--amber); }

/* ===== FAQ ===== */
.faq-section {
  padding: 0 0 var(--section-gap);
}
.faq-wrap { max-width: 860px; margin: 0 auto; padding: 0 20px; text-align: center; }
.faq-wrap h2 { font-size: clamp(1.4rem, 2.8vw, 2rem); margin-bottom: 16px; color: var(--text-main); atricle-title-wrap { } }
.faq-sec-label { font-size: 0.86rem; color: var(--brand-cyan); font-weight: 500; letter-spacing: 0.08em; margin-bottom: 10px; display: block; }
.faq-sub { color: var(--text-secondary); font-size: 0.94rem; margin-bottom: 32px; }
.faq-list { text-align: left; display: flex; flex-direction: column; gap: 12px; }
.faq-item {
  border: 1px solid var(--border-card);
  border-radius: var(--radius-md);
  background: var(--glass-bg);
  overflow: hidden;
  transition: border-color .25s ease, box-shadow .3s ease;
}
.faq-item[open], .faq-item.is-open { border-color: var(--border-glow); box-shadow: 0 8px 24px rgba(2, 8, 23, 0.2); }
.faq-question {
  width: 100%;
  background: transparent;
  border: none;
  text-align: left;
  padding: 20px 22px;
  color: var(--text-main);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  transition: color .2s ease;
}
.faq-question:hover { color: var(--brand-cyan); }
.faq-question::after {
  content: "";
  flex-shrink: 0;
  width: 12px;
  height: 12px;
  border-right: 2px solid var(--brand-cyan);
  border-bottom: 2px solid var(--brand-cyan);
  transform: rotate(45deg);
  transition: transform .3s ease, border-color .3s ease;
}
.faq-item.is-open .faq-question::after { transform: rotate(-135deg); }
.faq-answer { padding: 0 22px 22px; color: var(--text-secondary); font-size: 0.94rem; line-height: 1.85; }
.faq-answer p { margin-bottom: 1em; }
.faq-answer p:last-child { margin-bottom: 0; }

/* ===== Section titles ===== */
.sec-heading { padding: 0 20px; }
.sec-heading .sec-label { font-size: 0.86rem; color: var(--brand-cyan); font-weight: 600; letter-spacing: 0.06em; text-transform: uppercase; display: block; margin-bottom: 8px; }
.sec-heading h2 { font-size: clamp(1.4rem, 2.8vw, 2rem); color: var(--text-main); font-weight: 700; line-height: 1.3; letter-spacing: 0.01em; margin-bottom: 12px; }
.sec-heading p { color: var(--text-secondary); font-size: 0.95rem; max-width: 600px; }

/* ===== Footer ===== */
.site-footer {
  background: #050B17;
  border-top: 1px solid rgba(128, 184, 255, 0.08);
  margin-top: 20px;
  position: relative;
}
.site-footer::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(53, 201, 232, 0.6), transparent);
}
.footer-top { padding: clamp(36px, 5vw, 60px) 0 30px; }
.footer-grid {
  display: flex;
  flex-wrap: wrap;
  gap: clamp(24px, 3vw, 48px);
}
.footer-about { flex: 1 1 240px; max-width: 360px; }
.footer-column { flex: 1 1 140px; min-width: 130px; }
.footer-brand { display: inline-flex; align-items: center; margin-bottom: 16px; }
.footer-brand .brand-j { color: var(--text-main); }
.footer-brand .brand-nine { color: var(--amber); font-size: 1.4rem; }
.footer-brand .brand-domain { color: var(--brand-cyan); }
.footer-about p { color: var(--text-muted); font-size: 0.9rem; line-height: 1.8; }
.footer-column h4 { font-size: 0.95rem; color: var(--text-main); font-weight: 600; margin-bottom: 16px; position: relative; padding-bottom: 8px; }
.footer-column h4::after { content: ""; position: absolute; bottom: 0; left: 0; width: 24px; height: 2px; background: var(--grad-cyan-blue); border-radius: 2px; }
.footer-column ul { list-style: none; margin: 0; }
.footer-column ul li { margin-bottom: 10px; }
.footer-column ul a { color: var(--text-muted); font-size: 0.86rem; transition: color .2s ease, padding-left .25s ease; padding-left: 0; }
.footer-column ul a:hover { color: var(--brand-cyan); padding-left: 6px; }
.footer-bottom { border-top: 1px solid rgba(128, 184, 255, 0.07); padding: 18px 0; }
.footer-bottom-inner { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 10px; }
.footer-bottom-inner p { color: var(--text-muted); font-size: 0.82rem; margin-bottom: 0; }
.footer-bottom-inner p:last-child { text-align: right; }

/* ===== Empty states ===== */
.empty-panel {
  padding: 32px 20px;
  background: var(--glass-bg);
  border: 1px dashed rgba(128, 184, 255, 0.14);
  border-radius: var(--radius-md);
  text-align: center;
  color: var(--text-muted);
  font-size: 0.92rem;
  max-width: 860px;
  margin: 0 auto;
}
.empty-panel .empty-ico {
  width: 42px;
  height: 42px;
  margin: 0 auto 12px;
  background: rgba(53, 201, 232, 0.07);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
}
.empty-panel .empty-ico svg { width: 20px; height: 20px; color: var(--brand-cyan); }

/* ===== Foundation overrides ===== */
.grid-container { max-width: var(--container-max); }
.grid-container .grid-container { padding-left: 0; padding-right: 0; }
img { border: 0; }
hr { border-color: rgba(128, 184, 255, 0.1); }
::selection { background: rgba(53, 201, 232, 0.25); color: #fff; }

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .nav-shell { padding: 10px 14px; }
  .nav-item { padding: 8px 10px; font-size: 0.86rem; }
  .btn-sm { padding: 7px 14px; font-size: 0.82rem; }
  .related-grid .rel-item { flex: 1 1 calc(50% - 24px); }
}

@media (max-width: 768px) {
  body { font-size: 15px; }
  .nav-shell { flex-wrap: wrap; gap: 8px; padding: 10px 12px; }
  .brand { order: 1; }
  .nav-cta { order: 2; margin-left: auto; }
  .main-nav { order: 3; width: 100%; margin-left: 0; padding-top: 2px; gap: 4px; }
  .nav-item { flex: 0 0 auto; padding: 8px 12px; }
  .main-nav { justify-content: flex-start; overflow-x: auto; }
  .related-grid { gap: 16px; }
  .related-grid .rel-item { flex: 1 1 100%; min-width: 0; }
  .article-toolbar { flex-direction: column; align-items: flex-start; }
  .cta-grid { flex-direction: column; align-items: flex-start; }
  .article-content { font-size: 1rem; }
  .footer-grid { gap: 28px; }
  .footer-bottom-inner { flex-direction: column; align-items: flex-start; }
  .footer-bottom-inner p:last-child { text-align: left; }
  .article-meta { gap: 10px 16px; }
}

@media (max-width: 520px) {
  .grid-container { padding-left: 14px; padding-right: 14px; }
  .nav-shell { padding: 8px 10px; }
  .brand-mark { font-size: 1.1rem; }
  .brand-nine { font-size: 1.25rem; }
  .nav-item { font-size: 0.82rem; padding: 7px 10px; }
  .btn-sm { font-size: 0.8rem; padding: 6px 12px; }
  .nav-cta span.lg-text { display: none; }
  .article-hero { padding: 28px 0; }
  .breadcrumb { font-size: 0.78rem; }
  .article-title-wrap h1 { font-size: 1.45rem; line-height: 1.35; }
  .article-hero-tag { font-size: 0.76rem; padding: 4px 12px; }
  .article-body-layout { padding-top: 22px; }
  .article-reader { padding: 0 14px; }
  .article-feature-image { margin-bottom: 28px; }
  .article-content { font-size: 0.97rem; line-height: 1.85; }
  .article-content p { margin-bottom: 1.25em; }
  .article-toolbar { padding: 20px 18px; }
  .toolbar-actions { flex-direction: column; width: 100%; }
  .toolbar-actions .btn { width: 100%; }
  .cta-right { width: 100%; }
  .cta-right .btn { flex: 1; }
  .faq-question { padding: 16px 16px; font-size: 0.94rem; }
  .faq-answer { padding: 0 16px 18px; font-size: 0.92rem; }
  .sec-heading { padding: 0 14px; }
  .related-section .sec-heading { padding-left: 14px; }
}

/* roulang page: category2 */
:root {
  --bg-base: #081120;
  --bg-panel: #0C1830;
  --glass-bg: rgba(17, 30, 52, 0.64);
  --glass-light: rgba(255, 255, 255, 0.055);
  --line-card: rgba(128, 184, 255, 0.16);
  --line-glow: rgba(82, 214, 245, 0.45);
  --text-hero: #EDF5FF;
  --text-body: #C7D6E8;
  --text-sub: #A3B7D2;
  --text-mute: #7891B2;
  --blue: #35C9E8;
  --blue-deep: #5A79FF;
  --amber: #FFBE5C;
  --amber-deep: #F79B3E;
  --shadow-card: 0 8px 24px rgba(2, 8, 23, 0.22);
  --shadow-float: 0 16px 36px rgba(2, 8, 23, 0.34);
  --radius-outer: 22px;
  --radius-card: 16px;
  --radius-btn: 12px;
  --section-space: clamp(64px, 7vw, 100px);
  --font-cn: PingFang SC, Microsoft YaHei, Noto Sans CJK SC, Source Han Sans SC, sans-serif;
  --font-num: Bahnschrift, DIN Alternate, Arial Narrow, sans-serif;
}

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-cn);
  background:
    radial-gradient(circle at 18% 12%, rgba(53, 201, 232, 0.08), transparent 32%),
    radial-gradient(circle at 85% 32%, rgba(90, 121, 255, 0.06), transparent 26%),
    var(--bg-base);
  color: var(--text-hero);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

img {
  display: block;
  max-width: 100%;
  height: auto;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color 0.2s ease, border-color 0.2s ease, background-color 0.2s ease, box-shadow 0.2s ease, opacity 0.2s ease;
}

button,
input,
textarea {
  font-family: inherit;
  font-size: 1rem;
  color: inherit;
}

ul,
ol {
  list-style: none;
}

:focus-visible {
  outline: 2px solid var(--amber);
  outline-offset: 3px;
}

.grid-container {
  max-width: 1200px;
}

.site-main {
  min-height: 70vh;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 22px;
  border-radius: var(--radius-btn);
  font-size: 0.95rem;
  font-weight: 600;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease, filter 0.2s ease, background 0.2s ease, border-color 0.2s ease;
  text-align: center;
  line-height: 1.4;
  white-space: nowrap;
}

.btn:hover {
  transform: translateY(-2px);
}

.btn:active {
  transform: scale(0.98) translateY(0);
}

.btn-primary {
  background: linear-gradient(135deg, var(--blue), var(--blue-deep));
  color: #fff;
  box-shadow: 0 10px 28px rgba(53, 201, 232, 0.35);
}

.btn-primary:hover {
  filter: brightness(1.08);
  box-shadow: 0 12px 30px rgba(53, 201, 232, 0.42);
}

.btn-ghost {
  background: rgba(255, 255, 255, 0.04);
  border-color: var(--line-card);
  color: var(--text-hero);
  backdrop-filter: blur(6px);
}

.btn-ghost:hover {
  background: rgba(53, 201, 232, 0.1);
  border-color: var(--line-glow);
}

.btn-sm {
  padding: 8px 14px;
  font-size: 0.875rem;
  border-radius: 10px;
}

.btn-amber {
  background: linear-gradient(135deg, var(--amber), var(--amber-deep));
  color: #271303;
}

/* Header / Nav */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  padding: 10px 0 4px;
  background: rgba(7, 14, 27, 0.8);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border-bottom: 1px solid rgba(128, 184, 255, 0.08);
}

.nav-shell {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  background: rgba(14, 26, 47, 0.82);
  border: 1px solid var(--line-card);
  border-radius: 22px;
  padding: 9px 12px 9px 16px;
  box-shadow: var(--shadow-card);
}

.brand {
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
}

.brand-mark {
  display: inline-flex;
  align-items: baseline;
  gap: 1px;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1;
}

.brand-j {
  color: var(--blue);
  font-size: 1.35rem;
}

.brand-nine {
  color: #f5b657;
  font-size: 1.5rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: rgba(255, 190, 92, 0.13);
  border: 1px solid rgba(255, 190, 92, 0.28);
  border-radius: 50%;
  width: 1.6em;
  height: 1.6em;
  margin: 0 2px;
  box-shadow: 0 0 16px rgba(255, 190, 92, 0.18);
}

.brand-domain {
  color: #b6c7dc;
  font-size: 1.05rem;
  letter-spacing: 0;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 6px;
  overflow-x: auto;
  scrollbar-width: none;
  -ms-overflow-style: none;
  padding: 4px 2px;
}

.main-nav::-webkit-scrollbar {
  display: none;
}

.nav-item {
  display: inline-block;
  padding: 8px 15px;
  border-radius: 12px;
  color: var(--text-sub);
  background: rgba(255, 255, 255, 0.025);
  font-size: 0.9rem;
  font-weight: 500;
  border: 1px solid transparent;
  white-space: nowrap;
  position: relative;
}

.nav-item:hover {
  color: var(--text-hero);
  background: rgba(53, 201, 232, 0.08);
  border-color: rgba(53, 201, 232, 0.18);
}

.nav-item.is-active {
  color: #fff;
  background: rgba(53, 201, 232, 0.15);
  border-color: rgba(53, 201, 232, 0.26);
  box-shadow: inset 0 0 0 1px rgba(53, 201, 232, 0.12), 0 0 18px rgba(53, 201, 232, 0.14);
}

.nav-item.is-active::after {
  content: "";
  display: block;
  margin: 5px auto 0;
  width: 22px;
  height: 2px;
  border-radius: 3px;
  background: linear-gradient(90deg, var(--blue), var(--blue-deep));
}

.nav-cta {
  flex-shrink: 0;
}

/* Category hero */
.cat-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(58px, 7vw, 96px) 0 clamp(44px, 5vw, 72px);
  background:
    linear-gradient(180deg, rgba(8, 17, 32, 0.9) 30%, rgba(8, 17, 32, 0.62) 100%),
    url("/assets/images/backpic/back-2.webp") center / cover no-repeat;
}

.cat-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(128, 184, 255, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(128, 184, 255, 0.045) 1px, transparent 1px);
  background-size: 38px 38px;
  pointer-events: none;
}

.cat-hero::after {
  content: "";
  position: absolute;
  right: -120px;
  top: -80px;
  width: 420px;
  height: 420px;
  background: radial-gradient(circle, rgba(53, 201, 232, 0.14), transparent 65%);
  pointer-events: none;
}

.cat-hero-inner {
  position: relative;
  z-index: 1;
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 7px;
  font-size: 0.85rem;
  color: var(--text-mute);
  margin-bottom: 26px;
}

.breadcrumb a {
  color: var(--text-mute);
  border-bottom: 1px solid transparent;
}

.breadcrumb a:hover {
  color: var(--blue);
}

.breadcrumb .sep {
  opacity: 0.5;
}

.cat-hero h1 {
  font-size: clamp(2rem, 4.4vw, 3.4rem);
  font-weight: 700;
  line-height: 1.22;
  letter-spacing: 0.01em;
  margin-bottom: 20px;
  max-width: 840px;
  color: var(--text-hero);
}

.cat-hero .lead {
  font-size: clamp(1rem, 1.4vw, 1.2rem);
  line-height: 1.9;
  color: #b7cbdf;
  max-width: 76ch;
  margin-bottom: 28px;
}

.hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(17, 30, 52, 0.46);
  backdrop-filter: blur(8px);
  border: 1px solid var(--line-card);
  color: #b9cce1;
  font-size: 0.82rem;
  padding: 6px 13px;
  border-radius: 999px;
}

.tag-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--blue);
  box-shadow: 0 0 8px rgba(53, 201, 232, 0.8);
}

.tag-amber .tag-dot {
  background: var(--amber);
  box-shadow: 0 0 8px rgba(255, 190, 92, 0.7);
}

/* Main layout */
.cat-layout-wrap {
  padding: var(--section-space) 0 0;
}

.cat-layout {
  display: flex;
  flex-wrap: wrap;
}

.anchor-column {
  position: relative;
}

.anchor-card {
  position: sticky;
  top: 110px;
  background: var(--glass-bg);
  border: 1px solid var(--line-card);
  backdrop-filter: blur(14px);
  border-radius: var(--radius-outer);
  padding: 26px 22px;
  box-shadow: var(--shadow-card);
}

.anchor-card-title {
  font-size: 0.95rem;
  font-weight: 600;
  color: #d6e4f2;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid rgba(128, 184, 255, 0.14);
}

.anchor-list a {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 8px 10px;
  margin-bottom: 4px;
  color: var(--text-sub);
  border-radius: 11px;
  border: 1px solid transparent;
  font-size: 0.92rem;
}

.anchor-list a:hover {
  color: var(--text-hero);
  background: rgba(53, 201, 232, 0.08);
  border-color: rgba(53, 201, 232, 0.14);
}

.anchor-list .anchor-num {
  font-family: var(--font-num);
  font-size: 0.76rem;
  color: var(--amber);
  opacity: 0.82;
  min-width: 24px;
}

.anchor-badge {
  margin-top: 16px;
  border-radius: 14px;
  background: rgba(255, 190, 92, 0.08);
  border: 1px solid rgba(255, 190, 92, 0.15);
  padding: 16px 14px;
}

.anchor-badge p {
  font-size: 0.82rem;
  line-height: 1.7;
  color: #c3a274;
}

.cat-content {
  padding-left: clamp(20px, 3vw, 46px);
}

.content-section {
  margin-bottom: clamp(54px, 6vw, 80px);
  scroll-margin-top: 130px;
}

.section-head {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  margin-bottom: 26px;
}

.section-index {
  font-family: var(--font-num);
  font-size: 2rem;
  font-weight: 700;
  line-height: 1;
  color: transparent;
  -webkit-text-stroke: 1px rgba(255, 190, 92, 0.7);
  padding-top: 2px;
}

.section-title {
  font-size: clamp(1.5rem, 2.6vw, 2.1rem);
  font-weight: 650;
  line-height: 1.35;
}

.section-lead {
  color: var(--text-sub);
  max-width: 70ch;
  font-size: 1.02rem;
  margin-top: 8px;
}

/* Intro block */
.intro-panel {
  background: var(--glass-bg);
  border: 1px solid var(--line-card);
  border-radius: var(--radius-outer);
  padding: clamp(24px, 3.4vw, 38px);
  backdrop-filter: blur(8px);
  box-shadow: var(--shadow-card);
}

.intro-panel p {
  color: #bfcfe0;
  line-height: 1.95;
  margin-bottom: 1.2em;
}

.intro-panel p:last-child {
  margin-bottom: 0;
}

.intro-rule {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 24px;
}

/* Dimension cards */
.dimension-grid .cell {
  margin-bottom: 18px;
}

.dimension-card {
  height: 100%;
  background: rgba(20, 36, 60, 0.58);
  border: 1px solid var(--line-card);
  border-radius: var(--radius-card);
  padding: 24px 20px 22px;
  transition: transform 0.24s ease, border-color 0.24s ease, box-shadow 0.24s ease, background 0.24s ease;
  backdrop-filter: blur(6px);
}

.dimension-card:hover {
  transform: translateY(-2px);
  border-color: rgba(53, 201, 232, 0.36);
  background: rgba(22, 39, 66, 0.7);
  box-shadow: var(--shadow-float);
}

.dimension-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: 14px;
  margin-bottom: 16px;
  background: rgba(53, 201, 232, 0.11);
  border: 1px solid rgba(53, 201, 232, 0.22);
}

.dimension-card h3 {
  font-size: 1.14rem;
  font-weight: 600;
  margin-bottom: 10px;
}

.dimension-card p {
  font-size: 0.92rem;
  color: #a9bdd4;
  line-height: 1.85;
}

/* Split media block */
.media-split {
  background: rgba(14, 27, 48, 0.54);
  border: 1px solid var(--line-card);
  border-radius: var(--radius-outer);
  overflow: hidden;
  box-shadow: var(--shadow-card);
}

.media-side,
.content-side {
  min-height: 100%;
}

.media-side img {
  width: 100%;
  height: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  transition: transform 0.6s ease;
}

.media-split:hover .media-side img {
  transform: scale(1.02);
}

.content-side {
  padding: clamp(24px, 3vw, 36px);
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.content-side h3 {
  font-size: 1.4rem;
  font-weight: 650;
  line-height: 1.4;
  margin-bottom: 14px;
}

.content-side p {
  color: #b3c6dc;
  line-height: 1.9;
  margin-bottom: 18px;
}

.key-list {
  margin-top: 4px;
}

.key-list li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  color: #b6c9df;
  font-size: 0.94rem;
  padding: 8px 0;
  border-bottom: 1px dashed rgba(128, 184, 255, 0.1);
}

.key-list li:last-child {
  border-bottom: 0;
}

.key-list .li-mark {
  display: inline-flex;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--blue);
  margin-top: 11px;
  flex-shrink: 0;
}

/* Usage steps */
.step-list {
  counter-reset: usage;
}

.step-item {
  position: relative;
  display: grid;
  grid-template-columns: 72px 1fr;
  gap: 18px;
  background: rgba(17, 30, 52, 0.58);
  border: 1px solid var(--line-card);
  border-radius: var(--radius-card);
  padding: 24px 22px;
  margin-bottom: 16px;
  transition: border-color 0.25s ease, transform 0.25s ease;
}

.step-item:hover {
  transform: translateY(-2px);
  border-color: rgba(53, 201, 232, 0.3);
}

.step-num {
  font-family: var(--font-num);
  font-size: 2.2rem;
  font-weight: 700;
  line-height: 1;
  color: rgba(255, 190, 92, 0.88);
  text-shadow: 0 0 22px rgba(255, 190, 92, 0.22);
}

.step-body h3 {
  font-size: 1.12rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.step-body p {
  font-size: 0.95rem;
  color: #aabfd6;
  line-height: 1.85;
}

/* FAQ */
.faq-box {
  border-radius: var(--radius-outer);
  border: 1px solid var(--line-card);
  background: rgba(15, 28, 50, 0.6);
  overflow: hidden;
}

.faq-item {
  border-bottom: 1px solid rgba(128, 184, 255, 0.12);
}

.faq-item:last-child {
  border-bottom: 0;
}

.faq-q {
  width: 100%;
  background: transparent;
  border: 0;
  padding: 20px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  text-align: left;
  color: var(--text-hero);
  font-size: 1.04rem;
  font-weight: 600;
  cursor: pointer;
  transition: background-color 0.2s ease;
}

.faq-q:hover {
  background: rgba(53, 201, 232, 0.05);
}

.faq-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  border: 1px solid var(--line-card);
  flex-shrink: 0;
  transition: transform 0.3s ease, background-color 0.3s ease, border-color 0.3s ease;
  position: relative;
}

.faq-icon::before,
.faq-icon::after {
  content: "";
  position: absolute;
  background: var(--blue);
  border-radius: 2px;
  transition: background-color 0.2s ease;
}

.faq-icon::before {
  width: 10px;
  height: 2px;
}

.faq-icon::after {
  width: 2px;
  height: 10px;
}

.faq-item.is-open .faq-icon {
  border-color: rgba(53, 201, 232, 0.5);
  transform: rotate(45deg);
}

.faq-a {
  display: none;
  padding: 0 24px 22px;
  color: #a9bed5;
  line-height: 1.9;
  font-size: 0.96rem;
  max-width: 76ch;
}

.faq-item.is-open .faq-a {
  display: block;
}

.faq-item.is-open .faq-q {
  color: #e7f3ff;
}

/* Contact section */
.contact-section {
  padding: var(--section-space) 0;
  background: rgba(12, 24, 48, 0.35);
  border-top: 1px solid rgba(128, 184, 255, 0.1);
  border-bottom: 1px solid rgba(128, 184, 255, 0.1);
}

.contact-grid {
  background: var(--glass-bg);
  border: 1px solid var(--line-card);
  border-radius: var(--radius-outer);
  box-shadow: var(--shadow-float);
  overflow: hidden;
}

.contact-info {
  background: linear-gradient(160deg, rgba(53, 201, 232, 0.18), rgba(90, 121, 255, 0.08) 70%);
  padding: clamp(26px, 3vw, 40px);
  height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.contact-info h2 {
  font-size: clamp(1.6rem, 2.8vw, 2.2rem);
  font-weight: 650;
  line-height: 1.4;
  margin-bottom: 16px;
}

.contact-info p {
  color: #bfd1e4;
  line-height: 1.9;
  margin-bottom: 20px;
}

.contact-form-wrap {
  padding: clamp(24px, 3vw, 40px);
  background: rgba(10, 21, 40, 0.7);
}

.form-label {
  display: block;
  font-size: 0.9rem;
  color: #c2d3e6;
  margin: 0 0 8px 2px;
  font-weight: 500;
}

.form-control {
  width: 100%;
  background: rgba(8, 18, 35, 0.7);
  border: 1px solid rgba(128, 184, 255, 0.2);
  border-radius: var(--radius-btn);
  padding: 12px 15px;
  color: var(--text-hero);
  font-size: 0.96rem;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.form-control::placeholder {
  color: #5e7591;
}

.form-control:focus {
  outline: none;
  border-color: rgba(53, 201, 232, 0.55);
  box-shadow: 0 0 0 4px rgba(53, 201, 232, 0.12);
}

textarea.form-control {
  min-height: 120px;
  resize: vertical;
  line-height: 1.7;
}

.form-status {
  margin-top: 14px;
  font-size: 0.9rem;
  color: #7ee0f5;
  min-height: 22px;
}

/* Footer */
.site-footer {
  background:
    linear-gradient(rgba(8, 17, 32, 0.94), rgba(6, 12, 24, 0.97)),
    radial-gradient(circle at 50% 100%, rgba(53, 201, 232, 0.08), transparent 40%);
  border-top: 1px solid rgba(128, 184, 255, 0.12);
  padding-top: 50px;
  margin-top: var(--section-space);
}

.footer-top {
  padding-bottom: 36px;
  border-bottom: 1px solid rgba(128, 184, 255, 0.1);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.3fr 0.9fr 0.9fr 1fr;
  gap: 34px;
}

.footer-brand {
  display: inline-flex;
  margin-bottom: 14px;
}

.footer-about p {
  color: #8aa2bd;
  font-size: 0.9rem;
  line-height: 1.85;
  margin-top: 8px;
  max-width: 34ch;
}

.footer-column h4 {
  color: #d5e3f1;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 14px;
  letter-spacing: 0.02em;
}

.footer-column ul li {
  margin-bottom: 8px;
}

.footer-column ul a {
  color: #7f97b3;
  font-size: 0.9rem;
  line-height: 1.5;
}

.footer-column ul a:hover {
  color: var(--blue);
}

.footer-bottom {
  padding: 22px 0 20px;
}

.footer-bottom-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  color: #607996;
  font-size: 0.85rem;
}

.footer-bottom-inner p {
  color: #6b85a2;
}

@media (max-width: 1024px) {
  .nav-shell {
    gap: 10px;
    padding-left: 12px;
  }

  .main-nav {
    -webkit-overflow-scrolling: touch;
  }

  .anchor-column {
    width: 100%;
    order: 2;
    margin-top: 30px;
  }

  .cat-content {
    width: 100%;
    order: 1;
    padding-left: 0;
  }

  .anchor-card {
    position: static;
  }

  .anchor-list {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
  }

  .anchor-list a {
    margin-bottom: 0;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .site-header {
    padding-top: 6px;
  }

  .nav-shell {
    flex-wrap: nowrap;
    border-radius: 16px;
    padding: 8px 6px;
  }

  .brand {
    padding-left: 6px;
  }

  .brand-j {
    font-size: 1.2rem;
  }

  .brand-nine {
    font-size: 1.32rem;
    width: 1.55em;
    height: 1.55em;
  }

  .brand-domain {
    font-size: 0.95rem;
  }

  .main-nav {
    flex: 1 1 auto;
    gap: 4px;
    padding: 0 2px;
  }

  .nav-item {
    padding: 7px 10px;
    font-size: 0.84rem;
    border-radius: 10px;
  }

  .nav-cta {
    padding: 7px 10px;
    font-size: 0.8rem;
    margin-right: 4px;
  }

  .cat-hero {
    padding-top: 44px;
    padding-bottom: 34px;
  }

  .section-index {
    font-size: 1.7rem;
  }

  .step-item {
    grid-template-columns: 48px 1fr;
    padding: 20px 16px;
  }

  .step-num {
    font-size: 1.9rem;
  }

  .content-side {
    padding: 22px 18px;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 26px;
  }

  .footer-about p {
    max-width: 46ch;
  }

  .footer-bottom-inner {
    align-items: flex-start;
    flex-direction: column;
  }
}

@media (max-width: 520px) {
  body {
    font-size: 0.96rem;
  }

  .grid-container {
    padding-left: 14px;
    padding-right: 14px;
  }

  .nav-shell {
    gap: 6px;
  }

  .brand-nine {
    display: none;
  }

  .nav-item {
    font-size: 0.8rem;
    padding: 7px 9px;
  }

  .nav-cta {
    display: none;
  }

  .cat-hero h1 {
    font-size: 2.1rem;
  }

  .intro-panel {
    padding: 20px 18px;
  }

  .dimension-card {
    padding: 20px 16px;
  }

  .contact-form-wrap,
  .contact-info {
    padding: 22px 18px;
  }

  .footer-column {
    border-left: 2px solid rgba(53, 201, 232, 0.14);
    padding-left: 12px;
  }
}