/* roulang page: index */
:root{
      --ink:#171614;
      --ink-2:#211e1b;
      --ink-3:#2b2723;
      --lime:#c8f34a;
      --lime-hi:#dbff73;
      --berry:#cb4e83;
      --apricot:#f2a65a;
      --paper:#f3f0e8;
      --paper-2:#e8e2d6;
      --text:#f7f4ee;
      --muted:#bbb5ab;
      --darktext:#26231f;
      --darkmuted:#625d56;
      --line:rgba(247,244,238,.14);
      --line-dark:rgba(38,35,31,.14);
      --radius-xl:24px;
      --radius-lg:16px;
      --radius-md:12px;
      --shadow:0 18px 46px rgba(0,0,0,.2);
      --container:1200px;
      --ease:220ms cubic-bezier(.2,.75,.25,1);
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{
      margin:0;background:var(--ink);color:var(--text);
      font-family:"PingFang SC","Microsoft YaHei","Noto Sans SC",Arial,sans-serif;
      font-size:16px;line-height:1.78;overflow-x:hidden;
    }
    body::before{
      content:"";position:fixed;inset:0;pointer-events:none;z-index:-1;opacity:.23;
      background-image:linear-gradient(rgba(255,255,255,.028) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.022) 1px,transparent 1px);
      background-size:34px 34px;
    }
    a{color:inherit;text-decoration:none}
    button,input,select,textarea{font:inherit}
    button{cursor:pointer}
    img{max-width:100%;display:block}
    ::selection{background:var(--lime);color:var(--ink)}
    :focus-visible{outline:3px solid var(--lime);outline-offset:3px}
    .container{width:min(calc(100% - 64px),var(--container));margin-inline:auto}
    .skip{position:absolute;left:-999px;top:8px;background:var(--lime);color:var(--ink);padding:8px 14px;border-radius:8px;font-weight:700;z-index:100}
    .skip:focus{left:16px}
    .site-header{
      position:sticky;top:0;z-index:50;background:rgba(23,22,20,.96);
      border-bottom:1px solid transparent;transition:var(--ease);
    }
    .site-header.scrolled{border-color:var(--line);box-shadow:0 8px 24px rgba(0,0,0,.13)}
    .nav{height:78px;display:flex;align-items:center;gap:28px}
    .brand{display:inline-flex;align-items:center;gap:10px;min-width:max-content;font-weight:800;letter-spacing:.02em;font-size:17px}
    .brand-mark{width:30px;height:30px;border:2px solid var(--lime);border-radius:9px;position:relative;display:grid;place-items:center}
    .brand-mark:before{content:"";width:9px;height:9px;background:var(--lime);clip-path:polygon(0 0,100% 50%,0 100%);margin-left:2px}
    .brand-mark:after{content:"9";position:absolute;right:-7px;bottom:-9px;font-size:10px;line-height:16px;width:16px;height:16px;text-align:center;border-radius:50%;background:var(--berry);color:#fff}
    .nav-links{display:flex;align-items:center;gap:24px;margin-left:auto}
    .nav-links a{color:var(--muted);font-size:14px;position:relative;padding:8px 0;transition:color var(--ease)}
    .nav-links a:after{content:"";height:1px;background:var(--lime);position:absolute;left:0;right:100%;bottom:3px;transition:right var(--ease)}
    .nav-links a:hover,.nav-links a.active{color:var(--text)}
    .nav-links a:hover:after,.nav-links a.active:after{right:0}
    .button{
      display:inline-flex;justify-content:center;align-items:center;gap:8px;min-height:46px;padding:10px 18px;border:1px solid transparent;border-radius:var(--radius-md);
      font-weight:800;font-size:14px;transition:transform var(--ease),background var(--ease),border-color var(--ease),box-shadow var(--ease);
    }
    .button:hover{transform:translateY(-2px)}
    .button-primary{background:var(--lime);color:var(--ink);box-shadow:0 7px 20px rgba(200,243,74,.12)}
    .button-primary:hover{background:var(--lime-hi);box-shadow:0 10px 26px rgba(200,243,74,.24)}
    .button-secondary{border-color:var(--line);color:var(--text);background:rgba(255,255,255,.025)}
    .button-secondary:hover{background:var(--paper);border-color:var(--paper);color:var(--ink)}
    .button[disabled]{opacity:.48;cursor:not-allowed;transform:none;box-shadow:none}
    .nav-cta{margin-left:4px}
    .menu-toggle{display:none;margin-left:auto;border:1px solid var(--line);background:transparent;color:var(--text);width:44px;height:44px;border-radius:10px}
    .mobile-menu{display:none}
    .eyebrow,.tag{
      display:inline-flex;align-items:center;gap:6px;border-radius:999px;padding:4px 10px;font-size:12px;line-height:1.4;font-weight:700;
    }
    .eyebrow{background:rgba(200,243,74,.12);color:var(--lime);border:1px solid rgba(200,243,74,.24)}
    .tag{background:rgba(255,255,255,.07);border:1px solid var(--line);color:var(--muted)}
    .tag.lime{color:var(--lime);border-color:rgba(200,243,74,.28);background:rgba(200,243,74,.1)}
    .tag.berry{color:#ffb3d0;border-color:rgba(203,78,131,.45);background:rgba(203,78,131,.15)}
    h1,h2,h3,p{margin-top:0}
    h1{font-size:clamp(40px,5vw,56px);line-height:1.16;letter-spacing:-.045em;margin-bottom:20px;font-weight:850}
    h2{font-size:clamp(29px,3.2vw,38px);line-height:1.24;letter-spacing:-.035em;margin-bottom:16px;font-weight:800}
    h3{font-size:20px;line-height:1.35;margin-bottom:8px;font-weight:800}
    .section-copy{color:var(--muted);max-width:650px;margin-bottom:30px}
    .section{padding:104px 0}
    .hero{padding:54px 0 54px;position:relative;overflow:hidden}
    .hero:before{content:"";position:absolute;width:600px;height:600px;right:-250px;top:-340px;border:1px solid rgba(200,243,74,.19);border-radius:50%}
    .hero:after{content:"09 / INDEX";position:absolute;right:4%;bottom:18px;color:rgba(247,244,238,.065);font-size:clamp(75px,13vw,180px);font-weight:800;line-height:1;letter-spacing:-.08em;pointer-events:none}
    .hero-grid{display:grid;grid-template-columns:1.02fr .98fr;gap:48px;align-items:stretch;position:relative;z-index:1}
    .hero-copy{padding:38px 0 22px}
    .hero-copy p{font-size:17px;color:var(--muted);max-width:610px;margin-bottom:26px}
    .action-row{display:flex;flex-wrap:wrap;gap:12px;margin-bottom:20px}
    .notice{display:flex;gap:10px;align-items:flex-start;color:var(--muted);font-size:13px;max-width:610px}
    .notice svg{flex:0 0 18px;color:var(--apricot);margin-top:4px}
    .dash{
      min-height:450px;padding:18px;background:#201e1a;border:1px solid var(--line);border-radius:var(--radius-xl);
      display:grid;grid-template-columns:1.2fr .8fr;grid-template-rows:1fr 1fr;gap:12px;box-shadow:var(--shadow);position:relative;overflow:hidden;
    }
    .dash:before{content:"";position:absolute;inset:0;background:linear-gradient(135deg,transparent 45%,rgba(200,243,74,.07) 45.2%,transparent 45.5%);pointer-events:none}
    .metric{position:relative;border:1px solid var(--line);border-radius:16px;padding:19px;background:rgba(255,255,255,.025);overflow:hidden}
    .metric-main{grid-row:span 2;background:linear-gradient(155deg,#302d27,#201f1b)}
    .metric-main:after{content:"";position:absolute;width:220px;height:220px;bottom:-108px;right:-80px;border-radius:50%;background:var(--lime);opacity:.13}
    .metric-kicker{font-size:12px;color:var(--muted);display:flex;justify-content:space-between;align-items:center}
    .metric-kicker i{width:8px;height:8px;border-radius:50%;background:var(--lime);display:inline-block;box-shadow:0 0 0 4px rgba(200,243,74,.12)}
    .metric-number{font-size:clamp(55px,6vw,76px);letter-spacing:-.07em;line-height:1;margin:39px 0 6px;color:var(--lime);font-weight:850}
    .metric-label{font-weight:800;font-size:18px}
    .metric-desc{font-size:13px;color:var(--muted);margin-top:8px;max-width:220px}
    .progress{height:5px;border-radius:99px;background:rgba(255,255,255,.1);overflow:hidden;margin-top:24px}
    .progress span{display:block;width:74%;height:100%;background:linear-gradient(90deg,var(--lime),var(--berry));border-radius:inherit}
    .metric-small .metric-number{font-size:38px;margin:20px 0 3px}
    .metric-small .metric-label{font-size:14px}
    .metric-small .metric-desc{font-size:12px;margin-top:3px}
    .mini-lines{display:flex;gap:4px;position:absolute;right:15px;bottom:16px;align-items:flex-end;height:28px}
    .mini-lines b{display:block;width:5px;border-radius:4px;background:var(--berry)}.mini-lines b:nth-child(1){height:10px}.mini-lines b:nth-child(2){height:22px;background:var(--lime)}.mini-lines b:nth-child(3){height:15px}.mini-lines b:nth-child(4){height:28px;background:var(--apricot)}
    .ticker{border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:13px 0;color:var(--muted);font-size:13px}
    .ticker-inner{display:flex;align-items:center;gap:18px;overflow:auto;white-space:nowrap;scrollbar-width:thin}
    .ticker b{color:var(--lime)} .ticker-dot{width:5px;height:5px;background:var(--berry);border-radius:50%;display:inline-block}
    .matrix{background:var(--ink-2)}
    .matrix-layout{display:grid;grid-template-columns:1.18fr .82fr;gap:18px}
    .matrix-stack{display:grid;gap:18px}
    .index-card{border:1px solid var(--line);border-radius:var(--radius-lg);background:rgba(255,255,255,.025);padding:27px;position:relative;overflow:hidden;transition:var(--ease)}
    .index-card:hover{transform:translateY(-4px);border-color:rgba(200,243,74,.55);background:rgba(255,255,255,.045)}
    .index-card.tall{min-height:340px;display:flex;flex-direction:column;justify-content:flex-end}
    .card-num{position:absolute;top:21px;left:24px;color:var(--berry);font-size:13px;font-weight:800;letter-spacing:.08em}
    .shape{position:absolute;right:24px;top:22px;width:112px;height:88px;border:1px solid rgba(200,243,74,.33);border-radius:16px;transform:rotate(-9deg)}
    .shape:before{content:"";position:absolute;width:54px;height:54px;border-radius:50%;background:rgba(203,78,131,.42);right:-16px;bottom:-17px}
    .shape:after{content:"";position:absolute;width:45px;height:4px;background:var(--lime);left:17px;top:25px;box-shadow:0 13px 0 rgba(247,244,238,.33),0 26px 0 rgba(247,244,238,.16)}
    .index-card p{font-size:14px;color:var(--muted);max-width:400px;margin-bottom:18px}
    .tag-row{display:flex;gap:7px;flex-wrap:wrap}
    .compact{min-height:161px;padding-right:138px}
    .compact .shape{transform:scale(.72) rotate(10deg);top:14px;right:10px}
    .comparison{background:var(--paper);color:var(--darktext)}
    .comparison .section-copy{color:var(--darkmuted)}
    .compare-wrap{display:grid;grid-template-columns:1fr 110px 1fr;gap:18px;align-items:center}
    .compare-panel{border:1px solid var(--line-dark);border-radius:var(--radius-xl);padding:30px;background:#ebe6dc;min-height:330px}
    .compare-panel.good{background:#f7f5ed;border:2px solid var(--lime);box-shadow:0 14px 32px rgba(77,97,10,.12)}
    .compare-head{display:flex;justify-content:space-between;gap:12px;align-items:center;margin-bottom:20px}
    .compare-head strong{font-size:20px}
    .compare-list{list-style:none;padding:0;margin:0}
    .compare-list li{padding:13px 0;border-bottom:1px solid var(--line-dark);display:flex;justify-content:space-between;gap:12px;font-size:14px}
    .compare-list li span:last-child{font-weight:750;text-align:right}
    .compare-panel:not(.good) .compare-list li span:last-child{color:#837d73}
    .compare-panel.good .compare-list li span:last-child{color:#557100}
    .compare-arrow{text-align:center;color:var(--berry);font-size:38px;font-weight:800}
    .topic-track{margin-top:25px;border-top:1px solid var(--line-dark);padding-top:20px;display:flex;gap:9px;flex-wrap:wrap}
    .topic-track .tag{color:var(--darkmuted);border-color:var(--line-dark);background:transparent}
    .guide{padding-bottom:60px}
    .guide-grid{display:grid;grid-template-columns:.8fr 1.2fr;gap:44px;align-items:center}
    .guide-side{border-left:2px solid var(--berry);padding-left:22px}
    .guide-side p{color:var(--muted);margin-bottom:0}
    .steps{counter-reset:step;display:grid;gap:0}
    .step{display:grid;grid-template-columns:56px 1fr;gap:18px;padding:18px 0;border-bottom:1px solid var(--line)}
    .step:before{counter-increment:step;content:"0" counter(step);font-size:15px;color:var(--lime);font-weight:850;padding-top:4px}
    .step p{color:var(--muted);font-size:14px;margin:0}
    .updates{background:#1d1b18}
    .updates-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:38px}
    .update-list{border-top:1px solid var(--line)}
    .update-item{display:grid;grid-template-columns:82px 1fr auto;gap:18px;align-items:center;padding:19px 0;border-bottom:1px solid var(--line);transition:var(--ease)}
    .update-item:hover{padding-left:9px;background:rgba(255,255,255,.025)}
    .update-date{color:var(--apricot);font-size:13px;font-weight:700}
    .update-item h3{font-size:17px;margin:0 0 3px}.update-item p{font-size:13px;color:var(--muted);margin:0}
    .update-link{font-size:13px;color:var(--lime);font-weight:800}
    .feature-note{border:1px solid var(--line);border-radius:var(--radius-xl);padding:28px;background:linear-gradient(150deg,#28251f,#1b1a17);position:relative;overflow:hidden}
    .feature-note:after{content:"精选";position:absolute;right:-12px;bottom:-36px;color:rgba(200,243,74,.09);font-size:110px;font-weight:850}
    .feature-note p{color:var(--muted);font-size:14px;position:relative}.feature-note .button{margin-top:9px;position:relative}
    .faq{background:linear-gradient(to bottom,var(--ink) 0%,var(--ink) 43%,var(--paper) 43%,var(--paper) 100%);padding-top:104px}
    .faq-layout{display:grid;grid-template-columns:.78fr 1.22fr;gap:54px;align-items:start}
    .faq-copy{padding-top:14px}.faq-copy p{color:var(--muted)}
    .faq-rule{margin-top:24px;padding:15px 16px;border-left:3px solid var(--apricot);background:rgba(242,166,90,.09);font-size:13px;color:var(--muted)}
    .faq-list{display:grid;gap:10px}
    .faq-item{border:1px solid var(--line);border-radius:14px;overflow:hidden;background:#201e1b}
    .faq-item.open{background:var(--paper);border-color:var(--paper)}
    .faq-question{width:100%;display:flex;align-items:center;gap:13px;text-align:left;padding:18px;background:transparent;color:var(--text);border:0;font-weight:800;font-size:16px}
    .faq-item.open .faq-question{color:var(--darktext)}
    .faq-no{color:var(--berry);font-size:12px;font-weight:850}
    .faq-icon{margin-left:auto;width:24px;height:24px;display:grid;place-items:center;border:1px solid currentColor;border-radius:50%;font-size:17px;line-height:1;transition:transform var(--ease)}
    .faq-item.open .faq-icon{transform:rotate(45deg)}
    .faq-answer{display:none;padding:0 55px 19px 63px;color:var(--darkmuted);font-size:14px;line-height:1.85}
    .faq-item.open .faq-answer{display:block}
    .contact{background:var(--paper);color:var(--darktext);padding:0 0 104px}
    .form-panel{background:var(--paper);border-radius:0 0 var(--radius-xl) var(--radius-xl);padding:54px;box-shadow:0 15px 38px rgba(0,0,0,.16)}
    .form-grid{display:grid;grid-template-columns:.75fr 1.25fr;gap:54px}
    .form-intro p{color:var(--darkmuted)}.status-pills{display:flex;gap:8px;flex-wrap:wrap;margin-top:22px}
    .status-pills span{font-size:12px;border:1px solid var(--line-dark);border-radius:99px;padding:5px 9px;color:var(--darkmuted)}
    .form-fields{display:grid;grid-template-columns:1fr 1fr;gap:16px}
    .field{display:grid;gap:6px}.field.full{grid-column:1/-1}
    label{font-size:13px;font-weight:800} .required{color:var(--berry)}
    input,select,textarea{width:100%;border:1px solid #c9c1b4;border-radius:10px;background:#fbf9f3;color:var(--darktext);padding:12px 13px;outline:none;transition:border var(--ease),box-shadow var(--ease)}
    textarea{min-height:100px;resize:vertical}
    input:focus,select:focus,textarea:focus{border-color:#869d2d;box-shadow:0 0 0 3px rgba(200,243,74,.28)}
    .check{grid-column:1/-1;display:flex;align-items:flex-start;gap:9px;color:var(--darkmuted);font-size:13px}
    .check input{width:17px;height:17px;margin-top:4px;accent-color:#789600}
    .form-error{grid-column:1/-1;color:#a32759;font-size:13px;min-height:20px;margin:0}
    .form-success{display:none;grid-column:1/-1;padding:13px 15px;border-radius:10px;background:#e0f5a5;color:#314000;font-weight:700;font-size:14px}
    .form-success.show{display:block}
    .form-submit{grid-column:1/-1;justify-self:start}
    .back-top{position:fixed;right:24px;bottom:24px;width:46px;height:46px;border-radius:12px;border:1px solid var(--line);background:#27241f;color:var(--lime);display:grid;place-items:center;opacity:0;pointer-events:none;transform:translateY(10px);transition:var(--ease);z-index:20}
    .back-top.show{opacity:1;pointer-events:auto;transform:translateY(0)}
    footer{border-top:1px solid var(--line);padding:58px 0 24px;background:#12110f}
    .footer-grid{display:grid;grid-template-columns:1.15fr .8fr .8fr;gap:42px}
    .footer-brand{font-size:19px;font-weight:850;margin-bottom:10px}.footer-copy{color:var(--muted);font-size:13px;max-width:350px}
    .footer-title{font-size:13px;color:var(--lime);font-weight:800;margin-bottom:12px}
    .footer-links{display:grid;gap:8px}.footer-links a{font-size:13px;color:var(--muted);width:max-content}.footer-links a:hover{color:var(--text)}
    .copyright{margin-top:38px;padding-top:17px;border-top:1px solid var(--line);color:#807a70;font-size:12px;display:flex;justify-content:space-between;gap:12px}
    .skeleton{display:none;height:70px;border-radius:12px;background:linear-gradient(90deg,#2c2924 25%,#3a362f 38%,#2c2924 55%);background-size:200% 100%;animation:shine 1.2s infinite}
    @keyframes shine{to{background-position:-200% 0}}
    @media (max-width:1024px){
      .container{width:min(calc(100% - 48px),var(--container))}
      .hero-grid,.faq-layout,.form-grid{grid-template-columns:1fr;gap:30px}
      .hero-copy{padding-top:10px}.dash{min-height:385px;max-width:760px}
      .matrix-layout{grid-template-columns:1fr}.matrix-stack{grid-template-columns:1fr 1fr}
      .guide-grid,.updates-grid{grid-template-columns:1fr;gap:28px}
      .faq{background:linear-gradient(to bottom,var(--ink) 0%,var(--ink) 36%,var(--paper) 36%,var(--paper) 100%)}
    }
    @media (max-width:767px){
      .container{width:min(calc(100% - 32px),var(--container))}
      .nav{height:68px;gap:10px}.brand{font-size:14px}.brand-mark{width:27px;height:27px}
      .nav-links,.nav-cta{display:none}.menu-toggle{display:grid;place-items:center}
      .mobile-menu{padding:10px 16px 18px;border-top:1px solid var(--line);background:#1d1b18}
      .mobile-menu.open{display:grid;gap:4px}.mobile-menu a{padding:11px 4px;color:var(--muted);font-size:14px}.mobile-menu .button{margin-top:8px}
      .section{padding:68px 0}.hero{padding:34px 0 38px}h1{font-size:36px}.hero-copy p{font-size:15px}
      .dash{grid-template-columns:1.15fr .85fr;min-height:350px;padding:12px}.metric{padding:15px}.metric-number{margin-top:28px}.metric-main .metric-number{font-size:59px}
      .matrix-stack{grid-template-columns:1fr}.compact{min-height:158px}.compare-wrap{grid-template-columns:1fr;gap:12px}.compare-arrow{transform:rotate(90deg);height:35px}
      .compare-panel{min-height:auto;padding:23px}.faq{padding-top:68px;background:linear-gradient(to bottom,var(--ink) 0%,var(--ink) 31%,var(--paper) 31%,var(--paper) 100%)}
      .faq-answer{padding:0 20px 17px}.form-panel{padding:32px 20px}.form-fields{grid-template-columns:1fr}.form-submit{width:100%}
      .update-item{grid-template-columns:62px 1fr}.update-link{grid-column:2}.footer-grid{grid-template-columns:1fr;gap:26px}.copyright{display:block}.copyright span{display:block;margin-bottom:5px}
    }
    @media (max-width:480px){
      h1{font-size:31px}.section-copy{font-size:15px}.action-row{display:grid}.action-row .button{width:100%}
      .dash{display:flex;overflow:auto;scroll-snap-type:x mandatory;min-height:auto}.metric{min-width:220px;min-height:205px;scroll-snap-align:start}.metric-main{min-width:260px}.metric-main .metric-number{font-size:54px}
      .index-card{padding:22px}.index-card.tall{min-height:280px}.shape{transform:scale(.78) rotate(-9deg);right:8px;top:13px}.compact{padding-right:112px}
      .update-item{gap:10px}.back-top{right:16px;bottom:16px}
    }
    @media (prefers-reduced-motion:reduce){*,*:before,*:after{scroll-behavior:auto!important;animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}}

/* roulang page: category1 */
:root{
 --ink:#171614;--ink-2:#211e1b;--ink-3:#2b2723;--lime:#c8f34a;--lime-hi:#dbff73;
 --berry:#cb4e83;--apricot:#f2a65a;--paper:#f3f0e8;--paper-2:#e8e2d6;
 --text:#f7f4ee;--muted:#bbb5ab;--darktext:#26231f;--darkmuted:#625d56;
 --line:rgba(247,244,238,.14);--line-dark:rgba(38,35,31,.14);
 --radius-xl:24px;--radius-lg:16px;--radius-md:12px;--shadow:0 18px 46px rgba(0,0,0,.2);
 --container:1200px;--ease:220ms cubic-bezier(.2,.75,.25,1)
}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--ink);color:var(--text);font-family:"PingFang SC","Microsoft YaHei","Noto Sans SC",Arial,sans-serif;font-size:16px;line-height:1.78;overflow-x:hidden}
body:before{content:"";position:fixed;inset:0;z-index:-1;pointer-events:none;opacity:.23;background-image:linear-gradient(rgba(255,255,255,.028) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.022) 1px,transparent 1px);background-size:34px 34px}
a{color:inherit;text-decoration:none}button,input,select,textarea{font:inherit}button{cursor:pointer}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible{outline:3px solid var(--lime);outline-offset:3px}img{max-width:100%;display:block}
.container{width:min(calc(100% - 64px),var(--container));margin-inline:auto}
.site-header{position:sticky;top:0;z-index:50;background:rgba(23,22,20,.96);border-bottom:1px solid transparent;transition:var(--ease)}
.site-header.scrolled{border-color:var(--line);box-shadow:0 8px 24px rgba(0,0,0,.13)}
.nav{height:78px;display:flex;align-items:center;gap:28px}.brand{display:inline-flex;align-items:center;gap:10px;min-width:max-content;font-weight:800;letter-spacing:.02em;font-size:17px}
.brand-mark{width:30px;height:30px;border:2px solid var(--lime);border-radius:9px;position:relative;display:grid;place-items:center}.brand-mark:before{content:"";width:9px;height:9px;background:var(--lime);clip-path:polygon(0 0,100% 50%,0 100%);margin-left:2px}.brand-mark:after{content:"9";position:absolute;right:-7px;bottom:-9px;font-size:10px;line-height:16px;width:16px;height:16px;text-align:center;border-radius:50%;background:var(--berry);color:#fff}
.nav-links{display:flex;align-items:center;gap:24px;margin-left:auto}.nav-links a{color:var(--muted);font-size:14px;position:relative;padding:8px 0;transition:color var(--ease)}.nav-links a:after{content:"";height:1px;background:var(--lime);position:absolute;left:0;right:100%;bottom:3px;transition:right var(--ease)}.nav-links a:hover,.nav-links a.active{color:var(--text)}.nav-links a:hover:after,.nav-links a.active:after{right:0}
.button{display:inline-flex;justify-content:center;align-items:center;gap:8px;min-height:46px;padding:10px 18px;border:1px solid transparent;border-radius:var(--radius-md);font-weight:800;font-size:14px;transition:transform var(--ease),background var(--ease),border-color var(--ease),box-shadow var(--ease)}.button:hover{transform:translateY(-2px)}.button-primary{background:var(--lime);color:var(--ink);box-shadow:0 7px 20px rgba(200,243,74,.12)}.button-primary:hover{background:var(--lime-hi);box-shadow:0 10px 26px rgba(200,243,74,.24)}.button-secondary{border-color:var(--line);color:var(--text);background:rgba(255,255,255,.025)}.button-secondary:hover{background:var(--paper);border-color:var(--paper);color:var(--ink)}.button[disabled]{opacity:.48;cursor:not-allowed;transform:none;box-shadow:none}.nav-cta{margin-left:4px}
.menu-toggle{display:none;margin-left:auto;border:1px solid var(--line);background:transparent;color:var(--text);width:44px;height:44px;border-radius:10px}.mobile-menu{display:none}
.eyebrow,.tag{display:inline-flex;align-items:center;gap:6px;border-radius:999px;padding:4px 10px;font-size:12px;line-height:1.4;font-weight:700}.eyebrow{background:rgba(200,243,74,.12);color:var(--lime);border:1px solid rgba(200,243,74,.24)}.tag{background:rgba(255,255,255,.07);border:1px solid var(--line);color:var(--muted)}.tag.lime{color:var(--lime);border-color:rgba(200,243,74,.28);background:rgba(200,243,74,.1)}.tag.berry{color:#ffb3d0;border-color:rgba(203,78,131,.45);background:rgba(203,78,131,.15)}
.page-head{padding:52px 0 36px;position:relative;border-bottom:1px solid var(--line)}.page-head:after{content:"01 / BROWSE";position:absolute;right:5%;bottom:0;font-weight:800;font-size:clamp(50px,9vw,120px);letter-spacing:-.08em;line-height:.8;color:rgba(247,244,238,.055);pointer-events:none}.breadcrumbs{display:flex;gap:9px;color:var(--muted);font-size:13px;margin-bottom:18px}.breadcrumbs span{color:var(--lime)}h1,h2,h3,p{margin-top:0}h1{font-size:clamp(32px,4.3vw,54px);line-height:1.16;letter-spacing:-.04em;margin-bottom:14px;max-width:820px}h2{font-size:clamp(28px,3vw,36px);line-height:1.25;letter-spacing:-.03em;margin-bottom:14px}h3{font-size:19px;line-height:1.4;margin-bottom:8px}.head-row{display:flex;justify-content:space-between;align-items:end;gap:32px;position:relative;z-index:1}.lead{max-width:720px;color:var(--muted);font-size:16px;margin-bottom:0}.head-stat{min-width:190px;padding:16px 18px;border:1px solid var(--line);border-radius:var(--radius-md);background:rgba(255,255,255,.035)}.head-stat strong{display:block;color:var(--lime);font-size:25px;line-height:1.1}.head-stat span{font-size:12px;color:var(--muted)}
.section{padding:78px 0}.quickbar{display:flex;align-items:center;gap:11px;overflow:auto;padding:18px 0;border-bottom:1px solid var(--line)}.quickbar strong{font-size:13px;white-space:nowrap;color:var(--muted)}.quickbar a{white-space:nowrap;padding:6px 11px;border-radius:999px;border:1px solid var(--line);font-size:13px;transition:var(--ease)}.quickbar a:hover{border-color:var(--lime);color:var(--lime)}
.catalog-layout{display:grid;grid-template-columns:260px minmax(0,1fr);gap:28px;align-items:start}.filter-panel{position:sticky;top:100px;border:1px solid var(--line);border-radius:var(--radius-lg);background:var(--ink-2);padding:20px}.filter-panel h2{font-size:18px;margin-bottom:18px}.filter-group{padding:15px 0;border-top:1px solid var(--line)}.filter-group:first-of-type{border-top:0;padding-top:0}.filter-label{display:block;font-size:13px;font-weight:800;margin-bottom:10px}.filter-option{display:flex;align-items:center;justify-content:space-between;gap:8px;color:var(--muted);font-size:13px;padding:7px 0}.filter-option input{accent-color:var(--lime)}.filter-option em{font-style:normal;color:#817b72;font-size:11px}.filter-reset{width:100%;margin-top:9px;background:transparent;color:var(--lime);border:1px solid rgba(200,243,74,.36);border-radius:10px;padding:9px;font-weight:700}
.result-tools{display:flex;justify-content:space-between;align-items:center;gap:16px;margin-bottom:16px}.result-tools p{margin:0;color:var(--muted);font-size:14px}.tool-buttons{display:flex;gap:8px}.tool-icon{width:38px;height:38px;background:transparent;color:var(--muted);border:1px solid var(--line);border-radius:10px}.tool-icon.active,.tool-icon:hover{color:var(--lime);border-color:rgba(200,243,74,.5)}
.update-line{display:flex;gap:10px;flex-wrap:wrap;padding:12px 14px;border-radius:12px;background:rgba(242,166,90,.08);border:1px solid rgba(242,166,90,.2);font-size:13px;color:#e9c9a5;margin-bottom:18px}.update-line b{color:var(--apricot)}
.catalog-list{display:grid;gap:14px}.catalog-card{display:grid;grid-template-columns:8px 150px minmax(0,1fr) auto;gap:18px;align-items:center;padding:16px;background:var(--ink-2);border:1px solid var(--line);border-radius:var(--radius-lg);transition:var(--ease)}.catalog-card:hover{transform:translateY(-4px);border-color:rgba(200,243,74,.55);box-shadow:var(--shadow)}.color-strip{align-self:stretch;border-radius:9px;background:var(--lime)}.catalog-card:nth-child(3n) .color-strip{background:var(--berry)}.catalog-card:nth-child(4n) .color-strip{background:var(--apricot)}
.abstract-cover{height:120px;border-radius:12px;overflow:hidden;position:relative;background:linear-gradient(135deg,#4c5930 0 35%,#28251f 35% 64%,#a94873 64%);isolation:isolate}.abstract-cover:before{content:"";position:absolute;inset:17px auto auto 18px;width:58px;height:58px;border:1px solid rgba(255,255,255,.6);border-radius:50%}.abstract-cover:after{content:attr(data-no);position:absolute;right:11px;bottom:-15px;color:rgba(255,255,255,.75);font-size:56px;font-weight:800;line-height:1}.catalog-card:nth-child(3n) .abstract-cover{background:linear-gradient(125deg,#4b263a 0 37%,#26231f 37% 67%,#b68547 67%)}.catalog-card:nth-child(4n) .abstract-cover{background:linear-gradient(135deg,#27434a 0 34%,#24221e 34% 67%,#637436 67%)}
.item-kicker{color:var(--lime);font-size:12px;font-weight:800}.item-copy p{font-size:13px;color:var(--muted);line-height:1.65;margin:6px 0 10px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.tag-row{display:flex;gap:6px;flex-wrap:wrap}.catalog-action{min-width:105px;text-align:right}.catalog-action small{display:block;color:var(--muted);font-size:11px;margin-bottom:8px}.feature-callout{padding:26px 28px;border-radius:var(--radius-lg);position:relative;overflow:hidden;background:linear-gradient(110deg,#3f2533,#282720 56%,#43502b);border:1px solid rgba(200,243,74,.32)}.feature-callout:after{content:"专题 / 09";position:absolute;right:22px;top:12px;font-size:13px;font-weight:800;color:rgba(247,244,238,.35)}.feature-callout p{max-width:650px;color:#d6d0c7;margin-bottom:13px}.feature-callout .button{position:relative;z-index:1}
.related{background:var(--paper);color:var(--darktext)}.related .section-copy{color:var(--darkmuted)}.related-grid{display:grid;grid-template-columns:1fr 1fr;gap:20px}.related-card{border-radius:var(--radius-xl);padding:28px;background:#e7e0d4;border:1px solid var(--line-dark);position:relative;overflow:hidden;transition:var(--ease)}.related-card:hover{transform:translateY(-4px);box-shadow:0 15px 35px rgba(0,0,0,.12)}.related-card:after{content:"";position:absolute;width:150px;height:150px;right:-45px;bottom:-58px;border-radius:50%;background:var(--lime);opacity:.55}.related-card:nth-child(2):after{background:var(--berry)}.related-card p{color:var(--darkmuted);max-width:440px}.related-card .button{position:relative;z-index:1}.feedback{padding:64px 0;background:var(--ink-3)}.feedback-box{display:flex;justify-content:space-between;align-items:center;gap:24px;padding:30px;border:1px solid var(--line);border-radius:var(--radius-xl)}.feedback-box h2{font-size:26px;margin:0 0 7px}.feedback-box p{margin:0;color:var(--muted);max-width:650px}
footer{padding:62px 0 25px;background:#11100f;border-top:1px solid var(--line)}.footer-grid{display:grid;grid-template-columns:1.5fr .8fr .8fr;gap:42px}.footer-brand{font-size:18px;font-weight:800;margin-bottom:8px}.footer-copy{margin:0;color:var(--muted);font-size:14px;max-width:390px}.footer-title{font-weight:800;font-size:14px;margin-bottom:11px}.footer-links{display:grid;gap:7px}.footer-links a{font-size:14px;color:var(--muted);transition:color var(--ease)}.footer-links a:hover{color:var(--lime)}.copyright{margin-top:40px;padding-top:18px;border-top:1px solid var(--line);display:flex;justify-content:space-between;gap:16px;color:#817b72;font-size:12px}
.back-top{position:fixed;right:22px;bottom:22px;width:46px;height:46px;border-radius:12px;background:var(--lime);color:var(--ink);border:0;font-weight:900;opacity:0;pointer-events:none;transform:translateY(10px);transition:var(--ease)}.back-top.show{opacity:1;pointer-events:auto;transform:none}
.empty-state{display:none;text-align:center;padding:38px;border:1px dashed var(--line);border-radius:var(--radius-lg);color:var(--muted)}.empty-icon{width:52px;height:38px;border:2px solid var(--lime);border-radius:7px;margin:0 auto 12px;position:relative}.empty-icon:before{content:"";position:absolute;width:22px;height:8px;left:5px;top:-9px;border:2px solid var(--lime);border-bottom:0;border-radius:6px 6px 0 0}
@media(max-width:1024px){.nav{gap:18px}.nav-links{gap:15px}.catalog-layout{grid-template-columns:220px minmax(0,1fr)}.catalog-card{grid-template-columns:7px 120px minmax(0,1fr)}.catalog-action{grid-column:3;text-align:left}.footer-grid{gap:25px}}
@media(max-width:768px){.container{width:min(calc(100% - 32px),var(--container))}.nav{height:70px}.nav-links,.nav-cta{display:none}.menu-toggle{display:block}.mobile-menu.open{display:grid;gap:5px;padding:11px 16px 17px;border-top:1px solid var(--line);background:var(--ink-2)}.mobile-menu a{padding:10px 5px;color:var(--muted)}.mobile-menu a.active{color:var(--lime)}.mobile-menu .button{margin-top:5px}.page-head{padding:38px 0 30px}.head-row{display:block}.head-stat{margin-top:20px;width:max-content}.section{padding:58px 0}.catalog-layout{grid-template-columns:1fr}.filter-panel{position:static}.filter-panel.collapsed .filter-group,.filter-panel.collapsed .filter-reset{display:none}.filter-panel h2{margin:0}.filter-toggle{display:inline-flex!important;float:right;margin-top:-30px}.catalog-card{grid-template-columns:7px 105px minmax(0,1fr);gap:13px}.catalog-action{grid-column:2 / -1}.related-grid,.footer-grid{grid-template-columns:1fr}.feedback-box{display:block}.feedback-box .button{margin-top:20px}.copyright{display:block}.copyright span{display:block;margin:4px 0}}
@media(min-width:769px){.filter-toggle{display:none}}
@media(max-width:520px){h1{font-size:31px}.brand{font-size:15px}.catalog-card{grid-template-columns:7px minmax(0,1fr)}.abstract-cover{height:105px}.item-copy{grid-column:2}.catalog-action{grid-column:2}.result-tools{align-items:flex-start;flex-direction:column}.feature-callout{padding:22px}.related-card{padding:23px}.back-top{right:14px;bottom:14px}.quickbar{margin-inline:-16px;padding-inline:16px}}
@media(prefers-reduced-motion:reduce){*,*:before,*:after{scroll-behavior:auto!important;transition:none!important;animation:none!important}}

/* roulang page: category2 */
:root{
 --ink:#171614;--ink-2:#211e1b;--ink-3:#2b2723;--lime:#c8f34a;--lime-hi:#dbff73;
 --berry:#cb4e83;--apricot:#f2a65a;--paper:#f3f0e8;--paper-2:#e8e2d6;
 --text:#f7f4ee;--muted:#bbb5ab;--darktext:#26231f;--darkmuted:#625d56;
 --line:rgba(247,244,238,.14);--line-dark:rgba(38,35,31,.14);
 --radius-xl:24px;--radius-lg:16px;--radius-md:12px;--shadow:0 18px 46px rgba(0,0,0,.2);
 --container:1200px;--ease:220ms cubic-bezier(.2,.75,.25,1);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--ink);color:var(--text);font-family:"PingFang SC","Microsoft YaHei","Noto Sans SC",Arial,sans-serif;font-size:16px;line-height:1.78;overflow-x:hidden}
body:before{content:"";position:fixed;inset:0;z-index:-1;pointer-events:none;opacity:.25;background-image:linear-gradient(rgba(255,255,255,.027) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.021) 1px,transparent 1px);background-size:34px 34px}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font:inherit}
button{cursor:pointer}
button:focus-visible,a:focus-visible,input:focus-visible,textarea:focus-visible{outline:3px solid var(--lime);outline-offset:3px}
.container{width:min(calc(100% - 64px),var(--container));margin-inline:auto}
.site-header{position:sticky;top:0;z-index:50;background:rgba(23,22,20,.97);border-bottom:1px solid transparent;transition:var(--ease)}
.site-header.scrolled{border-color:var(--line);box-shadow:0 8px 24px rgba(0,0,0,.15)}
.nav{height:78px;display:flex;align-items:center;gap:28px}
.brand{display:inline-flex;align-items:center;gap:10px;min-width:max-content;font-weight:800;letter-spacing:.02em;font-size:17px}
.brand-mark{width:30px;height:30px;border:2px solid var(--lime);border-radius:9px;position:relative;display:grid;place-items:center}
.brand-mark:before{content:"";width:9px;height:9px;background:var(--lime);clip-path:polygon(0 0,100% 50%,0 100%);margin-left:2px}
.brand-mark:after{content:"9";position:absolute;right:-7px;bottom:-9px;font-size:10px;line-height:16px;width:16px;height:16px;text-align:center;border-radius:50%;background:var(--berry);color:#fff}
.nav-links{display:flex;align-items:center;gap:24px;margin-left:auto}
.nav-links a{color:var(--muted);font-size:14px;position:relative;padding:8px 0;transition:color var(--ease)}
.nav-links a:after{content:"";height:1px;background:var(--lime);position:absolute;left:0;right:100%;bottom:3px;transition:right var(--ease)}
.nav-links a:hover,.nav-links a.active{color:var(--text)}
.nav-links a:hover:after,.nav-links a.active:after{right:0}
.button{display:inline-flex;justify-content:center;align-items:center;gap:8px;min-height:46px;padding:10px 18px;border:1px solid transparent;border-radius:var(--radius-md);font-weight:800;font-size:14px;transition:transform var(--ease),background var(--ease),border-color var(--ease),box-shadow var(--ease)}
.button:hover{transform:translateY(-2px)}
.button-primary{background:var(--lime);color:var(--ink);box-shadow:0 7px 20px rgba(200,243,74,.12)}
.button-primary:hover{background:var(--lime-hi);box-shadow:0 10px 26px rgba(200,243,74,.24)}
.button-secondary{border-color:var(--line);color:var(--text);background:rgba(255,255,255,.025)}
.button-secondary:hover{background:var(--paper);border-color:var(--paper);color:var(--ink)}
.nav-cta{margin-left:4px}
.menu-toggle{display:none;margin-left:auto;width:44px;height:44px;border-radius:10px;border:1px solid var(--line);background:transparent;color:var(--text)}
.mobile-menu{display:none}
.eyebrow,.tag{display:inline-flex;align-items:center;gap:6px;border-radius:999px;padding:4px 10px;font-size:12px;line-height:1.4;font-weight:700}
.eyebrow{color:var(--lime);background:rgba(200,243,74,.12);border:1px solid rgba(200,243,74,.24)}
.tag{color:var(--muted);background:rgba(255,255,255,.06);border:1px solid var(--line)}
.tag.lime{color:var(--lime);border-color:rgba(200,243,74,.28);background:rgba(200,243,74,.1)}
.tag.berry{color:#ffb3d0;border-color:rgba(203,78,131,.45);background:rgba(203,78,131,.15)}
.section{padding:104px 0}
.section-title{font-size:clamp(28px,3vw,38px);line-height:1.24;letter-spacing:-.035em;margin:0 0 14px;font-weight:800}
.section-copy{max-width:680px;color:var(--muted);margin:0}
.breadcrumb{display:flex;gap:8px;align-items:center;color:var(--muted);font-size:13px;margin-bottom:18px}
.breadcrumb span{color:var(--berry)}
.page-head{padding:58px 0 40px;position:relative;border-bottom:1px solid var(--line)}
.page-head:after{content:"TOPIC / 09";position:absolute;right:4%;bottom:4px;font-size:clamp(52px,10vw,140px);line-height:1;color:rgba(247,244,238,.045);font-weight:900;letter-spacing:-.08em;pointer-events:none}
.page-head-inner{position:relative;z-index:1;display:grid;grid-template-columns:1.05fr .95fr;gap:42px;align-items:end}
.page-head h1{font-size:clamp(32px,4.1vw,54px);letter-spacing:-.05em;line-height:1.16;margin:14px 0 18px;max-width:680px}
.page-head p{color:var(--muted);max-width:650px;margin:0;font-size:16px}
.head-stats{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.stat-box{border:1px solid var(--line);border-radius:var(--radius-lg);padding:18px;background:rgba(255,255,255,.025)}
.stat-box strong{display:block;color:var(--lime);font-size:26px;line-height:1.1;margin-bottom:6px}
.stat-box span{font-size:13px;color:var(--muted)}
.topic-track{padding:22px 0;border-bottom:1px solid var(--line);overflow:auto}
.track-inner{display:flex;align-items:center;gap:10px;min-width:max-content}
.track-label{font-size:12px;color:var(--berry);font-weight:800;letter-spacing:.08em;margin-right:8px}
.track-item{border:1px solid var(--line);border-radius:999px;padding:8px 14px;font-size:13px;color:var(--muted);transition:var(--ease)}
.track-item:hover,.track-item.current{color:var(--ink);background:var(--lime);border-color:var(--lime)}
.feature-grid{display:grid;grid-template-columns:7fr 5fr;gap:20px;align-items:stretch}
.feature-main,.feature-info,.chapter-card,.usage-card,.cta-panel{border:1px solid var(--line);border-radius:var(--radius-xl);position:relative;overflow:hidden}
.feature-main{min-height:425px;padding:42px;display:flex;align-items:flex-end;background:linear-gradient(135deg,#343027 0%,#24211e 54%,#302024 100%)}
.feature-main:before{content:"";position:absolute;width:360px;height:360px;right:-100px;top:-140px;border:54px solid rgba(200,243,74,.12);border-radius:50%}
.feature-main:after{content:"02";position:absolute;right:25px;bottom:-35px;font-size:170px;line-height:1;font-weight:900;color:rgba(247,244,238,.08)}
.feature-copy{position:relative;z-index:1;max-width:520px}
.feature-copy h2{font-size:clamp(28px,3vw,42px);line-height:1.2;margin:15px 0 14px;letter-spacing:-.04em}
.feature-copy p{color:var(--muted);margin:0 0 22px;max-width:500px}
.tag-row{display:flex;flex-wrap:wrap;gap:7px;margin:0 0 25px}
.abstract-cover{position:absolute;right:46px;top:42px;width:190px;height:142px;border:1px solid rgba(247,244,238,.22);border-radius:16px;transform:rotate(7deg);overflow:hidden;background:#1c1a18}
.abstract-cover:before{content:"";position:absolute;width:170px;height:70px;background:var(--lime);top:20px;left:-35px;transform:rotate(-26deg);opacity:.8}
.abstract-cover:after{content:"";position:absolute;width:110px;height:110px;border:1px solid var(--berry);border-radius:50%;bottom:-35px;right:-15px}
.cover-play{position:absolute;z-index:1;left:77px;top:55px;width:38px;height:38px;border:2px solid var(--paper);border-radius:50%}
.cover-play:after{content:"";position:absolute;left:14px;top:9px;border-left:11px solid var(--paper);border-top:8px solid transparent;border-bottom:8px solid transparent}
.feature-info{background:var(--paper);color:var(--darktext);padding:30px;display:flex;flex-direction:column}
.feature-info h2{font-size:22px;line-height:1.3;margin:13px 0 20px}
.info-list{list-style:none;padding:0;margin:0}
.info-list li{padding:13px 0;border-bottom:1px solid var(--line-dark);display:flex;gap:12px;align-items:flex-start;font-size:14px}
.info-num{color:var(--berry);font-weight:900;min-width:24px}
.info-list small{display:block;color:var(--darkmuted);margin-top:2px}
.info-note{margin-top:auto;background:#dfdacd;border-radius:12px;padding:13px 14px;color:var(--darkmuted);font-size:13px}
.progress-area{padding:0 0 104px}
.progress-panel{display:grid;grid-template-columns:190px 1fr auto;gap:24px;align-items:center;padding:22px 28px;border:1px solid var(--line);border-radius:var(--radius-lg);background:var(--ink-2)}
.progress-panel strong{font-size:15px}
.progress-panel small{color:var(--muted);display:block;font-size:13px}
.progress-line{height:9px;background:#3a3530;border-radius:999px;overflow:hidden;position:relative}
.progress-line span{display:block;width:62%;height:100%;border-radius:inherit;background:linear-gradient(90deg,var(--lime),var(--berry))}
.progress-count{color:var(--lime);font-size:14px;font-weight:800}
.chapter-layout{display:grid;grid-template-columns:5fr 7fr;gap:20px;align-items:start}
.chapter-intro{padding:12px 24px 24px 0;position:sticky;top:105px}
.chapter-intro p{color:var(--muted);margin-bottom:22px}
.chapter-stack{display:grid;gap:16px}
.chapter-card{padding:25px;background:rgba(255,255,255,.025);display:grid;grid-template-columns:72px 1fr auto;gap:20px;align-items:center;transition:var(--ease)}
.chapter-card:hover{transform:translateY(-4px);border-color:rgba(200,243,74,.55);background:rgba(255,255,255,.045)}
.chapter-card:nth-child(2){margin-left:38px;background:#25211e}
.chapter-card:nth-child(3){margin-right:20px;background:linear-gradient(105deg,#2a2521,#261c22)}
.chapter-index{font-size:28px;font-weight:900;line-height:1;color:var(--berry);letter-spacing:-.05em}
.chapter-card h3{font-size:20px;line-height:1.35;margin:0 0 6px}
.chapter-card p{font-size:14px;color:var(--muted);margin:0 0 12px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.chapter-card .button{white-space:nowrap}
.light-section{background:var(--paper);color:var(--darktext)}
.light-section .section-copy{color:var(--darkmuted)}
.usage-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:20px;margin-top:34px}
.usage-card{padding:32px;background:#e7e0d4;border-color:var(--line-dark)}
.usage-card.dark{background:var(--ink-2);color:var(--text);border-color:var(--line)}
.usage-card h3{font-size:22px;margin:0 0 12px}
.usage-card p{margin:0 0 18px;color:var(--darkmuted)}
.usage-card.dark p{color:var(--muted)}
.rule-list{list-style:none;padding:0;margin:0}
.rule-list li{padding:11px 0;border-bottom:1px solid var(--line-dark);font-size:14px;display:flex;gap:10px}
.rule-list li:before{content:"";margin-top:10px;width:7px;height:7px;border-radius:50%;background:var(--berry);flex:none}
.dark .rule-list li{border-color:var(--line)}
.faq-wrap{display:grid;grid-template-columns:.8fr 1.2fr;gap:64px;align-items:start}
.faq-intro{padding-top:12px}
.faq-intro p{color:var(--muted)}
.notice{font-size:13px;color:var(--muted);border-left:3px solid var(--apricot);padding-left:14px;margin-top:24px}
.faq-list{display:grid;gap:10px}
.faq-item{border:1px solid var(--line);border-radius:var(--radius-md);overflow:hidden;background:rgba(255,255,255,.025)}
.faq-question{width:100%;border:0;background:transparent;color:var(--text);text-align:left;padding:18px 20px;display:flex;align-items:center;justify-content:space-between;gap:18px;font-weight:750;font-size:15px}
.faq-question span:last-child{color:var(--lime);font-size:22px;transition:transform var(--ease)}
.faq-question[aria-expanded="true"] span:last-child{transform:rotate(45deg);color:var(--berry)}
.faq-answer{display:none;background:var(--paper);color:var(--darktext);padding:2px 20px 19px;font-size:14px}
.faq-answer p{margin:10px 0 0}
.faq-item.open .faq-answer{display:block}
.cta-section{padding:0 0 104px}
.cta-panel{padding:42px;background:linear-gradient(110deg,#302b25,#201e1b);display:grid;grid-template-columns:1fr auto;gap:32px;align-items:center}
.cta-panel:before{content:"";position:absolute;width:230px;height:230px;border-radius:50%;border:1px solid rgba(200,243,74,.24);left:-90px;bottom:-125px}
.cta-panel h2{position:relative;font-size:30px;margin:0 0 8px;letter-spacing:-.035em}
.cta-panel p{position:relative;color:var(--muted);margin:0;max-width:650px}
footer{border-top:1px solid var(--line);padding:54px 0 24px;background:#131210}
.footer-grid{display:grid;grid-template-columns:1.3fr .8fr .8fr;gap:46px}
.footer-brand{font-size:18px;font-weight:850;margin-bottom:11px}
.footer-copy{color:var(--muted);font-size:13px;max-width:390px;margin:0}
.footer-title{font-size:14px;font-weight:800;margin-bottom:12px}
.footer-links{display:grid;gap:8px}
.footer-links a{font-size:13px;color:var(--muted);transition:color var(--ease)}
.footer-links a:hover{color:var(--lime)}
.copyright{margin-top:42px;padding-top:20px;border-top:1px solid var(--line);display:flex;justify-content:space-between;gap:18px;color:#847e75;font-size:12px}
.back-top{position:fixed;right:22px;bottom:22px;width:46px;height:46px;border-radius:12px;border:1px solid var(--line);background:var(--ink-2);color:var(--lime);opacity:0;visibility:hidden;transform:translateY(8px);transition:var(--ease);z-index:20}
.back-top.show{opacity:1;visibility:visible;transform:translateY(0)}
@media (max-width:1024px){
 .container{width:min(calc(100% - 48px),var(--container))}
 .nav{gap:18px}.nav-links{gap:16px}
 .page-head-inner,.feature-grid,.faq-wrap{grid-template-columns:1fr}
 .head-stats{max-width:550px}.chapter-layout{grid-template-columns:1fr}.chapter-intro{position:static;padding:0}
 .chapter-stack{margin-top:10px}.feature-main{min-height:385px}
}
@media (max-width:768px){
 .container{width:min(calc(100% - 32px),var(--container))}
 .nav{height:70px}.nav-links,.nav-cta{display:none}.menu-toggle{display:grid;place-items:center}
 .mobile-menu{position:absolute;top:70px;left:16px;right:16px;padding:14px;background:var(--ink-2);border:1px solid var(--line);border-radius:0 0 var(--radius-lg) var(--radius-lg);box-shadow:var(--shadow)}
 .mobile-menu.open{display:grid;gap:5px}.mobile-menu a{padding:11px 10px;color:var(--muted);border-radius:8px;font-size:14px}.mobile-menu a:hover,.mobile-menu a.active{color:var(--text);background:rgba(255,255,255,.06)}
 .mobile-menu .button{margin-top:7px}
 .section{padding:68px 0}.page-head{padding:42px 0 30px}.page-head h1{font-size:34px}
 .abstract-cover{right:18px;top:22px;transform:scale(.8) rotate(7deg);transform-origin:top right}
 .feature-main{padding:30px;min-height:410px}.progress-area{padding-bottom:68px}
 .progress-panel{grid-template-columns:1fr;gap:9px;padding:20px}.progress-count{justify-self:start}
 .chapter-card,.chapter-card:nth-child(2),.chapter-card:nth-child(3){margin:0;grid-template-columns:52px 1fr}
 .chapter-card .button{grid-column:2;justify-self:start}.usage-grid{grid-template-columns:1fr}
 .cta-panel{grid-template-columns:1fr;padding:30px}.cta-panel .button{justify-self:start}
 .footer-grid{grid-template-columns:1fr 1fr;gap:30px}.footer-grid>div:first-child{grid-column:1/-1}
}
@media (max-width:520px){
 body{font-size:15px}.brand{font-size:15px}.section-title{font-size:28px}
 .page-head h1{font-size:31px}.head-stats{grid-template-columns:1fr 1fr}.stat-box{padding:14px}.stat-box strong{font-size:22px}
 .feature-main{min-height:445px;padding:25px}.feature-copy h2{font-size:29px}
 .feature-info,.usage-card{padding:24px}.chapter-card{padding:20px;gap:14px}
 .chapter-card h3{font-size:18px}.chapter-index{font-size:23px}
 .faq-wrap{gap:26px}.faq-question{padding:16px;font-size:14px}.faq-answer{padding:2px 16px 17px}
 .footer-grid{grid-template-columns:1fr}.footer-grid>div:first-child{grid-column:auto}.copyright{display:grid;margin-top:30px}
 .back-top{right:16px;bottom:16px}.track-inner{padding-right:16px}
}
@media (prefers-reduced-motion:reduce){*,*:before,*:after{scroll-behavior:auto!important;transition:none!important;animation:none!important}}