/* ZC-AI website extension · matching the visual cues in the provided zszcai.com screenshot.
   No external framework / font / image loading. */
:root{--ink:#17191e;--ink-soft:#30313a;--muted:#74737e;--subtle:#94919c;--line:rgba(52,48,69,.09);--panel:rgba(255,255,255,.78);--bg:#faf8fd;--brand:#242329;--accent:#534a88;--radius:19px;--max:1180px}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei","Noto Sans CJK SC","Helvetica Neue",Arial,sans-serif;font-size:16px;line-height:1.8;background:linear-gradient(148deg,#f9f7fd 0%,#fdfaff 39%,#f9f7fd 85%,#fbf9ff 100%);-webkit-font-smoothing:antialiased}
body:before{content:"";position:fixed;inset:0;background:radial-gradient(ellipse 60% 38% at 16% 10%,rgba(224,209,247,.18),transparent),radial-gradient(ellipse 45% 30% at 91% 44%,rgba(220,212,243,.13),transparent);z-index:-1;pointer-events:none}
a{color:inherit;text-decoration:none}
a:hover{color:#423a7d}
a:focus-visible,button:focus-visible{outline:3px solid #c1b6e2;outline-offset:3px;border-radius:5px}
.site-header{background:rgba(250,248,253,.83);border-bottom:1px solid rgba(35,27,50,.055)}
.header-inner{max-width:var(--max);margin:auto;min-height:88px;padding:12px 24px;display:flex;align-items:center;justify-content:space-between;gap:18px}
.brand{display:flex;gap:11px;align-items:center;font-weight:650;font-size:16px;letter-spacing:-.02em}
.brand-mark{display:flex;align-items:center;justify-content:center;flex:none;width:39px;height:39px;background:#1b1c21;border-radius:10px;color:#fff;font-size:15px;font-weight:750;letter-spacing:-.12em;padding-right:3px}
.brand-text{max-width:280px;line-height:1.45}
.nav{display:flex;align-items:center;gap:31px;color:#64636d;font-size:14px}
.nav a{white-space:nowrap;padding:7px 0}
.nav a.active{color:#16151a;font-weight:650;border-bottom:2px solid #6f6799}
main{max-width:var(--max);margin:0 auto;padding:0 24px 102px;min-height:65vh}
.hero{text-align:center;padding:92px 10px 56px}
.eyebrow{font-size:12px;letter-spacing:.2em;color:#80738b;font-weight:700;margin-bottom:20px}
.hero h1{font-size:clamp(38px,5.3vw,60px);font-weight:750;letter-spacing:-.065em;line-height:1.22;margin:0 auto 18px}
.hero p{font-size:17px;color:#73717b;margin:0 auto;max-width:680px;line-height:1.95}
.mini-status{display:inline-flex;margin:0 auto 22px;background:#fff;border:1px solid #e8e4ee;border-radius:50px;padding:4px 15px;font-size:12px;color:#736d80}
.content-space{margin-top:22px}
.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.cards.four{grid-template-columns:repeat(4,1fr)}
.card{border:1px solid var(--line);background:var(--panel);border-radius:var(--radius);padding:28px;min-height:195px;box-shadow:0 1px 2px rgba(60,51,70,.015)}
.card-icon{display:grid;place-items:center;width:46px;height:46px;border-radius:14px;background:#f1eff7;color:#4b4766;font-size:23px;margin-bottom:22px;font-weight:550}
.card h3{font-size:19px;font-weight:670;line-height:1.4;margin:0 0 10px}
.card p{font-size:14px;color:var(--muted);margin:0;line-height:1.9}
.overline{font-size:13px;color:var(--accent);font-weight:650;letter-spacing:.1em}
.section-title{font-size:32px;line-height:1.35;letter-spacing:-.04em;margin:12px 0 22px}
.section-intro{font-size:15px;color:var(--muted);max-width:770px;margin:0 0 30px}
.section{margin-top:98px}
.feature-split{display:grid;grid-template-columns:1.1fr .9fr;gap:60px;align-items:center}
.feature-list{display:grid;gap:13px}
.feature-line{border:1px solid var(--line);border-radius:14px;padding:18px 20px;background:var(--panel)}
.feature-line b{display:block;margin-bottom:4px;font-size:15px}
.feature-line span{color:var(--muted);font-size:13px}
.soft-panel{background:linear-gradient(135deg,#f1edf8,#fff);border:1px solid var(--line);border-radius:25px;padding:44px;min-height:270px}
.soft-panel .big-quote{font-size:27px;font-weight:700;line-height:1.65;letter-spacing:-.045em}
.btn{display:inline-flex;align-items:center;justify-content:center;min-height:45px;padding:0 22px;border-radius:11px;background:#2d2935;color:white!important;font-size:14px;font-weight:600;border:1px solid #2d2935}
.btn:hover{background:#4a415c;color:white!important}
.btn-light{background:white;color:#24222d!important;border-color:#dedbe7}
.btn-light:hover{background:#f7f5fb;color:#24222d!important}
.btn-row{display:flex;flex-wrap:wrap;gap:12px;margin-top:24px}
.notice{margin:0 auto 26px;max-width:900px;background:rgba(244,240,249,.9);border:1px solid #e7e0ed;color:#625a71;border-radius:13px;padding:14px 20px;font-size:13px;line-height:1.8}
.notice strong{color:#494153}
.legal-layout{display:grid;grid-template-columns:245px minmax(0,1fr);gap:27px;align-items:start;margin-top:18px}
.toc,.legal-doc{border:1px solid var(--line);background:var(--panel);border-radius:21px}
.toc{position:sticky;top:24px;padding:22px 20px}
.toc h2{font-size:15px;margin:0 0 18px;line-height:1.5}
.toc nav{display:grid;gap:6px}
.toc nav a{font-size:13px;padding:5px 8px;color:#76737d;border-radius:7px}
.toc nav a:hover{background:#f5f2f9;color:#413b60}
.legal-doc{padding:43px 50px}
.legal-doc h2{font-size:22px;letter-spacing:-.03em;line-height:1.4;margin:35px 0 14px;scroll-margin-top:20px}
.legal-doc h2:first-child{margin-top:0}
.legal-doc h3{font-size:16px;margin:20px 0 8px}
.legal-doc p,.legal-doc li{font-size:14px;color:#575660;line-height:2.0}
.legal-doc ul,.legal-doc ol{padding-left:22px}
.legal-doc li{margin-bottom:6px}
.legal-doc b,.legal-doc strong{color:#2e2b33}
.legal-doc .legal-lead{font-size:15px;line-height:2;color:#42414c}
.legal-doc .requires{background:#f5f1f8;border-left:3px solid #b5a1c8;padding:11px 14px;margin-top:16px;border-radius:0 10px 10px 0;color:#615a69;font-size:13px}
.legal-doc .divider{border:0;border-top:1px solid var(--line);margin:30px 0 12px}
.callout{margin-top:70px;padding:34px 45px;display:flex;justify-content:space-between;align-items:center;gap:28px;border-radius:22px;border:1px solid var(--line);background:var(--panel)}
.callout h3{margin:0 0 4px;font-size:23px}
.callout p{margin:0;color:var(--muted);font-size:14px}
.footer{border-top:1px solid rgba(56,49,69,.07);padding:66px 24px 20px;background:rgba(251,249,255,.35)}
.footer-inner{max-width:var(--max);margin:auto;display:grid;grid-template-columns:1.45fr 1fr .7fr;gap:48px}
.footer .brand{font-size:16px}
.footer p,.footer a{font-size:13px;color:#817b85}
.footer p{margin:10px 0 0}
.footer h4{font-size:15px;margin:2px 0 14px;font-weight:580}
.footer-links{display:grid;gap:9px}
.footer-bottom{max-width:var(--max);margin:56px auto 0;border-top:1px solid rgba(52,48,69,.08);padding-top:18px;text-align:center;font-size:12px;color:#86818b}
.page-chip{display:inline-flex;border:1px solid #ddd6e8;background:#faf8fe;border-radius:7px;color:#6c6380;padding:3px 9px;font-size:12px}
@media(max-width:860px){.header-inner{min-height:76px}.nav{gap:16px}.nav a{font-size:12px}.cards,.cards.four{grid-template-columns:repeat(2,1fr)}.feature-split{grid-template-columns:1fr;gap:20px}.legal-layout{grid-template-columns:1fr}.toc{position:relative;top:auto}.toc nav{grid-template-columns:repeat(2,1fr)}.legal-doc{padding:30px 25px}.footer-inner{gap:20px}.footer{padding-top:48px}}
@media(max-width:580px){.header-inner{padding:13px 18px;align-items:flex-start;flex-wrap:wrap;gap:13px}.brand-text{font-size:13px}.brand-mark{width:34px;height:34px;font-size:13px}.nav{width:100%;overflow-x:auto;gap:22px;padding-bottom:4px}.nav a{font-size:12px}main{padding:0 17px 65px}.hero{padding:60px 8px 38px}.hero h1{font-size:37px}.hero p{font-size:14px}.section{margin-top:60px}.cards,.cards.four{grid-template-columns:1fr;gap:14px}.card{min-height:0;padding:23px}.section-title{font-size:26px}.soft-panel{padding:28px;min-height:0}.soft-panel .big-quote{font-size:23px}.callout{margin-top:50px;flex-direction:column;align-items:flex-start;padding:26px}.legal-layout{gap:13px}.legal-doc{padding:24px 21px}.legal-doc h2{font-size:19px}.toc nav{grid-template-columns:repeat(2,1fr)}.footer-inner{grid-template-columns:1fr 1fr;gap:32px}.footer-inner>div:first-child{grid-column:1/-1}.footer-bottom{margin-top:40px}.notice{padding:12px 14px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}