/* ============================================================
   Yaowang Design System v1
   Shared foundation: reset, layout, type, buttons, motion
   ============================================================ */
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--font-body);font-size:16px;line-height:1.72;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font:inherit;color:inherit}
button{cursor:pointer}
h1,h2,h3,h4,p,figure,blockquote{margin:0}
ul,ol{margin:0;padding:0;list-style:none}
::selection{background:var(--accent);color:#fff}

:root{
  --container:1240px;
  --gutter:clamp(20px,4vw,48px);
  --section:clamp(72px,9vw,140px);
  --radius:2px;
  --ease:cubic-bezier(.22,.61,.36,1);
  --font-display:"Songti SC","Noto Serif CJK SC","Source Han Serif SC",Georgia,serif;
  --font-body:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;
}

.wrap{width:100%;max-width:var(--container);margin:0 auto;padding:0 var(--gutter)}
.section{padding:var(--section) 0}
.section-sm{padding:calc(var(--section)*.6) 0}
.eyebrow{font-size:11px;letter-spacing:.26em;text-transform:uppercase;color:var(--muted);display:flex;align-items:center;gap:12px}
.eyebrow::before{content:"";width:28px;height:1px;background:var(--accent);display:block}
.display{font-family:var(--font-display);font-weight:600;line-height:1.12;letter-spacing:.01em}
.h1{font-size:clamp(38px,6.2vw,76px)}
.h2{font-size:clamp(28px,4vw,46px);line-height:1.18}
.h3{font-size:clamp(21px,2.4vw,28px);line-height:1.3}
.lead{font-size:clamp(16px,1.5vw,19px);line-height:1.8;color:var(--muted);max-width:62ch}
.muted{color:var(--muted)}
.small{font-size:13px;line-height:1.7}
.rule{height:1px;background:var(--line);border:0;margin:0}

.btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;min-height:50px;padding:0 24px;border:1px solid transparent;border-radius:var(--radius);font-size:14px;font-weight:600;letter-spacing:.04em;transition:background .2s var(--ease),color .2s var(--ease),border-color .2s var(--ease),transform .2s var(--ease)}
.btn:hover{transform:translateY(-1px)}
.btn-primary{background:var(--accent);color:var(--on-accent)}
.btn-primary:hover{background:var(--accent-dark)}
.btn-ghost{border-color:var(--line-strong);color:var(--ink);background:transparent}
.btn-ghost:hover{border-color:var(--ink);background:var(--ink);color:var(--bg)}
.btn-light{background:rgba(255,255,255,.94);color:#1b1917}
.btn-light:hover{background:#fff}
.btn-sm{min-height:42px;padding:0 18px;font-size:13px}
.link-arrow{display:inline-flex;align-items:center;gap:8px;font-size:14px;font-weight:600;border-bottom:1px solid currentColor;padding-bottom:3px}
.link-arrow svg{width:15px;height:15px;transition:transform .2s var(--ease)}
.link-arrow:hover svg{transform:translateX(4px)}

/* header */
.site-header{position:fixed;inset:0 0 auto 0;z-index:60;transition:background .3s var(--ease),border-color .3s var(--ease),color .3s var(--ease);border-bottom:1px solid transparent}
.site-header .bar{display:flex;align-items:center;justify-content:space-between;gap:24px;height:78px}
.brand{display:flex;align-items:center;gap:12px;font-family:var(--font-display);font-size:20px;letter-spacing:.08em;font-weight:600;white-space:nowrap}
.brand .seal{width:34px;height:34px;border:1px solid currentColor;display:grid;place-items:center;font-size:15px;line-height:1;letter-spacing:0}
.nav{display:flex;align-items:center;gap:28px;font-size:13.5px;letter-spacing:.03em}
.nav a{opacity:.86;transition:opacity .2s}
.nav a:hover{opacity:1}
.header-actions{display:flex;align-items:center;gap:12px}
.site-header.on-hero{color:#fff}
.site-header.on-hero .btn-ghost{border-color:rgba(255,255,255,.42);color:#fff}
.site-header.on-hero .btn-ghost:hover{background:#fff;color:#1b1917;border-color:#fff}
.site-header.solid{background:var(--bg);color:var(--ink);border-bottom-color:var(--line)}
.site-header.solid .btn-ghost{border-color:var(--line-strong);color:var(--ink)}
.menu-btn{display:none;width:44px;height:44px;border:1px solid currentColor;background:transparent;color:inherit;place-items:center}
.menu-btn span{display:block;width:18px;height:1px;background:currentColor;position:relative}
.menu-btn span::before,.menu-btn span::after{content:"";position:absolute;left:0;width:18px;height:1px;background:currentColor}
.menu-btn span::before{top:-6px}.menu-btn span::after{top:6px}

/* hero */
.hero{position:relative;min-height:92vh;display:flex;align-items:flex-end;overflow:hidden;color:#fff;isolation:isolate}
.hero-media{position:absolute;inset:0;z-index:-2}
.hero-media img{width:100%;height:100%;object-fit:cover;object-position:center}
.hero::after{content:"";position:absolute;inset:0;z-index:-1;background:linear-gradient(180deg,rgba(12,14,12,.42) 0%,rgba(12,14,12,.18) 38%,rgba(12,14,12,.72) 100%)}
.hero .inner{padding-bottom:clamp(56px,8vw,110px);padding-top:150px;width:100%}
.hero .eyebrow{color:rgba(255,255,255,.78)}
.hero .eyebrow::before{background:rgba(255,255,255,.6)}
.hero h1{max-width:15ch;margin:18px 0 22px;text-wrap:balance}
.hero .lead{color:rgba(255,255,255,.86);max-width:52ch}
.hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:34px}
.hero-meta{display:flex;flex-wrap:wrap;gap:28px;margin-top:46px;padding-top:22px;border-top:1px solid rgba(255,255,255,.24);font-size:12.5px;letter-spacing:.08em;color:rgba(255,255,255,.78)}
.hero-meta b{display:block;font-family:var(--font-display);font-size:24px;letter-spacing:.02em;color:#fff;margin-bottom:2px}

/* trust strip */
.trust{border-bottom:1px solid var(--line);background:var(--bg-2)}
.trust .row{display:grid;grid-template-columns:repeat(4,1fr);gap:0}
.trust .item{padding:26px 28px;border-left:1px solid var(--line);display:flex;gap:14px;align-items:flex-start}
.trust .item:first-child{border-left:0}
.trust .num{font-family:var(--font-display);font-size:22px;line-height:1;color:var(--accent)}
.trust .txt{font-size:13px;line-height:1.55;color:var(--muted)}
.trust .txt b{display:block;color:var(--ink);font-size:13.5px;margin-bottom:2px}

/* split */
.split{display:grid;grid-template-columns:1fr 1fr;gap:clamp(32px,6vw,88px);align-items:center}
.split .media{position:relative}
.split .media img{width:100%;height:100%;object-fit:cover;aspect-ratio:4/5}
.split .media.tall img{aspect-ratio:3/4}
.media-caption{position:absolute;left:-1px;bottom:-1px;background:var(--bg);padding:12px 18px;font-size:12px;letter-spacing:.1em;color:var(--muted);border:1px solid var(--line);border-left:0;border-bottom:0}
.copy-block .h2{margin:16px 0 18px;text-wrap:balance}
.copy-block p{color:var(--muted);margin-bottom:14px}
.copy-block .link-arrow{margin-top:10px}

/* section head */
.section-head{display:flex;align-items:flex-end;justify-content:space-between;gap:32px;margin-bottom:clamp(32px,4vw,56px)}
.section-head .h2{max-width:18ch;margin-top:14px}
.section-head .aside{max-width:34ch;font-size:14px;color:var(--muted)}

/* cards */
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:clamp(16px,2.4vw,28px)}
.grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:clamp(16px,2.4vw,28px)}
.card{background:var(--card);border:1px solid var(--line);padding:clamp(20px,2.4vw,30px);transition:transform .25s var(--ease),border-color .25s var(--ease)}
.card:hover{transform:translateY(-3px);border-color:var(--line-strong)}
.card .k{font-size:11px;letter-spacing:.18em;color:var(--accent);text-transform:uppercase}
.card h3{margin:12px 0 8px;font-family:var(--font-display);font-size:20px;font-weight:600}
.card p{font-size:13.5px;color:var(--muted);line-height:1.7}

/* product */
.product{display:block;background:var(--card);border:1px solid var(--line);overflow:hidden;transition:transform .25s var(--ease),border-color .25s var(--ease)}
.product:hover{transform:translateY(-4px);border-color:var(--line-strong)}
.product .ph{aspect-ratio:1/1;background:var(--bg-3);overflow:hidden}
.product .ph img{width:100%;height:100%;object-fit:cover;transition:transform .6s var(--ease)}
.product:hover .ph img{transform:scale(1.035)}
.product .body{padding:22px 22px 24px}
.product .tag{font-size:11px;letter-spacing:.16em;color:var(--accent)}
.product h3{font-family:var(--font-display);font-size:21px;margin:8px 0 6px}
.product .desc{font-size:13px;color:var(--muted);min-height:44px}
.product .meta{display:flex;align-items:center;justify-content:space-between;margin-top:16px;padding-top:14px;border-top:1px solid var(--line);font-size:12.5px;color:var(--muted)}

/* steps */
.steps{counter-reset:s;display:grid;grid-template-columns:repeat(4,1fr);gap:0;border-top:1px solid var(--line);border-left:1px solid var(--line)}
.step{padding:28px 26px 30px;border-right:1px solid var(--line);border-bottom:1px solid var(--line);background:var(--card)}
.step .n{font-family:var(--font-display);font-size:13px;color:var(--accent);letter-spacing:.12em}
.step h3{font-family:var(--font-display);font-size:19px;margin:14px 0 8px}
.step p{font-size:13px;color:var(--muted)}

/* quote */
.quote{background:var(--ink);color:var(--bg);padding:clamp(56px,7vw,96px) 0}
.quote blockquote{font-family:var(--font-display);font-size:clamp(24px,3.4vw,40px);line-height:1.35;max-width:22ch}
.quote cite{display:block;margin-top:24px;font-style:normal;font-size:12px;letter-spacing:.18em;color:var(--accent-soft)}

/* cta band */
.cta-band{position:relative;overflow:hidden;color:#fff;isolation:isolate}
.cta-band img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;z-index:-2}
.cta-band::after{content:"";position:absolute;inset:0;background:linear-gradient(90deg,rgba(10,12,10,.82),rgba(10,12,10,.38));z-index:-1}
.cta-band .inner{padding:clamp(64px,8vw,110px) 0;max-width:640px}
.cta-band .h2{margin:14px 0 18px}
.cta-band p{color:rgba(255,255,255,.8);max-width:46ch}
.cta-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:30px}

/* footer */
.site-footer{background:var(--bg-2);border-top:1px solid var(--line);padding:56px 0 28px;font-size:13px;color:var(--muted)}
.footer-grid{display:grid;grid-template-columns:1.4fr repeat(3,1fr);gap:32px}
.footer-grid h4{font-size:12px;letter-spacing:.14em;color:var(--ink);margin-bottom:14px;text-transform:uppercase}
.footer-grid a{display:block;padding:4px 0}
.footer-grid a:hover{color:var(--accent)}
.footer-brand .brand{color:var(--ink);margin-bottom:14px}
.footer-brand p{max-width:34ch;font-size:13px;line-height:1.7}
.footer-bottom{display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap;margin-top:42px;padding-top:18px;border-top:1px solid var(--line);font-size:12px}
.disclaimer{margin-top:20px;font-size:11.5px;line-height:1.7;color:var(--muted);max-width:92ch}

/* quiz / form */
.field{display:flex;flex-direction:column;gap:7px;margin-bottom:14px}
.field label{font-size:12px;letter-spacing:.06em;color:var(--muted)}
.field input,.field select,.field textarea{min-height:46px;border:1px solid var(--line-strong);background:transparent;padding:10px 12px;border-radius:0;font-size:14px;width:100%}
.field input:focus,.field select:focus,.field textarea:focus{outline:2px solid var(--accent);outline-offset:1px;border-color:transparent}
.check{display:flex;gap:9px;align-items:flex-start;font-size:12px;line-height:1.6;color:var(--muted)}
.check input{margin-top:3px;width:15px;height:15px;flex:none;accent-color:var(--accent)}

/* cookie */
.cookie{position:fixed;left:18px;right:18px;bottom:18px;z-index:90;background:var(--ink);color:var(--bg);padding:16px 18px;display:none;gap:16px;align-items:center;justify-content:space-between;flex-wrap:wrap;font-size:12.5px;line-height:1.6;max-width:980px;margin:0 auto}
.cookie.show{display:flex}
.cookie a{text-decoration:underline;text-underline-offset:2px}
.cookie .acts{display:flex;gap:8px;flex:none}
.cookie button{background:transparent;border:1px solid rgba(255,255,255,.4);color:inherit;padding:7px 12px;font-size:12px}
.cookie button.primary{background:var(--accent);border-color:var(--accent);color:#fff}

/* reveal */
[data-reveal]{opacity:0;transform:translateY(18px);transition:opacity .7s var(--ease),transform .7s var(--ease)}
[data-reveal].in{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){[data-reveal]{opacity:1;transform:none;transition:none}html{scroll-behavior:auto}}

/* mobile */
@media(max-width:1024px){
  .nav{display:none}
  .menu-btn{display:grid}
  .trust .row{grid-template-columns:repeat(2,1fr)}
  .trust .item:nth-child(3){border-left:0}
  .trust .item:nth-child(n+3){border-top:1px solid var(--line)}
  .split{grid-template-columns:1fr;gap:32px}
  .split .media img{aspect-ratio:16/10}
  .steps{grid-template-columns:repeat(2,1fr)}
  .footer-grid{grid-template-columns:1fr 1fr}
}
@media(max-width:720px){
  body{font-size:15.5px}
  .site-header .bar{height:66px}
  .header-actions .btn{display:none}
  .hero{min-height:88vh}
  .hero .inner{padding-top:120px}
  .hero-actions .btn{width:100%}
  .grid-3,.grid-2{grid-template-columns:1fr}
  .trust .row{grid-template-columns:1fr}
  .trust .item{border-left:0;border-top:1px solid var(--line);padding:18px 20px}
  .trust .item:first-child{border-top:0}
  .steps{grid-template-columns:1fr}
  .section-head{flex-direction:column;align-items:flex-start;gap:14px}
  .footer-grid{grid-template-columns:1fr}
  .footer-bottom{flex-direction:column}
  .quote blockquote{max-width:none}
}
/* mobile drawer */
.mobile-menu{position:fixed;inset:0;z-index:70;background:var(--bg);padding:96px var(--gutter) 40px;transform:translateX(100%);transition:transform .35s var(--ease);overflow-y:auto;display:flex;flex-direction:column;gap:0}
.mobile-menu.open{transform:none}
.mobile-menu a.m-link{font-family:var(--font-display);font-size:26px;padding:16px 0;border-bottom:1px solid var(--line);display:flex;justify-content:space-between;align-items:center}
.mobile-menu a.m-link span{font-family:var(--font-body);font-size:11px;letter-spacing:.14em;color:var(--muted)}
.mobile-menu .m-actions{display:flex;flex-direction:column;gap:10px;margin-top:28px}
.mobile-menu .m-actions .btn{width:100%}
.mobile-menu .m-foot{margin-top:auto;padding-top:28px;font-size:12px;color:var(--muted)}