/* ============ 源肽生物 YUANTAI BIO — dark tech laboratory ============ */
:root{
  --bg:#0a0e14;
  --bg-2:#0d131c;
  --panel:#111927;
  --panel-2:#16202f;
  --line:#1f2b3d;
  --line-2:#2a3a52;
  --neon:#22d3ee;
  --neon-2:#67e8f9;
  --neon-dim:rgba(34,211,238,.14);
  --violet:#818cf8;
  --ink:#e6edf3;
  --muted:#8b9bb0;
  --sans:-apple-system,BlinkMacSystemFont,'PingFang SC','Segoe UI',sans-serif;
  --mono:ui-monospace,'SF Mono',Menlo,Consolas,monospace;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:100px}
body{margin:0;background:var(--bg);color:var(--ink);font:15px/1.75 var(--sans);
  background-image:
    linear-gradient(rgba(34,211,238,.035) 1px,transparent 1px),
    linear-gradient(90deg,rgba(34,211,238,.035) 1px,transparent 1px);
  background-size:44px 44px;}
a{color:inherit;text-decoration:none}
button,input{font:inherit}
button,a,input,summary{outline-offset:4px}
button{cursor:pointer}
button:disabled{opacity:.35;cursor:default}

/* ---------- notice ---------- */
.notice{background:linear-gradient(90deg,#0e2836,#132030);color:#67e8f9;text-align:center;font-size:11px;letter-spacing:2px;padding:8px 16px;border-bottom:1px solid var(--line)}

/* ---------- header ---------- */
.site-header{display:flex;align-items:center;justify-content:space-between;padding:18px 5%;border-bottom:1px solid var(--line);background:rgba(10,14,20,.86);backdrop-filter:blur(12px);position:sticky;top:0;z-index:5;gap:24px}
.brand{display:flex;align-items:center;gap:14px}
.brand-mark{display:grid;place-items:center;width:46px;height:46px;border:1px solid var(--neon);background:linear-gradient(135deg,#0e2836,#0a1622);color:var(--neon-2);font:700 15px/1 var(--mono);letter-spacing:2px;box-shadow:0 0 18px rgba(34,211,238,.28),inset 0 0 12px rgba(34,211,238,.12)}
.brand-text{font-size:20px;font-weight:700;letter-spacing:3px;color:var(--ink);display:flex;flex-direction:column;line-height:1.25}
.brand-text em{font-style:normal;font-size:9px;letter-spacing:4px;font-weight:600;color:var(--neon)}
.site-nav{display:flex;gap:30px;font-size:13px;color:var(--muted)}
.site-nav a{padding:6px 2px;border-bottom:1px solid transparent;transition:.2s;letter-spacing:1px}
.site-nav a:hover{color:var(--neon-2);border-color:var(--neon)}
.lang-btn{background:transparent;border:1px solid var(--line-2);color:var(--neon-2);padding:8px 18px;font-size:12px;letter-spacing:1px;transition:.2s;font-family:var(--mono)}
.lang-btn:hover{border-color:var(--neon);box-shadow:0 0 14px rgba(34,211,238,.25)}

/* ---------- hero ---------- */
.hero{position:relative;background:radial-gradient(900px 480px at 80% -10%,rgba(34,211,238,.10),transparent 60%),radial-gradient(700px 400px at 5% 110%,rgba(129,140,248,.08),transparent 60%),linear-gradient(180deg,#0b101a,var(--bg));overflow:hidden}
.hero::before{content:'';position:absolute;top:0;left:0;right:0;height:1px;background:linear-gradient(90deg,transparent,var(--neon) 35%,var(--neon-2) 50%,var(--neon) 65%,transparent)}
.hero-glow{position:absolute;inset:0;background:radial-gradient(520px 260px at 18% 100%,rgba(34,211,238,.07),transparent 65%)}
.hero-inner{position:relative;display:grid;grid-template-columns:1.12fr 1fr;gap:6%;align-items:center;max-width:1280px;margin:0 auto;padding:80px 5%}
.badge{display:inline-block;font-size:10.5px;letter-spacing:4px;font-weight:600;color:var(--neon-2);border:1px solid rgba(34,211,238,.45);background:rgba(34,211,238,.07);padding:8px 20px;margin:0 0 28px;font-family:var(--mono)}
h1{font-size:clamp(38px,4.4vw,62px);line-height:1.22;letter-spacing:2px;margin:0 0 24px;color:var(--ink);font-weight:800}
h1 .accent{color:var(--neon);text-shadow:0 0 26px rgba(34,211,238,.45)}
.lead{max-width:520px;color:var(--muted);font-size:16px;margin:0 0 36px}
.hero-actions{display:flex;gap:14px;flex-wrap:wrap;margin-bottom:46px}
.btn{display:inline-flex;align-items:center;gap:8px;background:linear-gradient(135deg,#22d3ee,#0891b2);color:#04202a;padding:14px 30px;font-size:13.5px;font-weight:700;letter-spacing:1px;transition:.2s;font-family:var(--sans);box-shadow:0 8px 26px rgba(34,211,238,.28)}
.btn:hover{transform:translateY(-2px);box-shadow:0 12px 32px rgba(34,211,238,.4)}
.btn.ghost{background:transparent;color:var(--neon-2);border:1px solid rgba(34,211,238,.5);box-shadow:none}
.btn.ghost:hover{background:rgba(34,211,238,.08)}
.hero-stats{display:flex;list-style:none;margin:0;padding:0;border:1px solid var(--line);max-width:520px;background:rgba(17,25,39,.75);box-shadow:0 6px 24px rgba(0,0,0,.4)}
.hero-stats li{flex:1;padding:16px 18px;border-right:1px solid var(--line)}
.hero-stats li:last-child{border-right:0}
.hero-stats b{display:block;font-size:19px;color:var(--neon-2);letter-spacing:1px;font-family:var(--mono)}
.hero-stats span{font-size:11.5px;color:var(--muted)}

/* hero visual */
.hero-visual{display:flex;justify-content:center}
.visual-panel{background:linear-gradient(160deg,#101a29,#0b1320);border:1px solid var(--line-2);padding:24px 24px 20px;width:min(100%,360px);box-shadow:0 26px 60px rgba(0,0,0,.55),0 0 40px rgba(34,211,238,.07);position:relative}
.visual-panel::before{content:'';position:absolute;inset:8px;border:1px solid rgba(34,211,238,.16);pointer-events:none}
.visual-head{display:flex;justify-content:space-between;color:#5f7490;font:600 10px/1 var(--mono);letter-spacing:2px;margin-bottom:8px}
.visual-head b{color:var(--neon-2);letter-spacing:4px}
.molecule{display:block;width:100%;height:auto}
.chips{display:flex;gap:8px;justify-content:center;margin-top:12px}
.chips span{font:700 10.5px/1 var(--mono);letter-spacing:2px;color:var(--neon-2);border:1px solid rgba(34,211,238,.4);background:rgba(34,211,238,.06);padding:6px 14px}

/* ---------- rule strip ---------- */
.rulestrip{display:flex;align-items:center;gap:26px;background:var(--bg-2);padding:16px 5%;border-bottom:1px solid var(--line)}
.rulestrip span{flex:1;height:1px;background:linear-gradient(90deg,transparent,rgba(34,211,238,.5),transparent)}
.rulestrip b{color:#5f7490;font:600 10.5px/1 var(--mono);letter-spacing:4px;white-space:nowrap}

/* ---------- sections ---------- */
.section{padding:92px 5%;max-width:1280px;margin:0 auto}
.section.alt{background:var(--bg-2);max-width:none;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.section.alt>*{max-width:1180px;margin-left:auto;margin-right:auto}
.section.alt small{display:block;text-align:center;color:var(--muted);margin-top:36px;font-size:12px}
.eyebrow{font-size:10.5px;letter-spacing:4px;font-weight:600;color:var(--neon);margin:0 0 18px;font-family:var(--mono)}
h2{font-size:clamp(28px,3vw,38px);line-height:1.35;font-weight:800;margin:0 0 20px;color:var(--ink);letter-spacing:1px}
.section-head{display:flex;justify-content:space-between;align-items:flex-end;gap:40px;margin-bottom:42px;flex-wrap:wrap}
.section-head p:last-child{color:var(--muted);font-size:14px;margin:0;max-width:420px}

/* ---------- toolbar ---------- */
.toolbar{display:flex;align-items:center;gap:14px;margin-bottom:30px;flex-wrap:wrap}
.search{display:flex;align-items:center;gap:10px;background:var(--panel);border:1px solid var(--line);padding:12px 18px;flex:1;min-width:240px;max-width:460px;color:var(--neon);transition:.2s}
.search:focus-within{border-color:var(--neon);box-shadow:0 0 0 4px rgba(34,211,238,.12),0 0 18px rgba(34,211,238,.12)}
.search input{border:0;outline:0;background:none;width:100%;font-size:14px;color:var(--ink)}
.search input::placeholder{color:#4d6076}
.mini-btn{background:var(--panel);border:1px solid var(--line);padding:11px 20px;font-size:12.5px;color:var(--muted);transition:.2s}
.mini-btn:hover{color:var(--neon-2);border-color:var(--neon)}
.count{margin-left:auto;font-size:12.5px;color:var(--muted);font-variant-numeric:tabular-nums}

/* ---------- catalog grid ---------- */
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(262px,1fr));gap:20px}
.card{position:relative;text-align:left;background:var(--panel);border:1px solid var(--line);padding:22px 22px 18px;transition:.22s;display:flex;flex-direction:column;gap:8px;box-shadow:0 4px 16px rgba(0,0,0,.35)}
.card::after{content:'';position:absolute;left:22px;right:22px;bottom:0;height:2px;background:linear-gradient(90deg,var(--neon),var(--violet));transform:scaleX(0);transform-origin:left;transition:.25s}
.card:hover{transform:translateY(-4px);box-shadow:0 18px 40px rgba(0,0,0,.55),0 0 24px rgba(34,211,238,.08);border-color:var(--line-2)}
.card:hover::after{transform:scaleX(1)}
.card .number{font:600 10px/1 var(--mono);letter-spacing:2.5px;color:#5f7490}
.card .photo{display:block;margin:2px -4px 6px;background:linear-gradient(160deg,#0f1a29,#0b1220);border:1px solid var(--line)}
.card .photo img{display:block;width:100%;aspect-ratio:1;object-fit:contain;padding:14px;box-sizing:border-box;transition:.25s}
.card:hover .photo img{transform:scale(1.05)}
.card .symbol{position:absolute;top:18px;right:20px;font-size:18px;color:var(--line-2)}
.card h3{margin:0;font-size:16px;line-height:1.45;color:var(--ink);font-weight:700;padding-right:26px}
.card p{margin:0;font-size:13px;color:var(--muted)}
.card .go{margin-top:auto;padding-top:12px;font-size:12.5px;font-weight:700;color:var(--neon-2);display:inline-flex;gap:6px;align-items:center;letter-spacing:.5px}
.card .go span{transition:.2s}
.card:hover .go span{transform:translate(2px,-2px)}

/* ---------- pagination ---------- */
.pagination{display:flex;align-items:center;justify-content:center;gap:20px;margin-top:38px}
.pagination button{background:var(--panel);border:1px solid var(--line);padding:11px 22px;font-size:13px;color:var(--ink);transition:.2s}
.pagination button:hover:not(:disabled){border-color:var(--neon);color:var(--neon-2)}
.pagination span{font-size:13px;color:var(--muted);font-variant-numeric:tabular-nums;font-family:var(--mono)}
.source-note{font-size:12px;color:var(--muted);margin-top:36px;max-width:720px}
#empty{color:var(--muted);text-align:center;padding:40px 0}

/* ---------- documents ---------- */
.doc-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:20px;margin-top:46px}
.doc-grid article{background:var(--panel);border:1px solid var(--line);padding:28px 26px;transition:.2s}
.doc-grid article:hover{border-color:var(--neon);transform:translateY(-3px);box-shadow:0 10px 28px rgba(0,0,0,.45)}
.doc-grid b{display:inline-grid;place-items:center;min-width:54px;height:32px;padding:0 12px;background:rgba(34,211,238,.08);color:var(--neon-2);font:700 11.5px/1 var(--mono);letter-spacing:2px;margin-bottom:20px;border:1px solid rgba(34,211,238,.45)}
.doc-grid h3{margin:0 0 10px;font-size:16px;color:var(--ink)}
.doc-grid p{margin:0;font-size:13.5px;color:var(--muted)}

/* ---------- about ---------- */
.about{display:grid;grid-template-columns:1fr 1fr;gap:7%;align-items:start}
.about p{color:var(--muted);margin:0 0 18px;font-size:15px}
.text-link{display:inline-block;font-size:13.5px;font-weight:700;color:var(--neon-2);border-bottom:1px solid var(--neon);padding-bottom:2px;transition:.2s;letter-spacing:.5px}
.text-link:hover{color:#fff;text-shadow:0 0 14px rgba(34,211,238,.6)}

/* ---------- contact ---------- */
.contact{padding-top:0}
.contact-card{display:flex;justify-content:space-between;align-items:center;gap:40px;background:linear-gradient(140deg,#0f2231,#131a2c);color:var(--muted);padding:56px 6%;position:relative;overflow:hidden;flex-wrap:wrap;border:1px solid var(--line-2);box-shadow:0 18px 44px rgba(0,0,0,.5),0 0 44px rgba(34,211,238,.06)}
.contact-card::before{content:'';position:absolute;inset:10px;border:1px solid rgba(34,211,238,.18);pointer-events:none}
.contact-card::after{content:'';position:absolute;top:-60%;right:-10%;width:420px;height:420px;background:radial-gradient(circle,rgba(34,211,238,.12),transparent 65%);pointer-events:none}
.contact-card>*{position:relative;z-index:1}
.contact-card .eyebrow{color:var(--neon)}
.contact-card h2{color:var(--ink);margin-bottom:12px}
.contact-card p{color:var(--muted);max-width:520px;margin:0;font-size:14.5px}
.wa-button{display:inline-flex;align-items:center;gap:12px;background:#25d366;color:#06351c;font-weight:700;padding:16px 28px;font-size:14px;white-space:nowrap;transition:.2s;box-shadow:0 8px 24px rgba(37,211,102,.32)}
.wa-button:hover{transform:translateY(-2px);box-shadow:0 12px 30px rgba(37,211,102,.45)}
.wa-button.small{padding:11px 20px;font-size:13px;margin:0 0 14px}

/* ---------- floating WhatsApp ---------- */
.wa-float{position:fixed;right:22px;bottom:22px;z-index:50;display:grid;place-items:center;width:58px;height:58px;background:#25d366;color:#fff;box-shadow:0 10px 26px rgba(37,211,102,.45);transition:.2s;border:1px solid rgba(255,255,255,.3)}
.wa-float:hover{transform:scale(1.08)}
.wa-float::before{content:'';position:absolute;inset:-6px;border:1px solid rgba(37,211,102,.5);animation:wa-pulse 2s ease-out infinite}
@keyframes wa-pulse{0%{transform:scale(.85);opacity:1}100%{transform:scale(1.35);opacity:0}}

/* ---------- faq ---------- */
.faq-list{max-width:820px;margin-top:38px;display:flex;flex-direction:column;gap:12px}
.faq-list details{background:var(--panel);border:1px solid var(--line);padding:4px 24px;transition:.2s}
.faq-list details[open]{border-color:var(--neon);box-shadow:0 8px 26px rgba(0,0,0,.4)}
.faq-list summary{cursor:pointer;list-style:none;font-weight:700;color:var(--ink);padding:16px 30px 16px 0;position:relative;font-size:15px}
.faq-list summary::-webkit-details-marker{display:none}
.faq-list summary::after{content:'+';position:absolute;right:2px;top:50%;transform:translateY(-50%);font-size:20px;font-weight:400;color:var(--neon);transition:.2s}
.faq-list details[open] summary::after{transform:translateY(-50%) rotate(45deg)}
.faq-list details p{margin:0 0 18px;color:var(--muted);font-size:14px}

/* ---------- footer ---------- */
.site-footer{background:#070a10;color:var(--muted);margin-top:44px;border-top:1px solid var(--line)}
.site-footer::before{content:'';display:block;height:2px;background:linear-gradient(90deg,transparent,var(--neon),transparent)}
.footer-inner{max-width:1280px;margin:0 auto;padding:64px 5% 36px;display:flex;flex-direction:column;gap:20px}
.footer-brand .brand-text{color:var(--ink)}
.footer-brand .brand-text em{color:var(--neon-2)}
.footer-brand .brand-mark{background:linear-gradient(135deg,#0e2836,#0a1622);color:var(--neon-2);border-color:var(--neon)}
.footer-inner>p{margin:0;font-size:16px;font-style:italic;color:#6f8299}
.footer-bottom{border-top:1px solid var(--line);padding-top:24px;font-size:12.5px;color:#5f7490;display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap}
.footer-bottom a{color:var(--neon-2)}
.footer-bottom a:hover{color:#fff}

/* ---------- dialog ---------- */
dialog{border:0;padding:38px 40px 34px;max-width:520px;width:calc(100% - 40px);color:var(--ink);box-shadow:0 30px 80px rgba(0,0,0,.7),0 0 44px rgba(34,211,238,.1);background:var(--panel-2);border:1px solid var(--line-2)}
dialog::backdrop{background:rgba(4,8,14,.7);backdrop-filter:blur(5px)}
dialog h2{margin:0 0 6px;font-size:24px;color:var(--ink);letter-spacing:0;padding-right:30px}
.detail-photo{display:block;margin:0 0 18px;background:linear-gradient(160deg,#0f1a29,#0b1220);border:1px solid var(--line)}
.detail-photo img{display:block;width:100%;max-height:260px;object-fit:contain;padding:18px;box-sizing:border-box}
.detail-photo small{display:block;text-align:center;font-size:11px;color:var(--muted);padding:0 12px 12px}
dialog strong{display:block;font-size:16px;color:var(--neon-2);margin:0 0 14px}
dialog .source-note{margin:0 0 20px}
dialog a#original{font-size:13.5px;font-weight:700;color:var(--neon-2);border-bottom:1px solid var(--neon)}
#close{position:absolute;top:16px;right:18px;width:34px;height:34px;border:1px solid var(--line);background:var(--panel);color:var(--muted);font-size:18px;line-height:1;transition:.2s}
#close:hover{color:var(--neon-2);border-color:var(--neon)}

/* ---------- responsive ---------- */
@media (max-width:900px){
  .hero-inner{grid-template-columns:1fr;padding:52px 5%;gap:44px}
  .hero-visual{order:-1}
  .visual-panel{width:min(100%,320px)}
  .about{grid-template-columns:1fr}
  .section-head{flex-direction:column;align-items:flex-start;gap:16px}
  .site-nav{display:none}
  .count{margin-left:0;width:100%}
}