:root{
  --teal:#0f766e; --teal-2:#14b8a6; --amber:#f59e0b; --amber-d:#b45309;
  --bg:#f7faf9; --card:#ffffff; --ink:#0f172a; --muted:#64748b; --line:#e2e8f0;
  --green:#16a34a; --yellow:#ca8a04; --orange:#ea580c; --red:#dc2626;
  --shadow:0 6px 20px rgba(15,118,110,.08);
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;color:var(--ink);background:var(--bg);line-height:1.75;font-size:16px}
a{color:var(--teal);text-decoration:none}
.wrap{max-width:1040px;margin:0 auto;padding:0 20px}
/* NAV */
header.nav{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.92);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
.nav-in{display:flex;align-items:center;gap:14px;min-height:60px}
.brand{order:1;flex:none;white-space:nowrap;font-weight:800;color:var(--teal);font-size:18px;display:flex;align-items:center;gap:8px}
.brand .dot{width:12px;height:12px;border-radius:50%;background:var(--amber)}
nav.links{order:2;display:flex;gap:10px;flex:1 1 auto;min-width:0;flex-wrap:wrap;justify-content:center;font-size:14px}
nav.links a{color:var(--muted);padding:4px 6px;border-radius:6px;white-space:nowrap}
nav.links a:hover{color:var(--teal);background:#ecfdf5}
/* LANGUAGE SWITCH */
.lang-switch{order:3;flex:none;display:flex;gap:6px;align-items:center}
.lang-switch a{font-size:13px;padding:4px 9px;border-radius:7px;color:var(--muted);border:1px solid var(--line);font-weight:600}
.lang-switch a:hover{color:var(--teal);background:#ecfdf5;border-color:var(--teal-2)}
.lang-switch a.active{color:#fff;background:var(--teal);border-color:var(--teal)}
/* HERO */
.hero{background:linear-gradient(135deg,#0f766e 0%,#14b8a6 60%,#0d9488 100%);color:#fff;padding:64px 0 56px}
.hero h1{font-size:38px;line-height:1.25;margin-bottom:14px;font-weight:800}
.hero p.lead{font-size:18px;opacity:.95;max-width:680px}
.hero .tag{display:inline-block;margin-top:18px;background:rgba(255,255,255,.16);border:1px solid rgba(255,255,255,.3);padding:8px 16px;border-radius:999px;font-size:15px}
.hero .cta{margin-top:24px;display:flex;gap:12px;flex-wrap:wrap}
.btn{display:inline-block;padding:12px 22px;border-radius:10px;font-weight:700;font-size:15px}
.btn-amber{background:var(--amber);color:#3b2c00}
.btn-ghost{border:1px solid rgba(255,255,255,.6);color:#fff}
/* SECTION */
section{padding:52px 0;border-bottom:1px solid var(--line)}
.sec-h{display:flex;align-items:center;gap:12px;margin-bottom:8px}
.sec-h .num{background:var(--teal);color:#fff;width:34px;height:34px;border-radius:9px;display:flex;align-items:center;justify-content:center;font-weight:800;font-size:15px;flex:none}
h2{font-size:26px;color:var(--teal)}
.sub{color:var(--muted);margin-bottom:22px;font-size:15px}
.card{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:22px;box-shadow:var(--shadow);margin:16px 0}
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:18px}
.grid3{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
@media(max-width:820px){.grid2,.grid3{grid-template-columns:1fr}.hero h1{font-size:30px}nav.links{display:none}}
figure{margin:0}
figure img{width:100%;border-radius:12px;border:1px solid var(--line);display:block;background:#fff}
figcaption{font-size:13px;color:var(--muted);margin-top:8px;text-align:center}
table{width:100%;border-collapse:collapse;margin:14px 0;font-size:14px;background:var(--card);border-radius:10px;overflow:hidden;box-shadow:var(--shadow)}
th,td{border:1px solid var(--line);padding:9px 11px;text-align:left;vertical-align:top}
th{background:#ecfdf5;color:var(--teal);font-weight:700}
ul,ol{margin:10px 0 10px 22px}
li{margin:5px 0}
.pill{display:inline-block;padding:2px 10px;border-radius:999px;font-size:13px;font-weight:700}
.p-red{background:#fee2e2;color:var(--red)} .p-orange{background:#ffedd5;color:var(--orange)}
.p-yellow{background:#fef9c3;color:var(--yellow)} .p-green{background:#dcfce7;color:var(--green)}
.p-teal{background:#ccfbf1;color:var(--teal)} .p-amber{background:#fef3c7;color:var(--amber-d)}
.callout{border-left:4px solid var(--teal);background:#ecfdf5;padding:14px 16px;border-radius:0 10px 10px 0;margin:14px 0;font-size:15px}
.warn{border-left-color:var(--orange);background:#fff7ed}
.danger{border-left-color:var(--red);background:#fef2f2}
.check{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;background:#0f172a;color:#e2e8f0;padding:14px 16px;border-radius:10px;font-size:13.5px;line-height:1.7;overflow-x:auto;white-space:pre}
.chart{font-family:ui-monospace,monospace;font-size:13.5px;background:#f8fafc;border:1px solid var(--line);border-radius:10px;padding:12px 14px;line-height:1.7}
.badge-row{display:flex;gap:10px;flex-wrap:wrap;margin:10px 0}
.footer{background:#0f172a;color:#cbd5e1;padding:40px 0;font-size:14px}
.footer a{color:#5eead4}
.formula{display:block;background:#f1f5f9;border:1px dashed var(--teal);border-radius:10px;padding:12px 14px;margin:8px 0;font-size:14px}