:root{--brand:#0f766e;--brand2:#14b8a6;--ink:#1e293b;--muted:#64748b;--bg:#f8fafc;--card:#fff;--line:#e2e8f0;--radius:14px}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;color:var(--ink);background:var(--bg);line-height:1.65;font-size:17px}
.wrap{max-width:1080px;margin:0 auto;padding:0 20px}
.site-header{background:var(--brand);position:sticky;top:0;z-index:50;box-shadow:0 2px 10px rgba(0,0,0,.15)}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:60px}
.logo{color:#fff;font-size:1.4rem;font-weight:800;text-decoration:none;letter-spacing:-.5px}
.main-nav{display:flex;gap:6px}
.main-nav a{color:#e6fffa;text-decoration:none;padding:8px 12px;border-radius:8px;font-size:.95rem;font-weight:600}
.main-nav a:hover{background:rgba(255,255,255,.15);color:#fff}
.nav-toggle{display:none;background:none;border:none;color:#fff;font-size:1.6rem;cursor:pointer}
.hero{background:linear-gradient(135deg,#0f766e,#134e4a);color:#fff;padding:70px 20px;text-align:center;border-radius:0 0 30px 30px}
.hero h1{font-size:2.4rem;max-width:760px;margin:0 auto 14px;letter-spacing:-1px}
.hero p{font-size:1.15rem;opacity:.92;max-width:640px;margin:0 auto}
.cats{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin:40px 0}
.cat-card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:26px;text-decoration:none;color:var(--ink);transition:.2s;display:block}
.cat-card:hover{transform:translateY(-4px);box-shadow:0 12px 30px rgba(15,118,110,.15);border-color:var(--brand2)}
.cat-card h3{color:var(--brand);margin-bottom:8px}
.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;margin:30px 0 50px}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;transition:.2s;display:block;text-decoration:none;color:var(--ink)}
.card:hover{transform:translateY(-4px);box-shadow:0 12px 30px rgba(15,118,110,.14)}
.card-img{height:130px;display:flex;align-items:center;justify-content:center;font-size:2.6rem;font-weight:800;color:#fff}
.card-body{padding:18px 20px}
.card-body h2,.card-body h3{font-size:1.15rem;line-height:1.35;margin-bottom:8px}
.card-body p{color:var(--muted);font-size:.92rem}
.section-title{font-size:1.6rem;margin:44px 0 6px;letter-spacing:-.5px}
.breadcrumb{font-size:.85rem;color:var(--muted);margin:20px 0}
.breadcrumb a{color:var(--brand);text-decoration:none}
article.post{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:34px 40px;margin-bottom:40px}
article.post h1{font-size:2rem;letter-spacing:-.8px;line-height:1.25;margin-bottom:10px}
.post-meta{color:var(--muted);font-size:.88rem;margin-bottom:22px}
.post-body h2{font-size:1.4rem;margin:32px 0 12px;color:var(--brand)}
.post-body h3{font-size:1.15rem;margin:24px 0 10px}
.post-body p{margin-bottom:16px}
.post-body ul,.post-body ol{margin:0 0 18px 24px}
.post-body li{margin-bottom:8px}
.callout{background:#ecfeff;border-left:4px solid var(--brand2);padding:14px 18px;border-radius:0 10px 10px 0;margin:20px 0}
.tags{margin:26px 0 6px}
.tags a{display:inline-block;background:#f0fdfa;color:var(--brand);border:1px solid #99f6e4;padding:5px 14px;border-radius:999px;font-size:.85rem;text-decoration:none;margin:0 6px 8px 0;font-weight:600}
.tags a:hover{background:var(--brand);color:#fff}
.faq details{background:#f8fafc;border:1px solid var(--line);border-radius:10px;padding:14px 18px;margin-bottom:10px}
.faq summary{font-weight:700;cursor:pointer;color:var(--brand)}
.faq p{margin-top:10px;color:var(--ink)}
.related{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin:34px 0}
.site-footer{background:#0b3d38;color:#cbd5e1;margin-top:60px;padding:46px 0 24px}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr;gap:30px}
.site-footer a{display:block;color:#99f6e4;text-decoration:none;margin:6px 0;font-size:.92rem}
.site-footer a:hover{color:#fff}
.site-footer p{font-size:.9rem;margin-top:8px}
.copy{border-top:1px solid rgba(255,255,255,.12);margin-top:30px;padding-top:18px;font-size:.85rem;color:#7dd3c8;text-align:center}
.page-box{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:34px 40px;margin:30px 0 50px}
.page-box h1{font-size:1.9rem;margin-bottom:14px;letter-spacing:-.5px}
.page-box h2{font-size:1.25rem;margin:24px 0 10px;color:var(--brand)}
.page-box p,.page-box li{margin-bottom:12px}
.page-box ul{margin-left:22px}
@media(max-width:860px){.grid,.cats,.related{grid-template-columns:1fr 1fr}.footer-grid{grid-template-columns:1fr 1fr}}
@media(max-width:600px){.grid,.cats,.related{grid-template-columns:1fr}.main-nav{display:none;position:absolute;top:60px;left:0;right:0;background:var(--brand);flex-direction:column;padding:12px}.main-nav.open{display:flex}.nav-toggle{display:block}.hero h1{font-size:1.7rem}article.post{padding:24px}}