:root{--bg:#faf7f2;--card:#fffdfa;--text:#272320;--muted:#6b6258;--soft:#4a423a;--border:rgba(64,52,40,.12);--accent:#0f766e;--accent-d:#115e56;--radius:16px}
*{box-sizing:border-box}
body{margin:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif;color:var(--text);background:var(--bg);
background-image:radial-gradient(circle at 15% 12%,rgba(255,224,199,.4),transparent 46%),radial-gradient(circle at 88% 14%,rgba(94,234,212,.16),transparent 46%);line-height:1.65;-webkit-font-smoothing:antialiased}
a{color:var(--accent);text-decoration:none}a:hover{text-decoration:underline}
.site-header{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:8px;max-width:820px;margin:0 auto;padding:14px 20px}
.brand{display:flex;align-items:center;gap:8px;font-weight:800;color:var(--text)}
.topnav{display:flex;align-items:center;gap:16px;font-size:14px;font-weight:600;flex-wrap:wrap}
.topnav a{color:var(--soft)}
main{max-width:820px;margin:0 auto;padding:8px 20px 48px}
.crumbs{font-size:13px;color:var(--muted);margin:4px 0 12px}
h1{font-size:clamp(26px,5vw,38px);line-height:1.15;margin:.2em 0}
h2{font-size:22px;margin:1.7em 0 .4em}
h3{font-size:18px;margin:1.3em 0 .3em}
.intro{font-size:18px;color:var(--soft)}
.content p,.content li{font-size:16.5px}
.content ul,.content ol{padding-left:1.2em}
.content table{width:100%;border-collapse:collapse;margin:1em 0;font-size:15px}
.content th,.content td{border:1px solid var(--border);padding:8px 10px;text-align:left}
.content th{background:rgba(15,118,110,.07)}
.content .steps{counter-reset:s;list-style:none;padding-left:0}
.content .steps li{counter-increment:s;position:relative;padding-left:38px;margin:.5em 0}
.content .steps li::before{content:counter(s);position:absolute;left:0;top:0;width:26px;height:26px;border-radius:50%;background:var(--accent);color:#fff;font-weight:700;font-size:13px;display:grid;place-items:center}
.calc-card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:20px;margin:20px 0;box-shadow:0 12px 28px -14px rgba(60,45,30,.16)}
.calc-form .unit-row{display:flex;gap:16px;font-size:14px;margin-bottom:14px;color:var(--muted);flex-wrap:wrap}
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.calc-form label{display:flex;flex-direction:column;gap:4px;font-size:13px;font-weight:600;color:var(--muted)}
.calc-form .span2{grid-column:1/-1}
.calc-form input,.calc-form select{margin-top:2px;padding:10px 12px;border:1px solid var(--border);border-radius:10px;background:#fff;font-size:16px;color:var(--text)}
.btn{display:inline-block;margin-top:14px;background:var(--accent);color:#fff;border:0;border-radius:12px;padding:11px 18px;font-size:15px;font-weight:700;cursor:pointer}
.btn:hover{background:var(--accent-d);text-decoration:none;color:#fff}
.btn-ghost{background:transparent;color:var(--accent);border:1px solid var(--border);margin:0;padding:7px 13px;font-size:14px}
.result{display:none;margin-top:16px;padding:14px 16px;border-radius:12px;background:rgba(15,118,110,.08);border:1px solid rgba(15,118,110,.2);font-size:18px}
.result.show{display:block}
.sleep-list,.result ul{margin:.4em 0 0}
.faq details{border:1px solid var(--border);border-radius:12px;padding:12px 16px;margin:8px 0;background:var(--card)}
.faq summary{font-weight:700;cursor:pointer}
.faq p{margin:.6em 0 0;color:var(--soft)}
.related{margin-top:28px}
.rel-grid{display:flex;flex-wrap:wrap;gap:10px}
.rel-grid a{border:1px solid var(--border);background:var(--card);border-radius:10px;padding:8px 14px;font-weight:600;font-size:14px}
.hub-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:14px;margin:18px 0}
.hub-card{display:flex;flex-direction:column;gap:4px;border:1px solid var(--border);background:var(--card);border-radius:var(--radius);padding:16px;color:var(--text)}
.hub-card:hover{border-color:var(--accent);text-decoration:none}
.hub-card strong{font-size:16px}
.hub-card span{font-size:13px;color:var(--muted);line-height:1.45}
.cta{margin-top:36px;text-align:center;background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:28px 20px}
.site-footer{max-width:820px;margin:0 auto;padding:24px 20px 48px;color:var(--muted);font-size:13px;text-align:center}
.foot-nav{display:flex;flex-wrap:wrap;gap:16px;justify-content:center;margin-bottom:12px;font-weight:600}
.disclaimer{font-size:12px;margin-top:8px}
@media(max-width:560px){.grid2{grid-template-columns:1fr}}