:root{--bg:#f4f6fa;--surface:#fff;--ink:#0f172a;--muted:#64748b;--line:#e2e8f0;--primary:#047857;--primary-dark:#065f46;--primary-soft:#ecfdf5;--accent:#d97706;--danger:#b91c1c;--radius:14px;--radius-sm:10px;--shadow:0 1px 2px rgba(15,23,42,.06),0 12px 32px -16px rgba(15,23,42,.22)}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--ink);font:17px/1.75 system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif}
.wrap{max-width:860px;margin:0 auto;padding:0 20px}
.site-header{position:sticky;top:0;z-index:20;background:#fff;box-shadow:0 1px 0 var(--line),0 6px 20px -12px rgba(15,23,42,.2)}
.bar{display:flex;align-items:center;justify-content:space-between;height:66px;max-width:960px;margin:0 auto;padding:0 20px}
.brand{display:flex;align-items:center;gap:12px;text-decoration:none;color:var(--ink)}
.mark-img{width:40px;height:40px;border-radius:14px;display:block;flex:none}
.word{font-size:17px;font-weight:700}
nav a{margin-left:22px;color:var(--muted);text-decoration:none;font-weight:600;font-size:15px}
nav a:hover,nav a.on{color:var(--primary)}
.crumbs{padding:22px 0 0;font-size:14px;color:var(--muted)}
.crumbs a{color:var(--primary);text-decoration:none;font-weight:600}
.crumbs span{margin:0 8px}
article{background:var(--surface);border-radius:18px;box-shadow:var(--shadow);padding:44px;margin:18px 0 26px}
.meta{display:flex;flex-wrap:wrap;gap:10px;align-items:center;margin-bottom:18px;font-size:14px;color:var(--muted)}
.meta .tag{background:var(--primary-soft);color:var(--primary-dark);font-weight:700;padding:4px 12px;border-radius:999px}
h1{font-size:clamp(30px,5vw,42px);line-height:1.2;margin:0 0 16px;font-weight:800;letter-spacing:-.02em}
.lead{font-size:19px;color:var(--muted);margin:0 0 8px;max-width:68ch}
article h2{font-size:26px;margin:44px 0 16px;letter-spacing:-.01em;padding-top:8px}
article h2 .n{display:inline-grid;place-items:center;width:36px;height:36px;border-radius:50%;background:var(--primary);color:#fff;font-size:18px;margin-right:12px;vertical-align:middle}
article p{margin:0 0 18px;max-width:72ch}
article ul,article ol{margin:0 0 18px;padding-left:24px;max-width:70ch}
article li{margin-bottom:8px}
.formula{background:var(--primary-soft);border-left:4px solid var(--primary);border-radius:0 12px 12px 0;padding:16px 20px;font-weight:700;font-size:18px;margin:22px 0}
table{width:100%;border-collapse:collapse;margin:22px 0;font-size:15.5px;background:#fff;border-radius:12px;overflow:hidden;box-shadow:var(--shadow)}
th{background:var(--ink);color:#fff;text-align:left;padding:12px 16px;font-weight:700}
td{padding:12px 16px;border-bottom:1px solid var(--line)}
tr:last-child td{border-bottom:0}
tr:nth-child(even) td{background:#f8fafc}
.badge{display:inline-block;padding:3px 12px;border-radius:999px;font-size:13.5px;font-weight:700}
.badge.ok{background:var(--primary-soft);color:var(--primary-dark)}
.badge.no{background:#fef2f2;color:var(--danger)}
figure{margin:28px 0;background:#fff;border-radius:14px;box-shadow:var(--shadow);padding:18px}
figure img{width:100%;height:auto;border-radius:8px;display:block}
figcaption{font-size:14px;color:var(--muted);margin-top:12px;text-align:center}
.callout{background:#fffbeb;border:1.5px solid #fcd34d;border-radius:12px;padding:18px 22px;margin:24px 0}
.callout strong{color:#92400e}
.disclaimer{background:#f8fafc;border:1.5px dashed var(--line);border-radius:12px;padding:16px 20px;font-size:14.5px;color:var(--muted);margin:24px 0}
.cta{background:linear-gradient(135deg,var(--primary),var(--primary-dark));border-radius:18px;padding:36px;color:#fff;text-align:center;margin:36px 0;box-shadow:var(--shadow)}
.cta h3{margin:0 0 10px;font-size:24px}
.cta p{margin:0 0 22px;color:#d1fae5;max-width:52ch;margin-left:auto;margin-right:auto}
.cta .btn{display:inline-block;background:#fff;color:var(--primary-dark);font-weight:800;padding:14px 32px;border-radius:12px;text-decoration:none;font-size:17px}
.cta .btn:hover{transform:translateY(-2px);box-shadow:0 12px 24px -10px rgba(0,0,0,.4)}
details{background:#fff;border-radius:var(--radius-sm);box-shadow:var(--shadow);margin-bottom:10px}
summary{list-style:none;cursor:pointer;padding:16px 56px 16px 20px;font-weight:700;position:relative}
summary::-webkit-details-marker{display:none}
summary::after{content:"+";position:absolute;right:20px;top:50%;transform:translateY(-50%);width:28px;height:28px;border-radius:50%;background:var(--primary-soft);color:var(--primary);display:grid;place-items:center;font-size:20px;line-height:1;transition:transform .25s}
details[open] summary::after{content:"−";transform:translateY(-50%) rotate(180deg)}
details p{margin:0;padding:0 20px 18px;color:var(--muted)}
.faq{margin:10px 0 30px}
.related{background:var(--surface);border-radius:16px;box-shadow:var(--shadow);padding:28px;margin-bottom:44px}
.related h2{font-size:20px;margin:0 0 16px}
.rel-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:12px}
.rel-grid a{background:var(--bg);padding:16px;border-radius:var(--radius-sm);text-decoration:none;color:var(--ink);font-weight:600;display:block}
.rel-grid a span{display:block;font-weight:400;font-size:14px;color:var(--muted);margin-top:4px}
.rel-grid a:hover{color:var(--primary)}
.site-footer{background:var(--ink);color:#cbd5e1;padding:32px 0;font-size:14px}
.site-footer .wrap{max-width:960px}
.site-footer a{color:#fff}
.ext{font-size:.85em}
@media(max-width:600px){nav{display:none}article{padding:26px 20px}.cta{padding:26px 20px}}