:root{--primary:#2563eb;--primary-dark:#1d4ed8;--text:#172033;--muted:#64748b;--bg:#f7f9fc;--card:#fff;--border:#e2e8f0;--success:#0f766e;--danger:#b91c1c}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:Inter,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;color:var(--text);background:var(--bg);line-height:1.65}a{color:var(--primary);text-decoration:none}a:hover{text-decoration:underline}.container{width:min(1100px,92%);margin:auto}
.site-header{background:#fff;border-bottom:1px solid var(--border);position:sticky;top:0;z-index:10}.nav{min-height:68px;display:flex;align-items:center;justify-content:space-between;gap:24px}.logo{font-size:1.35rem;font-weight:800;color:var(--text)}.logo span{color:var(--primary)}nav{display:flex;gap:20px;flex-wrap:wrap}nav a{color:#334155;font-size:.95rem;font-weight:600}
.hero{padding:70px 0 45px;background:linear-gradient(180deg,#eff6ff 0%,var(--bg) 100%);text-align:center}.eyebrow{display:inline-block;font-size:.78rem;font-weight:800;letter-spacing:.12em;color:var(--primary);margin-bottom:12px}.hero h1{font-size:clamp(2.1rem,5vw,3.5rem);line-height:1.1;margin:0 0 14px}.lead{font-size:1.15rem;color:var(--muted);max-width:680px;margin:0 auto 30px}
.calculator-card{background:var(--card);border:1px solid var(--border);border-radius:18px;padding:30px;text-align:left;box-shadow:0 12px 35px rgba(15,23,42,.08);max-width:780px;margin:auto}.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:20px}label{display:block;font-weight:700;margin-bottom:7px}input{width:100%;padding:13px 14px;border:1px solid #cbd5e1;border-radius:10px;font:inherit;background:#fff}input:focus{outline:3px solid #dbeafe;border-color:var(--primary)}small{display:block;color:var(--muted);margin-top:6px}.primary-btn{width:100%;border:0;background:var(--primary);color:#fff;padding:14px 20px;border-radius:10px;font-weight:800;font-size:1rem;cursor:pointer;margin-top:22px}.primary-btn:hover{background:var(--primary-dark)}
.error{margin-top:16px;padding:12px 14px;border-radius:9px;background:#fef2f2;color:var(--danger);border:1px solid #fecaca}.result{margin-top:25px;border-top:1px solid var(--border);padding-top:25px}.result-label{text-align:center;color:var(--muted);margin:0 0 8px}.age-main{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;text-align:center}.age-main>div{background:#f8fafc;border-radius:12px;padding:18px}.age-main strong{display:block;font-size:2.2rem;color:var(--primary);line-height:1.1}.age-main span{color:var(--muted);font-size:.9rem}.details{margin-top:20px;background:#f8fafc;border-radius:12px;padding:14px 18px}.details p{margin:6px 0}
.ad-space{height:110px;margin-top:25px;margin-bottom:25px;border:1px dashed #cbd5e1;background:#fff;border-radius:12px;display:flex;align-items:center;justify-content:center;color:#94a3b8;font-size:.78rem}
.content-section{padding:45px 0 75px;background:#fff}.content-grid{display:grid;grid-template-columns:minmax(0,1fr) 270px;gap:45px}.content-section article{max-width:760px}.content-section h2{font-size:1.55rem;margin-top:34px}.content-section h2:first-child{margin-top:0}.side-card{height:max-content;border:1px solid var(--border);border-radius:14px;padding:20px;background:#f8fafc}.side-card h3{margin-top:0}.side-card a{display:block;padding:8px 0;border-bottom:1px solid var(--border)}
.page{padding:55px 0 80px;background:#fff}.page article{max-width:820px;margin:auto}.page h1{font-size:2.5rem;line-height:1.2}.page h2{margin-top:35px}.page li{margin:8px 0}.notice{padding:16px;border-left:4px solid var(--primary);background:#eff6ff;border-radius:5px}
footer{background:#0f172a;color:#cbd5e1;padding:40px 0 18px}footer a{color:#cbd5e1;display:block;margin:5px 0}.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr;gap:30px}.copyright{border-top:1px solid #334155;margin-top:28px;padding-top:18px;font-size:.85rem;color:#94a3b8}
@media(max-width:720px){.nav{align-items:flex-start;padding:14px 0;flex-direction:column}nav{gap:10px 14px}.hero{padding-top:45px}.form-grid,.content-grid,.footer-grid{grid-template-columns:1fr}.calculator-card{padding:20px}.age-main strong{font-size:1.7rem}.page h1{font-size:2rem}}