:root{--bg:#fff;--text:#1f2937;--muted:#6b7280;--line:#e5e7eb;--card:#f8fafc;--blue:#1d4ed8;--blue2:#eff6ff;--green:#166534;--amber:#92400e;--shadow:0 10px 30px rgba(2,8,23,.06)}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,Arial,sans-serif;color:var(--text);background:var(--bg);line-height:1.6}
a{color:var(--blue);text-decoration:none}a:hover{text-decoration:underline}
.container{max-width:1120px;margin:0 auto;padding:0 18px}.narrow{max-width:820px}
.site-header{position:sticky;top:0;z-index:20;background:rgba(255,255,255,.95);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.header-inner{display:flex;justify-content:space-between;align-items:center;min-height:64px}.brand{font-weight:800;color:var(--text);font-size:1.1rem}.brand:hover{text-decoration:none}.nav{display:flex;flex-wrap:wrap;gap:16px;align-items:center}.nav a{color:#334155;font-weight:600;font-size:.95rem}
.hero{padding:56px 0;background:linear-gradient(180deg,#f8fbff 0%,#fff 100%);border-bottom:1px solid var(--line)}
.hero h1{font-size:clamp(2rem,5vw,3.7rem);line-height:1.05;margin:0 0 14px}.hero p{font-size:1.15rem;color:var(--muted);max-width:760px;margin:0 0 24px}.cta-row{display:flex;flex-wrap:wrap;gap:12px}
.btn{display:inline-block;padding:12px 18px;border-radius:12px;background:var(--blue);color:#fff;font-weight:700;border:1px solid var(--blue);box-shadow:var(--shadow)}.btn:hover{text-decoration:none;filter:brightness(.98)}.btn.secondary{background:#fff;color:var(--blue)}
.section{padding:40px 0}.muted{background:#f8fafc;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.grid{display:grid;gap:18px}.grid.cards{grid-template-columns:repeat(auto-fit,minmax(230px,1fr))}.card{background:#fff;border:1px solid var(--line);border-radius:18px;padding:20px;box-shadow:var(--shadow)}.card h3{margin:.2rem 0 .5rem}.card p{margin:.35rem 0;color:var(--muted)}
.tool-card{display:flex;flex-direction:column;gap:10px}.tag{display:inline-block;padding:5px 10px;border-radius:999px;background:var(--blue2);color:var(--blue);font-size:.84rem;font-weight:700}
.two-col{display:grid;grid-template-columns:1.2fr .8fr;gap:24px}.sticky{position:sticky;top:88px}
form .row{display:grid;grid-template-columns:1fr 1fr;gap:14px}label{display:block;font-weight:700;margin-bottom:6px}input,select,textarea{width:100%;padding:11px 12px;border:1px solid #cbd5e1;border-radius:12px;background:#fff;color:var(--text);font-size:1rem}textarea{min-height:130px}
.help{font-size:.9rem;color:var(--muted);margin-top:5px}.result{background:#f8fffb;border:1px solid #bbf7d0;border-radius:18px;padding:18px}.result h2,.result h3{margin-top:0}.list{padding-left:18px;margin:.4rem 0}.list li{margin:.25rem 0}
.amazon-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(210px,1fr));gap:12px}.amazon{display:block;padding:14px;border:1px solid #fde68a;background:#fffbeb;border-radius:14px;color:#92400e;font-weight:700}.amazon:hover{text-decoration:none;background:#fff7d6}
.notice{background:#fff7ed;border:1px solid #fdba74;padding:14px;border-radius:14px;color:#9a3412}.faq details{border-top:1px solid var(--line);padding:14px 0}.faq summary{font-weight:700;cursor:pointer}
.bullets{display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:14px}.bullets .item{display:flex;gap:10px}.dot{width:10px;height:10px;background:#2563eb;border-radius:999px;flex:none;margin-top:9px}
.site-footer{border-top:1px solid var(--line);background:#f8fafc;margin-top:40px}.footer-grid{display:grid;grid-template-columns:1.1fr .9fr .9fr;gap:18px;padding:36px 0}.small{font-size:.93rem;color:var(--muted)}.copyright{text-align:center;border-top:1px solid var(--line);padding:18px 0;color:var(--muted);font-size:.92rem}
.prose h1{font-size:2.2rem;line-height:1.15}.prose h2{margin-top:1.7rem}.prose p,.prose li{color:#334155}.breadcrumbs{font-size:.9rem;color:var(--muted);margin-bottom:12px}.related{display:flex;flex-wrap:wrap;gap:10px}.related a{padding:8px 12px;border:1px solid var(--line);border-radius:999px;background:#fff;color:#334155;font-weight:600}
@media (max-width:900px){.two-col,.footer-grid{grid-template-columns:1fr}.sticky{position:static}.header-inner{padding:10px 0}.nav{gap:10px}.hero{padding:42px 0}form .row{grid-template-columns:1fr}}