:root{--bg:#f4f9ff;--card:#fff;--ink:#0f172a;--text:#334155;--muted:#64748b;--line:#e2e8f0;
--brand:#0ea5e9;--brand-ink:#0369a1;--lime:#a3e635;--danger:#dc2626;--danger-ink:#b91c1c;--radius:16px}
*{box-sizing:border-box}html,body{margin:0}html{scroll-behavior:smooth}
body{font-family:system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;background:var(--bg);color:var(--ink);
line-height:1.65;min-height:100vh;display:flex;flex-direction:column;-webkit-font-smoothing:antialiased}
a{color:var(--brand-ink);text-underline-offset:2px}
:focus-visible{outline:3px solid #7dd3fc;outline-offset:2px;border-radius:6px}

/* header */
.top{position:sticky;top:0;z-index:10;background:rgba(244,249,255,.85);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.top-in{max-width:1040px;margin:0 auto;padding:12px 20px;display:flex;align-items:center;justify-content:space-between;gap:16px}
.brand{display:inline-flex;align-items:center;gap:10px;text-decoration:none;color:var(--ink);font-weight:800;letter-spacing:-.01em}
.brand img{width:34px;height:34px}
.top nav a{color:var(--text);text-decoration:none;font-size:.95rem;font-weight:500;padding:8px 12px;border-radius:999px}
.top nav a:hover,.top nav a[aria-current]{background:#e0f2fe;color:var(--brand-ink)}

/* document pages */
main{flex:1;width:100%;max-width:780px;margin:0 auto;padding:32px 20px 64px}
.doc{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:40px 44px;box-shadow:0 1px 2px rgba(15,23,42,.04),0 8px 24px rgba(15,23,42,.04)}
.doc h1{font-size:2rem;line-height:1.2;margin:0 0 6px;letter-spacing:-.02em}
.doc h1+p.muted,.doc h1+.muted{margin-top:0}
.doc h2{font-size:1.15rem;margin:2.2rem 0 .5rem;padding-top:1.4rem;border-top:1px solid var(--line);scroll-margin-top:80px}
.doc h3{font-size:1rem;margin:1.4rem 0 .3rem}
.doc p,.doc li{color:var(--text)}.doc ul{padding-left:1.25rem}.doc li{margin-bottom:.35rem}
.muted{color:var(--muted);font-size:.9rem}
.callout{background:#f0f9ff;border:1px solid #bae6fd;border-radius:12px;padding:14px 16px;color:var(--text)}
.toc{background:#f8fafc;border:1px solid var(--line);border-radius:12px;padding:14px 18px;margin:20px 0 8px}
.toc strong{display:block;font-size:.8rem;text-transform:uppercase;letter-spacing:.06em;color:var(--muted);margin-bottom:6px}
.toc ol{margin:0;padding-left:1.2rem;columns:2;column-gap:28px;font-size:.92rem}.toc li{margin:0 0 4px;break-inside:avoid}
.toc a{color:var(--text);text-decoration:none}.toc a:hover{color:var(--brand-ink);text-decoration:underline}

/* contact cards */
.cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:12px;margin:16px 0 8px}
.card{border:1px solid var(--line);border-radius:12px;padding:16px;background:#fbfdff}
.card b{display:block;margin-bottom:2px}.card span{display:block;color:var(--muted);font-size:.88rem;margin-bottom:8px}
.card a{font-weight:600;word-break:break-all}

/* form */
.form{margin-top:24px;padding-top:24px;border-top:1px solid var(--line);display:grid;gap:18px}
.field label{display:block;font-weight:600;margin-bottom:6px}
.field .hint{font-weight:400;color:var(--muted);font-size:.88rem}
.field input,.field textarea{width:100%;font:inherit;color:var(--ink);background:#fff;border:1px solid #cbd5e1;border-radius:10px;padding:12px 14px;transition:border-color .15s,box-shadow .15s}
.field textarea{resize:vertical;min-height:96px}
.field input:focus,.field textarea:focus{outline:none;border-color:var(--brand);box-shadow:0 0 0 4px #e0f2fe}
.check{display:flex;gap:10px;align-items:flex-start;cursor:pointer;color:var(--text)}
.check input{width:20px;height:20px;margin:2px 0 0;accent-color:var(--danger);flex:none}
.btn{font:inherit;font-weight:700;border:0;border-radius:999px;padding:13px 22px;cursor:pointer;justify-self:start;transition:background .15s,transform .05s}
.btn:active{transform:translateY(1px)}
.btn-danger{background:var(--danger);color:#fff}.btn-danger:hover{background:var(--danger-ink)}
.btn[disabled]{opacity:.55;cursor:not-allowed}
.msg{border-radius:12px;padding:12px 16px;margin:0}.msg:empty{display:none}
.msg.ok{background:#f0fdf4;border:1px solid #bbf7d0;color:#166534}
.msg.err{background:#fef2f2;border:1px solid #fecaca;color:#991b1b}
.msg.wait{background:#f8fafc;border:1px solid var(--line);color:var(--text)}
.after-form{margin-top:28px}

/* home */
.hero{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;
padding:64px 20px;gap:18px;background:radial-gradient(60% 50% at 50% 35%,#e0f2fe 0%,rgba(224,242,254,0) 70%)}
.hero img{width:168px;height:168px;filter:drop-shadow(0 18px 30px rgba(14,165,233,.28));animation:float 5s ease-in-out infinite}
.hero h1{margin:8px 0 0;font-size:clamp(2.4rem,6vw,3.4rem);letter-spacing:-.03em;line-height:1.05}
.hero p{margin:0;font-size:clamp(1.1rem,2.4vw,1.3rem);color:var(--muted);max-width:32ch}
@keyframes float{0%,100%{transform:translateY(0)}50%{transform:translateY(-8px)}}
@media (prefers-reduced-motion:reduce){.hero img{animation:none}html{scroll-behavior:auto}}

/* footer */
footer{border-top:1px solid var(--line);background:#fff}
.foot-in{max-width:1040px;margin:0 auto;padding:22px 20px;display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:12px 24px;font-size:.9rem;color:var(--muted)}
footer nav{display:flex;flex-wrap:wrap;gap:6px 18px}
footer a{color:var(--text);text-decoration:none}footer a:hover{color:var(--brand-ink);text-decoration:underline}

@media (max-width:640px){
 .doc{padding:26px 20px;border-radius:14px}.doc h1{font-size:1.6rem}
 main{padding:20px 14px 48px}.toc ol{columns:1}
 .top nav a{padding:6px 8px}.btn{justify-self:stretch}
 .foot-in{flex-direction:column;text-align:center}footer nav{justify-content:center}
}