:root{--bg:#ffffff;--ink:#0b0f16;--muted:#657082;--accent:#0b63ff;--line:#e8edf5}
*{box-sizing:border-box}
html,body{margin:0;padding:0;background:var(--bg);color:var(--ink);font-family:system-ui,-apple-system,Segoe UI,Roboto,Inter,Arial,sans-serif}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}
.container{max-width:1120px;margin:0 auto;padding:24px 16px}
.topbar{position:sticky;top:0;background:#fff;border-bottom:1px solid var(--line);z-index:10}
.nav{display:flex;gap:16px;align-items:center;justify-content:space-between}
.brand{display:flex;align-items:center;gap:10px}
.brand img{width:44px;height:44px;border-radius:50%;object-fit:cover;border:1px solid var(--line)}
.brand h1{font-size:18px;margin:0}
nav a{font-weight:700}
.hero{border-bottom:1px solid var(--line);background:linear-gradient(180deg,#f7f9fc,transparent)}
.hero .inner{display:grid;grid-template-columns:1fr;gap:12px;padding:28px 0}
.hero h2{font-size:clamp(26px,6vw,38px);margin:0}
.hero p{margin:0;color:var(--muted)}
.buttons{display:flex;flex-wrap:wrap;gap:10px;margin-top:12px}
.btn{display:inline-block;border:1px solid var(--line);background:#fff;padding:12px 16px;border-radius:10px;font-weight:800}
.btn.primary{background:var(--accent);color:#fff;border-color:var(--accent)}
.section{padding:28px 0;border-bottom:1px solid var(--line)}
h3{margin:0 0 8px 0;font-size:22px}
.viewer{display:none}
@media(min-width:960px){.viewer{display:block;margin-top:12px} .viewer iframe{width:100%;height:78vh;border:1px solid var(--line);border-radius:10px;background:#fff}}
.card{border:1px solid var(--line);border-radius:12px;padding:16px;background:#fff}
footer{padding:28px 0;text-align:center;color:var(--muted)}
.biglist{list-style:disc;padding-left:20px}
.note{border-left:4px solid var(--accent);padding:10px 12px;background:#f7faff;border:1px solid var(--line);border-radius:8px}