:root {
  --bg: #090909;
  --bg-soft: #101010;
  --line: #252525;
  --line-soft: #333;
  --text: #f5f5f5;
  --muted: #b9b9b9;
  --soft: #8b8b8b;
  --max: 1180px;
  --radius: 14px;
}
* { box-sizing: border-box; min-width: 0; }
html, body { margin: 0; padding: 0; }
body {
  font-family: "Helvetica Neue", "PingFang SC", "Noto Sans SC", sans-serif;
  color: var(--text);
  background:
    radial-gradient(1200px 500px at 100% -10%, #191919 0, transparent 58%),
    radial-gradient(900px 600px at -20% 120%, #141414 0, transparent 60%),
    var(--bg);
  line-height: 1.7;
  overflow-x: hidden;
}
a { color: var(--text); text-decoration: none; }
a:hover { opacity: .86; }
.container { width: min(var(--max), 92vw); margin: 0 auto; overflow-x: clip; }
.site-header {
  position: sticky; top: 0; z-index: 30;
  background: rgba(9, 9, 9, .84);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}
.nav-wrap { display: flex; align-items: center; justify-content: space-between; padding: 14px 0; }
.logo { display: inline-flex; align-items: center; gap: 10px; font-size: 1.15rem; font-weight: 700; letter-spacing: .05em; text-transform: lowercase; }
.logo-mark { width: 28px; height: 28px; border-radius: 50%; border: 1px solid var(--line-soft); display: grid; place-items: center; background: linear-gradient(180deg, #1a1a1a, #0d0d0d); }
.logo-mark svg { width: 14px; height: 14px; }
.nav { display: flex; gap: 22px; align-items: center; }
.nav a { color: var(--muted); font-size: .94rem; }
.logo, .nav a, .btn, .card h3, .card p, .article-item h3, .article-item p, .download-item span, .article-meta {
  overflow-wrap: anywhere;
  word-break: break-word;
}
.nav a.active, .nav a:hover { color: var(--text); }
.menu-btn { display: none; background: transparent; color: var(--text); border: 1px solid var(--line); padding: 6px 10px; border-radius: 8px; }
.hero { padding: 78px 0 48px; }
.hero h1 { margin: 0; font-size: clamp(2rem, 4.3vw, 3.9rem); line-height: 1.16; }
.hero p { max-width: 780px; color: var(--muted); margin-top: 14px; }
.hero-actions { margin-top: 24px; display: flex; gap: 12px; flex-wrap: wrap; }
.kicker { color: var(--soft); font-size: .78rem; letter-spacing: .14em; text-transform: uppercase; }
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 10px 18px;
  font-size: .92rem;
}
.btn svg { width: 14px; height: 14px; }
.btn.primary { color: #111; border-color: #f2f2f2; background: #f2f2f2; }
.section { padding: 22px 0 8px; }
.section h2 { margin: 0 0 14px; font-size: 1.45rem; }
.grid { display: grid; gap: 16px; }
.grid > * { min-width: 0; }
.grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(180deg, rgba(255,255,255,.03), rgba(255,255,255,0));
  padding: 18px;
}
.card h3 { margin: 0 0 8px; font-size: 1.05rem; }
.card p { margin: 0; color: var(--muted); font-size: .95rem; }
.card { overflow: hidden; }
.icon-head { display: flex; align-items: center; gap: 10px; margin-bottom: 6px; }
.icon-head h3 { flex: 1; line-height: 1.35; }
.icon-badge { width: 30px; height: 30px; border: 1px solid var(--line-soft); border-radius: 8px; display: grid; place-items: center; background: #111; }
.icon-badge svg { width: 16px; height: 16px; }
.list { margin: 0; padding-left: 18px; color: var(--muted); }
.list li { margin-bottom: 8px; }
.page-title { padding: 50px 0 24px; }
.page-title h1 { margin: 8px 0 0; font-size: clamp(1.9rem, 3.7vw, 3rem); }
.article-item { padding: 16px 0; border-bottom: 1px solid var(--line); }
.article-item h3 { margin: 0 0 6px; }
.article-meta { color: var(--soft); font-size: .9rem; }
.article-item p { color: var(--muted); margin: 6px 0 0; }
.download-item { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.download-item + .download-item { margin-top: 12px; }
.download-item span { color: var(--muted); }
blockquote {
  margin: 16px 0;
  border-left: 2px solid #dfdfdf;
  background: rgba(255,255,255,.03);
  color: var(--muted);
  padding: 14px 16px;
}
.prose p { color: var(--muted); }
.footer { margin-top: 56px; border-top: 1px solid var(--line); color: var(--soft); font-size: .9rem; padding: 20px 0 34px; }
@media (max-width: 920px) {
  .grid-3 { grid-template-columns: 1fr; }
  .grid-2 { grid-template-columns: 1fr; }
}
@media (max-width: 760px) {
  .menu-btn { display: inline-block; }
  .nav {
    position: absolute; top: 60px; left: 4vw; right: 4vw;
    display: none; flex-direction: column; align-items: flex-start; gap: 10px;
    padding: 12px; border: 1px solid var(--line); border-radius: 12px; background: #0c0c0c;
  }
  .nav.open { display: flex; }
  .hero { padding-top: 56px; }
  .download-item { flex-direction: column; align-items: flex-start; }
  .download-item .btn { width: auto; }
}