:root {
  --bg: #0b1220;
  --bg-alt: #0f172a;
  --text: #e5e7eb;
  --muted: #94a3b8;
  --brand: #4f46e5;
  --brand-2: #06b6d4;
  --card: #0f172a;
  --border: #263043;
  --success: #16a34a;
}

[data-theme="light"] {
  --bg: #ffffff;
  --bg-alt: #f8fafc;
  --text: #0f172a;
  --muted: #475569;
  --card: #ffffff;
  --border: #e5e7eb;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: Inter, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
  color: var(--text);
  background: radial-gradient(1200px 800px at 80% -10%, rgba(79,70,229,0.25), transparent 60%),
              radial-gradient(1000px 600px at -10% -20%, rgba(6,182,212,0.2), transparent 60%),
              var(--bg);
  line-height: 1.6;
}

img { max-width: 100%; display: block; }
svg { display: block; }

.skip-link {
  position: absolute;
  left: -999px;
  top: auto;
  width: 1px;
  height: 1px;
  overflow: hidden;
}
.skip-link:focus { left: 16px; top: 16px; width: auto; height: auto; padding: 8px 12px; background: var(--bg-alt); border-radius: 6px; }

.container { width: min(1120px, 92%); margin: 0 auto; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: saturate(1.2) blur(8px);
  background: color-mix(in srgb, var(--bg) 86%, transparent);
  border-bottom: 1px solid var(--border);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 14px 0; }

.logo { display: inline-flex; align-items: center; gap: 10px; text-decoration: none; color: var(--text); font-weight: 600; letter-spacing: 0.2px; }
.logo-mark { font-size: 20px; }
.logo-type { font-size: 16px; }

.nav { display: flex; align-items: center; gap: 16px; }
.nav-toggle { display: none; background: transparent; border: 0; padding: 6px; cursor: pointer; }
.nav-toggle .bar { display: block; width: 22px; height: 2px; background: var(--text); margin: 5px 0; border-radius: 2px; }
.nav-list { list-style: none; display: flex; align-items: center; gap: 18px; margin: 0; padding: 0; }
.nav-list a { color: var(--muted); text-decoration: none; padding: 8px 10px; border-radius: 8px; transition: color .2s, background .2s; }
.nav-list a:hover { color: var(--text); background: color-mix(in srgb, var(--text) 8%, transparent); }

.header-actions { display: flex; align-items: center; gap: 10px; }
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; padding: 12px 16px; border-radius: 12px; text-decoration: none; font-weight: 600; border: 1px solid var(--border); color: var(--text); background: color-mix(in srgb, var(--bg) 70%, transparent); transition: transform .06s ease, background .2s, color .2s, border-color .2s; }
.btn:hover { transform: translateY(-1px); border-color: color-mix(in srgb, var(--brand) 30%, var(--border)); }
.btn-sm { padding: 8px 12px; border-radius: 10px; font-size: 14px; }
.btn-primary { background: linear-gradient(135deg, var(--brand), var(--brand-2)); border-color: transparent; }
.btn-primary:hover { filter: brightness(1.05); }
.btn-secondary { background: var(--bg-alt); }
.btn-ghost { background: transparent; }

.theme-toggle { background: transparent; border: 1px solid var(--border); color: var(--text); border-radius: 10px; width: 40px; height: 36px; display: inline-grid; place-items: center; cursor: pointer; }

.section { padding: 72px 0; }
.section.alt { background: color-mix(in srgb, var(--bg-alt) 70%, transparent); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.section-header { text-align: center; margin-bottom: 28px; }
.section-header h2 { margin: 0 0 8px 0; font-size: 32px; letter-spacing: -0.02em; }
.section-header p { margin: 0; color: var(--muted); }

.hero { padding: 96px 0 64px; }
.hero-content { text-align: center; }
.hero h1 { margin: 0 0 16px 0; font-size: clamp(28px, 5vw, 40px); letter-spacing: -0.02em; }
.hero .lead { margin: 0 auto; max-width: 800px; color: var(--muted); font-size: 18px; }
.cta { display: flex; flex-wrap: wrap; justify-content: center; gap: 12px; margin-top: 22px; }

.stats-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.stat { border: 1px solid var(--border); border-radius: 16px; padding: 18px; background: var(--card); text-align: center; }
.stat-value { font-size: 28px; font-weight: 700; letter-spacing: -0.02em; }
.stat-label { color: var(--muted); }

.two-col { display: grid; grid-template-columns: 1.2fr 1fr; gap: 24px; align-items: start; }

.card { border: 1px solid var(--border); border-radius: 16px; padding: 18px; background: var(--card); }
.card.gradient { background: linear-gradient(180deg, color-mix(in srgb, var(--brand) 12%, var(--card)), color-mix(in srgb, var(--brand-2) 8%, var(--card))); }
.card h3 { margin-top: 0; }
.link { color: #93c5fd; text-decoration: none; }
.link:hover { text-decoration: underline; }

.checklist { padding-left: 0; list-style: none; }
.checklist li { position: relative; padding-left: 28px; margin: 10px 0; }
.checklist li::before { content: ""; position: absolute; left: 0; top: 8px; width: 18px; height: 18px; border-radius: 50%; background: radial-gradient(circle at 30% 30%, #22c55e, #16a34a); box-shadow: 0 0 0 2px color-mix(in srgb, var(--bg) 60%, transparent); }

.cards-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }

.notice { border: 1px dashed var(--border); border-radius: 16px; padding: 18px; background: color-mix(in srgb, var(--bg-alt) 60%, transparent); }

.site-footer { border-top: 1px solid var(--border); margin-top: 32px; background: color-mix(in srgb, var(--bg) 86%, transparent); }
.footer-inner { display: grid; grid-template-columns: 1fr auto auto; gap: 16px; padding: 24px 0; align-items: center; }
.footer-brand { display: flex; align-items: center; gap: 10px; }
.footer-brand .small { color: var(--muted); margin: 0; }
.footer-nav { display: flex; gap: 12px; }
.footer-nav a { color: var(--muted); text-decoration: none; padding: 6px 8px; border-radius: 8px; }
.footer-nav a:hover { color: var(--text); background: color-mix(in srgb, var(--text) 8%, transparent); }
.footer-meta { display: flex; gap: 12px; align-items: center; color: var(--muted); }
.footer-meta a { color: var(--muted); text-decoration: none; }
.footer-meta a:hover { color: var(--text); }

@media (max-width: 960px) {
  .cards-grid { grid-template-columns: repeat(2, 1fr); }
  .two-col { grid-template-columns: 1fr; }
}

@media (max-width: 720px) {
  .nav-toggle { display: inline-block; }
  .nav-list { position: absolute; right: 4%; top: 64px; flex-direction: column; align-items: stretch; background: var(--bg-alt); border: 1px solid var(--border); border-radius: 12px; padding: 8px; display: none; min-width: 220px; }
  .nav-list.open { display: flex; }
  .nav-list a { padding: 10px 12px; }
  .stats-grid { grid-template-columns: 1fr; }
  .cards-grid { grid-template-columns: 1fr; }
}