:root {
  --brand-primary: #111827;
  --brand-secondary: #6366f1;
  --brand-accent: #f97316;
  --brand-muted: #94a3b8;
  --surface: #f8fafc;
  --surface-elevated: #ffffff;
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --shadow: 0 30px 80px rgba(15, 23, 42, 0.15);
  --bg: var(--surface);
  --text: var(--text-primary);
  --muted: var(--text-secondary);
  --border: rgba(148, 163, 184, 0.35);
  --brand: var(--brand-secondary);
  --brand-strong: #4f46e5;
  --soft: rgba(99, 102, 241, 0.18);
  color-scheme: light;
  font-family: 'Sora', system-ui, sans-serif;
}

[data-theme='dark'] {
  --surface: #0b1120;
  --surface-elevated: #0f172a;
  --text-primary: #f8fafc;
  --text-secondary: #cbd5f5;
  --brand-primary: #e2e8f0;
  --brand-secondary: #7dd3fc;
  --brand-accent: #fb7185;
  --shadow: 0 30px 80px rgba(15, 23, 42, 0.6);
  --bg: #070b14;
  --text: var(--text-primary);
  --muted: #9ca3af;
  --border: rgba(148, 163, 184, 0.3);
  --brand: var(--brand-secondary);
  --brand-strong: #38bdf8;
  --soft: rgba(125, 211, 252, 0.12);
  color-scheme: dark;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: radial-gradient(circle at top, rgba(99, 102, 241, 0.2), transparent 55%),
    radial-gradient(circle at 20% 30%, rgba(249, 115, 22, 0.15), transparent 45%),
    var(--surface);
  color: var(--text-primary);
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 24px 48px 0;
}

.logo {
  font-weight: 700;
  letter-spacing: -0.02em;
  font-size: 20px;
}

.theme-toggle {
  background: var(--surface-elevated);
  border: 1px solid rgba(148, 163, 184, 0.3);
  border-radius: 999px;
  width: 38px;
  height: 38px;
  padding: 0;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.2s ease;
  font: inherit;
  display: grid;
  place-items: center;
  position: fixed;
  top: 16px;
  right: 18px;
  z-index: 20;
  box-shadow: 0 8px 24px rgba(15, 23, 42, 0.18);
}

.theme-toggle:hover {
  border-color: var(--brand-secondary);
  color: var(--text-primary);
}

.theme-toggle svg {
  width: 18px;
  height: 18px;
  display: block;
}

.site-main-narrow {
  width: min(820px, 94vw);
  margin: 20px auto 34px;
  display: grid;
  gap: 14px;
}

@media (max-width: 960px) {
  .site-header {
    padding: 20px 24px 0;
  }

  .theme-toggle {
    top: 12px;
    right: 12px;
  }
}