:root {
  --brand-primary: #23272e;
  --brand-secondary: #b39557;
  --brand-accent: #d0ba83;
  --brand-muted: #5f5a50;
  --surface: #ece8df;
  --surface-elevated: #f7f4ef;
  --surface-strong: #efebe3;
  --text-primary: #1f242b;
  --text-secondary: #5f5a50;
  --text-tertiary: #746c60;
  --shadow: 0 24px 56px rgba(17, 21, 27, 0.12);
  --bg:
    radial-gradient(circle at 0% 16%, rgba(179, 149, 87, 0.08), transparent 24%),
    radial-gradient(circle at 100% 0%, rgba(104, 90, 63, 0.06), transparent 28%),
    linear-gradient(180deg, #eae6dd 0%, #f3efe7 46%, #e9e4da 100%);
  --text: var(--text-primary);
  --muted: var(--text-secondary);
  --border: rgba(34, 38, 44, 0.12);
  --border-strong: rgba(34, 38, 44, 0.18);
  --brand: var(--brand-secondary);
  --brand-strong: #8e7850;
  --soft: rgba(179, 149, 87, 0.12);
  --success: #1f7a5a;
  --warning: #8b5c13;
  --danger: #9f3740;
  --focus-ring: #5e4a24;
  --font-display: 'Space Grotesk', system-ui, sans-serif;
  --font-body: 'IBM Plex Sans', system-ui, sans-serif;
  --font-mono: 'IBM Plex Mono', ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  color-scheme: light;
  font-family: var(--font-body);
}

[data-theme='dark'] {
  --brand-primary: #f2eee4;
  --brand-secondary: #b39557;
  --brand-accent: #dcc696;
  --brand-muted: #a7a39a;
  --surface: #15191f;
  --surface-elevated: #1b2027;
  --surface-strong: #21262e;
  --text-primary: #f0eee8;
  --text-secondary: #a7a39a;
  --text-tertiary: #8c887e;
  --shadow: 0 26px 64px rgba(0, 0, 0, 0.32);
  --bg:
    radial-gradient(circle at 12% 10%, rgba(190, 161, 94, 0.08), transparent 24%),
    radial-gradient(circle at 92% 0%, rgba(96, 82, 50, 0.08), transparent 28%),
    linear-gradient(180deg, #13181f 0%, #181d24 52%, #14181f 100%);
  --text: var(--text-primary);
  --muted: var(--text-secondary);
  --border: rgba(241, 234, 219, 0.08);
  --border-strong: rgba(241, 234, 219, 0.12);
  --brand: var(--brand-secondary);
  --brand-strong: #d0ba83;
  --soft: rgba(179, 149, 87, 0.12);
  --success: #2fa978;
  --warning: #d18d4c;
  --danger: #de6b71;
  --focus-ring: #e0c98f;
  color-scheme: dark;
}

* {
  box-sizing: border-box;
}

html,
body {
  min-height: 100%;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text-primary);
  font-family: var(--font-body);
  text-rendering: optimizeLegibility;
}

::selection {
  background: rgba(179, 149, 87, 0.22);
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 22px 28px 0;
}

.logo {
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: -0.04em;
  font-size: 20px;
  color: var(--text-primary);
}

.theme-toggle {
  background: color-mix(in srgb, var(--surface-elevated) 88%, transparent);
  border: 1px solid var(--border);
  border-radius: 999px;
  width: 42px;
  height: 42px;
  padding: 0;
  color: var(--text-secondary);
  cursor: pointer;
  transition: background 0.18s ease, color 0.18s ease, border-color 0.18s ease, transform 0.18s ease;
  font: inherit;
  display: grid;
  place-items: center;
  position: fixed;
  top: 16px;
  right: 18px;
  z-index: 40;
  box-shadow: 0 12px 32px rgba(17, 21, 27, 0.16);
  backdrop-filter: blur(10px);
}

.theme-toggle:hover {
  border-color: rgba(179, 149, 87, 0.34);
  color: var(--text-primary);
  transform: translateY(-1px);
}

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

.site-main-narrow {
  width: min(860px, 94vw);
  margin: 24px auto 38px;
  display: grid;
  gap: 16px;
}

@media (max-width: 960px) {
  .site-header {
    padding: 18px 18px 0;
  }

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