/*
  Shared site theme: fixed blue/white/gold header component (used by every
  page) plus a toggleable light/dark theme for everything below it.
*/

:root {
  --blue: #2774AE;
  --gold: #FFD100;

  --bg: #fafafa;
  --surface: #ffffff;
  --text: #1a1a1a;
  --muted: #555;
  --border: #ddd;
  --footer-muted: #aaa;
  --content-primary: var(--blue);
  --content-accent: var(--gold);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #1a1a1a;
    --surface: #262626;
    --text: #f0f0f0;
    --muted: #aaa;
    --border: #333;
    --footer-muted: #777;
    --content-primary: var(--blue);
    --content-accent: var(--gold);
  }
}

:root[data-theme="dark"] {
  --bg: #1a1a1a;
  --surface: #262626;
  --text: #f0f0f0;
  --muted: #aaa;
  --border: #333;
  --footer-muted: #777;
  --content-primary: var(--blue);
  --content-accent: var(--gold);
}

/* Smooth fade for theme-driven colors */
*, *::before, *::after {
  transition: background-color 0.35s ease, color 0.35s ease, border-color 0.35s ease;
}

/* HEADER (nav + hero) */
nav {
  background: var(--blue);
  padding: 0 2.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 56px;
}

.nav-name {
  color: white;
  font-weight: 500;
  font-size: 1rem;
  letter-spacing: 0.01em;
}

.nav-links { display: flex; gap: 1.8rem; list-style: none; align-items: center; line-height: normal; }

.nav-links li { display: flex; align-items: center; }

.nav-links a {
  color: rgba(255,255,255,0.82);
  text-decoration: none;
  font-size: 0.85rem;
  transition: color 0.15s;
}

.nav-links a:hover { color: var(--gold); }

.hero {
  background: var(--blue);
  padding: 3.5rem 2.5rem 3rem;
  border-bottom: 4px solid var(--gold);
}

.hero h1 {
  font-family: var(--serif, Georgia, serif);
  font-size: 2.6rem;
  color: white;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.hero p {
  color: rgba(255,255,255,0.78);
  font-size: 1rem;
  max-width: 480px;
}

@media (max-width: 600px) {
  nav { padding: 0 1.2rem; }
  .hero { padding: 2.5rem 1.2rem 2rem; }
  .hero h1 { font-size: 2rem; }
}

/* THEME TOGGLE SWITCH */
.theme-toggle {
  position: relative;
  display: inline-flex;
  align-items: center;
  line-height: 1;
  cursor: pointer;
}

.theme-toggle-auto {
  position: absolute;
  top: 50%;
  left: 34px;
  transform: translate(-50%, -50%);
  color: rgba(0,0,0,0.55);
  font-size: 0.55rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  pointer-events: none;
}

.theme-toggle--checked .theme-toggle-auto {
  left: 20px;
}

.theme-toggle:not(.theme-toggle--auto) .theme-toggle-auto {
  display: none;
}

.theme-toggle input {
  appearance: none;
  -webkit-appearance: none;
  width: 54px;
  height: 18px;
  border-radius: 9px;
  background: rgba(255,255,255,0.3);
  position: relative;
  cursor: pointer;
  transition: background 0.15s;
}

.theme-toggle input::before {
  content: '';
  position: absolute;
  top: 2px;
  left: 2px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: white;
  transition: transform 0.15s;
}

.theme-toggle input:checked {
  background: var(--gold);
}

.theme-toggle input:checked::before {
  transform: translateX(36px);
}

.theme-toggle--fixed {
  position: fixed;
  bottom: 1.2rem;
  right: 1.2rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 0.4rem 0.8rem;
  z-index: 1000;
}

.theme-toggle--fixed input {
  background: rgba(0,0,0,0.15);
}

.theme-toggle--fixed .theme-toggle-auto {
  color: var(--muted);
}