/* ═══════════════════════════════════════════════
   Science Games — global styles
   ═══════════════════════════════════════════════ */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --green:      #16a34a;
  --green-lt:   #dcfce7;
  --green-sat:  #22c55e;
  --blue:       #2563eb;
  --blue-lt:    #dbeafe;
  --blue-sat:   #3b82f6;
  --orange:     #ea580c;
  --orange-lt:  #ffedd5;
  --purple:     #7c3aed;
  --purple-lt:  #f5f3ff;
  --text:       #111827;
  --text-sm:    #6b7280;
  --white:      #ffffff;
  --bg:         #f8fafc;
  --shadow:     0 4px 24px rgba(0,0,0,.08);
  --shadow-lg:  0 8px 48px rgba(0,0,0,.12);
}

body {
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
}

/* ── Site Header ── */
.site-header {
  background: var(--white);
  border-bottom: 2px solid #e5e7eb;
  padding: 0 2rem;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 8px rgba(0,0,0,.06);
}

.site-logo {
  display: flex;
  align-items: center;
  gap: .55rem;
  text-decoration: none;
  font-size: 1.2rem;
  font-weight: 800;
  color: var(--text);
}
.logo-sci   { color: var(--green); }
.logo-games { color: var(--blue); }

.site-nav { display: flex; gap: 1.5rem; list-style: none; }
.site-nav a {
  text-decoration: none;
  color: var(--text-sm);
  font-weight: 600;
  font-size: .93rem;
  transition: color .15s;
}
.site-nav a:hover,
.site-nav a.active { color: var(--text); }

/* ── Game card ── */
.game-card {
  background: var(--white);
  border-radius: 20px;
  padding: 1.75rem;
  box-shadow: var(--shadow);
  border: 2px solid #e5e7eb;
  display: flex;
  flex-direction: column;
  gap: .6rem;
  transition: transform .18s, box-shadow .18s;
}
.game-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-lg); }
.game-card-icon  { font-size: 2.5rem; }
.game-card h3    { font-size: 1.2rem; font-weight: 800; }
.game-card p     { color: var(--text-sm); font-size: .91rem; line-height: 1.6; }
.game-card-meta  { font-size: .78rem; color: var(--text-sm); font-weight: 600; letter-spacing: .03em; }

.play-btn {
  display: inline-block;
  margin-top: .5rem;
  padding: .6rem 1.4rem;
  border-radius: 50px;
  font-weight: 700;
  font-size: .93rem;
  text-decoration: none;
  transition: all .15s;
  align-self: flex-start;
}
.play-btn:hover { transform: translateY(-1px); opacity: .92; }
.play-btn.green  { background: var(--green-sat); color: #fff; }
.play-btn.blue   { background: var(--blue-sat);  color: #fff; }
.play-btn.orange { background: var(--orange);    color: #fff; }

/* ── Games grid ── */
.games-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.5rem;
  padding: 2rem;
  max-width: 1100px;
  margin: 0 auto;
}

/* ── Coming soon ── */
.coming-soon {
  text-align: center;
  padding: 4rem 2rem;
  color: var(--text-sm);
}
.coming-soon .cs-icon { font-size: 4rem; margin-bottom: 1rem; display: block; }
.coming-soon h3 { font-size: 1.3rem; font-weight: 700; color: var(--text); margin-bottom: .5rem; }

/* ── Footer ── */
.site-footer {
  text-align: center;
  padding: 1.5rem;
  color: var(--text-sm);
  font-size: .85rem;
  border-top: 1px solid #e5e7eb;
  margin-top: 3rem;
}

/* ── Breadcrumb ── */
.breadcrumb {
  padding: .65rem 2rem;
  font-size: .82rem;
  color: var(--text-sm);
  background: var(--white);
  border-bottom: 1px solid #f3f4f6;
}
.breadcrumb a { color: var(--text-sm); text-decoration: none; }
.breadcrumb a:hover { text-decoration: underline; }
.breadcrumb .sep { margin: 0 .4rem; color: #d1d5db; }

/* ── Dark Mode Toggle Button ── */
.dark-toggle {
  background: none;
  border: 1.5px solid #e5e7eb;
  border-radius: 50px;
  width: 38px;
  height: 38px;
  font-size: 1.1rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: border-color .15s, background .15s;
  flex-shrink: 0;
}
.dark-toggle:hover { background: var(--bg); border-color: #9ca3af; }

/* ── Page Hero — class hook for dark-mode targeting ── */
.page-hero { display: block; }

/* ══ Dark Mode ══ */
[data-theme="dark"] {
  --text:      #f1f5f9;
  --text-sm:   #94a3b8;
  --white:     #1e293b;
  --bg:        #0f172a;
  --shadow:    0 4px 24px rgba(0,0,0,.35);
  --shadow-lg: 0 8px 48px rgba(0,0,0,.5);
}
[data-theme="dark"] .site-header {
  border-bottom-color: #334155;
  box-shadow: 0 2px 8px rgba(0,0,0,.3);
}
[data-theme="dark"] .dark-toggle       { border-color: #475569; }
[data-theme="dark"] .dark-toggle:hover { background: #334155; }
[data-theme="dark"] .game-card         { border-color: #334155; }
[data-theme="dark"] .site-footer       { border-top-color: #1e293b; }
[data-theme="dark"] .breadcrumb        { border-bottom-color: #1e293b; }
[data-theme="dark"] .page-hero.life {
  background: linear-gradient(135deg, #052e16, #022c22) !important;
  border-bottom-color: #14532d !important;
}
[data-theme="dark"] .page-hero.phys {
  background: linear-gradient(135deg, #0c1a4a, #0a1535) !important;
  border-bottom-color: #1e3a8a !important;
}
[data-theme="dark"] .page-hero h1      { color: #4ade80 !important; }
[data-theme="dark"] .page-hero.phys h1 { color: #60a5fa !important; }
[data-theme="dark"] .page-hero p       { color: #94a3b8 !important; }