/* ========================================
   Timegan — 全局共享样式
   ======================================== */

/* === CSS 变量 === */
:root {
  --bg: #0f1117;
  --bg2: #1a1d27;
  --bg3: #242836;
  --ink: #e8eaed;
  --muted: #8b8fa3;
  --rule: #2d3140;
  --accent: #6c8cff;
  --accent2: #a78bfa;
  --green: #34d399;
  --red: #f87171;
  --orange: #fb923c;
  --font: 'Segoe UI', system-ui, -apple-system, sans-serif;
  --font-mono: 'SF Mono', 'Cascadia Code', 'Consolas', monospace;
  --radius: 12px;
  --shadow: 0 4px 24px rgba(0,0,0,0.3);
}

/* === 全局重置 === */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; scroll-behavior: smooth; }

body {
  font-family: var(--font);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.7;
  min-height: 100vh;
}

/* === Header === */
header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 2rem;
  border-bottom: 1px solid var(--rule);
  background: var(--bg);
  position: sticky;
  top: 0;
  z-index: 100;
}
.logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--accent);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
nav { display: flex; gap: 1.5rem; align-items: center; }
nav a {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.9rem;
  transition: color 0.2s;
}
nav a:hover { color: var(--ink); }
nav a.active { color: var(--accent); }

/* === Language Switcher === */
.lang-switcher {
  position: relative;
  margin-left: 0.5rem;
}
.lang-switcher-btn {
  background: transparent;
  border: 1px solid var(--rule);
  color: var(--muted);
  padding: 0.35rem 0.7rem;
  border-radius: 20px;
  font-family: var(--font);
  font-size: 0.78rem;
  cursor: pointer;
  transition: all 0.25s ease;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  letter-spacing: 0.02em;
  user-select: none;
}
.lang-switcher-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: rgba(108, 140, 255, 0.08);
}
.lang-switcher-btn::after {
  content: '';
  display: inline-block;
  width: 0;
  height: 0;
  border-left: 3px solid transparent;
  border-right: 3px solid transparent;
  border-top: 3px solid currentColor;
  transition: transform 0.2s ease;
}
.lang-switcher.open .lang-switcher-btn::after {
  transform: rotate(180deg);
}
.lang-dropdown {
  display: block;
  position: absolute;
  top: calc(100% + 6px);
  right: 0;
  background: var(--bg2);
  border: 1px solid var(--rule);
  border-radius: 10px;
  padding: 0.35rem;
  min-width: 130px;
  z-index: 200;
  box-shadow: 0 8px 32px rgba(0,0,0,0.4);
  opacity: 0;
  transform: translateY(-4px) scale(0.97);
  transition: opacity 0.2s ease, transform 0.2s ease;
  pointer-events: none;
}
.lang-switcher.open .lang-dropdown {
  opacity: 1;
  transform: translateY(0) scale(1);
  pointer-events: auto;
}
.lang-dropdown a {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.55rem 0.8rem;
  border-radius: 6px;
  font-size: 0.82rem;
  color: var(--muted);
  text-decoration: none;
  transition: all 0.2s ease;
}
.lang-dropdown a:hover {
  background: var(--bg3);
  color: var(--ink);
}
.lang-dropdown a.active {
  color: var(--accent);
  font-weight: 600;
  background: rgba(108, 140, 255, 0.1);
}
.lang-dropdown a.active::after {
  content: '✓';
  margin-left: auto;
  font-size: 0.7rem;
  color: var(--accent);
}

/* === Footer === */
footer {
  border-top: 1px solid var(--rule);
  padding: 2rem;
  text-align: center;
}
footer p { font-size: 0.82rem; color: var(--muted); }
.footer-links {
  display: flex;
  justify-content: center;
  gap: 1.5rem;
  margin-top: 0.75rem;
}
.footer-links a {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.82rem;
}
.footer-links a:hover { color: var(--ink); }

/* === 通用组件 === */
.ctrl-btn {
  padding: 0.7rem 2rem;
  border: 1px solid var(--rule);
  background: var(--bg2);
  color: var(--ink);
  font-size: 0.95rem;
  font-family: var(--font);
  cursor: pointer;
  border-radius: 8px;
  transition: all 0.2s;
  min-width: 90px;
}
.ctrl-btn:hover:not(:disabled) {
  border-color: var(--accent);
  background: var(--bg3);
}
.ctrl-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}
.ctrl-btn.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
  font-weight: 600;
}
.ctrl-btn.primary:hover:not(:disabled) { background: #5a7af0; }
.ctrl-btn.green {
  background: var(--green);
  border-color: var(--green);
  color: #0f1117;
  font-weight: 600;
}
.ctrl-btn.red {
  background: var(--red);
  border-color: var(--red);
  color: #fff;
  font-weight: 600;
}

.controls {
  display: flex;
  justify-content: center;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
}

/* === 全屏按钮（时钟页面共用） === */
.fullscreen-btn {
  position: fixed;
  top: 5rem;
  right: 1.5rem;
  background: var(--bg2);
  border: 1px solid var(--rule);
  color: var(--muted);
  padding: 0.6rem 1rem;
  border-radius: 8px;
  cursor: pointer;
  font-family: var(--font);
  font-size: 0.85rem;
  transition: all 0.2s;
  z-index: 100;
}
.fullscreen-btn:hover {
  border-color: var(--accent);
  color: var(--ink);
}

/* === 动画 === */
@keyframes pulse-glow {
  0%, 100% { text-shadow: 0 0 40px rgba(108,140,255,0.1); }
  50% { text-shadow: 0 0 60px rgba(108,140,255,0.25); }
}
@keyframes blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.2; }
}
@keyframes flash {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.3; }
}

/* === 响应式 === */
@media (max-width: 600px) {
  header { padding: 0.75rem 1rem; flex-wrap: wrap; gap: 0.5rem; }
  nav { gap: 1rem; }
  .fullscreen-btn { top: 4.5rem; right: 1rem; padding: 0.5rem 0.8rem; font-size: 0.75rem; }
}