/* ================================================
   Time.is Clone - Style Sheet
   精确时钟网站样式
   ================================================ */

:root {
  --bg-primary: #0a0a0f;
  --bg-secondary: #12121a;
  --bg-card: #1a1a24;
  --text-primary: #f0f0f5;
  --text-secondary: #8888aa;
  --accent: #4fc3f7;
  --accent-dim: #1e3a5f;
  --success: #4caf50;
  --warning: #ff9800;
  --border: #2a2a3a;
  --shadow: rgba(0, 0, 0, 0.5);
  --font-mono: 'JetBrains Mono', 'SF Mono', 'Consolas', monospace;
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html, body {
  height: 100%;
}

body {
  font-family: var(--font-sans);
  background: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
}

/* ─── Header ─── */
.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 24px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.header-left {
  display: flex;
  align-items: center;
  gap: 16px;
}

.logo {
  font-size: 15px;
  font-weight: 600;
  color: var(--accent);
  letter-spacing: 0.5px;
}

.timezone-selector {
  display: flex;
  align-items: center;
  gap: 8px;
}

.timezone-selector label {
  font-size: 12px;
  color: var(--text-secondary);
}

.timezone-selector select {
  background: var(--bg-card);
  color: var(--text-primary);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 5px 10px;
  font-size: 13px;
  cursor: pointer;
  outline: none;
  transition: border-color 0.2s;
}

.timezone-selector select:hover,
.timezone-selector select:focus {
  border-color: var(--accent);
}

.lang-toggle {
  font-size: 12px;
  color: var(--text-secondary);
  cursor: pointer;
  padding: 5px 10px;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--bg-card);
  transition: all 0.2s;
}

.lang-toggle:hover {
  border-color: var(--accent);
  color: var(--text-primary);
}

/* ─── Main Clock Area ─── */
.main {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 40px 20px;
  gap: 0;
}

.clock-container {
  text-align: center;
  user-select: none;
}

.time-display {
  font-family: var(--font-mono);
  font-size: clamp(72px, 14vw, 140px);
  font-weight: 700;
  letter-spacing: -4px;
  line-height: 1;
  color: var(--text-primary);
  text-shadow: 0 0 40px rgba(79, 195, 247, 0.15);
  transition: color 0.3s;
}

.time-display .seconds {
  font-size: 0.45em;
  font-weight: 400;
  color: var(--accent);
  letter-spacing: 0;
  vertical-align: super;
}

.date-display {
  font-size: 18px;
  color: var(--text-secondary);
  margin-top: 10px;
  letter-spacing: 1px;
}

.timezone-name {
  font-size: 13px;
  color: var(--accent);
  margin-top: 6px;
  font-family: var(--font-mono);
  letter-spacing: 0.5px;
}

.accuracy-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 14px;
  padding: 5px 12px;
  background: var(--accent-dim);
  border: 1px solid rgba(79, 195, 247, 0.2);
  border-radius: 20px;
  font-size: 12px;
  color: var(--accent);
  font-family: var(--font-mono);
}

.accuracy-dot {
  width: 6px;
  height: 6px;
  background: var(--success);
  border-radius: 50%;
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

/* ─── Sunrise/Sunset Card ─── */
.sun-card {
  margin-top: 28px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 16px 32px;
  display: flex;
  align-items: center;
  gap: 28px;
}

.sun-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: var(--text-secondary);
}

.sun-item .time {
  font-family: var(--font-mono);
  font-size: 16px;
  color: var(--text-primary);
  font-weight: 600;
}

.sun-icon {
  font-size: 18px;
}

.day-length {
  font-size: 13px;
  color: var(--text-secondary);
  padding-left: 20px;
  border-left: 1px solid var(--border);
}

.day-length strong {
  color: var(--text-primary);
  font-weight: 600;
}

/* ─── World Clock Grid ─── */
.world-clocks {
  margin-top: 28px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  width: 100%;
  max-width: 640px;
}

.world-clock-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px 16px;
  text-align: center;
  transition: border-color 0.2s;
}

.world-clock-item:hover {
  border-color: var(--accent);
}

.world-clock-item .city {
  font-size: 12px;
  color: var(--text-secondary);
  margin-bottom: 4px;
}

.world-clock-item .time {
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 600;
  color: var(--text-primary);
}

.world-clock-item .country {
  font-size: 11px;
  color: var(--text-secondary);
  margin-top: 2px;
}

/* ─── Special Day ─── */
.special-day {
  margin-top: 18px;
  padding: 8px 18px;
  background: rgba(255, 152, 0, 0.08);
  border: 1px solid rgba(255, 152, 0, 0.2);
  border-radius: 8px;
  font-size: 13px;
  color: var(--warning);
}

/* ─── Tool Tabs ─── */
.tool-tabs {
  display: flex;
  justify-content: center;
  gap: 8px;
  padding: 18px 20px;
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
  flex-shrink: 0;
}

.tab-btn {
  padding: 8px 20px;
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 13px;
  cursor: pointer;
  transition: all 0.2s;
}

.tab-btn:hover,
.tab-btn.active {
  background: var(--accent-dim);
  color: var(--accent);
  border-color: rgba(79, 195, 247, 0.3);
}

/* ─── Loading State ─── */
.loading-overlay {
  position: fixed;
  inset: 0;
  background: var(--bg-primary);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  z-index: 1000;
  transition: opacity 0.4s;
}

.loading-overlay.hidden {
  opacity: 0;
  pointer-events: none;
}

.loader-ring {
  width: 40px;
  height: 40px;
  border: 3px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.loading-text {
  font-size: 13px;
  color: var(--text-secondary);
  font-family: var(--font-mono);
}

/* ─── Sync Status ─── */
.sync-status {
  position: fixed;
  bottom: 70px;
  right: 20px;
  font-size: 11px;
  color: var(--text-secondary);
  font-family: var(--font-mono);
  opacity: 0;
  transition: opacity 0.3s;
}

.sync-status.visible {
  opacity: 1;
}

/* ─── Responsive ─── */
@media (max-width: 600px) {
  .header {
    padding: 10px 16px;
    flex-wrap: wrap;
    gap: 10px;
  }

  .time-display {
    letter-spacing: -2px;
  }

  .sun-card {
    flex-direction: column;
    gap: 12px;
    padding: 14px 20px;
  }

  .day-length {
    border-left: none;
    border-top: 1px solid var(--border);
    padding-left: 0;
    padding-top: 12px;
  }

  .world-clocks {
    grid-template-columns: repeat(2, 1fr);
    max-width: 100%;
  }

  .tool-tabs {
    flex-wrap: wrap;
    gap: 6px;
  }

  .tab-btn {
    padding: 6px 14px;
    font-size: 12px;
  }
}

/* ─── Custom Scrollbar ─── */
::-webkit-scrollbar {
  width: 6px;
}

::-webkit-scrollbar-track {
  background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 3px;
}