:root {
  --bg: #0b1120;
  --bg-card: #111827;
  --bg-card-hover: #1e293b;
  --bg-input: #0f172a;
  --border: #1e293b;
  --border-highlight: #334155;
  --text: #f8fafc;
  --text-muted: #94a3b8;
  --text-dim: #64748b;
  --accent: #38bdf8;
  --accent-soft: rgba(56, 189, 248, 0.12);
  --success: #22c55e;
  --success-soft: rgba(34, 197, 94, 0.12);
  --warn: #f59e0b;
  --warn-soft: rgba(245, 158, 11, 0.12);
  --night: #818cf8;
  --night-soft: rgba(129, 140, 248, 0.12);
  --shadow: 0 10px 30px -10px rgba(0, 0, 0, 0.5);
}

[data-theme="light"] {
  --bg: #f1f5f9;
  --bg-card: #ffffff;
  --bg-card-hover: #f8fafc;
  --bg-input: #f1f5f9;
  --border: #e2e8f0;
  --border-highlight: #cbd5e1;
  --text: #0f172a;
  --text-muted: #475569;
  --text-dim: #94a3b8;
  --accent: #0284c7;
  --accent-soft: rgba(2, 132, 199, 0.1);
  --success: #16a34a;
  --success-soft: rgba(22, 163, 74, 0.1);
  --warn: #d97706;
  --warn-soft: rgba(217, 119, 6, 0.1);
  --night: #4f46e5;
  --night-soft: rgba(79, 70, 229, 0.1);
  --shadow: 0 10px 25px -10px rgba(15, 23, 42, 0.08);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Inter", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background-color: var(--bg);
  color: var(--text);
  line-height: 1.5;
  min-height: 100vh;
  transition: background-color 0.2s ease, color 0.2s ease;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 24px 20px 64px;
}

/* Header */
.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 20px;
  margin-bottom: 24px;
  border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
  gap: 12px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--text);
}

.brand-icon {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: var(--accent-soft);
  border: 1px solid rgba(56, 189, 248, 0.3);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
}

.brand-title {
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: -0.02em;
}

.brand-sub {
  font-size: 0.78rem;
  color: var(--text-muted);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--bg-card);
  color: var(--text);
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.15s ease;
}

.btn:hover {
  border-color: var(--border-highlight);
  background: var(--bg-card-hover);
}

.btn-accent {
  background: var(--accent-soft);
  border-color: rgba(56, 189, 248, 0.35);
  color: var(--accent);
}

/* Hero grid */
.hero-grid {
  display: grid;
  grid-template-columns: 1.45fr 1fr;
  gap: 20px;
  margin-bottom: 28px;
}

@media (max-width: 860px) {
  .hero-grid {
    grid-template-columns: 1fr;
  }
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 24px;
  box-shadow: var(--shadow);
}

.hero-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 10px;
  flex-wrap: wrap;
  gap: 8px;
}

.tz-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--accent);
  background: var(--accent-soft);
  padding: 4px 12px;
  border-radius: 999px;
}

.sync-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.8rem;
  font-weight: 500;
  padding: 4px 11px;
  border-radius: 999px;
  background: var(--success-soft);
  color: var(--success);
}

.sync-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: currentColor;
}

.main-clock-wrap {
  display: flex;
  align-items: baseline;
  gap: 8px;
  margin: 8px 0 6px;
}

.main-clock {
  font-size: clamp(3rem, 7vw, 5.2rem);
  font-weight: 800;
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.04em;
  line-height: 1.05;
}

.main-ms {
  font-size: clamp(1.2rem, 2.5vw, 1.9rem);
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  color: var(--text-muted);
}

.main-date {
  font-size: 1.05rem;
  color: var(--text-muted);
  margin-bottom: 18px;
}

.quick-meta {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
}

@media (max-width: 520px) {
  .quick-meta {
    grid-template-columns: repeat(2, 1fr);
  }
}

.meta-box {
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 10px 12px;
}

.meta-label {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-dim);
  margin-bottom: 2px;
}

.meta-val {
  font-size: 0.92rem;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 6px;
}

.copy-mini {
  background: none;
  border: none;
  color: var(--accent);
  cursor: pointer;
  font-size: 0.75rem;
  opacity: 0.85;
}

.copy-mini:hover {
  opacity: 1;
  text-decoration: underline;
}

/* NTP Sync card */
.ntp-card {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.ntp-title {
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 4px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.ntp-offset-big {
  font-size: 1.9rem;
  font-weight: 800;
  font-variant-numeric: tabular-nums;
  margin: 10px 0 4px;
}

.ntp-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 14px;
}

.ntp-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-bottom: 14px;
}

/* Converter Section */
.section-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
  flex-wrap: wrap;
  gap: 12px;
}

.section-title {
  font-size: 1.2rem;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.converter-card {
  margin-bottom: 28px;
}

.slider-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 14px;
  flex-wrap: wrap;
}

.slider-time-display {
  font-size: 1.1rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  color: var(--accent);
}

.time-slider {
  width: 100%;
  accent-color: var(--accent);
  height: 8px;
  border-radius: 999px;
  cursor: pointer;
  margin-bottom: 8px;
}

.slider-ticks {
  display: flex;
  justify-content: space-between;
  font-size: 0.72rem;
  color: var(--text-dim);
  font-variant-numeric: tabular-nums;
}

/* Filter bar */
.controls-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 18px;
  flex-wrap: wrap;
}

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

.tab {
  padding: 7px 14px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--bg-card);
  color: var(--text-muted);
  font-size: 0.84rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.15s ease;
}

.tab:hover {
  color: var(--text);
  border-color: var(--border-highlight);
}

.tab.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #0b1120;
  font-weight: 600;
}

.search-input {
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 8px 14px;
  border-radius: 10px;
  font-size: 0.88rem;
  min-width: 240px;
  outline: none;
}

.search-input:focus {
  border-color: var(--accent);
}

/* World Cities Grid */
.cities-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(270px, 1fr));
  gap: 14px;
}

.city-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 15px;
  padding: 16px 18px;
  transition: transform 0.15s ease, border-color 0.15s ease;
  position: relative;
}

.city-card:hover {
  border-color: var(--border-highlight);
  transform: translateY(-1px);
}

.city-card.pinned {
  border-color: rgba(56, 189, 248, 0.45);
}

.city-top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 10px;
}

.city-name {
  font-weight: 700;
  font-size: 1rem;
  display: flex;
  align-items: center;
  gap: 6px;
}

.city-country {
  font-size: 0.78rem;
  color: var(--text-muted);
}

.pin-btn {
  background: none;
  border: none;
  color: var(--text-dim);
  cursor: pointer;
  font-size: 1rem;
  line-height: 1;
  padding: 2px 4px;
}

.pin-btn.active {
  color: var(--warn);
}

.city-clock-row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 10px;
}

.city-time {
  font-size: 1.85rem;
  font-weight: 800;
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.03em;
}

.city-sec {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-muted);
}

.city-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.76rem;
  color: var(--text-muted);
  padding-top: 10px;
  border-top: 1px solid var(--border);
}

.day-status {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 2px 8px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.72rem;
}

.status-work {
  background: var(--success-soft);
  color: var(--success);
}

.status-eve {
  background: var(--warn-soft);
  color: var(--warn);
}

.status-night {
  background: var(--night-soft);
  color: var(--night);
}

.footer {
  margin-top: 48px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 0.8rem;
  color: var(--text-dim);
}