@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Mono:wght@400;500;700&family=Inter:wght@400;500;600;700&display=swap');

:root {
  --bg: #12151c;
  --panel: #1b2029;
  --panel-border: #2a303c;
  --text: #e8e6de;
  --text-dim: #8b93a1;
  --purple: #a855f7;
  --purple-dim: #5b3a8c;
  --teal: #4fd1c5;
  --night: #5b6478;
  --font-display: 'IBM Plex Mono', 'Courier New', monospace;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --radius: 10px;
  --flip-duration: 340ms;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  min-height: 100vh;
}

body {
  background-image:
    radial-gradient(1px 1px at 20% 30%, rgba(232,230,222,0.25) 0, transparent 40%),
    radial-gradient(1px 1px at 70% 15%, rgba(232,230,222,0.18) 0, transparent 40%),
    radial-gradient(1px 1px at 85% 60%, rgba(232,230,222,0.15) 0, transparent 40%),
    radial-gradient(1px 1px at 40% 80%, rgba(232,230,222,0.15) 0, transparent 40%),
    radial-gradient(1px 1px at 10% 65%, rgba(232,230,222,0.12) 0, transparent 40%);
}

main {
  max-width: 1180px;
  margin: 0 auto;
  padding: 56px 24px 40px;
}

.masthead {
  text-align: center;
  margin-bottom: 48px;
}

.eyebrow {
  font-family: var(--font-display);
  font-size: 0.75rem;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--purple);
  margin-bottom: 14px;
}

.masthead h1 {
  font-family: var(--font-body);
  font-weight: 700;
  font-size: clamp(2.2rem, 5vw, 3.4rem);
  letter-spacing: -0.02em;
  margin: 0 0 12px;
}

.sub {
  font-family: var(--font-display);
  font-size: 0.9rem;
  color: var(--text-dim);
  letter-spacing: 0.02em;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 20px;
}

.clock-card {
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: var(--radius);
  padding: 22px 20px 18px;
  border-top: 3px solid var(--night);
  transition: transform 180ms ease, box-shadow 180ms ease, border-top-color 180ms ease;
}

.clock-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 10px 24px rgba(0,0,0,0.35);
}

.clock-card[data-period="day"] {
  border-top-color: var(--teal);
}

.clock-card__top {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 16px;
}

.clock-card__city {
  font-weight: 600;
  font-size: 1rem;
  letter-spacing: 0.01em;
}

.clock-card__badge {
  font-family: var(--font-display);
  font-size: 0.65rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--bg);
  background: var(--purple);
  border-radius: 3px;
  padding: 2px 6px;
}

.clock-card__time {
  --digit-size: 1.9rem;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.05em;
  margin-bottom: 14px;
  user-select: none;
}

.flap {
  position: relative;
  width: 0.72em;
  height: 1.32em;
  font-size: var(--digit-size);
  font-family: var(--font-display);
  font-weight: 500;
  perspective: 300px;
}

.flap__card {
  position: relative;
  width: 100%;
  height: 100%;
  transform-style: preserve-3d;
  transition: transform var(--flip-duration) cubic-bezier(0.4, 0, 0.2, 1);
}

.flap__card--flip {
  transform: rotateX(-180deg);
}

.flap__face {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #10131a;
  border: 1px solid var(--panel-border);
  border-radius: 4px;
  color: var(--purple);
  backface-visibility: hidden;
}

.flap__face--back {
  transform: rotateX(180deg);
}

.flap__face::after {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  top: 50%;
  height: 1px;
  background: rgba(0,0,0,0.5);
}

.flap-colon {
  font-family: var(--font-display);
  font-size: var(--digit-size);
  color: var(--purple-dim);
  padding: 0 1px;
  animation: blink 2s steps(1) infinite;
}

@keyframes blink {
  50% { opacity: 0.25; }
}

.clock-card__meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-family: var(--font-display);
  font-size: 0.72rem;
  color: var(--text-dim);
}

.clock-card__period {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.clock-card__period .dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--night);
}

.clock-card[data-period="day"] .dot {
  background: var(--teal);
  box-shadow: 0 0 6px var(--teal);
}

footer {
  text-align: center;
  padding: 32px 24px 48px;
  font-size: 0.82rem;
  color: var(--text-dim);
  border-top: 1px solid var(--panel-border);
  margin-top: 40px;
}

footer a {
  color: var(--purple);
  text-decoration: none;
}

footer a:hover,
footer a:focus-visible {
  text-decoration: underline;
}

footer a:focus-visible {
  outline: 2px solid var(--purple);
  outline-offset: 3px;
  border-radius: 2px;
}

.home-link {
  display: none;
  font-family: var(--font-display);
  font-size: 0.8rem;
  color: var(--purple);
  text-decoration: none;
  margin-top: 6px;
}

.home-link:hover,
.home-link:focus-visible {
  text-decoration: underline;
}

@media (max-width: 480px) {
  .clock-card__time { --digit-size: 1.5rem; }
  main { padding: 40px 16px 32px; }
}

@media (prefers-reduced-motion: reduce) {
  .flap__card { transition: none; }
  .flap-colon { animation: none; }
  .clock-card { transition: none; }
}