:root {
  --bg: #003b46; /* Warm Charcoal looks good too: #1e1e1e  */
  --text: #eae2b7;
  --clock-bg: #1e1e1e;
  --accent: #d62828;
  --highlight: #f77f00;
  --light-bg: #fefae0;
  --light-text: #003049;
  --light-clock: #ffffff;
}

.logo-icon {
  height: 1.4em;
  vertical-align: middle;
  margin-right: 0.5em;
}

body.light {
  --bg: var(--light-bg);
  --text: var(--light-text);
  --clock-bg: var(--light-clock);
}

body {
  background-color: var(--bg);
  color: var(--text);
  font-family: "Segoe UI", sans-serif;
  margin: 0;
  padding: 20px;
  transition: background 0.3s ease, color 0.3s ease;
}

header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 1000px;
  margin: auto;
  padding-bottom: 20px;
  padding-left: 10px;
  padding-right: 10px;
}

h1 {
  font-size: 1.8rem;
  margin: 0;
}

#toggleTheme {
  font-size: 1.2rem;
  padding: 5px 10px;
  background: var(--clock-bg);
  color: var(--text);
  border: 2px solid var(--highlight);
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.3s ease;
}

#toggleTheme:hover {
  background-color: var(--accent);
  color: #fff;
}

.clocks {
  display: grid;
  grid-template-columns: repeat(2, 1fr); /* Always 2 columns minimum */
  gap: 20px;
  max-width: 1200px;
  margin: auto;
  padding: 10px;
}

.clock {
  background: var(--clock-bg);
  border-radius: 10px;
  padding: 20px;
  font-size: 1.5rem;
  box-shadow: 0 0 10px #00000033;
  border: 1px solid var(--highlight);
  transition: background 0.3s ease;
}

.zone {
  margin-top: 10px;
  font-size: 0.9rem;
  color: var(--text);
  line-height: 1.2;
}

@media (min-width: 768px) {
  .clocks {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (min-width: 1024px) {
  .clocks {
    grid-template-columns: repeat(4, 1fr);
  }
}

.footer {
  text-align: center;
  padding: 1em;
  font-size: 0.9em;
  color: var(--text-color);
  opacity: 0.7;
  margin-top: 2em;
}

.footer a {
  color: var(--text-color);
  text-decoration: underline;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.footer-credit,
.footer-link {
  margin-top: 8px;
}

.footer a {
  color: var(--text);
  text-decoration: underline;
}