:root {
  --background: #ffffff;
  --card: #f5f5f5;
  --text: #333333;
  --accent: #1a5f7a;
  --wind-speed: #2196f3;
  --wind-gust: #e53935;
  --tide: #1a5f7a;
  --wave-green: #4caf50;
  --wave-amber: #ff9800;
  --wave-red: #f44336;
  --grid: #e0e0e0;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial,
    sans-serif;
  background: var(--background);
  color: var(--text);
}

.page {
  padding: 15px;
  min-height: 100vh;
}

.page-header h1 {
  font-size: 1.5rem;
  margin-bottom: 4px;
}

.subtitle {
  color: var(--accent);
  font-size: 0.9rem;
}

.section {
  margin-top: 18px;
}

.section h2 {
  font-size: 1.1rem;
  margin-bottom: 12px;
}

.grid {
  display: grid;
  gap: 12px;
}

.grid-2 {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.card {
  background: var(--card);
  border-radius: 10px;
  padding: 15px;
  text-align: center;
}

.card .label {
  font-size: 0.85rem;
  margin-bottom: 6px;
  color: var(--accent);
}

.card .value {
  font-size: 1.5rem;
  font-weight: bold;
}

.card .subvalue {
  font-size: 0.9rem;
  margin-top: 6px;
}

.card.wave {
  color: #fff;
}

.chart-card {
  margin-top: 12px;
  background: var(--card);
  padding: 20px;
  border-radius: 10px;
  overflow-x: auto;
}

.chart {
  min-width: 800px;
  height: 700px;
}

.footer {
  margin-top: 20px;
  text-align: center;
  font-size: 0.8rem;
  opacity: 0.7;
}

.alert {
  margin-top: 10px;
  padding: 10px 12px;
  background: #ffe8cc;
  border: 1px solid #ffb74d;
  border-radius: 8px;
  font-size: 0.9rem;
  color: #7a4b00;
}

.time-mismatch {
  background: #fff3cd;
  border-color: #ffe08a;
  color: #6d4c00;
}

details summary {
  list-style: none;
  cursor: pointer;
  padding: 15px;
  background: var(--card);
  border-radius: 10px;
  font-weight: bold;
  color: var(--accent);
  display: flex;
  gap: 10px;
  align-items: center;
}

details summary::before {
  content: "+ ";
  font-weight: bold;
}

details[open] summary::before {
  content: "- ";
}

@media (max-width: 768px) {
  .page {
    padding: 10px;
  }

  .page-header h1 {
    font-size: 1.3rem;
  }

  .section h2 {
    font-size: 1rem;
  }
}

@media (max-width: 480px) {
  .grid-2 {
    grid-template-columns: 1fr;
  }

  .card {
    padding: 12px;
  }
}