:root {
  --bg: #ffffff;
  --text: #000000;
  --muted: #555555;
  --border: #e5e5e5;
  --card-bg: #ffffff;
  --shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
  --accent: #0057ff;
}

[data-theme="dark"] {
  --bg: #0f1116;
  --text: #f5f5f5;
  --muted: #c0c0c0;
  --border: #1f2630;
  --card-bg: #161b22;
  --shadow: 0 2px 12px rgba(0, 0, 0, 0.35);
  --accent: #5aa9ff;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Inter", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text);
  min-width: 360px;
}

header {
  padding: 16px;
  border-bottom: 1px solid var(--border);
  background: var(--card-bg);
  position: sticky;
  top: 0;
  z-index: 5;
}

.header-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  max-width: 1200px;
  margin: 0 auto;
}

h1 {
  margin: 0;
  font-size: 1.4rem;
}

main {
  max-width: 1200px;
  margin: 0 auto;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
}

.card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 16px;
  box-shadow: var(--shadow);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.card:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

.card-title {
  font-size: 0.95rem;
  margin-bottom: 6px;
  color: var(--muted);
}

.card-value {
  font-size: 1.4rem;
  font-weight: 700;
}

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

section h2 {
  margin: 0 0 12px;
  font-size: 1.1rem;
  color: var(--text);
}

small, .muted {
  color: var(--muted);
}

.progress {
  width: 100%;
  height: 8px;
  background: var(--border);
  border-radius: 6px;
  overflow: hidden;
  margin-top: 8px;
}

.progress span {
  display: block;
  height: 100%;
  background: var(--accent);
}

#trend-charts {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 16px;
  box-shadow: var(--shadow);
}

#trend-charts canvas {
  width: 100%;
  max-width: 100%;
  height: 200px;
  display: block;
  margin-bottom: 16px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg);
}

#alerts {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 16px;
  box-shadow: var(--shadow);
}

.alerts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 12px;
}

.alert {
  padding: 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg);
}

button {
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  padding: 10px 14px;
  border-radius: 8px;
  cursor: pointer;
  font-weight: 600;
  transition: background 0.2s ease, color 0.2s ease, box-shadow 0.2s ease;
}

button:hover {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 4px 10px rgba(0, 87, 255, 0.2);
}

footer {
  text-align: center;
  padding: 16px;
  color: var(--muted);
  border-top: 1px solid var(--border);
  margin-top: 16px;
}

@media (max-width: 480px) {
  h1 {
    font-size: 1.2rem;
  }

  #trend-charts canvas {
    height: 180px;
  }
}

@media (min-width: 1440px) {
  #trend-charts canvas {
    height: 240px;
  }
}