:root {
  color-scheme: light dark;
  --bg: #f4f6f9;
  --bg-gradient: radial-gradient(circle at 15% 0%, #e8f0fe 0%, #f4f6f9 45%);
  --fg: #111827;
  --fg-muted: #6b7280;
  --card-bg: #ffffff;
  --card-border: #e5e9f0;
  --card-shadow: 0 1px 2px rgba(16, 24, 40, 0.04), 0 8px 24px -8px rgba(16, 24, 40, 0.08);
  --panel-bg: #ffffff;
  --accent: #3b82f6;
  --accent-2: #6366f1;
  --chip-bg: #f1f5f9;
  --chart-grid: #e5e9f0;
  --chart-text: #6b7280;
  --input-bg: #ffffff;
  --input-border: #d7dce3;
  --error: #dc2626;
  /* Set at runtime by dashboard.js from data-bg-light/data-bg-dark on
     <body>, when the operator has dropped a custom image into the custom
     assets dir (see README). */
  --bg-light-url: none;
  --bg-dark-url: none;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b0e14;
    --bg-gradient: radial-gradient(circle at 15% 0%, #131a2a 0%, #0b0e14 45%);
    --fg: #e8eaed;
    --fg-muted: #9aa4b2;
    --card-bg: #131720;
    --card-border: #232936;
    --card-shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 8px 24px -8px rgba(0, 0, 0, 0.5);
    --panel-bg: #131720;
    --accent: #60a5fa;
    --accent-2: #818cf8;
    --chip-bg: #1b2130;
    --chart-grid: #232936;
    --chart-text: #9aa4b2;
    --input-bg: #0f131b;
    --input-border: #2a3140;
    --error: #f87171;
  }
}

* { box-sizing: border-box; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--fg);
  background-color: var(--bg);
  background-image: var(--bg-light-url), var(--bg-gradient);
  background-size: cover;
  background-position: center;
  background-attachment: fixed;
  background-repeat: no-repeat;
  margin: 0;
  -webkit-font-smoothing: antialiased;
}

@media (prefers-color-scheme: dark) {
  body {
    background-image: var(--bg-dark-url), var(--bg-gradient);
  }
}

.page {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 1.5rem 4rem;
}

.topbar {
  padding: 2.5rem 0 1rem;
}

.banner {
  margin-top: 1.25rem;
  border-radius: 16px;
  overflow: hidden;
  border: 1px solid var(--card-border);
  box-shadow: var(--card-shadow);
}

.banner img {
  display: block;
  width: 100%;
  height: 220px;
  object-fit: cover;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.9rem;
}

.brand-icon {
  font-size: 2.25rem;
  line-height: 1;
}

h1 {
  margin: 0;
  font-size: 1.6rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.subtitle {
  margin: 0.15rem 0 0;
  color: var(--fg-muted);
  font-size: 0.9rem;
}

h2 {
  font-size: 1.05rem;
  font-weight: 600;
  margin: 0 0 1rem;
  letter-spacing: -0.01em;
}

section { margin-top: 2.5rem; }

.hint {
  color: var(--fg-muted);
  font-size: 0.9rem;
}

.hint.error { color: var(--error); }

/* Current readings */

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 1rem;
}

.card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 14px;
  box-shadow: var(--card-shadow);
  padding: 1.25rem 1.3rem;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.card:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 8px rgba(16, 24, 40, 0.06), 0 16px 32px -12px rgba(16, 24, 40, 0.14);
}

.card-header {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin-bottom: 0.75rem;
}

.card-header h3 {
  margin: 0;
  font-size: 0.95rem;
  font-weight: 600;
}

.card-icon {
  display: inline-flex;
  color: var(--accent);
  background: color-mix(in srgb, var(--accent) 14%, transparent);
  border-radius: 9px;
  padding: 0.4rem;
  flex-shrink: 0;
}

.card-icon svg { width: 18px; height: 18px; }

.hero-metric {
  display: flex;
  align-items: baseline;
  gap: 0.3rem;
  margin-bottom: 0.8rem;
}

.hero-value {
  font-size: 2.1rem;
  font-weight: 700;
  letter-spacing: -0.03em;
}

.hero-unit {
  font-size: 1rem;
  color: var(--fg-muted);
  font-weight: 500;
}

.chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 0.9rem;
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  background: var(--chip-bg);
  color: var(--fg-muted);
  border-radius: 999px;
  padding: 0.3rem 0.6rem 0.3rem 0.45rem;
  font-size: 0.78rem;
  font-weight: 500;
}

.chip svg { width: 13px; height: 13px; }

.card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 0.7rem;
  border-top: 1px solid var(--card-border);
  color: var(--fg-muted);
  font-size: 0.75rem;
}

.battery {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
}

.battery svg { width: 14px; height: 14px; }

/* History panel */

.panel {
  background: var(--panel-bg);
  border: 1px solid var(--card-border);
  border-radius: 14px;
  box-shadow: var(--card-shadow);
  padding: 1.1rem 1.3rem;
  display: flex;
  flex-wrap: wrap;
  gap: 1.1rem;
  align-items: end;
  margin-bottom: 1.25rem;
}

.panel label {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  font-size: 0.78rem;
  color: var(--fg-muted);
  font-weight: 500;
}

.panel select,
.panel input {
  background: var(--input-bg);
  border: 1px solid var(--input-border);
  border-radius: 8px;
  padding: 0.5rem 0.65rem;
  color: var(--fg);
  font-size: 0.88rem;
  font-family: inherit;
}

.panel select:focus,
.panel input:focus {
  outline: 2px solid color-mix(in srgb, var(--accent) 40%, transparent);
  outline-offset: 1px;
}

button {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: white;
  border: none;
  border-radius: 8px;
  padding: 0.6rem 1.15rem;
  cursor: pointer;
  font-size: 0.88rem;
  font-weight: 600;
  box-shadow: 0 2px 6px -1px color-mix(in srgb, var(--accent) 45%, transparent);
  transition: filter 0.15s ease;
}

button:hover { filter: brightness(1.06); }
button:active { filter: brightness(0.96); }

.chart-panel {
  background: var(--panel-bg);
  border: 1px solid var(--card-border);
  border-radius: 14px;
  box-shadow: var(--card-shadow);
  padding: 1rem;
}

canvas {
  display: block;
  width: 100%;
  height: auto;
}

footer {
  margin-top: 3rem;
  text-align: center;
  color: var(--fg-muted);
  font-size: 0.78rem;
}
