:root {
  --bg: #f5f6f7;
  --card: #ffffff;
  --text: #111827;
  --muted: #6b7280;
  --border: #e5e7eb;

  --shadow: 0 8px 24px rgba(0,0,0,.06);
  --radius: 14px;

  --gap: 16px;
  --gap-lg: 24px;

  --btn: #111827;
  --btn-text: #ffffff;
  --btn-2: #e5e7eb;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
}

.container {
  width: min(1100px, calc(100% - 32px));
  margin: 0 auto;
}

.site-header {
  padding: 28px 0 18px;
}
.site-title {
  margin: 0;
  font-size: clamp(22px, 2.4vw, 34px);
  letter-spacing: -0.02em;
}
.site-subtitle {
  margin: 8px 0 0;
  color: var(--muted);
}

.header-actions {
  margin-top: 14px;
  display: flex;
  gap: 12px;
  align-items: center;
  flex-wrap: wrap;
}
.meta { color: var(--muted); font-size: 14px; }

main.container {
  padding-bottom: 40px;
  display: grid;
  gap: var(--gap-lg);
}

/* Cards */
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 18px;
}

.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}
.card h2 { margin: 0; font-size: 18px; }
.card h3 { margin: 0 0 10px; font-size: 16px; }

/* Buttons */
.btn {
  appearance: none;
  border: 0;
  border-radius: 10px;
  padding: 10px 14px;
  background: var(--btn);
  color: var(--btn-text);
  font-weight: 600;
  cursor: pointer;
}
.btn:hover { filter: brightness(0.95); }
.btn-secondary {
  background: var(--btn-2);
  color: var(--text);
}

/* Hero */
.card-hero {
  display: grid;
  grid-template-columns: 1fr 180px;
  gap: 18px;
  align-items: center;
}



.hero-title { margin: 0; color: var(--muted); font-size: 14px; font-weight: 600; }
.hero-recommendation {
  margin: 6px 0 6px;
  font-size: 26px;
  font-weight: 800;
  letter-spacing: -0.02em;
}
.hero-support {
  margin: 0;
  color: var(--muted);
}
.dot { margin: 0 8px; }

.hero-traffic {
  display: grid;
  justify-items: center;
  gap: 10px;
}
.traffic-text {
  margin: 0;
  font-size: 13px;
  color: var(--muted);
  text-align: center;
}

/* Settings */
details { border-radius: 12px; }
.details-summary {
  cursor: pointer;
  font-weight: 700;
  list-style: none;
}
.details-summary::-webkit-details-marker { display: none; }

.settings-grid {
  margin-top: 14px;
  display: grid;
  gap: 16px;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.settings-group {
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 12px;
}
.settings-group legend {
  font-weight: 700;
  padding: 0 6px;
}

label {
  display: block;
  margin-top: 10px;
  font-size: 13px;
  color: var(--muted);
}
select, input {
  width: 100%;
  margin-top: 6px;
  padding: 10px 10px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: #fff;
  font-size: 14px;
}
.inline {
  display: flex;
  gap: 10px;
  align-items: center;
}
.inline input { flex: 1; }

.hint {
  margin: 10px 0 0;
  color: var(--muted);
  font-size: 13px;
}

/* Metric cards row */
.cards-3 {
  display: grid;
  gap: var(--gap);
  grid-template-columns: repeat(3, minmax(0, 1fr));
}
.metric-value {
  margin: 6px 0 4px;
  font-size: 34px;
  font-weight: 800;
  letter-spacing: -0.02em;
}
.unit { font-size: 14px; font-weight: 700; color: var(--muted); }
.metric-note { margin: 0; color: var(--muted); font-size: 13px; }

/* Chart */
.chart-wrap { padding-top: 8px; }
.small { margin: 10px 0 0; color: var(--muted); font-size: 12px; }
.chart-toggles label { color: var(--muted); font-size: 13px; margin-right: 10px; }

/* Prose */
.prose { margin-top: 12px; color: var(--text); }
.prose p, .prose li { color: var(--muted); }

/* Traffic light (kept, slightly refined) */
.traffic-light {
  width: 90px;
  height: 260px;
  background-color: #111827;
  border-radius: 18px;
  padding: 10px;
  display: flex;
  flex-direction: column;
  justify-content: space-around;
}
.light {
  width: 70px;
  height: 70px;
  border-radius: 50%;
  margin: 0 auto;
  background-color: #333;
  transition: background-color 0.25s ease;
}

/* Responsive */
@media (max-width: 960px) {
  .card-hero { grid-template-columns: 110px 1fr; }
  .hero-traffic { grid-column: 1 / -1; justify-items: start; }
  .settings-grid { grid-template-columns: 1fr; }
  .cards-3 { grid-template-columns: 1fr; }
}