:root {
  color-scheme: light;
  --bg: #f7f4ee;
  --surface: #ffffff;
  --ink: #202124;
  --muted: #656b75;
  --line: #ddd7ce;
  --blue: #2d6cdf;
  --green: #18794e;
  --amber: #a15c00;
  --coral: #b84d3f;
  --shadow: 0 18px 50px rgba(38, 34, 28, 0.12);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background:
    linear-gradient(90deg, rgba(45, 108, 223, 0.08) 1px, transparent 1px),
    linear-gradient(0deg, rgba(24, 121, 78, 0.07) 1px, transparent 1px),
    var(--bg);
  background-size: 44px 44px;
  color: var(--ink);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  letter-spacing: 0;
}

a {
  color: inherit;
  text-decoration: none;
}

.site-header,
.site-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
}

.site-header {
  min-height: 76px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
}

.brand-mark {
  display: grid;
  width: 34px;
  height: 34px;
  place-items: center;
  border-radius: 8px;
  background: var(--ink);
  color: white;
}

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.nav a {
  min-height: 36px;
  padding: 8px 12px;
  border-radius: 8px;
  color: var(--muted);
}

.nav a:hover {
  background: rgba(255, 255, 255, 0.72);
  color: var(--ink);
}

main {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
}

.dashboard {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(300px, 0.95fr);
  gap: 32px;
  align-items: stretch;
  min-height: 420px;
  padding: 42px 0 24px;
}

.overview,
.signal-panel,
.content-page {
  background: rgba(255, 255, 255, 0.88);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}

.overview {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: clamp(28px, 5vw, 56px);
}

.eyebrow {
  margin: 0 0 14px;
  color: var(--blue);
  font-size: 0.82rem;
  font-weight: 800;
  text-transform: uppercase;
}

h1,
h2,
p {
  margin-top: 0;
}

h1 {
  max-width: 720px;
  margin-bottom: 18px;
  font-size: clamp(2.25rem, 6vw, 4.8rem);
  line-height: 0.98;
}

h2 {
  margin-bottom: 8px;
  font-size: clamp(1.45rem, 3vw, 2.2rem);
}

.lead,
.content-page p,
.route-band p {
  color: var(--muted);
  font-size: 1.04rem;
  line-height: 1.75;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 18px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 10px 16px;
  border: 1px solid var(--ink);
  border-radius: 8px;
  font-weight: 800;
}

.button.primary {
  background: var(--ink);
  color: white;
}

.button.secondary {
  background: white;
}

.signal-panel {
  position: relative;
  display: grid;
  min-height: 320px;
  overflow: hidden;
  place-items: center;
}

#signal-canvas {
  width: 100%;
  height: 100%;
}

.signal-copy {
  position: absolute;
  right: 18px;
  bottom: 18px;
  display: grid;
  gap: 4px;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.9);
}

.signal-copy span {
  color: var(--muted);
  font-size: 0.82rem;
}

.status-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
  padding: 8px 0 42px;
}

.status-card {
  display: grid;
  min-height: 110px;
  align-content: space-between;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
}

.status-card span {
  color: var(--muted);
  font-size: 0.9rem;
}

.status-card strong {
  font-size: 1.35rem;
}

.status-card.good {
  border-top: 4px solid var(--green);
}

.status-card.muted {
  border-top: 4px solid var(--muted);
}

.status-card.warm {
  border-top: 4px solid var(--amber);
}

.status-card.cool {
  border-top: 4px solid var(--blue);
}

.route-band {
  display: grid;
  grid-template-columns: minmax(220px, 0.7fr) minmax(0, 1.3fr);
  gap: 24px;
  padding: 34px 0 64px;
  border-top: 1px solid var(--line);
}

.route-list {
  display: grid;
  gap: 10px;
  padding: 0;
  margin: 0;
  list-style: none;
}

.route-list li {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  min-height: 48px;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.82);
}

code {
  color: var(--coral);
  font-weight: 800;
}

.content-page {
  max-width: 820px;
  margin: 42px 0 72px;
  padding: clamp(28px, 5vw, 52px);
}

.site-footer {
  min-height: 72px;
  color: var(--muted);
  font-size: 0.92rem;
}

@media (max-width: 840px) {
  .site-header,
  .site-footer {
    align-items: flex-start;
    flex-direction: column;
    padding: 18px 0;
  }

  .dashboard,
  .route-band {
    grid-template-columns: 1fr;
  }

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

@media (max-width: 520px) {
  main,
  .site-header,
  .site-footer {
    width: min(100% - 24px, 1120px);
  }

  .status-grid {
    grid-template-columns: 1fr;
  }

  .route-list li {
    align-items: flex-start;
    flex-direction: column;
  }
}