/* Computer Science @ Bonner/Prendie — site styles
   Built for Chromebook screens (~1366x768): big text, big tap targets. */

:root {
  --bg: #f6f7fb;
  --surface: #ffffff;
  --text: #16203a;
  --muted: #5b6785;
  --accent: #2457ff;
  --accent-dark: #163ec4;
  --border: #dfe3ee;
  --shadow: 0 2px 6px rgba(22, 32, 58, 0.06), 0 12px 32px rgba(22, 32, 58, 0.08);
  --shadow-hover: 0 4px 10px rgba(36, 87, 255, 0.12), 0 20px 44px rgba(36, 87, 255, 0.18);
  --radius: 1.25rem;
}

* {
  box-sizing: border-box;
}

html {
  font-size: 20px;
  font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
}

a {
  color: var(--accent);
}

.page {
  max-width: 72rem;
  margin: 0 auto;
  padding: 3rem 2rem 4rem;
}

/* Header */

.site-header {
  margin-bottom: 3rem;
}

.site-header h1 {
  font-size: clamp(2.5rem, 6vw, 4.25rem);
  font-weight: 900;
  line-height: 1.05;
  letter-spacing: -0.02em;
  margin: 0;
}

.site-header h1 .school {
  display: block;
  font-size: 0.5em;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--muted);
  margin-top: 0.35em;
}

.site-header h1 .at {
  color: var(--accent);
}

.site-header p {
  font-size: 1.25rem;
  color: var(--muted);
  margin: 1rem 0 0;
}

/* Card grid */

.cards {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(18rem, 1fr));
  gap: 2rem;
}

.card {
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  min-height: 14rem;
  padding: 2rem;
  background: var(--surface);
  border: 2px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  color: var(--text);
  text-decoration: none;
  transition: transform 150ms ease, box-shadow 150ms ease, border-color 150ms ease;
}

.card:hover {
  transform: translateY(-4px);
  border-color: var(--accent);
  box-shadow: var(--shadow-hover);
}

.card:focus-visible {
  outline: 4px solid var(--accent);
  outline-offset: 4px;
  border-color: var(--accent);
}

.card:active {
  transform: translateY(-1px);
}

/* Card artwork: sits above the text and fills the spare height */

.card-art {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.25rem;
}

/* Color wheel: a hue ring around a saturation/brightness square,
   the same picker used in the Color Picker lab. */

.art-wheel {
  position: relative;
  width: 7.5rem;
  height: 7.5rem;
  transition: transform 150ms ease;
}

.card:hover .art-wheel {
  transform: rotate(-12deg) scale(1.05);
}

.art-wheel-ring {
  position: absolute;
  inset: 0;
  border-radius: 50%;
  background: conic-gradient(#f00, #ff0, #0f0, #0ff, #00f, #f0f, #f00);
  -webkit-mask: radial-gradient(circle closest-side, transparent 68%, #000 69.5%);
  mask: radial-gradient(circle closest-side, transparent 68%, #000 69.5%);
}

.art-wheel-square {
  position: absolute;
  width: 44%;
  height: 44%;
  left: 28%;
  top: 28%;
  border-radius: 0.3rem;
  background:
    linear-gradient(to top, #000, transparent),
    linear-gradient(to right, #fff, hsl(226, 100%, 50%));
}

.card-subtitle {
  font-size: 1rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent);
  margin: 0 0 0.5rem;
}

.card-title {
  font-size: 2rem;
  font-weight: 800;
  line-height: 1.15;
  margin: 0;
}

/* Lab pages */

.back-link {
  display: inline-block;
  font-size: 1.1rem;
  font-weight: 600;
  text-decoration: none;
  margin-bottom: 2rem;
  padding: 0.5rem 0;
}

.back-link:hover {
  text-decoration: underline;
}

.lab-intro {
  font-size: 1.35rem;
  color: var(--muted);
  max-width: 40rem;
}

@media (max-width: 600px) {
  html {
    font-size: 18px;
  }

  .page {
    padding: 2rem 1.25rem 3rem;
  }

  .card {
    min-height: 10rem;
    padding: 1.5rem;
  }
}