/* GNS 430 Learning Academy — separate from the unit faceplate. */

:root {
  --bg: #0c0f14;
  --surface: #151a22;
  --surface-2: #1c232e;
  --border: #2a3340;
  --text: #e8e6e0;
  --muted: #9aa3b0;
  --accent: #6ecddd;
  --accent-2: #69bd45;
  --warn: #f0c84a;
  --danger: #e07070;
  --article: #6eb5ff;
  --tutorial: #3fd67a;
  --quiz: #f0c84a;
  --practice: #d987e0;
  --radius: 12px;
  --mono: "SF Mono", ui-monospace, Menlo, Consolas, monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.55 var(--sans);
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* Overall progress pill in the shared shell header */
.progress-pill {
  font: 0.8rem/1 var(--mono);
  color: var(--accent-2);
  background: rgba(63, 214, 122, 0.1);
  border: 1px solid rgba(63, 214, 122, 0.25);
  padding: 6px 10px;
  border-radius: 999px;
  margin-left: auto;
}
.progress-pill:empty { display: none; }
.app-shell .progress-pill + .shell-tabs { margin-left: 0; }
.btn {
  appearance: none;
  border: 1px solid var(--border);
  background: var(--surface-2);
  color: var(--text);
  border-radius: 8px;
  padding: 8px 14px;
  font: inherit;
  cursor: pointer;
}
.btn:hover { border-color: var(--accent); color: var(--accent); }
.btn.primary {
  background: rgba(94, 200, 224, 0.15);
  border-color: rgba(94, 200, 224, 0.45);
  color: var(--accent);
}
.btn.primary:hover { background: rgba(94, 200, 224, 0.25); }

.layout {
  display: grid;
  grid-template-columns: 280px 1fr;
  min-height: calc(100vh - 58px);
}
@media (max-width: 900px) {
  .layout { grid-template-columns: 1fr; }
  .sidebar { border-right: none; border-bottom: 1px solid var(--border); max-height: 40vh; overflow: auto; }
}

.sidebar {
  border-right: 1px solid var(--border);
  background: var(--surface);
  padding: 16px 12px 32px;
  overflow: auto;
  position: sticky;
  top: 56px;
  max-height: calc(100vh - 56px);
}
.sidebar h2 {
  margin: 0 12px 10px;
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
}
.chapter-block { margin-bottom: 14px; }
.chapter-head {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  width: 100%;
  text-align: left;
  background: transparent;
  border: none;
  color: var(--text);
  padding: 8px 10px;
  border-radius: 8px;
  cursor: pointer;
  font: inherit;
}
.chapter-head:hover { background: var(--surface-2); }
.chapter-head .num {
  font: 700 0.85rem/1.2 var(--mono);
  color: var(--accent);
  min-width: 1.5rem;
}
.chapter-head .meta { flex: 1; }
.chapter-head .title { font-weight: 600; font-size: 0.95rem; }
.chapter-head .blurb { display: block; font-size: 0.78rem; color: var(--muted); margin-top: 2px; }
.chapter-head .done-count {
  font: 0.72rem var(--mono);
  color: var(--accent-2);
  white-space: nowrap;
}
.item-list { list-style: none; margin: 0 0 0 8px; padding: 0 0 0 12px; border-left: 2px solid var(--border); }
.item-list li { margin: 0; }
.item-list a {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 8px;
  border-radius: 6px;
  color: var(--muted);
  font-size: 0.86rem;
  text-decoration: none;
}
.item-list a:hover { background: var(--surface-2); color: var(--text); text-decoration: none; }
.item-list a.active { background: var(--surface-2); color: var(--text); box-shadow: inset 3px 0 0 var(--accent); }
.item-list a.done { color: var(--text); }
.item-list .badge {
  font: 0.65rem/1 var(--mono);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 3px 5px;
  border-radius: 4px;
  flex-shrink: 0;
}
.badge.article { color: var(--article); background: rgba(110, 181, 255, 0.12); }
.badge.tutorial { color: var(--tutorial); background: rgba(63, 214, 122, 0.12); }
.badge.quiz { color: var(--quiz); background: rgba(240, 200, 74, 0.12); }
.badge.practice { color: var(--practice); background: rgba(217, 135, 224, 0.12); }
.check { color: var(--accent-2); font-size: 0.85rem; }

.main {
  padding: 28px 32px 64px;
  max-width: 820px;
}
@media (max-width: 600px) {
  .main { padding: 20px 16px 48px; }
}

.hero h1 { margin: 0 0 8px; font-size: 1.85rem; letter-spacing: -0.02em; }
.hero .lead { margin: 0 0 20px; color: var(--muted); font-size: 1.05rem; }
.hero .fine { margin: 0 0 24px; font-size: 0.85rem; color: var(--muted); }

.chapter-cards {
  display: grid;
  gap: 12px;
}
.chapter-card {
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: 0;
  padding: 0;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--surface);
  color: inherit;
  text-decoration: none;
  transition: border-color 0.15s, transform 0.15s, box-shadow 0.15s;
  overflow: hidden;
}
@media (max-width: 560px) {
  .chapter-card { grid-template-columns: 1fr; }
}
.chapter-card:hover {
  border-color: var(--accent);
  text-decoration: none;
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.35);
}
@media (prefers-reduced-motion: reduce) {
  .chapter-card, .chapter-card:hover { transition: none; transform: none; }
}
.chapter-media {
  position: relative;
  min-height: 110px;
  background: #0a1018;
}
.chapter-cover {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  min-height: 110px;
}
.chapter-thumb {
  position: absolute;
  right: 6px;
  bottom: 6px;
  width: 48%;
  max-width: 72px;
  border-radius: 2px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.5);
  image-rendering: pixelated;
  border: 1px solid rgba(255,255,255,0.12);
}
.chapter-body { padding: 14px 16px 16px; }
.chapter-card .n { font: 700 0.8rem var(--mono); color: var(--accent); }
.chapter-card h3 { margin: 4px 0 6px; font-size: 1.1rem; }
.chapter-card p { margin: 0; color: var(--muted); font-size: 0.9rem; }
.chapter-card .bar {
  margin-top: 12px;
  height: 4px;
  background: var(--border);
  border-radius: 2px;
  overflow: hidden;
}
.chapter-card .bar > i {
  display: block;
  height: 100%;
  background: var(--accent-2);
  border-radius: 2px;
}
.chapter-hero-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin: 16px 0 20px;
}
@media (max-width: 640px) {
  .chapter-hero-row { grid-template-columns: 1fr; }
}
.chapter-hero {
  margin: 0;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  background: #0a1018;
}
.chapter-hero img {
  display: block;
  width: 100%;
  height: auto;
}
.chapter-hero.lcd .lcd-shot {
  image-rendering: pixelated;
  image-rendering: crisp-edges;
  max-width: 100%;
  padding: 12px;
  box-sizing: border-box;
}
.chapter-hero figcaption {
  padding: 8px 12px;
  font-size: 0.8rem;
  color: var(--muted);
  border-top: 1px solid var(--border);
  background: var(--surface);
}
/* Align learn layout under shared shell */
body { margin: 0; }
.layout { min-height: calc(100vh - 56px); }

.crumb {
  font-size: 0.85rem;
  color: var(--muted);
  margin-bottom: 12px;
}
.crumb a { color: var(--muted); }
.crumb a:hover { color: var(--accent); }

.content-type {
  display: inline-block;
  font: 0.7rem/1 var(--mono);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 4px 8px;
  border-radius: 4px;
  margin-bottom: 10px;
}
.content h1 { margin: 0 0 8px; font-size: 1.65rem; }
.content .summary { color: var(--muted); font-size: 1.05rem; margin: 0 0 8px; }
.content .minutes { font: 0.8rem var(--mono); color: var(--muted); margin-bottom: 24px; }

.section { margin: 0 0 26px; }
.section h2 {
  margin: 0 0 10px;
  padding-bottom: 6px;
  font-size: 1.15rem;
  color: var(--accent);
  border-bottom: 1px solid rgba(94, 200, 224, 0.15);
}
.section p { margin: 0 0 10px; max-width: 68ch; }

.figure {
  margin: 18px 0;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: linear-gradient(160deg, #0a1520 0%, #0d1a28 50%, #0a121c 100%);
  overflow: hidden;
}
.figure-canvas {
  min-height: 140px;
  padding: 20px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 10px;
}
.figure-canvas .chip {
  font: 0.8rem var(--mono);
  color: var(--accent-2);
  border: 1px dashed rgba(63, 214, 122, 0.4);
  padding: 8px 12px;
  border-radius: 6px;
  background: rgba(0, 0, 0, 0.25);
}
.figure-canvas .flow-arrow { color: var(--muted); font-size: 1.2rem; }
.figure figcaption {
  margin: 0;
  padding: 10px 14px;
  border-top: 1px solid var(--border);
  font-size: 0.85rem;
  color: var(--muted);
  background: var(--surface);
}

/* Real unit LCD screenshots (3× palette framebuffer PNGs) */
.figure-shot-wrap {
  padding: 16px;
  background: #05080c;
}

/* Full-bezel photographs (faceplate) — natural rendering, no pixel scaling */
.figure-photo img {
  display: block;
  width: 100%;
  height: auto;
  background: #05080c;
}
.lcd-shot {
  display: block;
  width: 100%;
  max-width: 720px;
  height: auto;
  margin: 0 auto;
  image-rendering: pixelated;
  image-rendering: crisp-edges;
  border-radius: 2px;
  box-shadow: 0 0 0 1px rgba(0, 0, 0, 0.6), 0 8px 24px rgba(0, 0, 0, 0.45);
}

.tut-step {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 18px;
  margin-bottom: 14px;
  background: var(--surface);
}
.tut-step .step-n {
  font: 700 0.75rem var(--mono);
  color: var(--tutorial);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.tut-step h3 { margin: 4px 0 8px; font-size: 1.05rem; }
.tut-step p { margin: 0; color: var(--text); }

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 28px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
}

/* Quiz */
.quiz-q {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 18px;
  margin-bottom: 14px;
  background: var(--surface);
}
.quiz-q h3 { margin: 0 0 12px; font-size: 1.05rem; }
.quiz-q label {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  padding: 8px 10px;
  border-radius: 8px;
  margin-bottom: 6px;
  cursor: pointer;
  border: 1px solid transparent;
}
.quiz-q label:hover { background: var(--surface-2); }
.quiz-q label.selected { border-color: var(--accent); background: rgba(94, 200, 224, 0.08); }
.quiz-q label.correct { border-color: var(--accent-2); background: rgba(63, 214, 122, 0.1); }
.quiz-q label.wrong { border-color: var(--danger); background: rgba(224, 112, 112, 0.1); }
.quiz-q input { margin-top: 3px; }
.explain {
  margin-top: 10px;
  padding: 10px 12px;
  border-radius: 8px;
  background: var(--surface-2);
  font-size: 0.9rem;
  color: var(--muted);
  display: none;
}
.explain.show { display: block; }
.quiz-result {
  padding: 16px 18px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--surface);
  margin-bottom: 16px;
}
.quiz-result.pass { border-color: rgba(63, 214, 122, 0.45); }
.quiz-result.fail { border-color: rgba(224, 112, 112, 0.45); }

.practice-card {
  border: 1px solid rgba(217, 135, 224, 0.35);
  background: rgba(217, 135, 224, 0.08);
  border-radius: var(--radius);
  padding: 20px;
}
.practice-card h2 { margin: 0 0 8px; }
.practice-card p { color: var(--muted); margin: 0 0 16px; }

.empty {
  color: var(--muted);
  padding: 40px 0;
}

.footer-note {
  margin-top: 48px;
  font-size: 0.8rem;
  color: var(--muted);
}