/* =====================================================
   /learn/tetris/ — course-specific styles
   Scoped to .course-* and .tetris-* / .curriculum.
   Reuses tokens from /style.css (do not redefine).
   ===================================================== */

/* ---------- Hero ---------- */
.course-hero {
  padding-top: 140px;
  padding-bottom: clamp(56px, 8vw, 96px);
}
.course-hero__inner {
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.course-hero__title {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(44px, 7vw, 84px);
  line-height: 1.05;
  letter-spacing: -0.02em;
  margin: 12px 0 28px;
  font-variation-settings: "opsz" 144;
}

.course-hero__lead {
  font-size: 1.15rem;
  line-height: 1.75;
  color: var(--fg);
  max-width: 56ch;
  margin: 0 0 40px;
}

.course-hero__meta {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 20px 32px;
  margin: 0 0 40px;
  padding: 24px 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
.course-hero__meta > div {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.course-hero__meta dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}
.course-hero__meta dd {
  font-family: var(--font-body);
  font-size: 0.95rem;
  margin: 0;
  color: var(--fg);
}

.course-hero__status {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--muted);
  margin: 0;
  display: inline-flex;
  align-items: center;
  gap: 10px;
}
.course-hero__status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent);
  flex-shrink: 0;
}

/* ---------- Section scaffolding ---------- */
.course-section {
  padding-block: clamp(64px, 8vw, 112px);
}
.course-section--bordered {
  border-top: 1px solid var(--border);
}
.course-section__inner {
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.course-prose {
  max-width: 60ch;
}
.course-prose p {
  font-size: 1.05rem;
  line-height: 1.85;
  color: var(--fg);
  margin: 0 0 18px;
}
.course-prose p:last-child { margin-bottom: 0; }
.course-prose code,
.course-api code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  background: #F1EFEA;
  padding: 2px 6px;
  border-radius: 3px;
}
.course-prose strong {
  font-weight: 500;
  color: var(--fg);
  background: linear-gradient(transparent 70%, rgba(255, 90, 31, 0.22) 70%);
  padding: 0 2px;
}
.course-prose a {
  color: var(--fg);
  text-decoration-color: var(--accent);
}
.course-prose a:hover { color: var(--accent); }

/* ---------- Preview (static Tetris mock) ---------- */
.course-preview {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  align-items: center;
  margin-top: 24px;
}
@media (min-width: 720px) {
  .course-preview {
    grid-template-columns: auto 1fr;
    gap: 48px;
  }
}

.tetris-board {
  display: grid;
  grid-template-columns: repeat(10, 1fr);
  gap: 2px;
  width: 100%;
  max-width: 320px;
  aspect-ratio: 10 / 20;
  padding: 8px;
  background: #1A1A1A;
  border-radius: 6px;
  justify-self: start;
}

.tetris-cell {
  background: #26221E;
  border-radius: 1px;
}

/* Piece colors — muted palette, in keeping with site tone */
.tetris-cell--i { background: #6FB7BD; }
.tetris-cell--o { background: #D7BA5A; }
.tetris-cell--t { background: #A97FB5; }
.tetris-cell--s { background: #7FAE6A; }
.tetris-cell--z { background: #C86A6A; }
.tetris-cell--l { background: #D79A5A; }
.tetris-cell--j { background: #6A8AC8; }

.course-preview__caption {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--muted);
  line-height: 1.7;
}
.course-preview__score {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin: 0 0 24px;
}
.course-preview__score span {
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
}
.course-preview__score strong {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: 2.5rem;
  color: var(--fg);
  line-height: 1;
  font-variation-settings: "opsz" 72;
}
.course-preview__note {
  margin: 0;
  max-width: 28ch;
}

/* ---------- Code block ---------- */
.course-code {
  margin-top: 40px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: #FDFCFA;
  overflow: hidden;
  max-width: 720px;
}
.course-code__label {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 16px;
  border-bottom: 1px solid var(--border);
  background: #F4F2EC;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}
.course-code__filename {
  text-transform: none;
  letter-spacing: 0;
  color: var(--fg);
}
.course-code__body {
  display: block;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.7;
  padding: 20px 24px;
  overflow-x: auto;
  color: var(--fg);
  background: transparent;
  white-space: pre;
}
.course-code__body .k { color: #A04545; }     /* keywords */
.course-code__body .t { color: #3D6E88; }     /* types */
.course-code__body .n { color: #7A6A2E; }     /* numbers */
.course-code__body .c { color: var(--muted); font-style: italic; }  /* comments */
.course-code__body .a { color: #6F4E8E; }     /* annotations */
.course-code__body .f { color: #3D6E88; font-weight: 500; } /* static fields like Color.RED */

/* ---------- Curriculum grid ---------- */
.curriculum {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  border-top: 1px solid var(--border);
}
@media (min-width: 720px) {
  .curriculum {
    grid-template-columns: repeat(2, 1fr);
  }
}
@media (min-width: 1100px) {
  .curriculum {
    grid-template-columns: repeat(3, 1fr);
  }
}

.curriculum__step {
  padding: 28px 24px 28px 0;
  border-bottom: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin: 0;
}
@media (min-width: 720px) {
  .curriculum__step:nth-child(2n) { padding-left: 24px; border-left: 1px solid var(--border); }
}
@media (min-width: 1100px) {
  .curriculum__step {
    padding-left: 24px;
    border-left: 1px solid var(--border);
  }
  .curriculum__step:nth-child(3n+1) {
    padding-left: 0;
    border-left: none;
  }
}

.curriculum__index {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0;
}
.curriculum__title {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: 1.4rem;
  line-height: 1.2;
  margin: 0;
  font-variation-settings: "opsz" 36;
}
.curriculum__goal {
  font-size: 0.95rem;
  line-height: 1.65;
  color: var(--fg);
  margin: 0;
}
.curriculum__learn {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--muted);
  margin: 4px 0 0;
}

/* ---------- API table ---------- */
.course-api {
  margin: 32px 0 0;
  display: flex;
  flex-direction: column;
  gap: 0;
  border-top: 1px solid var(--border);
}
.course-api > div {
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
  padding: 20px 0;
  border-bottom: 1px solid var(--border);
}
@media (min-width: 720px) {
  .course-api > div {
    grid-template-columns: 200px 1fr;
    gap: 32px;
    align-items: baseline;
  }
}
.course-api dt {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--fg);
}
.course-api dt code {
  background: transparent;
  padding: 0;
  font-size: 1em;
}
.course-api dd {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- Start CTA ---------- */
.course-start {
  margin-top: 16px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  align-items: flex-start;
}
.course-start__cta {
  display: inline-flex;
  align-items: baseline;
  gap: 14px;
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--fg);
  padding: 14px 20px;
  border: 1px solid var(--border);
  border-radius: 4px;
  transition: border-color 180ms var(--ease), color 180ms var(--ease), background 180ms var(--ease);
}
.course-start__cta:hover {
  color: var(--accent);
  border-color: var(--accent);
}
.course-start__cta--disabled {
  color: var(--muted);
  pointer-events: none;
  background: #F4F2EC;
}
.course-start__note {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--muted);
  margin: 0;
}