/* ===========================
   Angular Signals Course — Course-Specific Styles
   =========================== */

/* Course-specific demo variables */
:root[data-theme="dark"] {
  --signal-demo-bg: #2c313a;
  --signal-demo-border: #4b5263;
  --signal-value: #00e5ff;
  --signal-stale: #e06c75;
  --signal-computed: #61afef;
  --signal-invalidation: #ff6b2b;
}

:root[data-theme="light"] {
  --signal-demo-bg: #f9f8f3;
  --signal-demo-border: #d4d0c8;
  --signal-value: #0891b2;
  --signal-stale: #dc2626;
  --signal-computed: #1a73e8;
  --signal-invalidation: #d4520a;
}

/* Comparison tables — slightly tighter for side-by-side code */
.comparison-table {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin: 1.5rem 0;
}

.comparison-table .code-wrapper {
  margin: 0;
}

.comparison-label {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--muted);
  margin-bottom: 0.3rem;
  font-weight: 600;
}

@media (max-width: 700px) {
  .comparison-table {
    grid-template-columns: 1fr;
  }
}

/* ===========================
   Try It Yourself — Exercise Blocks
   =========================== */

.exercise {
  margin: 2rem 0;
  padding: 1.5rem;
  border: 2px solid var(--signal-computed, #1a73e8);
  border-radius: 8px;
  background: var(--signal-demo-bg, #f9f8f3);
}

.exercise h3 {
  margin-top: 0;
  font-size: 1rem;
  color: var(--signal-computed, #1a73e8);
}

.exercise p {
  margin: 0.75rem 0;
}

.exercise ol,
.exercise ul {
  margin: 0.5rem 0 1rem 1.5rem;
}


/* Reveal content — animated open/close */
.exercise .reveal-content {
  display: grid;
  grid-template-rows: 0fr;
  opacity: 0;
  transition: grid-template-rows 0.4s ease, opacity 0.3s ease 0.05s;
}

.exercise .reveal-content.is-open {
  grid-template-rows: 1fr;
  opacity: 1;
}

.exercise .reveal-content > .reveal-inner {
  overflow: hidden;
  min-height: 0;
  padding-top: 0;
}

.exercise .reveal-content.is-open > .reveal-inner {
  padding-top: 0.75rem;
}

.exercise .reveal-toggle {
  cursor: pointer;
  font-weight: 600;
  color: var(--signal-computed, #1a73e8);
  user-select: none;
  background: none;
  border: none;
  padding: 0;
  font-size: inherit;
  font-family: inherit;
  margin-top: 1.25rem;
  border-top: 1px solid var(--border, #d4d0c8);
  padding-top: 1rem;
  display: block;
  width: 100%;
  text-align: left;
}

.exercise .reveal-toggle::before {
  content: '\25B6';
  display: inline-block;
  margin-right: 0.5rem;
  font-size: 0.75rem;
  transition: transform 0.3s ease;
}

.exercise .reveal-toggle.is-open::before {
  transform: rotate(90deg);
}

.exercise .reveal-toggle:hover {
  text-decoration: underline;
}

.exercise .code-wrapper {
  margin: 0.75rem 0 0;
}

/* ===========================
   Coming Soon — Unavailable Lessons
   =========================== */

.lesson-list .coming-soon a,
.lesson-list .coming-soon span.lesson-title {
  color: var(--muted);
  pointer-events: none;
  text-decoration: none;
}

.lesson-list .coming-soon::after {
  content: "coming soon";
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--muted);
  background: var(--bg-surface);
  padding: 0.15em 0.5em;
  border-radius: 3px;
  margin-left: 0.5rem;
  vertical-align: middle;
}

.sidebar li.coming-soon a {
  color: var(--muted);
  opacity: 0.5;
  pointer-events: none;
}

.reference-list .coming-soon a {
  color: var(--muted);
  pointer-events: none;
  text-decoration: none;
}

.reference-list .coming-soon::after {
  content: "coming soon";
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--muted);
  background: var(--bg-surface);
  padding: 0.15em 0.5em;
  border-radius: 3px;
  margin-left: 0.5rem;
}