/* ═══════════════════════════════════════
   LESSON PAGE STYLES
   ═══════════════════════════════════════ */

* { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --gold: #E8A020;
  --gold-light: #F5C040;
  --bg: #050508;
  --bg-card: rgba(255,255,255,0.045);
  --border: rgba(255,255,255,0.09);
  --text-1: #F0F0FF;
  --text-2: rgba(240,240,255,0.80);
  --text-3: rgba(240,240,255,0.62);
  --radius: 16px;
  --nav-h: 64px;
}

html, body {
  background: var(--bg);
  color: var(--text-1);
  font-family: 'Heebo', sans-serif;
  min-height: 100vh;
}

/* ── Main Layout ── */
.lesson-main {
  max-width: 1200px;
  margin: 0 auto;
  padding: calc(var(--nav-h) + 1.5rem) 1.5rem 4rem;
}

/* ── Breadcrumb ── */
.lesson-breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.82rem;
  color: var(--text-3);
  margin-bottom: 1.25rem;
}
.lesson-breadcrumb a {
  color: var(--text-3);
  text-decoration: none;
  transition: color 0.15s;
}
.lesson-breadcrumb a:hover { color: var(--gold); }

/* ── Progress Bar ── */
.lesson-progress-wrap {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.75rem;
}
.lesson-progress-bar {
  flex: 1;
  height: 6px;
  background: rgba(255,255,255,0.08);
  border-radius: 9999px;
  overflow: hidden;
}
.lesson-progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--gold), var(--gold-light));
  border-radius: 9999px;
  transition: width 0.6s ease;
}
.lesson-progress-label {
  font-size: 0.78rem;
  color: var(--text-3);
  white-space: nowrap;
}

/* ── Layout: sidebar + content ── */
.lesson-layout {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 1.5rem;
  align-items: start;
}

/* ── Sidebar ── */
.lesson-sidebar {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  position: sticky;
  top: calc(var(--nav-h) + 1.5rem);
  max-height: calc(100vh - var(--nav-h) - 3rem);
  overflow-y: auto;
}
.sidebar-title {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--text-3);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 0.75rem;
}
.sidebar-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-height: 360px;
}
.sidebar-list li { border-radius: 8px; }
.sidebar-list li.active { background: rgba(232,160,32,0.1); }
.sidebar-link {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.55rem 0.65rem;
  border-radius: 8px;
  text-decoration: none;
  color: var(--text-2);
  font-size: 0.85rem;
  transition: all 0.15s;
}
.sidebar-link:hover { color: var(--text-1); background: rgba(255,255,255,0.05); }
.sidebar-link.active { color: var(--gold); font-weight: 700; }
.sidebar-num {
  font-size: 0.7rem;
  color: var(--text-3);
  min-width: 1.5rem;
  font-family: 'Space Grotesk', monospace;
}

/* ── Content ── */
.lesson-content-wrap {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem 2.5rem;
  backdrop-filter: blur(20px);
}

.lesson-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 1rem;
}
.lesson-badge {
  display: inline-flex;
  align-items: center;
  padding: 0.25rem 0.75rem;
  border-radius: 9999px;
  font-size: 0.75rem;
  font-weight: 600;
  background: rgba(232,160,32,0.12);
  border: 1px solid rgba(232,160,32,0.25);
  color: var(--gold-light);
}
.lesson-badge-time {
  background: rgba(255,255,255,0.06);
  border-color: rgba(255,255,255,0.1);
  color: var(--text-2);
}
.lesson-badge-cat {
  background: rgba(100,80,200,0.12);
  border-color: rgba(100,80,200,0.25);
  color: #A78BFA;
}

.lesson-title {
  font-size: 2rem;
  font-weight: 900;
  color: var(--text-1);
  margin-bottom: 2rem;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

/* ── Lesson Body (rendered HTML from JSON) ── */
.lesson-body {
  font-size: 1rem;
  line-height: 1.8;
  color: var(--text-2);
  min-height: 600px;
}
.lesson-body h2 {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--text-1);
  margin: 2rem 0 0.75rem;
}
.lesson-body h3 {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--gold-light);
  margin: 1.5rem 0 0.5rem;
}
.lesson-body p { margin-bottom: 1rem; }
.lesson-body ul, .lesson-body ol {
  padding-inline-start: 1.5rem;
  margin-bottom: 1rem;
}
.lesson-body li { margin-bottom: 0.4rem; }
.lesson-body code {
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: 5px;
  padding: 0.15em 0.4em;
  font-size: 0.88em;
  font-family: 'JetBrains Mono', monospace;
  color: #A5F3FC;
}
.lesson-body pre {
  background: rgba(0,0,0,0.35);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 12px;
  padding: 1.25rem 1.5rem;
  overflow-x: auto;
  margin: 1.25rem 0;
}
.lesson-body pre code {
  background: none;
  border: none;
  padding: 0;
  font-size: 0.9rem;
}
.lesson-body blockquote {
  border-inline-start: 3px solid var(--gold);
  padding-inline-start: 1rem;
  margin: 1.25rem 0;
  color: var(--text-3);
  font-style: italic;
}
.lesson-body strong { color: var(--text-1); }
.lesson-body a { color: var(--gold); }

/* ── Complete Button ── */
.lesson-complete-wrap {
  margin-top: 2.5rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border);
  text-align: center;
}
.btn-complete {
  padding: 0.95rem 2.5rem;
  border: none;
  border-radius: 14px;
  font-size: 1rem;
  font-weight: 800;
  font-family: 'Heebo', sans-serif;
  cursor: pointer;
  color: #fff;
  background: linear-gradient(135deg, #5B21B6 0%, var(--gold) 60%, var(--gold-light) 100%);
  background-size: 200% 200%;
  animation: liquidBtn 3s ease-in-out infinite;
  transition: transform 0.2s, box-shadow 0.2s, opacity 0.2s;
  box-shadow: 0 8px 32px rgba(232,160,32,0.35);
}
@keyframes liquidBtn {
  0%,100% { background-position: 0% 50%; }
  50%      { background-position: 100% 50%; }
}
.btn-complete:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 40px rgba(232,160,32,0.5);
}
.btn-complete.done {
  background: linear-gradient(135deg, #10B981, #059669);
  animation: none;
  opacity: 0.85;
  cursor: default;
}
.complete-hint {
  margin-top: 0.75rem;
  font-size: 0.85rem;
  color: var(--text-3);
}

/* ── Prev / Next Nav ── */
.lesson-nav-btns {
  display: flex;
  justify-content: space-between;
  margin-top: 2rem;
  gap: 1rem;
}
.lesson-nav-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.7rem 1.25rem;
  border-radius: 12px;
  font-size: 0.9rem;
  font-weight: 700;
  text-decoration: none;
  color: var(--text-2);
  background: var(--bg-card);
  border: 1px solid var(--border);
  transition: all 0.2s;
}
.lesson-nav-btn:hover {
  color: var(--gold);
  border-color: rgba(232,160,32,0.4);
  background: rgba(232,160,32,0.08);
}
.lesson-nav-btn-next { margin-inline-start: auto; }

/* ── Mobile ── */
@media (max-width: 768px) {
  .lesson-layout {
    grid-template-columns: 1fr;
  }
  .lesson-sidebar {
    position: static;
    max-height: 200px;
  }
  .sidebar-list {
    min-height: unset; /* kill forced 360px — causes internal scroll on mobile */
  }
  .lesson-content-wrap {
    padding: 1.25rem;
  }
  .lesson-title { font-size: 1.65rem; }
}

@media (max-width: 480px) {
  .lesson-sidebar {
    max-height: 140px; /* tighter on small phones */
  }
}

/* ── Copy button on <pre> code blocks ── */
.code-block-wrap {
  position: relative;
  margin: 1rem 0;
}
.code-block-wrap > pre {
  margin: 0;
  padding-top: 2.5rem;
}
.copy-btn {
  position: absolute;
  top: 0.5rem;
  inset-inline-end: 0.5rem;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  background: rgba(232, 160, 32, 0.12);
  color: #fcd34d;
  border: 1px solid rgba(232, 160, 32, 0.35);
  border-radius: 8px;
  padding: 0.35rem 0.7rem;
  font: 600 12px/1 'Heebo', system-ui, sans-serif;
  cursor: pointer;
  transition: background 0.15s ease, transform 0.1s ease;
  z-index: 2;
}
.copy-btn:hover {
  background: rgba(232, 160, 32, 0.22);
}
.copy-btn:active {
  transform: scale(0.96);
}
.copy-btn.is-copied {
  background: rgba(16, 185, 129, 0.2);
  color: #6ee7b7;
  border-color: rgba(16, 185, 129, 0.5);
}
.copy-btn svg {
  flex-shrink: 0;
}