/* ═══════════════════════════════════════════════════════
   TEMA CUSTOM — TÓPICOS ESPECIAIS IA
   Dark glassmorphism + gradients + clean typography
   ═══════════════════════════════════════════════════════ */

:root {
  --bg-primary: #0a0a1a;
  --bg-card: rgba(255, 255, 255, 0.03);
  --bg-card-hover: rgba(255, 255, 255, 0.06);
  --border-subtle: rgba(255, 255, 255, 0.08);
  --text-primary: #f0f0f5;
  --text-secondary: rgba(240, 240, 245, 0.7);
  --text-muted: rgba(240, 240, 245, 0.45);
  --cyan: #22d3ee;
  --purple: #a78bfa;
  --green: #4ade80;
  --amber: #fbbf24;
  --red: #f87171;
  --pink: #f472b6;
  --blue: #60a5fa;
  --font-sans: "Segoe UI", Aptos, Calibri, -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: Consolas, "Courier New", Courier, monospace;
  --radius: 14px;
  --radius-sm: 8px;
}

/* ─── Base Overrides ─── */
.reveal {
  font-family: var(--font-sans);
  font-size: 28px;
  color: var(--text-primary);
}

.reveal .slides {
  text-align: left;
}

.reveal h1, .reveal h2, .reveal h3 {
  font-weight: 800;
  letter-spacing: -0.02em;
  text-transform: none;
  color: var(--text-primary);
}

.reveal h1 { font-size: 2.4em; }
.reveal h2 { font-size: 1.6em; margin-bottom: 0.6em; }
.reveal h3 { font-size: 1.1em; }

.reveal p, .reveal li {
  line-height: 1.6;
  color: var(--text-secondary);
}

.reveal code {
  font-family: var(--font-mono);
  font-size: 0.85em;
  background: rgba(255, 255, 255, 0.06);
  padding: 0.15em 0.4em;
  border-radius: 4px;
}

.reveal pre {
  font-family: var(--font-mono);
  font-size: 0.55em;
  border-radius: var(--radius);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.4);
}

/* ─── Glow Title ─── */
.glow-text {
  background: linear-gradient(135deg, var(--cyan), var(--purple));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  text-align: center;
  animation: glow-pulse 3s ease-in-out infinite;
}

@keyframes glow-pulse {
  0%, 100% { filter: drop-shadow(0 0 8px rgba(34, 211, 238, 0.3)); }
  50% { filter: drop-shadow(0 0 20px rgba(167, 139, 250, 0.5)); }
}

.subtitle-animate {
  text-align: center;
  color: var(--text-secondary);
  font-size: 1.2em;
  opacity: 0;
  animation: fadeSlideUp 0.8s ease forwards 0.5s;
}

/* ─── Badges ─── */
.meta-info {
  display: flex;
  justify-content: center;
  gap: 0.8rem;
  margin-top: 2rem;
}

.badge {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--border-subtle);
  border-radius: 999px;
  padding: 0.4em 1em;
  font-size: 0.5em;
  color: var(--text-secondary);
  backdrop-filter: blur(10px);
}

/* ─── Cards ─── */
.stagger-in {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.8rem;
  margin-top: 1rem;
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius);
  padding: 1.2rem;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

/* Cards inside a .stagger-in are VISIBLE at rest so pedagogical content never
   stays hidden if the GSAP/CSS entrance animation fails to run. The entrance
   animation (animations.js staggerCards / .present keyframes) still plays on
   slide enter, but the resting state is always visible. */
.stagger-in > * {
  opacity: 1;
  transform: none;
}

.card:hover {
  background: var(--bg-card-hover);
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.3);
}

.card-icon { font-size: 1.5em; margin-bottom: 0.3rem; }
.card-title { font-weight: 700; font-size: 0.7em; margin-bottom: 0.2rem; }
.card-desc { font-size: 0.5em; color: var(--text-secondary); }

.card-cyan { border-color: rgba(34, 211, 238, 0.3); }
.card-purple { border-color: rgba(167, 139, 250, 0.3); }
.card-green { border-color: rgba(74, 222, 128, 0.3); }
.card-amber { border-color: rgba(251, 191, 36, 0.3); }
.card-red { border-color: rgba(248, 113, 113, 0.3); }

/* ═══════════════════════════════════════════════════════
   EXPANDABLE CARDS — Universal click-to-expand system
   Any .card with .expandable class gets click-to-expand behavior.
   ═══════════════════════════════════════════════════════ */
.card.expandable {
  cursor: pointer;
  position: relative;
  overflow: hidden;
}

.card.expandable::after {
  content: '▾ clique para detalhes';
  display: block;
  margin-top: 0.5rem;
  font-size: 0.55rem;
  color: var(--text-muted);
  opacity: 0.6;
  transition: all 0.3s ease;
}

.card.expandable.expanded::after {
  content: '▴ recolher';
  color: var(--cyan);
}

.card.expandable:hover::after {
  opacity: 1;
  color: var(--cyan);
}

.card-detail {
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  transition: max-height 0.5s cubic-bezier(0.16, 1, 0.3, 1),
              opacity 0.3s ease 0.1s,
              margin-top 0.3s ease;
  margin-top: 0;
  font-size: 0.72rem;
  color: var(--text-secondary);
  line-height: 1.55;
  border-top: 1px solid transparent;
}

.card.expandable.expanded .card-detail {
  max-height: 280px;
  overflow-y: auto;
  opacity: 1;
  margin-top: 0.8rem;
  padding-top: 0.8rem;
  border-top: 1px solid var(--border-subtle);
}

.card.expandable.expanded .card-detail::-webkit-scrollbar {
  width: 3px;
}

.card.expandable.expanded .card-detail::-webkit-scrollbar-thumb {
  background: rgba(34, 211, 238, 0.3);
  border-radius: 3px;
}

.card-detail ul {
  padding-left: 1.2rem;
  margin: 0.4rem 0;
}

.card-detail li {
  margin-bottom: 0.3rem;
  font-size: 0.92em;
}

.card-detail p {
  margin: 0.35rem 0;
}

.card-detail .detail-analogy {
  background: rgba(34, 211, 238, 0.06);
  border-left: 3px solid var(--cyan);
  padding: 0.5rem 0.8rem;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin-top: 0.5rem;
  font-style: italic;
}

.card-detail .detail-example {
  background: rgba(74, 222, 128, 0.06);
  border-left: 3px solid var(--green);
  padding: 0.5rem 0.8rem;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin-top: 0.5rem;
}

.card-detail .detail-warning {
  background: rgba(251, 191, 36, 0.06);
  border-left: 3px solid var(--amber);
  padding: 0.5rem 0.8rem;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin-top: 0.5rem;
}

.card-detail code {
  background: rgba(255, 255, 255, 0.08);
  padding: 0.15em 0.4em;
  border-radius: 4px;
  font-size: 0.88em;
}

/* Vocab-specific cards (legacy support from encontro-1 vocab slide) */
.vocab-grid {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin-top: 0.8rem;
  max-height: 75vh;
  overflow-y: auto;
}

.vocab-card {
  cursor: pointer;
  border-radius: var(--radius);
  overflow: hidden;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.vocab-card .vocab-front {
  padding: 0.6rem 1rem;
  border-radius: var(--radius);
  border: 1px solid var(--border-subtle);
  background: var(--bg-card);
  transition: all 0.2s;
}

.vocab-card .vocab-hint {
  font-size: 0.7em;
  color: var(--text-muted);
  margin-left: 0.3rem;
}

.vocab-card .vocab-detail {
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  padding: 0 1rem;
  font-size: 0.65rem;
  line-height: 1.5;
  color: var(--text-secondary);
  transition: max-height 0.5s cubic-bezier(0.16, 1, 0.3, 1), 
              opacity 0.3s ease 0.1s, 
              padding 0.3s ease;
  background: rgba(255,255,255,0.02);
  border: 1px solid transparent;
  border-top: none;
  border-radius: 0 0 var(--radius) var(--radius);
}

.vocab-card.expanded .vocab-detail {
  max-height: 600px;
  opacity: 1;
  padding: 0.8rem 1rem;
  border-color: var(--border-subtle);
}

.vocab-card.expanded .vocab-front {
  border-radius: var(--radius) var(--radius) 0 0;
  background: var(--bg-card-hover);
}

.vocab-card .vocab-detail ul {
  padding-left: 1.2rem;
  margin: 0.3rem 0;
}

.vocab-card .vocab-detail li { margin-bottom: 0.2rem; }
.vocab-card .vocab-detail p { margin: 0.3rem 0; }

.vocab-analogy {
  background: rgba(34, 211, 238, 0.06);
  border-left: 3px solid var(--cyan);
  padding: 0.4rem 0.7rem;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin-top: 0.4rem;
}

/* ─── Terminal ─── */
.terminal {
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
  margin: 1rem 0;
}

.terminal-header {
  background: #2d2d2d;
  padding: 0.6rem 1rem;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.terminal-dot {
  width: 10px; height: 10px;
  border-radius: 50%;
}
.terminal-dot.red { background: #ff5f57; }
.terminal-dot.yellow { background: #febc2e; }
.terminal-dot.green { background: #28c840; }
.terminal-title {
  margin-left: 0.5rem;
  font-size: 0.45em;
  color: #999;
  font-family: var(--font-mono);
}

.terminal-body {
  background: #1a1a2e;
  padding: 1rem;
  margin: 0;
  font-size: 0.55em;
}

/* ─── Timeline ─── */
.timeline-track {
  display: flex;
  justify-content: space-between;
  gap: 0.4rem;
  position: relative;
  margin-top: 2rem;
  padding-top: 1.5rem;
}

.timeline-track::before {
  content: '';
  position: absolute;
  top: 0.5rem;
  left: 5%;
  right: 5%;
  height: 3px;
  background: linear-gradient(90deg, #6b7280, #3b82f6, #a855f7, #22c55e);
  border-radius: 2px;
}

.timeline-era {
  flex: 1;
  text-align: center;
  position: relative;
}

.era-dot {
  width: 14px; height: 14px;
  border-radius: 50%;
  background: var(--color);
  box-shadow: 0 0 10px var(--color);
  margin: 0 auto 0.5rem;
  position: absolute;
  top: -1.3rem;
  left: 50%;
  transform: translateX(-50%);
}

.era-label {
  font-weight: 700;
  font-size: 0.55em;
  color: var(--text-primary);
  margin-bottom: 0.3rem;
}

.era-content {
  font-size: 0.48em;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* ─── Stats / Counters ─── */
.big-date {
  text-align: center;
  font-size: 2.5em;
  font-weight: 800;
  background: linear-gradient(135deg, var(--cyan), var(--blue));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  margin: 0.5em 0;
}

.stats-row {
  display: flex;
  justify-content: center;
  gap: 3rem;
  margin: 1rem 0;
}

.stat { text-align: center; }
.stat-number {
  display: block;
  font-size: 1.5em;
  font-weight: 800;
  color: var(--cyan);
}
.stat-label {
  font-size: 0.5em;
  color: var(--text-muted);
}

/* ─── Explanation Box ─── */
.explanation-box {
  background: var(--bg-card);
  border: 1px solid rgba(34, 211, 238, 0.2);
  border-radius: var(--radius);
  padding: 1.2rem;
  margin-top: 1rem;
}

.explanation-box h3 {
  font-size: 0.7em;
  color: var(--cyan);
  margin-bottom: 0.5em;
}

.explanation-box ul {
  font-size: 0.5em;
  list-style: none;
  padding: 0;
}

.explanation-box li {
  padding: 0.3em 0;
  padding-left: 1.2em;
  position: relative;
}

.explanation-box li::before {
  content: '→';
  position: absolute;
  left: 0;
  color: var(--cyan);
}

.highlight-text {
  margin-top: 0.8em;
  font-size: 0.6em;
  font-weight: 700;
  color: var(--cyan);
  text-align: center;
}

/* ─── Insight Box ─── */
.insight-box {
  text-align: center;
  margin-top: 1.5rem;
  padding: 0.8rem 1.2rem;
  background: rgba(34, 211, 238, 0.08);
  border: 1px solid rgba(34, 211, 238, 0.25);
  border-radius: var(--radius-sm);
  font-size: 0.55em;
}

/* ─── Tip Box ─── */
.tip-box {
  background: rgba(74, 222, 128, 0.08);
  border: 1px solid rgba(74, 222, 128, 0.25);
  border-radius: var(--radius-sm);
  padding: 0.8rem 1rem;
  font-size: 0.55em;
  margin-top: 1rem;
}

/* ─── Custom Navigation ─── */
.custom-nav {
  position: fixed;
  bottom: 1.5rem;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  align-items: center;
  gap: 1rem;
  background: rgba(10, 10, 26, 0.85);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border-subtle);
  border-radius: 999px;
  padding: 0.4rem 1rem;
  z-index: 100;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.reveal:hover .custom-nav,
.custom-nav:hover {
  opacity: 1;
}

.custom-nav button {
  background: none;
  border: none;
  color: var(--text-secondary);
  font-size: 1.5rem;
  cursor: pointer;
  padding: 0.2rem 0.5rem;
  border-radius: 50%;
  transition: all 0.2s;
}

.custom-nav button:hover {
  color: var(--cyan);
  background: rgba(34, 211, 238, 0.1);
}

#nav-progress {
  font-size: 0.7rem;
  font-family: var(--font-mono);
  color: var(--text-muted);
  min-width: 4rem;
  text-align: center;
}

/* ─── Version Footer ─── */
.version-footer {
  position: fixed;
  bottom: 0.5rem;
  left: 1rem;
  font-size: 0.55rem;
  font-family: var(--font-mono);
  color: var(--text-muted);
  z-index: 50;
}

/* ─── Grid Utils ─── */
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.grid-3 { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 0.8rem; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0.6rem; }

/* ─── Text Utils ─── */
.text-center { text-align: center; }
.text-sm { font-size: 0.6em; }
.text-xs { font-size: 0.5em; }
.text-cyan { color: var(--cyan); }
.text-purple { color: var(--purple); }
.text-green { color: var(--green); }
.text-amber { color: var(--amber); }
.text-red { color: var(--red); }
.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.opacity-70 { opacity: 0.7; }

/* ─── Comparison columns ─── */
.compare-cols {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-top: 1rem;
}

.compare-col {
  padding: 1.2rem;
  border-radius: var(--radius);
  font-size: 0.55em;
}

.compare-col.good {
  background: rgba(74, 222, 128, 0.06);
  border: 1px solid rgba(74, 222, 128, 0.25);
}

.compare-col.bad {
  background: rgba(248, 113, 113, 0.06);
  border: 1px solid rgba(248, 113, 113, 0.25);
}

.compare-col h3 {
  font-size: 1.1em;
  margin-bottom: 0.5em;
}

/* ─── Code conversation (agent trace) ─── */
.agent-trace {
  background: #1a1a2e;
  border-radius: var(--radius);
  padding: 1rem;
  font-family: var(--font-mono);
  font-size: 0.5em;
  line-height: 1.7;
  overflow: hidden;
}

.trace-user { color: var(--green); }
.trace-thought { color: var(--amber); }
.trace-action { color: var(--blue); }
.trace-obs { color: #9ca3af; }
.trace-result { color: var(--purple); }
.trace-system { color: #6b7280; }

/* ─── PyRunner ─── */
.pyrunner-container {
  background: #1e1e2e;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius);
  padding: 1rem;
  margin: 1rem 0;
}

.pyrunner-container textarea {
  width: 100%;
  min-height: 140px;
  resize: vertical;
  background: #181825;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  color: #f8fafc;
  padding: 0.8rem;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  line-height: 1.5;
  outline: none;
}

.pyrunner-container .run-btn {
  margin-top: 0.5rem;
  border: none;
  border-radius: 999px;
  padding: 0.5rem 1.2rem;
  font-weight: 700;
  font-size: 0.8rem;
  color: white;
  background: linear-gradient(135deg, #8b5cf6, #d946ef);
  cursor: pointer;
  transition: transform 0.15s, opacity 0.15s;
}

.pyrunner-container .run-btn:hover { transform: translateY(-1px); }
.pyrunner-container .run-btn:disabled { opacity: 0.5; cursor: wait; }

.pyrunner-output {
  margin-top: 0.5rem;
  background: #11111b;
  border-radius: var(--radius-sm);
  padding: 0.6rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--green);
  white-space: pre-wrap;
  max-height: 150px;
  overflow-y: auto;
}

.pyrunner-error {
  color: var(--red);
}

/* ─── Diagram flow (animated nodes) ─── */
.flow-diagram {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.3rem;
  flex-wrap: wrap;
  margin: 1rem 0;
}

.flow-node {
  padding: 0.6rem 1rem;
  border-radius: var(--radius-sm);
  font-size: 0.5em;
  font-weight: 600;
  text-align: center;
  min-width: 80px;
  opacity: 1;
}

.flow-arrow {
  font-size: 1.2em;
  color: var(--text-muted);
  opacity: 1;
}

/* ─── Table ─── */
.reveal table {
  font-size: 0.5em;
  width: 100%;
  border-collapse: collapse;
}

.reveal table th {
  background: rgba(255, 255, 255, 0.05);
  padding: 0.6rem;
  text-align: left;
  font-weight: 700;
}

.reveal table td {
  padding: 0.5rem 0.6rem;
  border-top: 1px solid var(--border-subtle);
}

/* ─── Hide default Reveal controls ─── */
.reveal .controls { display: none !important; }
.reveal .progress { height: 2px !important; }

/* ─── Missing utility classes ─── */
.scale-in {
  animation: scaleIn 0.6s ease forwards;
}
@keyframes scaleIn {
  from { transform: scale(0.9); opacity: 0; }
  to { transform: scale(1); opacity: 1; }
}

.slide-in-left {
  animation: slideInLeft 0.6s ease forwards;
}
@keyframes slideInLeft {
  from { transform: translateX(-30px); opacity: 0; }
  to { transform: translateX(0); opacity: 1; }
}

.parallax-card {
  transform: translateZ(0);
  will-change: transform;
  transition: transform 0.3s ease;
}
.parallax-card:hover {
  transform: translateY(-4px) scale(1.01);
}

.animate-float {
  animation: floatAnim 3s ease-in-out infinite;
}
@keyframes floatAnim {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-6px); }
}

.animate-shimmer {
  background-size: 200% 100%;
  animation: shimmer 2s linear infinite;
}
@keyframes shimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

.trace-line {
  border-left: 2px solid var(--border-subtle);
  padding-left: 0.8rem;
  margin-left: 0.5rem;
}

.card-blue { border-color: rgba(96, 165, 250, 0.3); }

.node-cyan { background: rgba(34, 211, 238, 0.15); border: 1px solid rgba(34, 211, 238, 0.4); color: var(--cyan); }
.node-purple { background: rgba(167, 139, 250, 0.15); border: 1px solid rgba(167, 139, 250, 0.4); color: var(--purple); }
.node-green { background: rgba(74, 222, 128, 0.15); border: 1px solid rgba(74, 222, 128, 0.4); color: var(--green); }
.node-amber { background: rgba(251, 191, 36, 0.15); border: 1px solid rgba(251, 191, 36, 0.4); color: var(--amber); }
.node-red { background: rgba(248, 113, 113, 0.15); border: 1px solid rgba(248, 113, 113, 0.4); color: var(--red); }

/* ═══════════════════════════════════════════════════════
   LEFT SIDEBAR NAVIGATION — Drawer style
   Hamburger always visible · Sidebar slides in · Overlay dims background
   ═══════════════════════════════════════════════════════ */
.sidebar-toggle {
  position: fixed;
  top: 0.75rem;
  left: 0.75rem;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  z-index: 300;
  background: rgba(15, 23, 42, 0.85);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: 10px;
  color: rgba(255,255,255,0.7);
  transition: all 0.25s ease;
  padding: 0;
  outline: none;
}

.sidebar-toggle:hover {
  color: var(--cyan);
  border-color: rgba(34, 211, 238, 0.4);
  background: rgba(15, 23, 42, 0.95);
  transform: scale(1.08);
}

.sidebar-toggle svg {
  width: 20px;
  height: 20px;
}

/* Hide hamburger when sidebar is open */
.sidebar-nav.open ~ .sidebar-toggle {
  opacity: 0;
  pointer-events: none;
  transform: translateX(-20px);
}

.sidebar-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(2px);
  z-index: 240;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}

.sidebar-overlay.active {
  opacity: 1;
  pointer-events: all;
}

.sidebar-nav {
  position: fixed;
  top: 0;
  left: 0;
  height: 100vh;
  width: 300px;
  z-index: 260;
  transform: translateX(-100%);
  transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.sidebar-nav.open {
  transform: translateX(0);
}

.sidebar-content {
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  background: #0d1117;
  border-right: 1px solid rgba(255,255,255,0.08);
  box-shadow: 4px 0 30px rgba(0,0,0,0.6);
}

.sidebar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.1rem 1.2rem 0.9rem;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  color: var(--cyan);
  border-bottom: 1px solid rgba(255,255,255,0.08);
  background: rgba(34, 211, 238, 0.03);
}

.sidebar-close {
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.1);
  color: rgba(255,255,255,0.5);
  font-size: 1rem;
  cursor: pointer;
  padding: 0.25rem 0.55rem;
  border-radius: 6px;
  transition: all 0.15s;
  line-height: 1;
}

.sidebar-close:hover {
  color: #fff;
  background: rgba(255,255,255,0.12);
  border-color: rgba(255,255,255,0.2);
}

.sidebar-list {
  list-style: none;
  padding: 0.6rem 0;
  margin: 0;
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
}

.sidebar-list::-webkit-scrollbar { width: 4px; }
.sidebar-list::-webkit-scrollbar-thumb {
  background: rgba(255,255,255,0.12);
  border-radius: 4px;
}

.sidebar-item {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  padding: 0.55rem 1.2rem;
  cursor: pointer;
  transition: all 0.15s ease;
  position: relative;
  font-size: 0.75rem;
  font-weight: 600;
  color: rgba(255,255,255,0.65);
}

.sidebar-item::before {
  content: '';
  position: absolute;
  left: 0;
  top: 4px;
  bottom: 4px;
  width: 3px;
  background: var(--cyan);
  border-radius: 0 3px 3px 0;
  opacity: 0;
  transition: opacity 0.2s;
}

.sidebar-item:hover {
  background: rgba(34, 211, 238, 0.05);
  color: rgba(255,255,255,0.9);
}

.sidebar-item.active {
  background: rgba(34, 211, 238, 0.08);
  color: var(--cyan);
}

.sidebar-item.active::before { opacity: 1; }

.sidebar-icon {
  font-size: 0.95rem;
  min-width: 1.2rem;
  text-align: center;
  flex-shrink: 0;
}

.sidebar-label {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.sidebar-group { list-style: none; }

.sidebar-topics {
  list-style: none;
  padding: 0;
  margin: 0;
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
}

.sidebar-group.expanded .sidebar-topics {
  max-height: 500px;
}

.sidebar-topics li {
  padding: 0.35rem 1.2rem 0.35rem 3rem;
  font-size: 0.68rem;
  color: rgba(255,255,255,0.5);
  cursor: pointer;
  transition: all 0.15s ease;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  position: relative;
}

.sidebar-topics li::before {
  content: '›';
  position: absolute;
  left: 2.3rem;
  color: rgba(255,255,255,0.25);
  transition: color 0.15s;
}

.sidebar-topics li:hover {
  color: var(--cyan);
  background: rgba(34, 211, 238, 0.04);
}

.sidebar-topics li:hover::before,
.sidebar-topics li.active::before {
  color: var(--cyan);
}

.sidebar-topics li.active {
  color: var(--cyan);
  font-weight: 600;
}

.sidebar-divider {
  height: 1px;
  margin: 0.4rem 1rem;
  background: rgba(255,255,255,0.06);
}

.sidebar-progress {
  margin: 0.5rem 1rem 0.3rem;
  height: 3px;
  background: rgba(255, 255, 255, 0.06);
  border-radius: 3px;
  overflow: hidden;
}

.sidebar-progress-bar {
  height: 100%;
  background: linear-gradient(90deg, var(--cyan), var(--purple));
  border-radius: 3px;
  width: 0%;
  transition: width 0.4s ease;
}

.sidebar-counter {
  text-align: center;
  font-size: 0.58rem;
  font-family: var(--font-mono);
  color: rgba(255,255,255,0.4);
  padding: 0.3rem 0 0.8rem;
}