/* === TRADING GUIDE DESIGN SYSTEM === */

:root {
  --color-bg: #0B0F14;
  --color-surface: #111920;
  --color-surface-2: #182230;
  --color-surface-3: #1E2A3A;
  --color-border: rgba(255,255,255,0.08);
  --color-border-light: rgba(255,255,255,0.12);
  --color-text: #E2E8F0;
  --color-text-muted: #8B9BB4;
  --color-text-faint: #556275;
  --color-primary: #00D4AA;
  --color-primary-dim: rgba(0,212,170,0.12);
  --color-primary-hover: #00B894;
  --color-bullish: #22C55E;
  --color-bearish: #EF4444;
  --color-warning: #F59E0B;
  --color-info: #3B82F6;

  --font-display: 'Space Grotesk', system-ui, sans-serif;
  --font-body: 'Inter', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;

  /* Typography scale */
  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 1.875rem;
  --text-hero: clamp(2rem, 5vw, 3.5rem);

  /* Border radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-full: 9999px;

  /* Content widths */
  --content-width: 900px;
  --content-wide: 1200px;
}

body {
  font-family: var(--font-body);
  font-size: var(--text-base);
  color: var(--color-text);
  background: var(--color-bg);
  overflow-x: hidden;
}

/* === HEADER / NAV === */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(11,15,20,0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--color-border);
  transition: box-shadow 0.3s ease;
}
.site-header.scrolled { box-shadow: 0 4px 24px rgba(0,0,0,0.3); }

.header-inner {
  max-width: var(--content-wide);
  margin: 0 auto;
  padding: var(--space-3) var(--space-4);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--text-lg);
  color: var(--color-text);
  white-space: nowrap;
}
.logo svg { flex-shrink: 0; }
.logo-accent { color: var(--color-primary); }

.nav-desktop {
  display: flex;
  gap: var(--space-1);
  align-items: center;
}
.nav-desktop a {
  padding: var(--space-1) var(--space-2);
  font-size: 0.8rem;
  color: var(--color-text-muted);
  border-radius: var(--radius-md);
  transition: color 0.2s, background 0.2s;
  white-space: nowrap;
  text-decoration: none;
}
.nav-desktop a:hover,
.nav-desktop a.active {
  color: var(--color-primary);
  background: var(--color-primary-dim);
}

.nav-mobile-btn {
  display: none;
  width: 40px; height: 40px;
  align-items: center; justify-content: center;
  color: var(--color-text-muted);
}

.nav-mobile {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 200;
  background: rgba(11,15,20,0.97);
  backdrop-filter: blur(20px);
  padding: var(--space-16) var(--space-6);
  flex-direction: column;
  gap: var(--space-2);
  overflow-y: auto;
}
.nav-mobile.open { display: flex; }
.nav-mobile a {
  padding: var(--space-3) var(--space-4);
  font-size: var(--text-lg);
  color: var(--color-text-muted);
  border-radius: var(--radius-md);
  transition: color 0.2s, background 0.2s;
}
.nav-mobile a:hover { color: var(--color-primary); background: var(--color-primary-dim); }
.nav-mobile-close {
  position: absolute;
  top: var(--space-4);
  right: var(--space-4);
  width: 44px; height: 44px;
  display: flex; align-items: center; justify-content: center;
  color: var(--color-text-muted);
  font-size: 24px;
}

@media (max-width: 1100px) {
  .nav-desktop { display: none; }
  .nav-mobile-btn { display: flex; }
}

/* === HERO === */
.hero {
  min-height: 80vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: var(--space-24) var(--space-4);
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute;
  top: -40%;
  left: 50%;
  transform: translateX(-50%);
  width: 800px;
  height: 800px;
  background: radial-gradient(circle, rgba(0,212,170,0.08) 0%, transparent 70%);
  pointer-events: none;
}
.hero-content {
  position: relative;
  max-width: 720px;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-1) var(--space-3);
  background: var(--color-primary-dim);
  border: 1px solid rgba(0,212,170,0.2);
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  color: var(--color-primary);
  font-weight: 500;
  margin-bottom: var(--space-6);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.hero h1 {
  font-family: var(--font-display);
  font-size: var(--text-hero);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-6);
}
.hero h1 .gradient-text {
  background: linear-gradient(135deg, var(--color-primary), #00E5C7, #4FFFDF);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-sub {
  font-size: var(--text-lg);
  color: var(--color-text-muted);
  line-height: 1.6;
  max-width: 560px;
  margin: 0 auto var(--space-8);
}
.hero-motto {
  font-family: var(--font-display);
  font-size: var(--text-sm);
  color: var(--color-primary);
  font-weight: 500;
  letter-spacing: 0.06em;
  opacity: 0.8;
  margin-bottom: var(--space-8);
}
.hero-cta {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  background: var(--color-primary);
  color: var(--color-bg);
  font-weight: 600;
  font-size: var(--text-sm);
  border-radius: var(--radius-full);
  transition: background 0.2s, transform 0.2s;
}
.hero-cta:hover { background: var(--color-primary-hover); transform: translateY(-1px); }
.hero-cta svg { width: 16px; height: 16px; }

/* === LEVEL SECTIONS === */
.level-section {
  padding: clamp(var(--space-16), 6vw, var(--space-24)) var(--space-4);
  border-top: 1px solid var(--color-border);
}
.level-section:nth-child(even) { background: rgba(17,25,32,0.5); }

.section-container {
  max-width: var(--content-wide);
  margin: 0 auto;
}

.level-header {
  margin-bottom: var(--space-12);
}
.level-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: var(--space-4);
}
.level-badge.beginner { background: rgba(34,197,94,0.12); color: #22C55E; }
.level-badge.intermediate { background: rgba(59,130,246,0.12); color: #3B82F6; }
.level-badge.advanced { background: rgba(168,85,247,0.12); color: #A855F7; }
.level-badge.critical { background: rgba(245,158,11,0.12); color: #F59E0B; }

.level-header h2 {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-3);
}
.level-desc {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  max-width: 65ch;
  line-height: 1.7;
}

/* === TOPIC CARDS === */
.topics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(340px, 100%), 1fr));
  gap: var(--space-6);
}

.topic-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  transition: border-color 0.2s, box-shadow 0.2s;
  cursor: pointer;
}
.topic-card:hover {
  border-color: rgba(0,212,170,0.3);
  box-shadow: 0 4px 24px rgba(0,212,170,0.06);
}
.topic-card.expanded {
  grid-column: 1 / -1;
  cursor: default;
  padding: var(--space-8);
}

.topic-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-3);
  margin-bottom: var(--space-3);
}
.topic-num {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-primary);
  font-weight: 500;
}
.topic-title {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 600;
  margin-bottom: var(--space-2);
}
.topic-summary {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.6;
}
.topic-card.expanded .topic-summary {
  max-width: var(--content-width);
}
.topic-expand-icon {
  width: 20px;
  height: 20px;
  color: var(--color-text-faint);
  flex-shrink: 0;
  transition: transform 0.3s ease;
}
.topic-card.expanded .topic-expand-icon { transform: rotate(180deg); }

/* === TOPIC CONTENT (expanded) === */
.topic-content {
  display: none;
  margin-top: var(--space-6);
  padding-top: var(--space-6);
  border-top: 1px solid var(--color-border);
  max-width: var(--content-width);
  margin-left: auto;
  margin-right: auto;
}
.topic-card.expanded .topic-content { display: block; }

.content-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
}
@media (min-width: 768px) {
  .content-grid.two-col { grid-template-columns: 1fr 1fr; }
  .content-grid.three-col { grid-template-columns: repeat(3, 1fr); }
}

.content-block h3 {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 600;
  margin-bottom: var(--space-4);
  margin-top: var(--space-8);
  color: var(--color-text);
}
.content-block:first-child h3:first-child {
  margin-top: 0;
}
.content-block h4 {
  font-size: var(--text-sm);
  font-weight: 600;
  margin-bottom: var(--space-2);
  color: var(--color-text);
}
.content-block p {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.7;
  margin-bottom: var(--space-4);
  max-width: 75ch;
}
.content-block ul {
  margin-bottom: var(--space-4);
}
.content-block li {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.6;
  padding-left: var(--space-4);
  position: relative;
  margin-bottom: var(--space-2);
}
.content-block li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 9px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-primary);
  opacity: 0.6;
}
.content-block ul {
  max-width: 75ch;
}

/* === PATTERN / CONCEPT CARDS === */
.pattern-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(200px, 100%), 1fr));
  gap: var(--space-3);
}
.pattern-card {
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
}
.pattern-card h4 {
  font-family: var(--font-display);
  font-size: var(--text-sm);
  font-weight: 600;
  margin-bottom: var(--space-2);
}
.pattern-card .signal {
  display: inline-block;
  padding: 2px var(--space-2);
  border-radius: var(--radius-full);
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: var(--space-2);
}
.signal.bullish { background: rgba(34,197,94,0.15); color: var(--color-bullish); }
.signal.bearish { background: rgba(239,68,68,0.15); color: var(--color-bearish); }
.signal.neutral { background: rgba(139,155,180,0.15); color: var(--color-text-muted); }
.signal.reversal { background: rgba(168,85,247,0.15); color: #A855F7; }
.signal.continuation { background: rgba(59,130,246,0.15); color: var(--color-info); }

.pattern-card p {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  line-height: 1.5;
}

/* === CANDLE DIAGRAMS (SVG) === */
.candle-diagram {
  display: flex;
  align-items: flex-end;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-4);
  background: var(--color-surface-3);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-3);
  min-height: 80px;
}

/* === KEY CONCEPT BOX === */
.key-concept {
  background: var(--color-primary-dim);
  border: 1px solid rgba(0,212,170,0.2);
  border-radius: var(--radius-xl);
  padding: var(--space-6) var(--space-8);
  margin: var(--space-6) 0;
}
.key-concept h4 {
  font-family: var(--font-display);
  font-size: var(--text-base);
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: var(--space-3);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}
.key-concept p {
  font-size: var(--text-sm);
  color: var(--color-text);
  line-height: 1.7;
  max-width: 70ch;
}

/* === WARNING BOX === */
.warning-box {
  background: rgba(245,158,11,0.08);
  border: 1px solid rgba(245,158,11,0.2);
  border-radius: var(--radius-xl);
  padding: var(--space-6) var(--space-8);
  margin: var(--space-6) 0;
}
.warning-box h4 {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-warning);
  margin-bottom: var(--space-2);
}
.warning-box p {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.6;
}

/* === TABLE === */
.data-table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: var(--space-4);
  font-size: var(--text-sm);
}
.data-table th {
  text-align: left;
  padding: var(--space-3) var(--space-4);
  background: var(--color-surface-2);
  color: var(--color-text-muted);
  font-weight: 600;
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  border-bottom: 1px solid var(--color-border-light);
}
.data-table td {
  padding: var(--space-3) var(--space-4);
  border-bottom: 1px solid var(--color-border);
  color: var(--color-text-muted);
}
.data-table tr:hover td { background: rgba(255,255,255,0.02); }
.data-table .mono { font-family: var(--font-mono); font-size: var(--text-xs); }

/* === FORMULA BOX === */
.formula {
  display: inline-block;
  background: var(--color-surface-3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-2) var(--space-4);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-primary);
  margin: var(--space-2) 0;
}

/* === PROGRESS ROADMAP === */
.roadmap {
  display: flex;
  gap: var(--space-3);
  overflow-x: auto;
  padding: var(--space-2) var(--space-4) var(--space-4);
  -webkit-overflow-scrolling: touch;
  justify-content: center;
}
.roadmap-step {
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
  min-width: 100px;
  text-align: center;
}
.roadmap-dot {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 700;
  position: relative;
}
.roadmap-step:not(:last-child) .roadmap-dot::after {
  content: '';
  position: absolute;
  left: 100%;
  top: 50%;
  width: calc(var(--space-3) + 70px);
  height: 2px;
  background: var(--color-border-light);
}
.roadmap-dot.green { background: rgba(34,197,94,0.15); color: var(--color-bullish); }
.roadmap-dot.blue { background: rgba(59,130,246,0.15); color: var(--color-info); }
.roadmap-dot.purple { background: rgba(168,85,247,0.15); color: #A855F7; }
.roadmap-dot.yellow { background: rgba(245,158,11,0.15); color: var(--color-warning); }
.roadmap-dot.red { background: rgba(239,68,68,0.15); color: #EF4444; }
.roadmap-dot.gold { background: rgba(245,158,11,0.15); color: #F5A623; }
.roadmap-label {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  max-width: 140px;
  text-align: center;
  word-wrap: break-word;
  overflow-wrap: break-word;
  line-height: 1.3;
}

/* === PROGRESS BAR === */
.progress-bar-section {
  padding: var(--space-6) var(--space-4) 0;
}
.progress-bar-container {
  max-width: var(--content-wide);
  margin: 0 auto;
}
.progress-bar-wrapper {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: var(--space-4) var(--space-6);
  border: 1px solid var(--color-border);
}
.progress-bar-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-3);
}
.progress-bar-label {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}
.progress-bar-pct {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-primary);
}
.progress-bar-track {
  width: 100%;
  height: 8px;
  background: var(--color-surface-2);
  border-radius: var(--radius-full);
  overflow: hidden;
}
.progress-bar-fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--color-primary), var(--color-primary-hover));
  border-radius: var(--radius-full);
  transition: width 0.6s ease;
}

/* === STATS PANEL === */
.stats-panel {
  padding: var(--space-6) var(--space-4);
}
.stats-grid {
  max-width: var(--content-wide);
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-4);
}
.stat-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6) var(--space-4);
  text-align: center;
}
.stat-value {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-2);
}
.stat-highlight {
  color: var(--color-primary);
}
.stat-label {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

@media (max-width: 600px) {
  .stats-grid {
    grid-template-columns: 1fr;
  }
}

/* === FOOTER === */
.site-footer {
  padding: var(--space-12) var(--space-4);
  border-top: 1px solid var(--color-border);
  text-align: center;
}
.footer-inner {
  max-width: var(--content-wide);
  margin: 0 auto;
}
.footer-motto {
  font-family: var(--font-display);
  font-size: var(--text-sm);
  color: var(--color-primary);
  font-weight: 500;
  letter-spacing: 0.04em;
  margin-bottom: var(--space-4);
}
.footer-links {
  display: flex;
  justify-content: center;
  gap: var(--space-6);
  margin-bottom: var(--space-4);
  flex-wrap: wrap;
}
.footer-links a {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  transition: color 0.2s;
}
.footer-links a:hover { color: var(--color-primary); }
.footer-credit {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
}
.footer-credit a { color: var(--color-text-muted); transition: color 0.2s; }
.footer-credit a:hover { color: var(--color-primary); }

/* === MARK COMPLETE === */
.mark-complete-section {
  margin: var(--space-6) 0;
  padding-top: var(--space-4);
  border-top: 1px solid var(--color-border);
}
.mark-complete-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-5);
  background: var(--color-primary-dim);
  color: var(--color-primary);
  border: 1px solid rgba(0,212,170,0.25);
  border-radius: var(--radius-full);
  font-size: var(--text-sm);
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s, border-color 0.2s;
}
.mark-complete-btn:hover {
  background: rgba(0,212,170,0.2);
  border-color: rgba(0,212,170,0.4);
}
.mark-complete-btn.completed {
  background: var(--color-primary);
  color: var(--color-bg);
}

/* === QUIZ SECTION === */
.quiz-section {
  margin-top: var(--space-6);
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  overflow: hidden;
}
.quiz-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4) var(--space-5);
  cursor: pointer;
  user-select: none;
  transition: background 0.2s;
}
.quiz-header:hover {
  background: rgba(255,255,255,0.03);
}
.quiz-header-left {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}
.quiz-header-icon {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(59,130,246,0.15);
  color: var(--color-info);
  border-radius: 50%;
  font-weight: 700;
  font-size: var(--text-sm);
}
.quiz-title {
  font-family: var(--font-display);
  font-size: var(--text-base);
  font-weight: 600;
  color: var(--color-text);
}
.quiz-toggle-icon {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  color: var(--color-text-faint);
  transition: transform 0.3s ease;
}
.quiz-section.quiz-open .quiz-toggle-icon {
  transform: rotate(180deg);
}
.quiz-body {
  display: none;
  padding: 0 var(--space-5) var(--space-5);
}
.quiz-section.quiz-open .quiz-body {
  display: block;
}
.quiz-question {
  margin-bottom: var(--space-5);
}
.quiz-q-num {
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--color-text-faint);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-2);
}
.quiz-q-text {
  font-size: var(--text-base);
  font-weight: 500;
  color: var(--color-text);
  margin-bottom: var(--space-4);
  line-height: 1.5;
}
.quiz-options {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}
.quiz-option {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  cursor: pointer;
  font-size: var(--text-sm);
  color: var(--color-text);
  transition: border-color 0.2s, background 0.2s;
  text-align: left;
  width: 100%;
}
.quiz-option:hover {
  border-color: rgba(0,212,170,0.3);
  background: rgba(0,212,170,0.05);
}
.quiz-option.selected {
  border-color: var(--color-info);
  background: rgba(59,130,246,0.1);
}
.quiz-option.correct {
  border-color: var(--color-bullish);
  background: rgba(34,197,94,0.1);
}
.quiz-option.wrong {
  border-color: var(--color-bearish);
  background: rgba(239,68,68,0.1);
}
.option-letter {
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: var(--color-surface-2);
  color: var(--color-text-muted);
  font-size: var(--text-xs);
  font-weight: 600;
  flex-shrink: 0;
  text-transform: uppercase;
}
.quiz-option.correct .option-letter {
  background: var(--color-bullish);
  color: #fff;
}
.quiz-option.wrong .option-letter {
  background: var(--color-bearish);
  color: #fff;
}
.quiz-explanation {
  margin-top: var(--space-3);
  padding: var(--space-3) var(--space-4);
  background: rgba(59,130,246,0.08);
  border-left: 3px solid var(--color-info);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.5;
}
.quiz-score {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-4) var(--space-5);
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  margin-top: var(--space-4);
}
.quiz-score-icon {
  font-size: 1.5rem;
}
.quiz-score-text {
  font-size: var(--text-sm);
  color: var(--color-text);
  font-weight: 500;
}
.quiz-section.quiz-passed .quiz-header {
  border-left: 3px solid var(--color-bullish);
}

/* === SCROLL ANIMATIONS === */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s cubic-bezier(0.16, 1, 0.3, 1), transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* === SCROLLBAR === */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: var(--color-bg); }
::-webkit-scrollbar-thumb { background: var(--color-surface-3); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--color-text-faint); }

/* === BACK TO TOP === */
.back-to-top {
  position: fixed;
  bottom: var(--space-6);
  right: var(--space-6);
  width: 44px;
  height: 44px;
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-muted);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s, background 0.2s;
  z-index: 50;
}
.back-to-top.visible { opacity: 1; pointer-events: auto; }
.back-to-top:hover { background: var(--color-primary-dim); color: var(--color-primary); }

/* === RESPONSIVE OVERRIDES === */
@media (max-width: 640px) {
  .hero { min-height: 70vh; padding: var(--space-16) var(--space-4); }
  .topics-grid { grid-template-columns: 1fr; }
  .pattern-grid { grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); }
  .data-table { font-size: var(--text-xs); }
  .data-table th, .data-table td { padding: var(--space-2) var(--space-3); }
  .topic-card.expanded { padding: var(--space-4); }
  .key-concept { padding: var(--space-4) var(--space-5); }
  .warning-box { padding: var(--space-4) var(--space-5); }
  .content-block h3 { font-size: var(--text-lg); margin-top: var(--space-6); }
}

/* Greek card styling */
.greek-card {
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
}
.greek-symbol {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 700;
  margin-bottom: var(--space-2);
}
.greek-card h4 {
  font-family: var(--font-display);
  font-size: var(--text-base);
  font-weight: 600;
  margin-bottom: var(--space-2);
}
.greek-card p {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.6;
}

/* Options strategy cards */
.strategy-card {
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
}
.strategy-card h4 {
  font-family: var(--font-display);
  font-size: var(--text-base);
  font-weight: 600;
  margin-bottom: var(--space-1);
}
.strategy-card .risk-tag {
  display: inline-block;
  padding: 2px var(--space-2);
  border-radius: var(--radius-full);
  font-size: 11px;
  font-weight: 600;
  margin-bottom: var(--space-3);
}
.risk-tag.low { background: rgba(34,197,94,0.15); color: var(--color-bullish); }
.risk-tag.moderate { background: rgba(245,158,11,0.15); color: var(--color-warning); }
.risk-tag.high { background: rgba(239,68,68,0.15); color: var(--color-bearish); }
.strategy-card p {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.6;
}

/* Checklist items */
.checklist-item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  padding: var(--space-3) 0;
  border-bottom: 1px solid var(--color-border);
}
.checklist-item:last-child { border-bottom: none; }
.checklist-icon {
  width: 20px; height: 20px;
  flex-shrink: 0;
  color: var(--color-primary);
  margin-top: 2px;
}
.checklist-text {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.6;
}
.checklist-text strong { color: var(--color-text); }

/* Overflow container for tables on mobile */
.table-wrap {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  margin-bottom: var(--space-4);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
}
.table-wrap .data-table { margin-bottom: 0; }
.table-wrap .data-table th:first-child,
.table-wrap .data-table td:first-child { white-space: nowrap; }

/* ============================================================ */
/* MURPHY BOOK FIGURES                                           */
/* ============================================================ */
.murphy-figure {
  margin: var(--space-6) 0;
  text-align: center;
  background: rgba(255,255,255,0.03);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
  overflow: hidden;
}
.murphy-figure img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-md);
  filter: invert(0.88) hue-rotate(180deg);
}
.murphy-figure figcaption {
  margin-top: var(--space-3);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  font-style: italic;
}
@media (min-width: 768px) {
  .murphy-figure img {
    max-width: 80%;
  }
}

/* Wyckoff SVG diagrams */
.wyckoff-diagram {
  margin: var(--space-6) 0;
  text-align: center;
  padding: var(--space-4) 0;
}
.wyckoff-diagram svg {
  max-width: 100%;
  height: auto;
}

/* External visual aid images - color images, no inversion */
.visual-aid-figure {
  margin: var(--space-6) 0;
  padding: 0;
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid rgba(255,255,255,0.06);
  background: rgba(255,255,255,0.02);
}
.visual-aid-figure img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 12px 12px 0 0;
}
.visual-aid-figure figcaption {
  padding: 0.75rem 1rem;
  font-size: 0.8rem;
  color: rgba(255,255,255,0.5);
  line-height: 1.4;
  border-top: 1px solid rgba(255,255,255,0.06);
}
.visual-aid-figure figcaption .img-source {
  color: var(--color-accent);
  font-size: 0.7rem;
  margin-left: 0.5rem;
}
@media (min-width: 768px) {
  .visual-aid-figure img {
    max-width: 90%;
    margin: 0 auto;
  }
  .visual-aid-figure {
    max-width: 700px;
  }
}

/* ============================================================
   LANGUAGE TOGGLE
   ============================================================ */
.lang-toggle {
  display: flex;
  align-items: center;
  gap: 2px;
  background: rgba(255, 255, 255, 0.06);
  border-radius: 6px;
  padding: 2px;
  margin-left: 12px;
  flex-shrink: 0;
}

.lang-btn {
  padding: 4px 10px;
  border: none;
  background: transparent;
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  cursor: pointer;
  border-radius: 4px;
  transition: all 0.2s ease;
  line-height: 1;
}

.lang-btn:hover {
  color: var(--color-text);
}

.lang-btn.active {
  background: var(--color-primary);
  color: var(--color-bg);
}

/* Mobile nav toggle */
.mobile-lang-toggle {
  margin: 16px 24px 8px;
  justify-content: center;
}

.mobile-lang-toggle .lang-btn {
  padding: 8px 20px;
  font-size: 0.85rem;
}

/* Ensure nav doesn't overflow with toggle */
.nav-desktop {
  flex-wrap: nowrap;
}

@media (max-width: 1100px) {
  .lang-toggle:not(.mobile-lang-toggle):not(.floating-lang-toggle) {
    display: none;
  }
}

/* Floating Language Toggle — Always Visible */
.floating-lang-toggle {
  position: fixed;
  top: 72px;
  right: 16px;
  z-index: 999;
  display: flex;
  align-items: center;
  gap: 2px;
  background: rgba(15, 17, 23, 0.95);
  backdrop-filter: blur(12px);
  border: 1px solid rgba(100, 116, 139, 0.25);
  border-radius: 8px;
  padding: 4px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
  transition: opacity 0.3s ease;
}
.floating-lang-toggle .lang-btn {
  padding: 6px 14px;
  border: none;
  background: transparent;
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  cursor: pointer;
  border-radius: 6px;
  transition: all 0.2s ease;
  line-height: 1;
}
.floating-lang-toggle .lang-btn:hover {
  color: var(--color-text);
}
.floating-lang-toggle .lang-btn.active {
  background: var(--color-primary);
  color: var(--color-bg);
}
.floating-lang-toggle .globe-icon {
  display: flex;
  align-items: center;
  padding: 0 6px 0 8px;
  color: var(--color-text-faint);
}
/* Hide floating toggle when non-Study tabs are active */
.command-center-active .floating-lang-toggle,
.scanner-active .floating-lang-toggle,
.journal-active .floating-lang-toggle,
.hub-active .floating-lang-toggle,
.library-active .floating-lang-toggle {
  display: none;
}

/* ── Spanish Image Explanation Boxes ── */
.es-image-note {
  display: none;
  margin: calc(var(--space-3) * -1) 0 var(--space-4) 0;
  padding: var(--space-3) var(--space-4);
  background: rgba(0, 212, 170, 0.06);
  border-left: 3px solid var(--color-accent, #00D4AA);
  border-radius: 0 var(--radius-md, 8px) var(--radius-md, 8px) 0;
  font-size: var(--text-sm, 0.875rem);
  color: var(--color-text-secondary, #8B95A5);
  line-height: 1.6;
}
.es-image-note-inner strong {
  color: var(--color-accent, #00D4AA);
}
[lang="es"] .es-image-note,
html[lang="es"] .es-image-note {
  display: block;
}

/* Credits & Disclaimer */
.credits-disclaimer-section {
  max-width: var(--content-width, 900px);
  margin: var(--space-12) auto;
  padding: 0 var(--space-6);
}
.credits-section, .disclaimer-section {
  margin-bottom: var(--space-8);
}
.credits-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-6);
  margin-top: var(--space-4);
}
.credit-group {
  background: var(--color-surface-alt, rgba(255,255,255,0.03));
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg, 12px);
  padding: var(--space-4);
}
.credit-group h4 {
  color: var(--color-accent);
  font-size: var(--text-sm);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-3);
  padding-bottom: var(--space-2);
  border-bottom: 1px solid var(--color-border);
}
.credit-group ul { list-style: none; padding: 0; margin: 0; }
.credit-group li {
  padding: var(--space-1) 0;
  font-size: var(--text-sm);
  color: var(--color-text-secondary, var(--color-text-muted));
  line-height: 1.5;
}
.disclaimer-box {
  background: rgba(255, 87, 87, 0.05);
  border: 1px solid rgba(255, 87, 87, 0.2);
  border-radius: var(--radius-lg, 12px);
  padding: var(--space-6);
  margin-top: var(--space-4);
}
.disclaimer-box p { margin-bottom: var(--space-3); }
.disclaimer-box ul { margin: var(--space-3) 0; padding-left: var(--space-6); }
.disclaimer-box li {
  margin-bottom: var(--space-2);
  font-size: var(--text-sm);
  line-height: 1.6;
  color: var(--color-text-secondary, var(--color-text-muted));
}