/* style.css — Code Aura Design Tokens + Components */

/* ==========================================
   DESIGN TOKENS
   ========================================== */
:root {
  /* TYPE SCALE */
  --text-xs:   clamp(0.75rem,  0.7rem  + 0.25vw, 0.875rem);
  --text-sm:   clamp(0.875rem, 0.8rem  + 0.35vw, 1rem);
  --text-base: clamp(1rem,     0.9rem  + 0.5vw,  1.125rem);
  --text-lg:   clamp(1.125rem, 0.95rem + 0.85vw, 1.5rem);
  --text-xl:   clamp(1.5rem,   1rem    + 1.5vw,  2.25rem);
  --text-2xl:  clamp(2rem,     1.2rem  + 2.5vw,  3.5rem);
  --text-3xl:  clamp(2.5rem,   1rem    + 4vw,    5rem);

  /* SPACING (4px grid) */
  --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;
  --space-32: 8rem;

  /* FONTS */
  --font-display: 'Lexend', sans-serif;
  --font-body:    'Lexend', sans-serif;

  /* RADIUS */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-full: 9999px;

  /* TRANSITIONS */
  --transition-interactive: 180ms cubic-bezier(0.16, 1, 0.3, 1);

  /* CONTENT WIDTHS */
  --content-narrow: 640px;
  --content-default: 960px;
  --content-wide: 1200px;
}

/* ==========================================
   LIGHT MODE
   ========================================== */
:root, [data-theme="light"] {
  --color-bg:             #ffffff;
  --color-surface:        #fafafa;
  --color-surface-2:      #f5f5f5;
  --color-surface-offset: #efefef;
  --color-divider:        #e5e5e5;
  --color-border:         #d4d4d4;

  --color-text:           #1a1a1a;
  --color-text-muted:     #6b6b6b;
  --color-text-faint:     #a3a3a3;
  --color-text-inverse:   #ffffff;

  --color-primary:        #D4AF37;
  --color-primary-hover:  #C49B2C;
  --color-primary-active: #A88425;
  --color-primary-highlight: rgba(212, 175, 55, 0.10);
  --color-primary-bg:     rgba(212, 175, 55, 0.06);

  --shadow-sm: 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.07);
  --shadow-lg: 0 12px 32px rgba(0,0,0,0.10);
}

/* ==========================================
   DARK MODE
   ========================================== */
[data-theme="dark"] {
  --color-bg:             #111111;
  --color-surface:        #1a1a1a;
  --color-surface-2:      #222222;
  --color-surface-offset: #2a2a2a;
  --color-divider:        #333333;
  --color-border:         #444444;

  --color-text:           #e5e5e5;
  --color-text-muted:     #a0a0a0;
  --color-text-faint:     #666666;
  --color-text-inverse:   #111111;

  --color-primary:        #D4AF37;
  --color-primary-hover:  #E0C04A;
  --color-primary-active: #EDD06A;
  --color-primary-highlight: rgba(212, 175, 55, 0.15);
  --color-primary-bg:     rgba(212, 175, 55, 0.08);

  --shadow-sm: 0 1px 2px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.4);
  --shadow-lg: 0 12px 32px rgba(0,0,0,0.5);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    --color-bg:             #111111;
    --color-surface:        #1a1a1a;
    --color-surface-2:      #222222;
    --color-surface-offset: #2a2a2a;
    --color-divider:        #333333;
    --color-border:         #444444;
    --color-text:           #e5e5e5;
    --color-text-muted:     #a0a0a0;
    --color-text-faint:     #666666;
    --color-text-inverse:   #111111;
    --color-primary:        #D4AF37;
    --color-primary-hover:  #E0C04A;
    --color-primary-active: #EDD06A;
    --color-primary-highlight: rgba(212, 175, 55, 0.15);
    --color-primary-bg:     rgba(212, 175, 55, 0.08);
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.3);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.4);
    --shadow-lg: 0 12px 32px rgba(0,0,0,0.5);
  }
}

/* ==========================================
   LAYOUT
   ========================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-divider);
  padding: var(--space-4) var(--space-4);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.site-header .brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-family: var(--font-display);
  font-weight: 600;
  font-size: var(--text-lg);
  color: var(--color-text);
  text-decoration: none;
  cursor: pointer;
}

.site-header .brand .brand-icon {
  width: 32px;
  height: 32px;
  background: var(--color-primary);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #1a1a1a;
  font-weight: 700;
  font-size: var(--text-sm);
}

.theme-toggle {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-full);
  transition: background var(--transition-interactive);
  color: var(--color-text-muted);
}

.theme-toggle:hover {
  background: var(--color-surface-2);
  color: var(--color-primary);
}

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

.container {
  max-width: var(--content-wide);
  margin-inline: auto;
  padding-inline: var(--space-4);
}

@media (min-width: 768px) {
  .container {
    padding-inline: var(--space-8);
  }
}

.main-content {
  padding-top: var(--space-8);
  padding-bottom: var(--space-16);
}

@media (min-width: 768px) {
  .main-content {
    padding-top: var(--space-12);
    padding-bottom: var(--space-20);
  }
}

/* ==========================================
   HOME VIEW
   ========================================== */
.hero {
  text-align: center;
  padding: var(--space-8) 0 var(--space-4);
  max-width: var(--content-wide);
  margin-inline: auto;
  position: relative;
}

@media (min-width: 768px) {
  .hero {
    padding: var(--space-10) 0 var(--space-8);
  }
}

/* ==========================================
   HERO SHOWCASE — Two-column: Code + Features
   ========================================== */
.hero-showcase {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
  margin-top: var(--space-8);
  text-align: left;
}

@media (min-width: 900px) {
  .hero-showcase {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-6);
    align-items: start;
  }
}

/* Code window */
.hero-code-banner {
  border-radius: var(--radius-xl);
  overflow: hidden;
  background: #1e1e2e;
  border: 1px solid rgba(255,255,255,0.08);
  box-shadow:
    0 4px 24px rgba(0,0,0,0.18),
    0 1px 3px rgba(0,0,0,0.10);
  position: relative;
}

.hero-code-banner::after {
  content: '';
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(to bottom, transparent 60%, rgba(30,30,46,0.92) 100%);
  border-radius: inherit;
}

.hero-code-window {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-2) var(--space-4);
  background: rgba(255,255,255,0.04);
  border-bottom: 1px solid rgba(255,255,255,0.06);
}

.hero-code-dots {
  display: flex;
  gap: 6px;
}

.hero-code-dots span {
  width: 10px;
  height: 10px;
  border-radius: var(--radius-full);
}

.hero-code-dots span:nth-child(1) { background: #ff5f56; }
.hero-code-dots span:nth-child(2) { background: #ffbd2e; }
.hero-code-dots span:nth-child(3) { background: #27c93f; }

.hero-code-title {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.7rem;
  color: rgba(255,255,255,0.45);
  letter-spacing: 0.02em;
}

.hero-code-content {
  padding: var(--space-4) var(--space-5);
  margin: 0;
  overflow: hidden;
  max-height: 460px;
  font-family: 'JetBrains Mono', 'Fira Code', monospace;
  font-size: 0.72rem;
  line-height: 1.7;
  color: rgba(205, 214, 244, 0.85);
  white-space: pre;
}

.hero-code-content code {
  font-family: inherit;
  font-size: inherit;
  background: none;
}

/* Syntax colors */
.hc-kw      { color: #cba6f7; }
.hc-fn      { color: #89b4fa; }
.hc-str     { color: #a6e3a1; }
.hc-num     { color: #fab387; }
.hc-comment { color: rgba(147, 153, 178, 0.6); font-style: italic; }
.hc-mod     { color: #f9e2af; }

/* Features panel */
.hero-features-panel {
  background: var(--color-surface);
  border: 1px solid rgba(0,0,0,0.06);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

[data-theme="dark"] .hero-features-panel {
  border-color: rgba(255,255,255,0.06);
}

.hero-features-title {
  font-family: var(--font-display);
  font-size: var(--text-base);
  font-weight: 600;
  color: var(--color-text);
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin: 0 0 var(--space-2);
  padding-bottom: var(--space-3);
  border-bottom: 2px solid var(--color-primary);
}

.hero-features-title svg {
  width: 20px;
  height: 20px;
  color: var(--color-primary);
  flex-shrink: 0;
}

.hero-feature-group {
  padding: 0;
}

.hero-feature-group h3 {
  font-family: var(--font-display);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text);
  margin: 0 0 var(--space-1);
}

.hero-feature-group ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.hero-feature-group li {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  padding-left: var(--space-5);
  position: relative;
  line-height: 1.5;
}

.hero-feature-group li::before {
  content: '';
  position: absolute;
  left: var(--space-2);
  top: 0.5em;
  width: 5px;
  height: 5px;
  border-radius: var(--radius-full);
  background: var(--color-primary);
  opacity: 0.5;
}

@media (max-width: 899px) {
  .hero-code-content {
    max-height: 280px;
    font-size: 0.65rem;
    padding: var(--space-3) var(--space-4);
  }
}

.hero-overline {
  font-size: var(--text-xs);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-primary);
  margin-bottom: var(--space-3);
}

.hero h1 {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-4);
}

.hero-subtitle {
  font-size: var(--text-lg);
  color: var(--color-text-muted);
  font-weight: 400;
  margin-bottom: var(--space-6);
  margin-inline: auto;
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-4);
  margin-bottom: var(--space-8);
}

.hero-meta-item {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

.hero-meta-item svg {
  width: 18px;
  height: 18px;
  color: var(--color-primary);
  flex-shrink: 0;
}

/* Learning objectives */
.objectives-section {
  background: var(--color-surface);
  border: 1px solid rgba(0,0,0,0.05);
  border-radius: var(--radius-xl);
  padding: var(--space-6) var(--space-6);
  margin-bottom: var(--space-12);
  max-width: var(--content-default);
  margin-inline: auto;
}

[data-theme="dark"] .objectives-section {
  border-color: rgba(255,255,255,0.05);
}

.objectives-section h2 {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 600;
  margin-bottom: var(--space-4);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.objectives-section h2 svg {
  width: 22px;
  height: 22px;
  color: var(--color-primary);
  flex-shrink: 0;
}

.objectives-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.objectives-list li {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  padding-left: var(--space-6);
  position: relative;
  line-height: 1.5;
}

.objectives-list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.45em;
  width: 8px;
  height: 8px;
  border-radius: var(--radius-full);
  background: var(--color-primary);
  opacity: 0.6;
}

/* Module grid */
.modules-heading {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 600;
  text-align: center;
  margin-bottom: var(--space-8);
}

.module-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
  max-width: var(--content-wide);
  margin-inline: auto;
}

@media (min-width: 640px) {
  .module-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* Module cards */
.module-card {
  background: var(--color-surface);
  border: 1px solid rgba(0,0,0,0.05);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  transition: box-shadow var(--transition-interactive),
              border-color var(--transition-interactive),
              transform var(--transition-interactive);
  cursor: pointer;
}

[data-theme="dark"] .module-card {
  border-color: rgba(255,255,255,0.06);
}

.module-card:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--color-primary);
  transform: translateY(-2px);
}

.module-card:active {
  transform: translateY(0);
}

.module-card-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-3);
}

.module-number {
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-primary);
}

.module-hours {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  font-size: var(--text-xs);
  font-weight: 500;
  color: var(--color-text-muted);
  background: var(--color-surface-2);
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  white-space: nowrap;
}

.module-hours svg {
  width: 14px;
  height: 14px;
  flex-shrink: 0;
}

.module-card h3 {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--color-text);
  line-height: 1.3;
}

.module-card p {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.5;
  flex: 1;
}

.module-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: var(--space-2);
}

/* Progress bar */
.progress-bar {
  flex: 1;
  height: 4px;
  background: var(--color-surface-2);
  border-radius: var(--radius-full);
  margin-right: var(--space-4);
  overflow: hidden;
}

.progress-bar-fill {
  height: 100%;
  background: var(--color-primary);
  border-radius: var(--radius-full);
  transition: width 600ms cubic-bezier(0.16, 1, 0.3, 1);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-5);
  font-family: var(--font-body);
  font-weight: 500;
  font-size: var(--text-sm);
  border-radius: var(--radius-md);
  text-decoration: none;
  transition: background var(--transition-interactive),
              color var(--transition-interactive),
              box-shadow var(--transition-interactive),
              transform var(--transition-interactive),
              border-color var(--transition-interactive);
  white-space: nowrap;
}

.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(0); }

.btn-primary {
  background: var(--color-primary);
  color: #1a1a1a;
  font-weight: 600;
}

.btn-primary:hover {
  background: var(--color-primary-hover);
  box-shadow: var(--shadow-md);
}

.btn-secondary {
  background: transparent;
  color: var(--color-text);
  border: 1px solid var(--color-border);
}

.btn-secondary:hover {
  background: var(--color-surface-2);
  border-color: var(--color-primary);
}

.btn-ghost {
  background: transparent;
  color: var(--color-primary);
  padding: var(--space-2) var(--space-4);
}

.btn-ghost:hover {
  background: var(--color-primary-highlight);
}

.btn svg {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
}

.btn-sm {
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-xs);
}

/* ==========================================
   MODULE DETAIL VIEW
   ========================================== */
.module-detail {
  max-width: var(--content-default);
  margin-inline: auto;
}

.back-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  cursor: pointer;
  margin-bottom: var(--space-6);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  transition: color var(--transition-interactive), background var(--transition-interactive);
}

.back-btn:hover {
  color: var(--color-primary);
  background: var(--color-primary-highlight);
}

.back-btn svg {
  width: 18px;
  height: 18px;
}

.module-detail-header {
  margin-bottom: var(--space-8);
}

.module-detail-header .module-number {
  font-size: var(--text-sm);
  margin-bottom: var(--space-2);
  display: block;
}

.module-detail-header h1 {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-3);
}

.module-detail-meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  align-items: center;
}

.module-detail-meta .badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  font-size: var(--text-xs);
  font-weight: 500;
  color: var(--color-primary);
  background: var(--color-primary-highlight);
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
}

.module-detail-meta .badge svg {
  width: 14px;
  height: 14px;
}

/* Sections within module */
.module-section {
  margin-bottom: var(--space-10);
}

.module-section h2 {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-4);
  padding-bottom: var(--space-2);
  border-bottom: 2px solid var(--color-primary);
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
}

.module-section h2 svg {
  width: 22px;
  height: 22px;
  color: var(--color-primary);
  flex-shrink: 0;
}

.module-section h3 {
  font-family: var(--font-display);
  font-size: var(--text-base);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-3);
  margin-top: var(--space-6);
}

.module-section ul,
.module-section ol {
  padding-left: var(--space-6);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.module-section li {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.6;
}

.module-section p {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.7;
  margin-bottom: var(--space-4);
}

/* Code blocks */
.code-block {
  background: var(--color-surface);
  border: 1px solid rgba(0,0,0,0.05);
  border-radius: var(--radius-lg);
  overflow: hidden;
  margin: var(--space-4) 0;
}

[data-theme="dark"] .code-block {
  border-color: rgba(255,255,255,0.06);
  background: var(--color-surface);
}

.code-block-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-2) var(--space-4);
  background: var(--color-surface-2);
  border-bottom: 1px solid rgba(0,0,0,0.05);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  font-weight: 500;
}

[data-theme="dark"] .code-block-header {
  border-bottom-color: rgba(255,255,255,0.05);
}

.code-block pre {
  padding: var(--space-4);
  overflow-x: auto;
  font-size: var(--text-sm);
  line-height: 1.6;
}

.code-block code {
  font-family: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;
  font-size: 0.875em;
}

/* YouTube embeds */
.video-embed {
  margin: var(--space-6) 0;
}

.video-embed-title {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text);
  margin-bottom: var(--space-3);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.video-embed-title svg {
  width: 18px;
  height: 18px;
  color: var(--color-primary);
  flex-shrink: 0;
}

.video-wrapper {
  position: relative;
  padding-bottom: 56.25%;
  height: 0;
  overflow: hidden;
  border-radius: var(--radius-lg);
  background: var(--color-surface-2);
  border: 1px solid rgba(0,0,0,0.05);
}

[data-theme="dark"] .video-wrapper {
  border-color: rgba(255,255,255,0.06);
}

.video-wrapper iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: 0;
  border-radius: var(--radius-lg);
}

/* Resource links */
.resource-list {
  list-style: none;
  padding-left: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.resource-list li {
  padding: 0;
}

.resource-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  color: var(--color-primary);
  text-decoration: none;
  font-weight: 500;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  transition: background var(--transition-interactive), color var(--transition-interactive);
}

.resource-link:hover {
  background: var(--color-primary-highlight);
}

.resource-link svg {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
}

/* Project cards within modules */
.project-card {
  background: var(--color-primary-bg);
  border: 1px solid rgba(212, 175, 55, 0.15);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  margin: var(--space-6) 0;
}

.project-card h3 {
  margin-top: 0;
  color: var(--color-text);
}

.project-card p,
.project-card li {
  color: var(--color-text-muted);
}

/* Extension list */
.extension-list {
  background: var(--color-surface);
  border: 1px solid rgba(0,0,0,0.05);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  margin: var(--space-4) 0;
}

[data-theme="dark"] .extension-list {
  border-color: rgba(255,255,255,0.06);
}

.extension-list h4 {
  font-family: var(--font-display);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-3);
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
}

.extension-list h4 svg {
  width: 16px;
  height: 16px;
  color: var(--color-primary);
  flex-shrink: 0;
}

/* ==========================================
   FOOTER
   ========================================== */
.site-footer {
  border-top: 1px solid var(--color-divider);
  padding: var(--space-8) var(--space-4);
  text-align: center;
}

.site-footer p {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  margin-inline: auto;
}

.site-footer .disclaimer {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  margin-top: var(--space-2);
}

/* ==========================================
   VIEW TRANSITIONS
   ========================================== */
.view {
  display: none;
}

.view.active {
  display: block;
  animation: fadeIn 300ms cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes fadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}

/* Scroll reveal */
.fade-in {
  opacity: 1;
}

@supports (animation-timeline: scroll()) {
  .fade-in {
    opacity: 0;
    animation: revealFade linear both;
    animation-timeline: view();
    animation-range: entry 0% entry 100%;
  }
}

@keyframes revealFade {
  to { opacity: 1; }
}

/* ==========================================
   SKIP LINK
   ========================================== */
.skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-4);
  background: var(--color-primary);
  color: #1a1a1a;
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: var(--text-sm);
  z-index: 200;
  text-decoration: none;
}

.skip-link:focus {
  top: var(--space-2);
}

/* ==========================================
   PRISM.JS OVERRIDES (dark-neutral theme)
   ========================================== */
code[class*="language-"],
pre[class*="language-"] {
  color: var(--color-text);
  font-family: 'JetBrains Mono', 'Fira Code', monospace;
  font-size: 0.875em;
  text-align: left;
  white-space: pre;
  word-spacing: normal;
  word-break: normal;
  word-wrap: normal;
  tab-size: 4;
  hyphens: none;
  background: none;
}

pre[class*="language-"] {
  margin: 0;
  overflow: auto;
}

.token.comment,
.token.prolog,
.token.doctype,
.token.cdata { color: var(--color-text-faint); }

.token.punctuation { color: var(--color-text-muted); }

.token.property,
.token.tag,
.token.boolean,
.token.number,
.token.constant,
.token.symbol { color: var(--color-primary); }

.token.selector,
.token.attr-name,
.token.string,
.token.char,
.token.builtin { color: #6aab73; }

[data-theme="dark"] .token.selector,
[data-theme="dark"] .token.attr-name,
[data-theme="dark"] .token.string,
[data-theme="dark"] .token.char,
[data-theme="dark"] .token.builtin { color: #98c379; }

.token.operator,
.token.entity,
.token.url { color: var(--color-text-muted); }

.token.atrule,
.token.attr-value,
.token.keyword { color: #5a7fc2; }

[data-theme="dark"] .token.atrule,
[data-theme="dark"] .token.attr-value,
[data-theme="dark"] .token.keyword { color: #7eb8f7; }

.token.function { color: #c78432; }
[data-theme="dark"] .token.function { color: #e8b95a; }

.token.class-name { color: #c17d4e; }
[data-theme="dark"] .token.class-name { color: #e5a86e; }

.token.regex,
.token.important,
.token.variable { color: var(--color-text); }

/* ==========================================
   EXERCISE LISTS (ordered, gold numbers)
   ========================================== */
.exercise-list {
  padding-left: var(--space-8);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  list-style: none;
  counter-reset: exercise;
}

.exercise-list li {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.6;
  position: relative;
  counter-increment: exercise;
  padding-left: var(--space-2);
}

.exercise-list li::before {
  content: counter(exercise) ".";
  position: absolute;
  left: calc(-1 * var(--space-6));
  top: 0;
  font-weight: 600;
  color: var(--color-primary);
  font-size: var(--text-sm);
  font-family: var(--font-display);
}

/* ==========================================
   FLASHCARD GRID
   ========================================== */
.flashcard-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
}

@media (min-width: 768px) {
  .flashcard-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* Individual flashcard */
.flashcard {
  perspective: 1000px;
  cursor: pointer;
  outline: none;
}

.flashcard:focus-visible .flashcard-front {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-highlight);
}

.flashcard-inner {
  display: grid;
  transition: transform 600ms cubic-bezier(0.16, 1, 0.3, 1);
  transform-style: preserve-3d;
}

.flashcard.flipped .flashcard-inner {
  transform: rotateY(180deg);
}

.flashcard-front,
.flashcard-back {
  grid-row: 1 / -1;
  grid-column: 1 / -1;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  display: flex;
  flex-direction: column;
  min-height: 200px;
}

/* Front side */
.flashcard-front {
  background: var(--color-surface);
  border: 2px solid var(--color-border);
  transition: border-color 180ms ease, box-shadow 180ms ease;
}

.flashcard:hover .flashcard-front {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-md);
}

.flashcard.flipped:hover .flashcard-front {
  border-color: var(--color-border);
  box-shadow: none;
}

.flashcard-number {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--text-2xl);
  color: var(--color-primary);
  opacity: 0.3;
  line-height: 1;
  margin-bottom: var(--space-2);
}

.flashcard-front p {
  font-size: var(--text-sm);
  color: var(--color-text);
  line-height: 1.6;
  flex: 1;
  margin: 0;
}

.flashcard-hint {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  margin-top: var(--space-3);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.flashcard-hint::before {
  content: '';
  display: inline-block;
  width: 16px;
  height: 16px;
  background: currentColor;
  opacity: 0.4;
  -webkit-mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='currentColor' stroke-width='2'%3E%3Cpath d='M15 15l-2 5L9 9l11 4-5 2zm0 0l5 5'/%3E%3C/svg%3E") center / contain no-repeat;
  mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='currentColor' stroke-width='2'%3E%3Cpath d='M15 15l-2 5L9 9l11 4-5 2zm0 0l5 5'/%3E%3C/svg%3E") center / contain no-repeat;
  flex-shrink: 0;
}

/* Back side */
.flashcard-back {
  background: #1e1e2e;
  border: 2px solid rgba(212, 175, 55, 0.3);
  transform: rotateY(180deg);
  color: rgba(205, 214, 244, 0.85);
  overflow: hidden;
}

.flashcard-label {
  font-family: var(--font-display);
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: #D4AF37;
  margin-bottom: var(--space-3);
  flex-shrink: 0;
}

.flashcard-back pre {
  margin: 0;
  flex: 1;
  overflow: auto;
}

.flashcard-back code {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.72rem;
  line-height: 1.65;
  white-space: pre-wrap;
  word-break: break-word;
  color: rgba(205, 214, 244, 0.85);
}

.flashcard-back pre:not(:has(code)) {
  font-family: 'Lexend', sans-serif;
  font-size: var(--text-xs);
  line-height: 1.65;
  white-space: pre-wrap;
  word-break: break-word;
  color: rgba(205, 214, 244, 0.85);
}

/* Informational flashcard back (non-code: objectives, topics, projects) */
.flashcard-back-info {
  background: var(--color-bg);
  border: 2px solid var(--color-primary);
  color: var(--color-text);
  transform: rotateY(180deg);
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  display: flex;
  flex-direction: column;
  overflow: auto;
  grid-row: 1 / -1;
  grid-column: 1 / -1;
  min-height: 200px;
}

[data-theme="dark"] .flashcard-back-info {
  background: var(--color-surface);
}

.flashcard-back-info .flashcard-label {
  color: var(--color-primary);
}

.flashcard-back-info pre {
  margin: 0;
  flex: 1;
  white-space: pre-wrap;
  font-family: var(--font-body);
  font-size: var(--text-sm);
  line-height: 1.7;
  color: var(--color-text-muted);
}

@media (max-width: 767px) {
  .flashcard-back-info {
    padding: var(--space-4);
    min-height: 160px;
  }
}

/* Single-column flashcard grid for projects */
.flashcard-grid-single {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
}

/* Dark mode: front side adjustments */
[data-theme="dark"] .flashcard-front {
  background: var(--color-surface);
  border-color: var(--color-border);
}

[data-theme="dark"] .flashcard:hover .flashcard-front {
  border-color: var(--color-primary);
}

@media (max-width: 767px) {
  .flashcard-front,
  .flashcard-back {
    padding: var(--space-4);
    min-height: 160px;
  }

  .flashcard-back code {
    font-size: 0.65rem;
  }
}

/* ==========================================
   QUIZ CTA CARD (home page)
   ========================================== */
.quiz-cta-card {
  max-width: var(--content-default);
  margin-inline: auto;
  margin-bottom: var(--space-12);
  background: var(--color-bg);
  border: 1px solid rgba(0,0,0,0.05);
  border-left: 4px solid var(--color-primary);
  border-radius: var(--radius-xl);
  padding: var(--space-6) var(--space-8);
  transition: box-shadow var(--transition-interactive), border-color var(--transition-interactive);
}

[data-theme="dark"] .quiz-cta-card {
  background: var(--color-surface);
  border-color: rgba(255,255,255,0.06);
  border-left-color: var(--color-primary);
}

.quiz-cta-card:hover {
  box-shadow: var(--shadow-md);
}

.quiz-cta-content {
  display: flex;
  align-items: center;
  gap: var(--space-6);
}

.quiz-cta-icon {
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  background: var(--color-primary-highlight);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
}

.quiz-cta-icon svg {
  width: 24px;
  height: 24px;
  color: var(--color-primary);
}

.quiz-cta-text {
  flex: 1;
}

.quiz-cta-text h3 {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--color-text);
  margin: 0 0 var(--space-1);
}

.quiz-cta-text p {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  margin: 0;
  line-height: 1.5;
}

.quiz-cta-btn {
  flex-shrink: 0;
  white-space: nowrap;
}

@media (max-width: 639px) {
  .quiz-cta-content {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-4);
  }

  .quiz-cta-card {
    padding: var(--space-5) var(--space-5);
  }
}

/* ==========================================
   QUIZ INTERFACE
   ========================================== */
.quiz-container {
  max-width: var(--content-default);
  margin-inline: auto;
}

.quiz-header {
  margin-bottom: var(--space-8);
}

.quiz-header h1 {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-4);
}

.quiz-progress {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.quiz-progress-text {
  font-family: var(--font-display);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-muted);
}

.quiz-progress-bar {
  width: 100%;
  height: 6px;
  background: var(--color-surface-2);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.quiz-progress-fill {
  height: 100%;
  background: var(--color-primary);
  border-radius: var(--radius-full);
  transition: width 400ms cubic-bezier(0.16, 1, 0.3, 1);
}

.quiz-question-card {
  background: var(--color-surface);
  border: 1px solid rgba(0,0,0,0.05);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  margin-bottom: var(--space-6);
}

[data-theme="dark"] .quiz-question-card {
  border-color: rgba(255,255,255,0.06);
}

.quiz-badges {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-bottom: var(--space-4);
}

.quiz-badge {
  display: inline-flex;
  align-items: center;
  font-family: var(--font-display);
  font-size: var(--text-xs);
  font-weight: 500;
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
}

.badge-easy {
  background: rgba(34, 139, 34, 0.10);
  color: #228b22;
}

[data-theme="dark"] .badge-easy {
  background: rgba(72, 187, 72, 0.15);
  color: #48bb48;
}

.badge-medium {
  background: var(--color-primary-highlight);
  color: var(--color-primary);
}

.badge-hard {
  background: rgba(200, 50, 50, 0.10);
  color: #c83232;
}

[data-theme="dark"] .badge-hard {
  background: rgba(220, 80, 80, 0.15);
  color: #dc5050;
}

.badge-module {
  background: var(--color-surface-2);
  color: var(--color-text-muted);
}

.quiz-question {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 500;
  color: var(--color-text);
  line-height: 1.5;
  margin-bottom: var(--space-6);
}

.quiz-options {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-3);
}

@media (min-width: 640px) {
  .quiz-options {
    grid-template-columns: 1fr 1fr;
  }
}

.quiz-option {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  padding: var(--space-4) var(--space-5);
  background: var(--color-bg);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-lg);
  cursor: pointer;
  text-align: left;
  font-family: var(--font-body);
  font-size: var(--text-sm);
  color: var(--color-text);
  transition: border-color var(--transition-interactive),
              background var(--transition-interactive),
              box-shadow var(--transition-interactive);
}

.quiz-option:hover:not(.disabled) {
  border-color: var(--color-primary);
  background: var(--color-primary-bg);
}

.quiz-option.disabled {
  cursor: default;
}

.quiz-option.correct {
  border-color: #228b22;
  background: rgba(34, 139, 34, 0.08);
}

[data-theme="dark"] .quiz-option.correct {
  border-color: #48bb48;
  background: rgba(72, 187, 72, 0.10);
}

.quiz-option.incorrect {
  border-color: #c83232;
  background: rgba(200, 50, 50, 0.08);
}

[data-theme="dark"] .quiz-option.incorrect {
  border-color: #dc5050;
  background: rgba(220, 80, 80, 0.10);
}

.quiz-option-letter {
  flex-shrink: 0;
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: var(--text-xs);
  border-radius: var(--radius-md);
  background: var(--color-surface-2);
  color: var(--color-text-muted);
}

.quiz-option.correct .quiz-option-letter {
  background: #228b22;
  color: #fff;
}

[data-theme="dark"] .quiz-option.correct .quiz-option-letter {
  background: #48bb48;
  color: #111;
}

.quiz-option.incorrect .quiz-option-letter {
  background: #c83232;
  color: #fff;
}

[data-theme="dark"] .quiz-option.incorrect .quiz-option-letter {
  background: #dc5050;
  color: #111;
}

.quiz-option-text {
  padding-top: 2px;
  line-height: 1.5;
}

.quiz-option-text code {
  font-family: 'JetBrains Mono', 'Fira Code', monospace;
  font-size: 0.9em;
  background: var(--color-surface-2);
  padding: 1px 5px;
  border-radius: var(--radius-sm);
}

.quiz-explanation {
  margin-top: var(--space-5);
  padding: var(--space-4) var(--space-5);
  border-radius: var(--radius-lg);
  font-size: var(--text-sm);
  line-height: 1.6;
  color: var(--color-text);
}

.explanation-correct {
  background: rgba(34, 139, 34, 0.08);
  border-left: 3px solid #228b22;
}

[data-theme="dark"] .explanation-correct {
  background: rgba(72, 187, 72, 0.10);
  border-left-color: #48bb48;
}

.explanation-incorrect {
  background: rgba(200, 50, 50, 0.08);
  border-left: 3px solid #c83232;
}

[data-theme="dark"] .explanation-incorrect {
  background: rgba(220, 80, 80, 0.10);
  border-left-color: #dc5050;
}

.quiz-nav {
  display: flex;
  justify-content: flex-end;
  gap: var(--space-3);
  margin-top: var(--space-2);
}

/* ==========================================
   QUIZ RESULTS
   ========================================== */
.quiz-results {
  text-align: center;
  background: var(--color-surface);
  border: 1px solid rgba(0,0,0,0.05);
  border-radius: var(--radius-xl);
  padding: var(--space-10) var(--space-8);
}

[data-theme="dark"] .quiz-results {
  border-color: rgba(255,255,255,0.06);
}

.quiz-results-icon {
  margin-bottom: var(--space-4);
}

.quiz-results-icon svg {
  width: 40px;
  height: 40px;
  color: var(--color-primary);
}

.quiz-results h2 {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-6);
}

.quiz-score-ring {
  position: relative;
  width: 120px;
  height: 120px;
  margin: 0 auto var(--space-4);
}

.quiz-score-ring svg {
  width: 120px;
  height: 120px;
}

.quiz-score-pct {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-primary);
}

.quiz-score-detail {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  margin-bottom: var(--space-2);
}

.quiz-result-message {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 600;
  margin-bottom: var(--space-8);
}

.result-excellent { color: #228b22; }
.result-good { color: var(--color-primary); }
.result-study { color: #c83232; }

[data-theme="dark"] .result-excellent { color: #48bb48; }
[data-theme="dark"] .result-study { color: #dc5050; }

.quiz-results-breakdown {
  text-align: left;
  margin-bottom: var(--space-8);
}

.quiz-results-breakdown h3 {
  font-family: var(--font-display);
  font-size: var(--text-base);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-4);
  padding-bottom: var(--space-2);
  border-bottom: 2px solid var(--color-primary);
  display: inline-block;
}

.quiz-results-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.quiz-result-row {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  line-height: 1.5;
}

.quiz-result-indicator {
  flex-shrink: 0;
  width: 22px;
  height: 22px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: var(--text-xs);
  border-radius: var(--radius-full);
}

.row-correct .quiz-result-indicator {
  background: rgba(34, 139, 34, 0.12);
  color: #228b22;
}

[data-theme="dark"] .row-correct .quiz-result-indicator {
  background: rgba(72, 187, 72, 0.15);
  color: #48bb48;
}

.row-incorrect .quiz-result-indicator {
  background: rgba(200, 50, 50, 0.12);
  color: #c83232;
}

[data-theme="dark"] .row-incorrect .quiz-result-indicator {
  background: rgba(220, 80, 80, 0.15);
  color: #dc5050;
}

.quiz-result-q {
  color: var(--color-text-muted);
}

.quiz-results .quiz-nav {
  justify-content: center;
}

@media (max-width: 639px) {
  .quiz-question-card {
    padding: var(--space-5);
  }

  .quiz-question {
    font-size: var(--text-base);
  }

  .quiz-results {
    padding: var(--space-6) var(--space-4);
  }
}

/* ==========================================
   RESPONSIVE TWEAKS
   ========================================== */
@media (max-width: 639px) {
  .hero h1 {
    font-size: var(--text-xl);
  }
  
  .module-detail-header h1 {
    font-size: var(--text-lg);
  }

  .hero-meta {
    flex-direction: column;
    align-items: center;
    gap: var(--space-2);
  }
}