/* All CSS variables are defined in /theme.css — do not add :root variables here */

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: flex-start;
  flex-direction: column;
  gap: 1.5rem;
  padding: clamp(2rem, 4vw, 4rem);
  font-family: var(--font-body, 'Inter', system-ui, sans-serif);
  background:
    radial-gradient(circle at 20% 20%, var(--bg-accent), transparent 60%),
    radial-gradient(circle at 80% 10%, var(--bg-radial-2), transparent 55%),
    linear-gradient(160deg, var(--bg-gradient-start) 0%, var(--bg-gradient-end) 100%);
  color: var(--text-main);
  line-height: 1.6;
}

.flash-card-container {
  max-width: min(900px, 92vw);
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  opacity: 0;
  transition: opacity 0.6s ease;
  position: relative;
}

.flash-card-container.visible {
  opacity: 1;
}

.card-type-badge {
  position: absolute;
  top: -0.75rem;
  right: 0;
  background: var(--badge-bg);
  color: var(--text-accent);
  padding: 0.35rem 0.85rem;
  border-radius: 0.375rem;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.card-type-badge.qa {
  background: linear-gradient(135deg, var(--status-info) 0%, var(--status-info) 100%);
  color: white;
}

.card-type-badge.concept {
  background: linear-gradient(135deg, var(--xp-purple) 0%, var(--xp-purple) 100%);
  color: white;
}

.card-type-badge.section {
  background: linear-gradient(135deg, var(--status-warning) 0%, var(--status-warning) 100%);
  color: white;
}

.card-question {
  font-size: clamp(1.5rem, 4vw, 2.25rem);
  line-height: 1.3;
  margin: 0;
  margin-top: 1.5rem;
  font-weight: 700;
  color: var(--text-main);
  text-align: left;
}

.card-answer {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  text-align: left;
}

.answer-text {
  font-size: clamp(1rem, 2.5vw, 1.25rem);
  line-height: 1.7;
  margin: 0;
  color: var(--text-accent);
}

.answer-list {
  font-size: clamp(1rem, 2.5vw, 1.2rem);
  line-height: 1.8;
  margin: 0.5rem 0;
  padding-left: 1.5rem;
  color: var(--text-accent);
}

.answer-list li {
  margin: 0.5rem 0;
  padding-left: 0.25rem;
}

.answer-list li::marker {
  color: var(--good-color);
}

.table-wrapper {
  margin: 1rem 0;
  overflow-x: auto;
  border-radius: 0.5rem;
  border: 1px solid var(--code-border);
}

.answer-table {
  width: 100%;
  border-collapse: collapse;
  font-size: clamp(0.85rem, 2vw, 1rem);
  background: var(--code-bg);
}

.answer-table th,
.answer-table td {
  padding: 0.75rem;
  text-align: left;
  border-bottom: 1px solid var(--code-border);
}

.answer-table th {
  background: var(--bg-accent);
  color: var(--text-accent);
  font-weight: 600;
  text-transform: uppercase;
  font-size: 0.85em;
  letter-spacing: 0.05em;
}

.answer-table tbody tr:hover {
  background: var(--bg-hover);
}

.answer-table tbody tr:last-child td {
  border-bottom: none;
}

.code-wrapper {
  position: relative;
  background: var(--code-bg);
  border: 1px solid var(--code-border);
  border-radius: 0.5rem;
  overflow: hidden;
  margin: 0.5rem 0;
}

.code-wrapper.good {
  border-left: 4px solid var(--good-color);
}

.code-wrapper.bad {
  border-left: 4px solid var(--bad-color);
}

.code-badge {
  display: inline-block;
  padding: 0.4rem 0.8rem;
  font-size: 0.85rem;
  font-weight: 600;
  border-radius: 0 0 0.375rem 0;
  position: absolute;
  top: 0;
  right: 0;
  z-index: 1;
}

.code-badge.good {
  background: var(--good-color);
  color: white;
}

.code-badge.bad {
  background: var(--bad-color);
  color: white;
}

pre {
  margin: 0;
  padding: 3rem 1.25rem 1.25rem 1.25rem;
  overflow-x: auto;
  font-family: 'JetBrains Mono', 'Consolas', 'Monaco', monospace;
  font-size: clamp(0.8rem, 1.8vw, 0.95rem);
  line-height: 1.6;
}

code {
  font-family: inherit;
  color: var(--code-text);
}

/* Syntax highlighting is handled by highlight.js CDN themes (github-dark / github) */
code[class*="language-"],
pre[class*="language-"] {
  color: var(--code-text);
  background: none;
  font-family: 'JetBrains Mono', 'Consolas', 'Monaco', monospace;
  text-align: left;
  white-space: pre;
  word-spacing: normal;
  word-break: normal;
  word-wrap: normal;
  line-height: 1.6;
  tab-size: 4;
}

.card-meta {
  margin: 0;
  margin-top: 0.5rem;
  font-size: clamp(0.75rem, 2vw, 0.9rem);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--text-muted);
  text-align: center;
  border-top: 1px solid var(--code-border);
  padding-top: 1rem;
}

/* Scrollbar styling for code blocks */
pre::-webkit-scrollbar {
  height: 8px;
}

pre::-webkit-scrollbar-track {
  background: var(--bg-primary);
  border-radius: 4px;
}

pre::-webkit-scrollbar-thumb {
  background: var(--code-border);
  border-radius: 4px;
}

pre::-webkit-scrollbar-thumb:hover {
  background: var(--text-muted);
}

@media (max-width: 768px) {
  body {
    padding: 1.5rem 1rem;
  }

  .card-question {
    font-size: 1.5rem;
  }

  .answer-text {
    font-size: 1rem;
  }

  pre {
    padding: 2.5rem 1rem 1rem 1rem;
    font-size: 0.8rem;
  }

  .code-badge {
    font-size: 0.75rem;
    padding: 0.3rem 0.6rem;
  }
}

@media (max-width: 640px) {
  body {
    padding: 1.25rem 0.75rem;
  }

  .flash-card-container {
    gap: 1rem;
  }

  .card-question {
    font-size: 1.35rem;
    margin-top: 1rem;
  }

  .answer-text {
    font-size: 0.95rem;
  }

  .answer-list {
    font-size: 0.95rem;
    line-height: 1.6;
  }

  .flash-card-flip {
    min-height: 220px;
  }

  .card-actions {
    grid-template-columns: 1fr 1fr;
    gap: 0.5rem;
  }

  .global-nav__inner {
    padding: 0.5rem 0.75rem;
    gap: 0.35rem 0.75rem;
  }

  pre {
    padding: 2.25rem 0.85rem 0.85rem 0.85rem;
    font-size: 0.78rem;
  }

  .code-badge {
    font-size: 0.7rem;
    padding: 0.25rem 0.5rem;
  }
}

@media (max-width: 480px) {
  body {
    padding: 1rem 0.5rem;
  }

  .card-type-badge {
    font-size: 0.65rem;
    padding: 0.25rem 0.65rem;
  }

  .card-question {
    font-size: 1.2rem;
    margin-top: 0.75rem;
  }

  .answer-text {
    font-size: 0.9rem;
  }

  .flash-card-flip {
    min-height: 180px;
  }

  .card-actions {
    grid-template-columns: 1fr;
  }

  pre {
    font-size: 0.8rem;
  }

  .card-meta {
    letter-spacing: 0.1em;
  }
}

/* Wide screen optimization */
@media (min-width: 1024px) {
  .flash-card-container {
    max-width: min(1000px, 88vw);
  }

  .global-nav__inner {
    max-width: min(1000px, 88vw);
  }

  .card-question {
    font-size: 2.35rem;
  }

  .answer-text {
    font-size: 1.3rem;
  }

  .answer-list {
    font-size: 1.25rem;
  }

  pre {
    font-size: 1rem;
    padding: 3rem 1.5rem 1.5rem 1.5rem;
  }

  .card-meta {
    font-size: 0.95rem;
  }

  .flash-card-flip {
    min-height: 340px;
  }
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
  .flash-card-container,
  * {
    transition-duration: 0.01ms !important;
  }
}

/* Print styles */
@media print {
  body {
    background: white;
    color: black;
  }

  .flash-card-container {
    opacity: 1;
  }

  .code-wrapper {
    border: 1px solid #ccc;
    page-break-inside: avoid;
  }

  pre {
    background: #f5f5f5;
  }

  code {
    color: black;
  }
}

.global-nav {
  width: 100%;
}

.global-nav__inner {
  max-width: min(900px, 92vw);
  margin: 0 auto;
  padding: 0.75rem 1rem;
  background: var(--bg-secondary);
  border: 1px solid var(--code-border);
  border-radius: 0.75rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1rem;
  align-items: center;
}

.global-nav__home {
  font-weight: 600;
  color: var(--text-main);
  text-decoration: none;
}

.global-nav__icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  min-height: var(--touch-min, 2.75rem);
  min-width: var(--touch-min, 2.75rem);
  border-radius: 10px;
  border: 1px solid var(--code-border);
  background: var(--bg-secondary);
  color: var(--text-main);
  text-decoration: none;
}

.global-nav__icon svg {
  width: 17px;
  height: 17px;
}

.global-nav__icon:hover {
  border-color: var(--text-accent);
  color: var(--text-main);
}

.global-nav__links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 0.75rem;
  align-items: center;
}

.global-nav__label {
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.7rem;
  color: var(--text-muted);
}

.global-nav__links a {
  color: var(--text-accent);
  text-decoration: none;
  padding: 0.2rem 0.5rem;
  min-height: var(--touch-min, 2.75rem);
  display: inline-flex;
  align-items: center;
  border-radius: 999px;
  border: 1px solid transparent;
  font-size: 0.85rem;
}

.global-nav__links a:hover {
  border-color: var(--text-accent);
  color: var(--text-main);
}

.global-nav__links a:active,
.global-nav__links a[aria-current="page"] {
  border-color: var(--primary, var(--text-accent));
  color: var(--primary, var(--text-main));
}

.theme-switcher {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8rem;
  color: var(--text-muted);
}

.theme-switcher select {
  background: var(--bg-secondary);
  border: 1px solid var(--code-border);
  color: var(--text-main);
  padding: 0.25rem 0.6rem;
  min-height: var(--touch-min, 2.75rem);
  border-radius: 999px;
  font-family: inherit;
}

/* ── Interactive card controls (spaced-repetition buttons, filters) ──── */
.card-actions {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 0.75rem;
  margin-top: 1rem;
}

.card-actions .btn,
.btn {
  min-height: var(--touch-min, 2.75rem);
  padding: 0.65rem 1rem;
  border-radius: var(--radius-md, 0.75rem);
  border: 1px solid var(--border-soft);
  background: var(--button-bg);
  color: var(--text-main);
  cursor: pointer;
  font-weight: 600;
  font-family: inherit;
  font-size: 0.9rem;
  transition: border-color 0.2s ease, background 0.2s ease, transform 0.15s ease;
}

.btn:hover {
  border-color: var(--text-accent);
  transform: translateY(-1px);
}

.btn:active {
  background: var(--primary, var(--text-accent));
  color: var(--primary-on, #fff);
  border-color: var(--primary, var(--text-accent));
  transform: translateY(0);
}

.btn:focus-visible {
  outline: 2px solid var(--focus-ring);
  outline-offset: 2px;
}

.btn.primary,
.btn--primary {
  background: var(--primary, var(--text-accent));
  color: var(--primary-on, #fff);
  border-color: var(--primary, var(--text-accent));
}

.btn.primary:hover,
.btn--primary:hover {
  background: var(--primary-hover, var(--text-accent));
}

/* Filter toggles */
.filter-toggle,
.card-filter-btn {
  min-height: var(--touch-min, 2.75rem);
  padding: 0.4rem 0.85rem;
  border-radius: 999px;
  border: 1px solid var(--code-border);
  background: var(--bg-secondary);
  color: var(--text-accent);
  cursor: pointer;
  font-weight: 600;
  font-size: 0.8rem;
  transition: border-color 0.2s ease, background 0.2s ease;
}

.filter-toggle:hover,
.card-filter-btn:hover {
  border-color: var(--text-accent);
}

.filter-toggle.active,
.card-filter-btn.active {
  background: var(--primary, var(--text-accent));
  color: var(--primary-on, #fff);
  border-color: var(--primary, var(--text-accent));
}

/* Flash card flip area — 3D card flip */
.flash-card-flip {
  perspective: 1000px;
  min-height: 280px;
  cursor: pointer;
}

.flash-card-inner {
  position: relative;
  width: 100%;
  min-height: inherit;
  transition: transform 0.6s ease;
  transform-style: preserve-3d;
}

.flash-card-flip.flipped .flash-card-inner {
  transform: rotateY(180deg);
}

.flash-card-front,
.flash-card-back {
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
}

.flash-card-front {
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.flash-card-back {
  position: absolute;
  inset: 0;
  transform: rotateY(180deg);
  overflow-y: auto;
}

/* Depth shadow during flip */
.flash-card-inner {
  border-radius: 0.75rem;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.08);
  transition: transform 0.6s ease, box-shadow 0.6s ease;
}

.flash-card-flip.flipped .flash-card-inner {
  box-shadow: 0 8px 28px rgba(0, 0, 0, 0.15);
}

/* Reduced motion: instant flip (no 3D transform) */
@media (prefers-reduced-motion: reduce) {
  .flash-card-inner {
    transition: none !important;
  }

  .flash-card-flip:not(.flipped) .flash-card-back {
    display: none;
  }

  .flash-card-flip.flipped .flash-card-front {
    display: none;
  }

  .flash-card-flip.flipped .flash-card-back {
    position: static;
    transform: none;
  }

  .flash-card-flip.flipped .flash-card-inner {
    transform: none;
  }
}

/* Progress indicator */
.progress-bar {
  width: 100%;
  height: 6px;
  background: var(--bg-secondary);
  border-radius: 3px;
  overflow: hidden;
}

.progress-bar__fill {
  height: 100%;
  background: var(--primary, var(--text-accent));
  border-radius: 3px;
  transition: width 0.3s ease;
}

/* Card indicator dots */
.card-indicator {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--code-border);
  transition: background 0.2s ease;
}

.card-indicator.active {
  background: var(--primary, var(--text-accent));
}