/* ============================================
   codetype — design tokens & styles
   ============================================ */

: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, 0.95rem + 0.25vw, 1.125rem);
  --text-lg: clamp(1.125rem, 1rem + 0.75vw, 1.5rem);
  --text-xl: clamp(1.5rem, 1.2rem + 1.25vw, 2.25rem);
  --text-2xl: clamp(2rem, 1.2rem + 2.5vw, 3.5rem);

  /* Spacing */
  --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;

  /* 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);

  /* Fonts */
  --font-mono: "JetBrains Mono", "Fira Code", "Consolas", monospace;
  --font-body: "Inter", -apple-system, sans-serif;
  --font-display: "JetBrains Mono", monospace;

  /* Content widths */
  --content-narrow: 640px;
  --content-default: 960px;
  --content-wide: 1200px;
}

/* ============================================
   Dark mode (primary)
   ============================================ */
:root,
[data-theme="dark"] {
  --color-bg: #1e1e1e;
  --color-surface: #262626;
  --color-surface-2: #2e2e2e;
  --color-surface-3: #363636;
  --color-border: #3e3e3e;
  --color-border-subtle: #333333;

  --color-text: #b8b8b8;
  --color-text-muted: #666666;
  --color-text-faint: #404040;

  --color-primary: #e2b714;
  --color-primary-hover: #c9a312;
  --color-primary-dim: rgba(226, 183, 20, 0.15);

  --color-correct: #b8b8b8;
  --color-error: #ca4754;
  --color-error-bg: rgba(202, 71, 84, 0.12);

  --color-cursor: #e2b714;
  --color-typed: #e8e8e8;

  --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);
}

/* ============================================
   Light mode
   ============================================ */
[data-theme="light"] {
  --color-bg: #f7ede1;
  --color-surface: #eaeae4;
  --color-surface-2: #e0e0da;
  --color-surface-3: #d6d6d0;
  --color-border: #c8c8c2;
  --color-border-subtle: #deded8;

  --color-text: #4a4a4a;
  --color-text-muted: #8a8a8a;
  --color-text-faint: #b0b0aa;

  --color-primary: #c9a312;
  --color-primary-hover: #a88a10;
  --color-primary-dim: rgba(201, 163, 18, 0.15);

  --color-correct: #4a4a4a;
  --color-error: #c0392b;
  --color-error-bg: rgba(192, 57, 43, 0.1);

  --color-cursor: #c9a312;
  --color-typed: #1a1a1a;

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.12);
}

@media (prefers-color-scheme: light) {
  :root:not([data-theme]) {
    --color-bg: #f5f5f0;
    --color-surface: #eaeae4;
    --color-surface-2: #e0e0da;
    --color-surface-3: #d6d6d0;
    --color-border: #c8c8c2;
    --color-border-subtle: #deded8;
    --color-text: #4a4a4a;
    --color-text-muted: #8a8a8a;
    --color-text-faint: #b0b0aa;
    --color-primary: #c9a312;
    --color-primary-hover: #a88a10;
    --color-primary-dim: rgba(201, 163, 18, 0.15);
    --color-correct: #4a4a4a;
    --color-error: #c0392b;
    --color-error-bg: rgba(192, 57, 43, 0.1);
    --color-cursor: #c9a312;
    --color-typed: #1a1a1a;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.12);
  }
}

/* ============================================
   Layout
   ============================================ */
body {
  display: flex;
  flex-direction: column;
  align-items: center;
  min-height: 100dvh;
  font-family: var(--font-body);
  overflow-x: hidden;
}

/* ============================================
   Header
   ============================================ */
.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  max-width: var(--content-wide);
  padding: var(--space-4) var(--space-6);
  gap: var(--space-4);
}

.header-left,
.header-right {
  flex-shrink: 0;
}

.header-nav {
  flex: 1;
  display: flex;
  justify-content: center;
  overflow-x: auto;
  -ms-overflow-style: none;
  scrollbar-width: none;
}
.header-nav::-webkit-scrollbar {
  display: none;
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  text-decoration: none;
  color: var(--color-text);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: -0.02em;
}
.logo svg {
  flex-shrink: 0;
}

.language-selector {
  display: flex;
  gap: var(--space-1);
  padding: var(--space-1);
  background: var(--color-surface);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border-subtle);
}

.lang-btn {
  padding: var(--space-1) var(--space-3);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 400;
  color: var(--color-text-muted);
  border-radius: var(--radius-sm);
  white-space: nowrap;
}
.lang-btn:hover {
  color: var(--color-text);
}
.lang-btn.active {
  background: var(--color-primary-dim);
  color: var(--color-primary);
  font-weight: 500;
}

.icon-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-md);
  color: var(--color-text-muted);
}
.icon-btn:hover {
  color: var(--color-text);
  background: var(--color-surface);
}

/* ============================================
   Main
   ============================================ */
.main {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  width: 100%;
  max-width: var(--content-default);
  padding: var(--space-4) var(--space-6);
  gap: var(--space-6);
}

/* ============================================
   Stats bar
   ============================================ */
.stats-bar {
  display: flex;
  gap: var(--space-8);
  opacity: 0;
  transition: opacity 300ms ease;
}
.stats-bar.visible {
  opacity: 1;
}

.stat {
  display: flex;
  align-items: baseline;
  gap: var(--space-2);
}
.stat-value {
  font-family: var(--font-mono);
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-primary);
  font-variant-numeric: tabular-nums;
  min-width: 2ch;
}
.stat-label {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

/* ============================================
   Timer selector
   ============================================ */
.timer-selector {
  display: flex;
  gap: var(--space-1);
  padding: var(--space-1);
  background: var(--color-surface);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border-subtle);
}

.timer-btn {
  padding: var(--space-1) var(--space-3);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 400;
  color: var(--color-text-muted);
  border-radius: var(--radius-sm);
  white-space: nowrap;
}
.timer-btn:hover {
  color: var(--color-text);
}
.timer-btn.active {
  background: var(--color-primary-dim);
  color: var(--color-primary);
  font-weight: 500;
}

.countdown-display {
  font-family: var(--font-mono);
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-primary);
  font-variant-numeric: tabular-nums;
  min-width: 3ch;
  text-align: center;
  opacity: 0;
  transition: opacity 300ms ease;
}
.countdown-display.visible {
  opacity: 1;
}

/* ============================================
   Typing section
   ============================================ */
.typing-section {
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.code-source {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}
.source-label {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-text-faint);
}
.source-label a {
  color: var(--color-text-muted);
  text-decoration: none;
}
.source-label a:hover {
  color: var(--color-primary);
}

.typing-area {
  position: relative;
  padding: var(--space-6) var(--space-8);
  background: var(--color-surface);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-lg);
  cursor: text;
  min-height: 200px;
  transition: border-color var(--transition-interactive);
}
.typing-area:focus-within {
  border-color: var(--color-border);
  outline: none;
}
.typing-area.focused {
  border-color: var(--color-primary);
  outline: none;
}

.hidden-input {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  cursor: text;
  resize: none;
  border: none;
  background: transparent;
  z-index: 2;
}

.code-display {
  font-family: var(--font-mono);
  font-size: clamp(0.875rem, 0.8rem + 0.4vw, 1.05rem);
  line-height: 1.8;
  white-space: pre-wrap;
  word-break: break-all;
  position: relative;
  z-index: 1;
  pointer-events: none;
  color: var(--color-text-faint);
  tab-size: 2;
}

.char {
  position: relative;
  transition: color 50ms ease;
}
.char.correct {
  color: var(--color-typed);
}
.char.incorrect {
  color: var(--color-error);
  background: var(--color-error-bg);
  border-radius: 2px;
  /* Original character stays visible — text is never replaced */
}
.char.current {
  /* nothing — cursor handled separately */
}
.char.indent {
  opacity: 0.2;
}
.char.auto-skipped {
  opacity: 0.25;
  color: var(--color-text-faint);
}

/* Blinking cursor */
.cursor {
  position: absolute;
  width: 2px;
  height: 1.3em;
  background: var(--color-cursor);
  border-radius: 1px;
  top: 0.15em;
  left: -1px;
  animation: blink 1s step-end infinite;
  pointer-events: none;
  z-index: 5;
}
.typing-area.active .cursor {
  animation: none;
}

@keyframes blink {
  0%,
  100% {
    opacity: 1;
  }
  50% {
    opacity: 0;
  }
}

.typing-hint {
  text-align: center;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  transition: opacity 300ms ease;
}
.typing-hint.hidden {
  opacity: 0;
  pointer-events: none;
}

/* ============================================
   Results overlay
   ============================================ */
.results-overlay {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  z-index: 100;
  opacity: 0;
  transition: opacity 300ms ease;
}
.results-overlay.visible {
  opacity: 1;
}
.results-overlay[hidden] {
  display: none;
}

.results-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-10) var(--space-12);
  max-width: 560px;
  width: 90%;
  transform: translateY(20px);
  transition: transform 300ms cubic-bezier(0.16, 1, 0.3, 1);
}
.results-overlay.visible .results-card {
  transform: translateY(0);
}

.results-title {
  font-family: var(--font-mono);
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-8);
  text-align: center;
}

.results-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-6) var(--space-8);
  margin-bottom: var(--space-8);
}
.result-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-1);
}
.result-value {
  font-family: var(--font-mono);
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-text);
  font-variant-numeric: tabular-nums;
}
.result-wpm .result-value {
  color: var(--color-primary);
}
.result-label {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

.results-actions {
  display: flex;
  justify-content: center;
  gap: var(--space-3);
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  font-weight: 500;
  border-radius: var(--radius-md);
  cursor: pointer;
  border: 1px solid transparent;
}
.btn-primary {
  background: var(--color-primary);
  color: var(--color-bg);
}
.btn-primary:hover {
  background: var(--color-primary-hover);
}

/* ============================================
   Controls
   ============================================ */
.controls {
  display: flex;
  gap: var(--space-3);
}

.control-btn {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border-subtle);
  background: transparent;
}
.control-btn:hover {
  color: var(--color-text);
  border-color: var(--color-border);
  background: var(--color-surface);
}

/* ============================================
   Footer
   ============================================ */
.footer {
  width: 100%;
  padding: var(--space-6) var(--space-6) var(--space-4);
  text-align: center;
}
.footer a {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  text-decoration: none;
}
.footer a:hover {
  color: var(--color-text-muted);
}

/* ============================================
   Loading state
   ============================================ */
@keyframes shimmer {
  0% {
    background-position: -200% 0;
  }
  100% {
    background-position: 200% 0;
  }
}
.skeleton-line {
  height: 1.1em;
  margin-bottom: var(--space-2);
  background: linear-gradient(
    90deg,
    var(--color-surface-2) 25%,
    var(--color-surface-3) 50%,
    var(--color-surface-2) 75%
  );
  background-size: 200% 100%;
  animation: shimmer 1.5s ease-in-out infinite;
  border-radius: var(--radius-sm);
}
.skeleton-line:nth-child(2) {
  width: 85%;
}
.skeleton-line:nth-child(3) {
  width: 70%;
}
.skeleton-line:nth-child(4) {
  width: 90%;
}
.skeleton-line:nth-child(5) {
  width: 60%;
}
.skeleton-line:nth-child(6) {
  width: 78%;
}

/* ============================================
   Responsive
   ============================================ */
@media (max-width: 768px) {
  .header {
    flex-wrap: wrap;
    padding: var(--space-3) var(--space-4);
    gap: var(--space-3);
  }
  .header-nav {
    order: 3;
    width: 100%;
    justify-content: flex-start;
  }
  .language-selector {
    gap: 0;
  }
  .lang-btn {
    padding: var(--space-1) var(--space-2);
    font-size: 0.7rem;
  }
  .typing-area {
    padding: var(--space-4);
  }
  .stats-bar {
    gap: var(--space-4);
    flex-wrap: wrap;
    justify-content: center;
  }
  .stat-value {
    font-size: var(--text-lg);
  }
  .results-card {
    padding: var(--space-6) var(--space-4);
  }
  .results-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-4);
  }
  .code-display {
    font-size: 0.8rem;
  }
  .timer-selector {
    gap: 0;
  }
  .timer-btn {
    padding: var(--space-1) var(--space-2);
  }
}

@media (max-width: 480px) {
  .stats-bar {
    gap: var(--space-3);
  }
  .stat {
    flex-direction: column;
    align-items: center;
    gap: 0;
  }
  .results-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}