/* ========== DESIGN TOKENS ========== */
:root,
[data-theme='dark'] {
  --font-display: 'Clash Display', 'Arial Black', sans-serif;
  --font-body: 'Satoshi', 'Inter', sans-serif;

  --color-bg: #0a0a12;
  --color-surface: #13131f;
  --color-card: #1a1a2e;
  --color-border: rgba(255, 255, 255, 0.07);
  --color-border-strong: rgba(255, 255, 255, 0.14);

  --color-text: #e4e4eb;
  --color-text-muted: #71717a;
  --color-text-faint: #3f3f4a;

  --color-accent: #818cf8;
  --color-accent-hover: #a5b4fc;
  --color-accent-glow: rgba(129, 140, 248, 0.2);
  --color-accent-subtle: rgba(129, 140, 248, 0.1);

  --color-correct: #34d399;
  --color-correct-glow: rgba(52, 211, 153, 0.15);
  --color-correct-subtle: rgba(52, 211, 153, 0.08);
  --color-miss: #f87171;
  --color-miss-glow: rgba(248, 113, 113, 0.15);

  --color-btn-primary-text: #0a0a12;
  --color-toast-text: #0a0a12;

  --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);
  --text-3xl: clamp(2.5rem, 1rem + 4vw, 5rem);

  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;

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

  --transition-fast: 180ms cubic-bezier(0.16, 1, 0.3, 1);
  --transition-smooth: 400ms cubic-bezier(0.16, 1, 0.3, 1);
  --transition-slow: 600ms cubic-bezier(0.16, 1, 0.3, 1);

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.25);
}

/* ========== LIGHT THEME ========== */
[data-theme='light'] {
  --color-bg: #F5F2EC;
  --color-surface: #EBE8E2;
  --color-card: #E2DED7;
  --color-border: rgba(0, 0, 0, 0.07);
  --color-border-strong: rgba(0, 0, 0, 0.13);

  --color-text: #1c1917;
  --color-text-muted: #78716c;
  --color-text-faint: #b8b2aa;

  --color-accent: #6366f1;
  --color-accent-hover: #4f46e5;
  --color-accent-glow: rgba(99, 102, 241, 0.18);
  --color-accent-subtle: rgba(99, 102, 241, 0.08);

  --color-correct: #059669;
  --color-correct-glow: rgba(5, 150, 105, 0.12);
  --color-correct-subtle: rgba(5, 150, 105, 0.06);
  --color-miss: #dc2626;
  --color-miss-glow: rgba(220, 38, 38, 0.1);

  --color-btn-primary-text: #ffffff;
  --color-toast-text: #ffffff;

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

/* Auto system preference fallback */
@media (prefers-color-scheme: light) {
  :root:not([data-theme]) {
    --color-bg: #F5F2EC;
    --color-surface: #EBE8E2;
    --color-card: #E2DED7;
    --color-border: rgba(0, 0, 0, 0.07);
    --color-border-strong: rgba(0, 0, 0, 0.13);
    --color-text: #1c1917;
    --color-text-muted: #78716c;
    --color-text-faint: #b8b2aa;
    --color-accent: #6366f1;
    --color-accent-hover: #4f46e5;
    --color-accent-glow: rgba(99, 102, 241, 0.18);
    --color-accent-subtle: rgba(99, 102, 241, 0.08);
    --color-correct: #059669;
    --color-correct-glow: rgba(5, 150, 105, 0.12);
    --color-correct-subtle: rgba(5, 150, 105, 0.06);
    --color-miss: #dc2626;
    --color-miss-glow: rgba(220, 38, 38, 0.1);
    --color-btn-primary-text: #ffffff;
    --color-toast-text: #ffffff;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
  }
}

/* ========== BASE RESET ========== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

body {
  min-height: 100dvh;
  font-family: var(--font-body);
  font-size: var(--text-base);
  color: var(--color-text);
  background-color: var(--color-bg);
  line-height: 1.5;
  overflow: hidden;
  transition: background-color 300ms ease, color 300ms ease;
}

button { cursor: pointer; background: none; border: none; font: inherit; color: inherit; }
input { font: inherit; color: inherit; }

/* ========== THEME TOGGLE ========== */
.theme-toggle {
  position: fixed;
  top: var(--space-4);
  right: var(--space-4);
  z-index: 200;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  background: var(--color-surface);
  border: 1px solid var(--color-border-strong);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-muted);
  transition: background var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast);
}

.theme-toggle:hover {
  color: var(--color-text);
  border-color: var(--color-text-muted);
}

/* Show moon in dark, sun in light */
[data-theme='dark'] .sun-icon { display: none; }
[data-theme='dark'] .moon-icon { display: block; }
[data-theme='light'] .sun-icon { display: block; }
[data-theme='light'] .moon-icon { display: none; }

/* ========== APP LAYOUT ========== */
#app {
  position: relative;
  width: 100%;
  height: 100dvh;
  overflow: hidden;
}

.screen {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-6);
  opacity: 0;
  pointer-events: none;
  transform: translateY(12px);
  transition: opacity var(--transition-smooth), transform var(--transition-smooth);
}

.screen.active {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

/* ========== START SCREEN ========== */
.start-container { text-align: center; max-width: 420px; width: 100%; }

.logo-mark {
  color: var(--color-text);
  margin-bottom: var(--space-4);
  display: flex;
  justify-content: center;
}

.game-title {
  font-family: var(--font-display);
  font-size: var(--text-3xl);
  font-weight: 700;
  line-height: 0.95;
  letter-spacing: -0.02em;
  color: var(--color-text);
  margin-bottom: var(--space-2);
}

.game-tagline {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: var(--space-8);
}

/* Challenger Banner */
.challenger-banner {
  background: var(--color-surface);
  border: 1px solid var(--color-accent);
  border-radius: var(--radius-lg);
  padding: var(--space-4) var(--space-6);
  margin-bottom: var(--space-8);
  box-shadow: 0 0 24px var(--color-accent-glow);
}

.challenger-text { font-size: var(--text-base); color: var(--color-text); font-weight: 500; }
.challenger-text strong {
  color: var(--color-accent);
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 700;
}

.challenger-cta { font-size: var(--text-sm); color: var(--color-accent); font-weight: 600; margin-top: var(--space-1); }
.out-of { color: var(--color-text-muted); font-weight: 400; font-size: 0.8em; }

.start-form { display: flex; flex-direction: column; gap: var(--space-3); margin-bottom: var(--space-4); }

.name-input {
  background: var(--color-surface);
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-md);
  padding: var(--space-3) var(--space-4);
  font-size: var(--text-base);
  text-align: center;
  color: var(--color-text);
  outline: none;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}
.name-input::placeholder { color: var(--color-text-faint); }
.name-input:focus { border-color: var(--color-accent); box-shadow: 0 0 0 3px var(--color-accent-glow); }

.start-hint { font-size: var(--text-xs); color: var(--color-text-faint); }

/* ========== BUTTONS ========== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-3) var(--space-8);
  border-radius: var(--radius-md);
  font-family: var(--font-display);
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  transition: all var(--transition-fast);
  min-height: 48px;
}

.btn-primary { background: var(--color-accent); color: var(--color-btn-primary-text); }
.btn-primary:hover:not(:disabled) { background: var(--color-accent-hover); box-shadow: 0 0 20px var(--color-accent-glow); }
.btn-primary:disabled { opacity: 0.35; cursor: not-allowed; }

.btn-secondary { background: var(--color-surface); border: 1px solid var(--color-border-strong); color: var(--color-text); }
.btn-secondary:hover { background: var(--color-card); border-color: var(--color-text-muted); }

/* ========== QUESTION SCREEN ========== */
.question-container { text-align: center; max-width: 560px; width: 100%; }

.round-indicator {
  font-family: var(--font-display);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text-muted);
  letter-spacing: 0.1em;
  margin-bottom: var(--space-6);
}
.round-indicator span:first-child { color: var(--color-accent); font-size: var(--text-lg); }
.round-sep { margin: 0 var(--space-1); }

.question-text {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 600;
  line-height: 1.2;
  color: var(--color-text);
  margin-bottom: var(--space-10);
}

/* ========== CUSTOM SLIDER ========== */
.slider-wrapper { margin-bottom: var(--space-8); user-select: none; -webkit-user-select: none; }

.slider-labels { display: flex; justify-content: space-between; align-items: center; margin-bottom: var(--space-2); }
.slider-label { font-size: var(--text-xs); color: var(--color-text-muted); font-variant-numeric: tabular-nums lining-nums; }
.unit-label { color: var(--color-text-faint); text-transform: uppercase; letter-spacing: 0.08em; font-weight: 500; }

.slider-track-container { padding: var(--space-4) 0; }

.slider-track {
  position: relative;
  height: 6px;
  background: var(--color-surface);
  border-radius: var(--radius-full);
  cursor: pointer;
  border: 1px solid var(--color-border);
}

.slider-fill {
  position: absolute; left: 0; top: -1px;
  height: calc(100% + 2px); width: 50%;
  background: linear-gradient(90deg, var(--color-accent), var(--color-accent-hover));
  border-radius: var(--radius-full);
  pointer-events: none;
  transition: width 30ms linear;
}

.slider-thumb {
  position: absolute; top: 50%; left: 50%;
  width: 28px; height: 28px;
  background: var(--color-accent);
  border: 3px solid var(--color-bg);
  border-radius: 50%;
  transform: translate(-50%, -50%);
  cursor: grab;
  box-shadow: 0 0 12px var(--color-accent-glow);
  transition: box-shadow var(--transition-fast), transform var(--transition-fast), border-color 300ms ease;
}
.slider-thumb:hover, .slider-thumb.dragging {
  box-shadow: 0 0 24px var(--color-accent-glow);
  transform: translate(-50%, -50%) scale(1.15);
}

.slider-value-display { margin-top: var(--space-3); }
.slider-value {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 700;
  color: var(--color-accent);
  font-variant-numeric: tabular-nums lining-nums;
}

/* ====================================================
   REVEAL SCREEN — Clean staggered dual-bar layout
   ==================================================== */
.reveal-container {
  text-align: center;
  max-width: 480px;
  width: 100%;
}

.reveal-question {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-8);
  line-height: 1.25;
}

/* Stagger system: all reveal-el start hidden, then cascade in */
.reveal-el {
  opacity: 0;
  transform: translateY(10px);
  transition: opacity 400ms cubic-bezier(0.16, 1, 0.3, 1),
              transform 400ms cubic-bezier(0.16, 1, 0.3, 1);
}

.reveal-el.visible {
  opacity: 1;
  transform: translateY(0);
}

/* -- Dual bar rows -- */
.reveal-row {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-3);
}

.reveal-row-label {
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  width: 56px;
  text-align: right;
  flex-shrink: 0;
}

.guess-label { color: var(--color-accent); }
.answer-label { color: var(--color-correct); }

.reveal-row-track {
  flex: 1;
  height: 14px;
  background: var(--color-surface);
  border-radius: var(--radius-full);
  overflow: hidden;
  border: 1px solid var(--color-border);
  position: relative;
}

.reveal-row-fill {
  height: 100%;
  border-radius: var(--radius-full);
  width: 0;
  transition: width 700ms cubic-bezier(0.22, 1, 0.36, 1);
}

.guess-fill { background: var(--color-accent); }
.answer-fill { background: var(--color-correct); }

.reveal-row-value {
  font-family: var(--font-display);
  font-size: var(--text-sm);
  font-weight: 700;
  font-variant-numeric: tabular-nums lining-nums;
  width: 64px;
  text-align: left;
  flex-shrink: 0;
}

.guess-value { color: var(--color-accent); }
.answer-value { color: var(--color-correct); }

/* Range labels under bars */
.reveal-range-labels {
  display: flex;
  justify-content: space-between;
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  font-variant-numeric: tabular-nums;
  padding-left: calc(56px + var(--space-3));
  padding-right: calc(64px + var(--space-3));
  margin-bottom: var(--space-8);
}

/* Score block */
.reveal-score-block {
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: var(--space-2);
  margin-bottom: var(--space-4);
  padding: var(--space-4) 0;
}

.reveal-score-num {
  font-family: var(--font-display);
  font-size: var(--text-3xl);
  font-weight: 700;
  line-height: 1;
  color: var(--color-text);
  font-variant-numeric: tabular-nums lining-nums;
}

/* Dynamic score color applied via JS class */
.reveal-score-num.score-great { color: var(--color-correct); }
.reveal-score-num.score-good { color: var(--color-accent); }
.reveal-score-num.score-ok { color: var(--color-text-muted); }
.reveal-score-num.score-bad { color: var(--color-miss); }

.reveal-score-label {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-weight: 500;
}

/* Footer */
.reveal-footer { margin-bottom: var(--space-6); }

.reveal-explanation {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  max-width: 360px;
  margin: 0 auto;
  line-height: 1.5;
  margin-bottom: var(--space-3);
}

.reveal-running-total {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  font-variant-numeric: tabular-nums;
}
.reveal-running-total strong {
  color: var(--color-text);
  font-family: var(--font-display);
  font-weight: 700;
}

/* ========== RESULTS SCREEN ========== */
.results-container {
  text-align: center;
  max-width: 480px;
  width: 100%;
  max-height: 100dvh;
  overflow-y: auto;
  padding: var(--space-6) 0;
  scrollbar-width: thin;
  scrollbar-color: var(--color-border) transparent;
}

.results-title {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--color-text-muted);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-bottom: var(--space-4);
}

.results-score-display { margin-bottom: var(--space-6); }
.results-score {
  font-family: var(--font-display);
  font-size: var(--text-3xl);
  font-weight: 700;
  color: var(--color-text);
  font-variant-numeric: tabular-nums;
}
.results-out-of {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  color: var(--color-text-faint);
  font-weight: 500;
}

/* Comparison bars */
.results-comparison { margin-bottom: var(--space-6); text-align: left; }
.comparison-row { display: flex; align-items: center; gap: var(--space-3); margin-bottom: var(--space-2); }
.comparison-name {
  font-size: var(--text-sm); font-weight: 600; width: 80px; text-align: right; flex-shrink: 0;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.comparison-bar-bg {
  flex: 1; height: 14px; background: var(--color-surface); border-radius: var(--radius-full);
  overflow: hidden; border: 1px solid var(--color-border);
}
.comparison-bar {
  height: 100%; border-radius: var(--radius-full);
  transition: width 800ms cubic-bezier(0.16, 1, 0.3, 1); width: 0;
}
.you-bar { background: var(--color-accent); }
.challenger-bar { background: var(--color-text-muted); }
.comparison-score {
  font-family: var(--font-display); font-size: var(--text-sm); font-weight: 700;
  width: 40px; text-align: left; font-variant-numeric: tabular-nums;
}

/* Breakdown */
.results-breakdown { margin-bottom: var(--space-6); }
.breakdown-row {
  display: flex; align-items: center; gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  background: var(--color-surface); border-radius: var(--radius-md);
  margin-bottom: var(--space-2); border: 1px solid var(--color-border); text-align: left;
}
.breakdown-num { font-family: var(--font-display); font-size: var(--text-xs); font-weight: 700; color: var(--color-text-faint); width: 20px; flex-shrink: 0; }
.breakdown-info { flex: 1; min-width: 0; }
.breakdown-q { font-size: var(--text-xs); color: var(--color-text-muted); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; line-height: 1.3; }
.breakdown-detail { font-size: 12px; color: var(--color-text-faint); font-variant-numeric: tabular-nums; }
.breakdown-pts {
  font-family: var(--font-display); font-size: var(--text-sm); font-weight: 700;
  flex-shrink: 0; font-variant-numeric: tabular-nums; min-width: 36px; text-align: right;
}
.pts-great { color: var(--color-correct); }
.pts-good { color: var(--color-accent); }
.pts-ok { color: var(--color-text-muted); }
.pts-bad { color: var(--color-miss); }

.results-actions { display: flex; flex-direction: column; gap: var(--space-3); }

/* Share Toast */
.share-toast {
  position: fixed; bottom: var(--space-6); left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: var(--color-correct); color: var(--color-toast-text);
  font-size: var(--text-sm); font-weight: 600;
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-full);
  opacity: 0;
  transition: opacity var(--transition-fast), transform var(--transition-fast);
  pointer-events: none; z-index: 100;
}
.share-toast.visible { opacity: 1; transform: translateX(-50%) translateY(0); }

/* ========== UTILITIES ========== */
.hidden { display: none; }

#confetti-canvas { position: fixed; inset: 0; pointer-events: none; z-index: 50; }

/* ========== RESPONSIVE ========== */
@media (max-width: 480px) {
  .screen { padding: var(--space-4); }
  .game-title { font-size: clamp(2.5rem, 12vw, 4rem); }
  .question-text { font-size: var(--text-lg); }
  .slider-thumb { width: 34px; height: 34px; }
  .reveal-row-label { width: 44px; font-size: 12px; }
  .reveal-row-value { width: 52px; font-size: 13px; }
  .reveal-range-labels {
    padding-left: calc(44px + var(--space-3));
    padding-right: calc(52px + var(--space-3));
  }
  .comparison-name { width: 60px; font-size: 13px; }
  .results-container { padding: var(--space-4) 0; }
}

/* ========== ANIMATIONS ========== */
@keyframes fade-in-up {
  from { opacity: 0; transform: translateY(16px); }
  to { opacity: 1; transform: translateY(0); }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}