/* Reset & Base */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --bg-primary: #0f0f1a;
  --bg-secondary: #1a1a2e;
  --bg-card: #252542;
  --bg-hover: #2d2d4a;
  --text-primary: #ffffff;
  --text-secondary: #a0a4b8;
  --text-muted: #6b6f82;
  --accent-primary: #6366f1;
  --accent-secondary: #818cf8;
  --success: #10b981;
  --warning: #f59e0b;
  --danger: #ef4444;
  --border: rgba(255, 255, 255, 0.08);
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.3);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

.app {
  min-height: 100vh;
}

.screen {
  min-height: 100vh;
  animation: fadeIn 0.3s ease;
}

.hidden {
  display: none !important;
}

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

/* ==================== LOGIN SCREEN ==================== */
#login-screen {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  background:
    radial-gradient(ellipse at top, rgba(99, 102, 241, 0.15) 0%, transparent 50%),
    radial-gradient(ellipse at bottom, rgba(16, 185, 129, 0.1) 0%, transparent 50%),
    var(--bg-primary);
}

.login-container {
  width: 100%;
  max-width: 420px;
  text-align: center;
}

/* Branding */
.brand {
  margin-bottom: 8px;
}

.brand-name {
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: 3px;
  color: var(--text-primary);
}

.brand-dot {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--accent-primary);
}

.logo {
  margin-bottom: 12px;
}

.logo h1 {
  font-size: 2.25rem;
  font-weight: 700;
  background: linear-gradient(135deg, #fff 0%, #a0a4b8 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* Header brand (small) */
.header-brand {
  display: flex;
  align-items: center;
}

.brand-name-sm {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 2px;
  color: var(--text-primary);
}

.brand-dot-sm {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--accent-primary);
}

.header-divider {
  margin: 0 12px;
  color: var(--text-muted);
}

/* Scoreboard brand */
.scoreboard-brand {
  text-align: center;
  margin-bottom: 8px;
}

/* Modal */
.modal {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.modal.hidden {
  display: none;
}

.modal-backdrop {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(4px);
}

.modal-content {
  position: relative;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: 40px;
  max-width: 420px;
  width: 100%;
  text-align: center;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
  animation: modalSlideIn 0.3s ease;
}

@keyframes modalSlideIn {
  from {
    opacity: 0;
    transform: translateY(-20px) scale(0.95);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

.modal-brand {
  margin-bottom: 20px;
}

.modal-content h3 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--text-primary);
}

.modal-stats {
  font-size: 1.1rem;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.modal-stats span {
  color: var(--accent-primary);
  font-weight: 700;
}

.modal-prompt {
  color: var(--text-muted);
  margin-bottom: 28px;
}

.modal-actions {
  display: flex;
  gap: 12px;
}

.modal-actions .btn {
  flex: 1;
  padding: 14px 24px;
}

/* Footer */
.app-footer {
  padding: 20px;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.8rem;
  border-top: 1px solid var(--border);
  background: var(--bg-secondary);
}

.tagline {
  color: var(--text-secondary);
  margin-bottom: 40px;
  font-size: 1.1rem;
}

.login-form {
  background: var(--bg-secondary);
  padding: 32px;
  border-radius: var(--radius-xl);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  margin-bottom: 32px;
}

.login-form label {
  display: block;
  text-align: left;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.login-form input {
  width: 100%;
  padding: 14px 18px;
  font-size: 1rem;
  font-family: inherit;
  background: var(--bg-primary);
  border: 2px solid var(--border);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  margin-bottom: 20px;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.login-form input:focus {
  outline: none;
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.2);
}

.login-form input::placeholder {
  color: var(--text-muted);
}

/* Mode Selector */
.mode-selector {
  margin: 8px 0 20px;
  text-align: left;
}

.mode-selector label {
  display: block;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 10px;
}

.mode-toggle {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
}

.mode-btn {
  padding: 12px 16px;
  font-size: 0.95rem;
  font-weight: 600;
  font-family: inherit;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.2s;
}

.mode-btn.active {
  color: var(--text-primary);
  border-color: rgba(99, 102, 241, 0.6);
  background: rgba(99, 102, 241, 0.15);
  box-shadow: 0 6px 16px rgba(99, 102, 241, 0.2);
}

.mode-btn:hover:not(.active) {
  border-color: var(--accent-primary);
  color: var(--text-primary);
}

.mode-help {
  margin-top: 10px;
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* Returning Player */
.returning-player {
  background: rgba(99, 102, 241, 0.1);
  border: 1px solid rgba(99, 102, 241, 0.3);
  border-radius: var(--radius-md);
  padding: 16px;
  margin-bottom: 20px;
  animation: fadeIn 0.3s ease;
}

.returning-player.hidden {
  display: none;
}

.returning-header {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  margin-bottom: 12px;
  font-size: 1rem;
  color: var(--text-primary);
}

.returning-icon {
  font-size: 1.25rem;
}

.returning-header strong {
  color: var(--accent-primary);
}

.returning-stats {
  display: flex;
  justify-content: center;
  gap: 24px;
}

.returning-stat {
  text-align: center;
}

.returning-value {
  display: block;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
}

.returning-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.features {
  display: flex;
  justify-content: center;
  gap: 24px;
  flex-wrap: wrap;
}

.feature {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.feature-icon {
  font-size: 1.2rem;
}

/* ==================== BUTTONS ==================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: inherit;
  font-weight: 600;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all 0.2s;
  text-decoration: none;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  color: white;
  box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
}

.btn-primary:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(99, 102, 241, 0.4);
}

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

.btn-secondary:hover:not(:disabled) {
  background: var(--bg-hover);
}

.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
}

.btn-ghost:hover:not(:disabled) {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.05);
}

.btn-small {
  padding: 8px 16px;
  font-size: 0.875rem;
}

.btn-danger {
  background: transparent;
  color: var(--danger);
  border: 1px solid var(--danger);
  margin-top: 12px;
}

.btn-danger:hover:not(:disabled) {
  background: rgba(239, 68, 68, 0.1);
}

.btn-large {
  padding: 16px 32px;
  font-size: 1rem;
  width: 100%;
}

/* ==================== GAME SCREEN ==================== */
#game-screen {
  display: flex;
  flex-direction: column;
  padding: 0;
  background: var(--bg-primary);
}

.game-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 24px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
}

.header-left {
  display: flex;
  align-items: center;
  gap: 12px;
}

.mode-pill {
  padding: 4px 10px;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.6px;
  text-transform: uppercase;
  border-radius: 999px;
  border: 1px solid var(--border);
  color: var(--text-secondary);
  background: var(--bg-card);
}

.mode-pill[data-mode="challenge"] {
  color: var(--accent-secondary);
  border-color: rgba(129, 140, 248, 0.4);
}

.mode-pill[data-mode="study"] {
  color: var(--success);
  border-color: rgba(16, 185, 129, 0.4);
}

.player-name {
  font-weight: 600;
  font-size: 1rem;
  color: var(--text-primary);
}

.header-right {
  display: flex;
  gap: 8px;
}

/* Stats Bar */
.stats-bar {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  padding: 20px 24px;
  background: var(--bg-secondary);
}

.stat {
  text-align: center;
  padding: 16px 12px;
  background: var(--bg-card);
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
}

.stat-value {
  display: block;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.stat-label {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.stat-value.level-easy { color: var(--success); }
.stat-value.level-medium { color: var(--warning); }
.stat-value.level-hard { color: var(--danger); }

/* Category Selector */
.category-selector {
  padding: 20px 24px;
}

.category-selector.hidden {
  display: none;
}

.category-selector label {
  display: block;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 12px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.category-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 8px;
}

.category-btn {
  padding: 10px 14px;
  font-size: 0.8rem;
  font-weight: 500;
  font-family: inherit;
  background: var(--bg-card);
  border: 2px solid transparent;
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  cursor: pointer;
  transition: all 0.2s;
  text-align: left;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.category-btn:hover:not(:disabled):not(.active) {
  background: var(--bg-hover);
  border-color: var(--border);
}

.category-btn.active {
  border-color: var(--accent-primary);
  background: rgba(99, 102, 241, 0.15);
}

.category-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.category-btn.on-cooldown {
  position: relative;
}

.category-btn.on-cooldown::after {
  content: attr(data-cooldown);
  position: absolute;
  top: 4px;
  right: 4px;
  font-size: 0.65rem;
  background: var(--danger);
  color: white;
  padding: 2px 5px;
  border-radius: 4px;
  font-weight: 600;
}

/* Category Colors */
.category-btn[data-category="9"] { color: #60a5fa; }
.category-btn[data-category="10"] { color: #a78bfa; }
.category-btn[data-category="11"] { color: #f472b6; }
.category-btn[data-category="12"] { color: #fb923c; }
.category-btn[data-category="13"] { color: #facc15; }
.category-btn[data-category="14"] { color: #4ade80; }
.category-btn[data-category="15"] { color: #22d3ee; }
.category-btn[data-category="16"] { color: #c084fc; }
.category-btn[data-category="17"] { color: #34d399; }
.category-btn[data-category="18"] { color: #38bdf8; }
.category-btn[data-category="19"] { color: #fbbf24; }
.category-btn[data-category="20"] { color: #e879f9; }
.category-btn[data-category="21"] { color: #fb7185; }
.category-btn[data-category="22"] { color: #2dd4bf; }
.category-btn[data-category="23"] { color: #fca5a5; }
.category-btn[data-category="24"] { color: #94a3b8; }
.category-btn[data-category="25"] { color: #f9a8d4; }
.category-btn[data-category="26"] { color: #fcd34d; }
.category-btn[data-category="27"] { color: #86efac; }
.category-btn[data-category="28"] { color: #7dd3fc; }
.category-btn[data-category="29"] { color: #f87171; }
.category-btn[data-category="30"] { color: #a5b4fc; }
.category-btn[data-category="31"] { color: #f0abfc; }
.category-btn[data-category="32"] { color: #fdba74; }

/* Question Card */
.question-card {
  flex: 1;
  margin: 0 24px 20px;
  padding: 28px;
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  display: flex;
  flex-direction: column;
}

.question-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 24px;
  gap: 12px;
}

.question-actions {
  margin-left: auto;
  display: flex;
  gap: 8px;
}

.copy-btn {
  font-weight: 600;
  border: 1px solid var(--border);
}

.copy-btn.copied {
  color: var(--success);
  border-color: rgba(16, 185, 129, 0.5);
  background: rgba(16, 185, 129, 0.1);
}

.category-badge {
  padding: 6px 14px;
  font-size: 0.8rem;
  font-weight: 600;
  background: var(--bg-card);
  border-radius: 20px;
  border: 1px solid var(--border);
}

/* Category badge colors */
.category-badge[data-category="9"] { color: #60a5fa; border-color: rgba(96, 165, 250, 0.3); }
.category-badge[data-category="10"] { color: #a78bfa; border-color: rgba(167, 139, 250, 0.3); }
.category-badge[data-category="11"] { color: #f472b6; border-color: rgba(244, 114, 182, 0.3); }
.category-badge[data-category="12"] { color: #fb923c; border-color: rgba(251, 146, 60, 0.3); }
.category-badge[data-category="13"] { color: #facc15; border-color: rgba(250, 204, 21, 0.3); }
.category-badge[data-category="14"] { color: #4ade80; border-color: rgba(74, 222, 128, 0.3); }
.category-badge[data-category="15"] { color: #22d3ee; border-color: rgba(34, 211, 238, 0.3); }
.category-badge[data-category="16"] { color: #c084fc; border-color: rgba(192, 132, 252, 0.3); }
.category-badge[data-category="17"] { color: #34d399; border-color: rgba(52, 211, 153, 0.3); }
.category-badge[data-category="18"] { color: #38bdf8; border-color: rgba(56, 189, 248, 0.3); }
.category-badge[data-category="19"] { color: #fbbf24; border-color: rgba(251, 191, 36, 0.3); }
.category-badge[data-category="20"] { color: #e879f9; border-color: rgba(232, 121, 249, 0.3); }
.category-badge[data-category="21"] { color: #fb7185; border-color: rgba(251, 113, 133, 0.3); }
.category-badge[data-category="22"] { color: #2dd4bf; border-color: rgba(45, 212, 191, 0.3); }
.category-badge[data-category="23"] { color: #fca5a5; border-color: rgba(252, 165, 165, 0.3); }
.category-badge[data-category="24"] { color: #94a3b8; border-color: rgba(148, 163, 184, 0.3); }
.category-badge[data-category="25"] { color: #f9a8d4; border-color: rgba(249, 168, 212, 0.3); }
.category-badge[data-category="26"] { color: #fcd34d; border-color: rgba(252, 211, 77, 0.3); }
.category-badge[data-category="27"] { color: #86efac; border-color: rgba(134, 239, 172, 0.3); }
.category-badge[data-category="28"] { color: #7dd3fc; border-color: rgba(125, 211, 252, 0.3); }
.category-badge[data-category="29"] { color: #f87171; border-color: rgba(248, 113, 113, 0.3); }
.category-badge[data-category="30"] { color: #a5b4fc; border-color: rgba(165, 180, 252, 0.3); }
.category-badge[data-category="31"] { color: #f0abfc; border-color: rgba(240, 171, 252, 0.3); }
.category-badge[data-category="32"] { color: #fdba74; border-color: rgba(253, 186, 116, 0.3); }

/* Timer */
.timer-container {
  position: relative;
  width: 56px;
  height: 56px;
  flex-shrink: 0;
}

.timer-svg {
  width: 100%;
  height: 100%;
  transform: rotate(-90deg);
}

.timer-bg {
  fill: none;
  stroke: var(--bg-card);
  stroke-width: 8;
}

.timer-progress {
  fill: none;
  stroke: var(--success);
  stroke-width: 8;
  stroke-linecap: round;
  stroke-dasharray: 283;
  stroke-dashoffset: 0;
  transition: stroke-dashoffset 0.1s linear, stroke 0.3s;
}

.timer-progress.warning {
  stroke: var(--warning);
}

.timer-progress.danger {
  stroke: var(--danger);
}

.timer-text {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
}

.timer-text.warning {
  color: var(--warning);
}

.timer-text.danger {
  color: var(--danger);
  animation: pulse 0.5s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { transform: translate(-50%, -50%) scale(1); }
  50% { transform: translate(-50%, -50%) scale(1.1); }
}

.timer-container.hidden {
  visibility: hidden;
}

.difficulty-badge {
  padding: 6px 14px;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  border-radius: 20px;
}

.difficulty-badge.easy {
  background: rgba(16, 185, 129, 0.15);
  color: var(--success);
}

.difficulty-badge.medium {
  background: rgba(245, 158, 11, 0.15);
  color: var(--warning);
}

.difficulty-badge.hard {
  background: rgba(239, 68, 68, 0.15);
  color: var(--danger);
}

.question-text {
  font-size: 1.25rem;
  font-weight: 500;
  line-height: 1.6;
  margin-bottom: 28px;
  color: var(--text-primary);
}

/* Loading */
.loading {
  text-align: center;
  padding: 60px 20px;
}

.spinner {
  width: 48px;
  height: 48px;
  border: 4px solid var(--border);
  border-top-color: var(--accent-primary);
  border-radius: 50%;
  margin: 0 auto 16px;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.loading p {
  color: var(--text-muted);
  font-size: 0.9rem;
}

/* Choices */
.choices {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.choice-btn {
  display: flex;
  align-items: center;
  padding: 16px 20px;
  background: var(--bg-card);
  border: 2px solid var(--border);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 1rem;
  font-family: inherit;
  cursor: pointer;
  transition: all 0.2s;
  text-align: left;
}

.choice-btn:hover:not(.disabled) {
  background: var(--bg-hover);
  border-color: var(--accent-primary);
}

.choice-btn .letter {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background: var(--bg-primary);
  border-radius: var(--radius-sm);
  margin-right: 16px;
  font-weight: 700;
  font-size: 0.9rem;
  flex-shrink: 0;
}

.choice-btn.correct {
  background: rgba(16, 185, 129, 0.15);
  border-color: var(--success);
}

.choice-btn.correct .letter {
  background: var(--success);
  color: white;
}

.choice-btn.incorrect {
  background: rgba(239, 68, 68, 0.15);
  border-color: var(--danger);
}

.choice-btn.incorrect .letter {
  background: var(--danger);
  color: white;
}

.choice-btn.disabled {
  cursor: not-allowed;
  opacity: 0.7;
}

/* Explanation */
.explanation {
  margin-top: 18px;
  padding: 14px 16px;
  border-radius: var(--radius-md);
  background: rgba(16, 185, 129, 0.1);
  border: 1px solid rgba(16, 185, 129, 0.25);
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.5;
}

/* Author Panel */
.author-panel {
  margin-top: 18px;
  padding: 16px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  background: var(--bg-card);
}

.author-panel label {
  display: block;
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.author-panel textarea,
.modal-content textarea {
  width: 100%;
  resize: vertical;
  padding: 12px 14px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  background: var(--bg-primary);
  color: var(--text-primary);
  font-family: inherit;
  margin-bottom: 12px;
}

.author-panel textarea:focus,
.modal-content textarea:focus {
  outline: none;
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.15);
}

.author-actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

/* Feedback */
.feedback {
  margin: 0 24px 16px;
  padding: 16px 24px;
  border-radius: var(--radius-md);
  font-size: 1rem;
  font-weight: 600;
  text-align: center;
}

.feedback.correct {
  background: rgba(16, 185, 129, 0.15);
  color: var(--success);
  border: 1px solid rgba(16, 185, 129, 0.3);
}

.feedback.incorrect {
  background: rgba(239, 68, 68, 0.15);
  color: var(--danger);
  border: 1px solid rgba(239, 68, 68, 0.3);
}

.feedback.level-change {
  background: rgba(99, 102, 241, 0.15);
  color: var(--accent-secondary);
  border: 1px solid rgba(99, 102, 241, 0.3);
}

/* Game Controls */
.game-controls {
  padding: 0 24px 24px;
}

.game-controls .btn-large {
  max-width: 400px;
  margin: 0 auto;
  display: block;
}

/* ==================== SCOREBOARD ==================== */
#scoreboard-screen {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  background:
    radial-gradient(ellipse at top, rgba(99, 102, 241, 0.1) 0%, transparent 50%),
    var(--bg-primary);
}

.scoreboard-container {
  width: 100%;
  max-width: 600px;
}

.scoreboard-container h2 {
  font-size: 1.75rem;
  font-weight: 700;
  text-align: center;
  margin-bottom: 24px;
}

.scoreboard-list {
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  overflow: hidden;
  margin-bottom: 24px;
}

.scoreboard-entry {
  display: flex;
  align-items: center;
  padding: 16px 20px;
  border-bottom: 1px solid var(--border);
  transition: background 0.2s;
}

.scoreboard-entry:last-child {
  border-bottom: none;
}

.scoreboard-entry:hover {
  background: var(--bg-card);
}

.scoreboard-entry .rank {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-card);
  border-radius: var(--radius-sm);
  font-weight: 700;
  font-size: 1.1rem;
  margin-right: 16px;
  flex-shrink: 0;
}

.scoreboard-entry:nth-child(1) .rank {
  background: linear-gradient(135deg, #fbbf24, #f59e0b);
  color: #1a1a2e;
}

.scoreboard-entry:nth-child(2) .rank {
  background: linear-gradient(135deg, #9ca3af, #6b7280);
  color: #1a1a2e;
}

.scoreboard-entry:nth-child(3) .rank {
  background: linear-gradient(135deg, #d97706, #b45309);
  color: white;
}

.scoreboard-entry .name {
  flex: 1;
  font-weight: 600;
  font-size: 1rem;
}

.scoreboard-entry .stats {
  text-align: right;
}

.scoreboard-entry .score-value {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--accent-secondary);
}

.scoreboard-entry .stats-detail {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 2px;
}

.scoreboard-actions {
  display: flex;
  gap: 12px;
  justify-content: center;
}

.scoreboard-actions .btn {
  flex: 1;
  max-width: 200px;
  padding: 14px 24px;
}

/* ==================== RESPONSIVE ==================== */
@media (max-width: 768px) {
  .stats-bar {
    grid-template-columns: repeat(2, 1fr);
  }

  .category-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .question-card {
    margin: 0 16px 16px;
    padding: 20px;
  }

  .feedback {
    margin: 0 16px 12px;
  }

  .game-controls {
    padding: 0 16px 16px;
  }

  .game-header {
    padding: 12px 16px;
  }

  .category-selector {
    padding: 16px;
  }
}

@media (max-width: 480px) {
  .logo h1 {
    font-size: 1.5rem;
  }

  .login-form {
    padding: 24px;
  }

  .features {
    flex-direction: column;
    gap: 12px;
  }

  .stat-value {
    font-size: 1.25rem;
  }

  .question-text {
    font-size: 1.1rem;
  }

  .choice-btn {
    padding: 14px 16px;
    font-size: 0.95rem;
  }

  .choice-btn .letter {
    width: 32px;
    height: 32px;
    margin-right: 12px;
  }

  .scoreboard-actions {
    flex-direction: column;
  }

  .scoreboard-actions .btn {
    max-width: none;
  }
}