/* ========================================
   QuizHub - app.css
   Modern, vibrant quiz game styles
   ======================================== */

@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;500;600;700;800&display=swap');

:root {
  --bg-primary: #0a0e1a;
  --bg-secondary: #111827;
  --bg-card: #1a2235;
  --bg-hover: #243049;
  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --accent: #06d6a0;
  --accent-glow: rgba(6, 214, 160, 0.25);
  --accent-hover: #05c493;
  --danger: #ef4444;
  --danger-glow: rgba(239, 68, 68, 0.2);
  --warning: #f59e0b;
  --correct: #06d6a0;
  --wrong: #ef4444;
  --gold: #fbbf24;
  --silver: #94a3b8;
  --bronze: #d97706;
  --border: rgba(148, 163, 184, 0.12);
  --radius: 14px;
  --radius-sm: 8px;
  --shadow: 0 8px 32px rgba(0,0,0,0.4);
  --transition: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: 'Outfit', sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* Background grain texture */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)' opacity='0.03'/%3E%3C/svg%3E");
  pointer-events: none;
  z-index: 0;
}

/* ---- Layout ---- */
.app {
  position: relative;
  z-index: 1;
  max-width: 700px;
  margin: 0 auto;
  padding: 2rem 1.25rem 4rem;
}

/* ---- Header ---- */
.header {
  text-align: left;
  margin-bottom: 2.5rem;
}

.header h1 {
  font-size: 2.25rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  background: linear-gradient(135deg, var(--accent) 0%, #38bdf8 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.header p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin-top: 0.25rem;
}

/* ---- Cards ---- */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem;
  box-shadow: var(--shadow);
}

/* ---- Join Screen ---- */
.join-screen {
  animation: fadeUp 0.5s ease;
}

.join-screen h2 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 0.35rem;
}

.join-screen .subtitle {
  color: var(--text-secondary);
  margin-bottom: 1.75rem;
  font-size: 0.9rem;
}

.input-group {
  display: flex;
  gap: 0.75rem;
}

.input-group input {
  flex: 1;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.75rem 1rem;
  color: var(--text-primary);
  font-family: inherit;
  font-size: 1rem;
  outline: none;
  transition: border-color var(--transition);
}

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

.input-group input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

.join-fields {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.join-fields input {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.75rem 1rem;
  color: var(--text-primary);
  font-family: inherit;
  font-size: 1rem;
  outline: none;
  transition: border-color var(--transition);
}

.join-fields input::placeholder { color: var(--text-muted); }

.join-fields input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

.error-msg {
  color: var(--danger);
  font-size: 0.82rem;
  margin-top: 0.5rem;
  min-height: 1.2em;
}

/* ---- Buttons ---- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  border: none;
  border-radius: var(--radius-sm);
  font-family: inherit;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
}

.btn:active {
  transform: scale(0.97);
}

.btn-primary {
  background: var(--accent);
  color: var(--bg-primary);
}

.btn-primary:hover {
  background: var(--accent-hover);
  box-shadow: 0 0 20px var(--accent-glow);
}

.btn-primary:disabled {
  opacity: 0.4;
  cursor: not-allowed;
  box-shadow: none;
}

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

.btn-secondary:hover {
  background: var(--bg-card);
  border-color: var(--accent);
}

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

.btn-danger:hover {
  background: var(--danger-glow);
}

.btn-sm {
  padding: 0.5rem 1rem;
  font-size: 0.82rem;
}

/* ---- Lobby ---- */
.lobby-screen {
  animation: fadeUp 0.4s ease;
}

.lobby-screen h2 {
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: 0.25rem;
}

.lobby-info {
  color: var(--text-secondary);
  font-size: 0.88rem;
  margin-bottom: 1.5rem;
}

.player-list {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
}

.player-chip {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.35rem 1rem;
  font-size: 0.85rem;
  color: var(--text-primary);
  animation: popIn 0.3s ease;
}

.player-chip.you {
  border-color: var(--accent);
  color: var(--accent);
  font-weight: 600;
}

.lobby-actions {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

/* ---- Question Screen ---- */
.question-screen {
  animation: fadeUp 0.35s ease;
}

.question-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.25rem;
}

.question-counter {
  font-size: 0.82rem;
  color: var(--text-muted);
  font-weight: 500;
}

.category-tag {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.2rem 0.75rem;
  font-size: 0.75rem;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.timer-bar {
  width: 100%;
  height: 4px;
  background: var(--bg-secondary);
  border-radius: 2px;
  margin-bottom: 1.5rem;
  overflow: hidden;
}

.timer-fill {
  height: 100%;
  background: var(--accent);
  border-radius: 2px;
  transition: width 1s linear, background-color 0.3s;
}

.timer-fill.warning {
  background: var(--warning);
}

.timer-fill.critical {
  background: var(--danger);
}

.question-text {
  font-size: 1.3rem;
  font-weight: 600;
  line-height: 1.4;
  margin-bottom: 1.5rem;
}

.options-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
}

.option-btn {
  background: var(--bg-secondary);
  border: 2px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 1rem;
  color: var(--text-primary);
  font-family: inherit;
  font-size: 0.95rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
  text-align: left;
  position: relative;
  overflow: hidden;
}

.option-btn:hover:not(.disabled) {
  border-color: var(--accent);
  background: var(--bg-hover);
  transform: translateY(-1px);
}

.option-btn .option-label {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.6rem;
  height: 1.6rem;
  border-radius: 50%;
  background: var(--bg-hover);
  font-size: 0.75rem;
  font-weight: 700;
  margin-right: 0.65rem;
  flex-shrink: 0;
}

.option-btn.selected {
  border-color: var(--accent);
  background: rgba(6, 214, 160, 0.08);
}

.option-btn.correct {
  border-color: var(--correct);
  background: rgba(6, 214, 160, 0.12);
}

.option-btn.correct .option-label {
  background: var(--correct);
  color: var(--bg-primary);
}

.option-btn.wrong {
  border-color: var(--wrong);
  background: rgba(239, 68, 68, 0.1);
}

.option-btn.wrong .option-label {
  background: var(--wrong);
  color: white;
}

.option-btn.disabled {
  cursor: default;
  opacity: 0.7;
}

/* ---- Result Toast ---- */
.result-toast {
  margin-top: 1.25rem;
  padding: 1rem 1.25rem;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.95rem;
  animation: fadeUp 0.3s ease;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.result-toast.correct {
  background: rgba(6, 214, 160, 0.1);
  border: 1px solid rgba(6, 214, 160, 0.3);
  color: var(--correct);
}

.result-toast.wrong {
  background: rgba(239, 68, 68, 0.1);
  border: 1px solid rgba(239, 68, 68, 0.3);
  color: var(--wrong);
}

.result-score {
  margin-left: auto;
  font-size: 1.1rem;
}

/* ---- Leaderboard ---- */
.leaderboard-screen {
  animation: fadeUp 0.4s ease;
}

.leaderboard-screen h2 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 0.25rem;
}

.leaderboard-subtitle {
  color: var(--text-secondary);
  font-size: 0.88rem;
  margin-bottom: 1.75rem;
}

.leaderboard-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin-bottom: 1.75rem;
}

.leaderboard-entry {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 0.85rem 1rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  transition: all var(--transition);
  animation: fadeUp 0.3s ease;
}

.leaderboard-entry.you {
  border-color: var(--accent);
  background: rgba(6, 214, 160, 0.06);
}

.leaderboard-entry.top-1 { border-left: 3px solid var(--gold); }
.leaderboard-entry.top-2 { border-left: 3px solid var(--silver); }
.leaderboard-entry.top-3 { border-left: 3px solid var(--bronze); }

.rank {
  font-size: 1.1rem;
  font-weight: 700;
  min-width: 2rem;
  text-align: center;
}

.rank.gold { color: var(--gold); }
.rank.silver { color: var(--silver); }
.rank.bronze { color: var(--bronze); }

.entry-name {
  flex: 1;
  font-weight: 500;
}

.entry-score {
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--accent);
}

.leaderboard-actions {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

/* ---- Waiting screen ---- */
.waiting {
  text-align: center;
  padding: 3rem 1rem;
}

.waiting .spinner {
  width: 48px;
  height: 48px;
  border: 3px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin: 0 auto 1.25rem;
}

.waiting p {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

/* ---- Animations ---- */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes popIn {
  from { opacity: 0; transform: scale(0.85); }
  to { opacity: 1; transform: scale(1); }
}

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

@keyframes pulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.08); }
}

/* ---- Countdown Screen ---- */
.countdown-screen {
  text-align: center;
  animation: fadeUp 0.4s ease;
}

.countdown-screen h2 {
  font-size: 1.75rem;
  font-weight: 800;
  margin-bottom: 0.25rem;
}

.countdown-circle {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  background: var(--bg-secondary);
  border: 4px solid var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 2rem auto;
  animation: pulse 1s ease infinite;
}

.countdown-number {
  font-size: 3rem;
  font-weight: 800;
  color: var(--accent);
}

/* ---- Timer number (in question header) ---- */
.timer-number {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--accent);
  background: var(--bg-secondary);
  padding: 0.25rem 0.75rem;
  border-radius: 999px;
}

/* ---- Answer locked message ---- */
.answer-locked {
  text-align: center;
  color: var(--accent);
  font-weight: 600;
  font-size: 0.9rem;
  margin-top: 1.25rem;
  padding: 0.75rem;
  background: rgba(6, 214, 160, 0.08);
  border-radius: var(--radius-sm);
  border: 1px solid rgba(6, 214, 160, 0.2);
  animation: fadeUp 0.3s ease;
}

/* ---- Waiting for host ---- */
.waiting-next {
  text-align: center;
  margin-top: 1.25rem;
  padding: 1rem;
  color: var(--text-secondary);
  font-size: 0.88rem;
}

.waiting-next .spinner {
  width: 28px;
  height: 28px;
  margin: 0 auto 0.5rem;
}

/* ---- Finished / Rank Screen ---- */
.finished-screen {
  text-align: center;
  animation: fadeUp 0.5s ease;
}

.finished-screen h2 {
  font-size: 2rem;
  font-weight: 800;
  margin-bottom: 1rem;
}

.rank-display {
  padding: 1.5rem;
  animation: popIn 0.5s ease;
}

.rank-label {
  font-size: 0.85rem;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 0.5rem;
}

.rank-number {
  font-size: 4rem;
  font-weight: 800;
  color: var(--text-primary);
}

.rank-number.top {
  background: linear-gradient(135deg, var(--gold), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.total-score {
  font-size: 1rem;
  color: var(--text-secondary);
  margin-top: 0.5rem;
}

/* ---- Responsive ---- */
@media (max-width: 600px) {
  .app {
    padding: 1.25rem 1rem 3rem;
  }

  .header h1 {
    font-size: 1.75rem;
  }

  .card {
    padding: 1.25rem;
  }

  .options-grid {
    grid-template-columns: 1fr;
  }

  .input-group {
    flex-direction: column;
  }

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