/* ==========================================================================
   TableMaster 11–19 Design System & Stylesheet
   ========================================================================== */

/* --- Root Color System (Dark & Light Themes) --- */
:root[data-theme="dark"] {
  --bg-primary: #08172d;
  --bg-secondary: #102551;
  --bg-card: rgba(16, 37, 79, 0.85);
  --bg-card-hover: rgba(23, 51, 102, 0.9);
  --border-color: rgba(215, 235, 255, 0.14);
  --border-glow: rgba(109, 225, 255, 0.35);
  
  --text-main: #f7fbff;
  --text-muted: #cbd5e1;
  --text-dim: #94a3b8;

  --accent-primary: #22d3ee;
  --accent-primary-hover: #38bdf8;
  --accent-gradient: linear-gradient(135deg, #22d3ee 0%, #818cf8 45%, #f472b6 100%);
  
  --success-color: #34d399;
  --success-bg: rgba(52, 211, 153, 0.18);
  --danger-color: #fb7185;
  --danger-bg: rgba(251, 113, 133, 0.15);
  --warning-color: #fbbf24;
  --warning-bg: rgba(251, 191, 36, 0.18);
  
  --shadow-sm: 0 6px 18px -8px rgba(0, 0, 0, 0.35);
  --shadow-lg: 0 30px 50px -20px rgba(0, 0, 0, 0.4), 0 12px 22px -14px rgba(0, 0, 0, 0.35);
  --glass-blur: blur(18px);
}

:root[data-theme="light"] {
  --bg-primary: #eff6ff;
  --bg-secondary: #ffffff;
  --bg-card: rgba(255, 255, 255, 0.95);
  --bg-card-hover: rgba(255, 255, 255, 1);
  --border-color: rgba(59, 130, 246, 0.12);
  --border-glow: rgba(56, 189, 248, 0.25);

  --text-main: #0f172a;
  --text-muted: #475569;
  --text-dim: #64748b;

  --accent-primary: #0ea5e9;
  --accent-primary-hover: #0284c7;
  --accent-gradient: linear-gradient(135deg, #0ea5e9 0%, #8b5cf6 50%, #fb7185 100%);

  --success-color: #16a34a;
  --success-bg: rgba(22, 163, 74, 0.12);
  --danger-color: #dc2626;
  --danger-bg: rgba(220, 38, 38, 0.12);
  --warning-color: #eab308;
  --warning-bg: rgba(234, 179, 8, 0.12);

  --shadow-sm: 0 6px 18px -10px rgba(15, 23, 42, 0.12);
  --shadow-lg: 0 30px 50px -20px rgba(15, 23, 42, 0.15), 0 12px 22px -14px rgba(15, 23, 42, 0.1);
  --glass-blur: blur(14px);
}

/* --- Base Reset & Typography --- */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: 'Plus Jakarta Sans', sans-serif;
  -webkit-font-smoothing: antialiased;
}

body {
  background: radial-gradient(circle at top left, rgba(56, 189, 248, 0.2), transparent 20%),
              radial-gradient(circle at bottom right, rgba(251, 191, 36, 0.18), transparent 18%),
              var(--bg-primary);
  color: var(--text-main);
  min-height: 100vh;
  overflow-x: hidden;
  position: relative;
}

/* Background Canvas for Confetti */
#confettiCanvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  pointer-events: none;
  z-index: 9999;
}

/* App Container */
.app-container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* --- Header & Navigation --- */
.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.5rem;
  background: var(--bg-card);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--border-color);
  border-radius: 18px;
  box-shadow: var(--shadow-sm);
  margin-bottom: 1.5rem;
  gap: 1rem;
  flex-wrap: wrap;
}

.logo-group {
  display: flex;
  align-items: center;
  gap: 0.85rem;
}

.logo-icon {
  width: 46px;
  height: 46px;
  border-radius: 14px;
  background: var(--accent-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #ffffff;
  font-size: 1.4rem;
  box-shadow: 0 4px 12px rgba(99, 102, 241, 0.4);
}

.logo-text h1 {
  font-family: 'Outfit', sans-serif;
  font-size: 1.35rem;
  font-weight: 800;
  line-height: 1.1;
  color: var(--text-main);
}

.logo-text h1 span {
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.logo-text p {
  font-size: 0.78rem;
  color: var(--text-muted);
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  background: rgba(0, 0, 0, 0.15);
  padding: 0.35rem;
  border-radius: 12px;
  border: 1px solid var(--border-color);
}

.nav-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  padding: 0.55rem 1rem;
  border-radius: 8px;
  font-size: 0.88rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  transition: all 0.25s ease;
}

.nav-btn:hover {
  color: var(--text-main);
  background: rgba(255, 255, 255, 0.05);
}

.nav-btn.active {
  background: var(--accent-primary);
  color: #ffffff;
  box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.icon-btn {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  font-size: 1rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s ease;
}

.icon-btn:hover {
  background: var(--accent-primary);
  color: #ffffff;
  border-color: var(--accent-primary);
  transform: translateY(-2px);
}

/* --- Content Views System --- */
.content-area {
  flex: 1;
  position: relative;
}

.view-section {
  display: none;
  animation: fadeIn 0.35s ease forwards;
}

.view-section.active {
  display: block;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

/* --- Rewards Chest Styling --- */
.rewards-header {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.rewards-summary-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(180px, 1fr));
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.reward-stat-card {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1.1rem 1.2rem;
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid var(--border-color);
}

.reward-stat-card .stat-icon {
  width: 44px;
  height: 44px;
  border-radius: 14px;
  display: grid;
  place-items: center;
  background: rgba(56, 189, 248, 0.16);
  color: var(--accent-primary);
  font-size: 1.1rem;
}

.reward-stat-card strong {
  display: block;
  font-size: 1.4rem;
  font-weight: 800;
  line-height: 1;
}

.reward-stat-card span {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.reward-progress-card {
  flex-direction: column;
  align-items: flex-start;
}

.progress-track {
  height: 12px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.08);
  width: 100%;
  margin-top: 0.9rem;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  width: 0;
  background: var(--accent-gradient);
  border-radius: 999px;
  transition: width 0.4s ease;
}

.avatar-card {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1.4rem;
  border-radius: 22px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--border-color);
}

.avatar-icon {
  width: 74px;
  height: 74px;
  border-radius: 20px;
  display: grid;
  place-items: center;
  background: rgba(99, 102, 241, 0.18);
  font-size: 2rem;
}

.chest-preview-card {
  display: flex;
  gap: 1rem;
  align-items: center;
  padding: 1.25rem 1.35rem;
  border-radius: 20px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--border-color);
  margin-bottom: 1rem;
}

.chest-wrapper {
  width: 100px;
  height: 90px;
  position: relative;
  transform-style: preserve-3d;
}

.chest-base {
  width: 100%;
  height: 60%;
  background: linear-gradient(180deg, #7c3aed, #a78bfa);
  border-radius: 0 0 18px 18px;
  position: absolute;
  bottom: 0;
  box-shadow: inset 0 6px 18px rgba(0, 0, 0, 0.15);
}

.chest-lid {
  width: 100%;
  height: 45%;
  background: linear-gradient(180deg, #38bdf8, #0ea5e9);
  border-radius: 18px 18px 0 0;
  position: absolute;
  top: 0;
  transform-origin: top center;
  transition: transform 0.5s ease;
  box-shadow: 0 10px 14px rgba(0, 0, 0, 0.12);
}

.chest-coin, .chest-coin.coin-two {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: radial-gradient(circle at 30% 30%, #fde68a, #f59e0b);
  position: absolute;
  left: 15px;
  top: 35px;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
  opacity: 0;
  transform: translateY(0) scale(0.6);
  animation: coin-sparkle 1.2s ease-out forwards;
}

.chest-coin.coin-two {
  left: 55px;
  animation-delay: 0.15s;
}

.chest-wrapper.open .chest-lid {
  transform: rotateX(-70deg);
}

.chest-wrapper.open .chest-coin {
  opacity: 1;
  transform: translateY(-60px) scale(1);
}

@keyframes coin-sparkle {
  0% { opacity: 0; transform: translateY(0) scale(0.6); }
  40% { opacity: 1; transform: translateY(-30px) scale(1.05); }
  100% { opacity: 1; transform: translateY(-60px) scale(1); }
}

.badge-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 1rem;
  margin-top: 1rem;
}

.badge-card {
  padding: 1.2rem;
  border-radius: 18px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.badge-card.unlocked {
  background: rgba(16, 185, 129, 0.12);
  border-color: rgba(16, 185, 129, 0.25);
}

.badge-card.locked {
  opacity: 0.7;
}

.badge-card h4 {
  font-size: 1rem;
  margin: 0;
}

.badge-card p {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.badge-status {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* --- Glass Card Utility --- */
.glass-card {
  background: var(--bg-card);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  padding: 1.75rem;
  box-shadow: var(--shadow-sm);
  transition: all 0.3s ease;
}

/* --- Dashboard Hero Banner --- */
.hero-banner {
  background: radial-gradient(circle at top left, rgba(56, 189, 248, 0.22), transparent 25%),
              radial-gradient(circle at bottom right, rgba(236, 72, 153, 0.18), transparent 27%),
              linear-gradient(135deg, rgba(16, 185, 129, 0.16) 0%, rgba(59, 130, 246, 0.16) 100%),
              var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 28px;
  padding: 2.5rem;
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 2rem;
  align-items: center;
  margin-bottom: 1.75rem;
  position: relative;
  overflow: hidden;
}

.hero-content h2 {
  font-family: 'Outfit', sans-serif;
  font-size: 2.2rem;
  font-weight: 800;
  margin: 0.75rem 0 0.5rem 0;
  line-height: 1.2;
}

.hero-content p {
  color: var(--text-muted);
  font-size: 1rem;
  line-height: 1.6;
  margin-bottom: 1.5rem;
}

.hero-stats {
  display: flex;
  gap: 1.2rem;
  flex-wrap: wrap;
}

.stat-badge {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  padding: 0.75rem 1.1rem;
  border-radius: 14px;
}

.stat-badge i {
  font-size: 1.4rem;
  color: var(--accent-primary);
}

.stat-badge strong {
  display: block;
  font-size: 1.15rem;
  font-weight: 700;
  line-height: 1;
}

.stat-badge span {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.reward-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid var(--border-color);
  border-radius: 999px;
  padding: 0.65rem 1rem;
  font-size: 0.9rem;
  color: var(--text-main);
  margin-top: 0.85rem;
}

.reward-highlights {
  display: flex;
  gap: 0.75rem;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 1rem;
}

.reward-coins {
  background: rgba(251, 191, 36, 0.15);
  border-color: rgba(251, 191, 36, 0.25);
}

.reward-stars {
  background: rgba(99, 102, 241, 0.14);
  border-color: rgba(99, 102, 241, 0.25);
}

.hero-visual {
  position: relative;
  height: 260px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.hero-mascot-card {
  position: absolute;
  right: -10px;
  bottom: 0;
  width: 220px;
  padding: 1rem;
  border-radius: 24px;
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.2), rgba(56, 189, 248, 0.12));
  border: 1px solid rgba(255, 255, 255, 0.16);
  box-shadow: 0 20px 35px rgba(0, 0, 0, 0.08);
  backdrop-filter: blur(12px);
}

.hero-mascot-card strong {
  display: block;
  font-size: 1rem;
  margin-bottom: 0.35rem;
}

.hero-mascot-card p {
  font-size: 0.85rem;
  color: var(--text-dim);
  line-height: 1.4;
}

.mascot-face {
  width: 52px;
  height: 52px;
  border-radius: 16px;
  background: #f8fafc;
  display: grid;
  place-items: center;
  font-size: 1.6rem;
  margin-bottom: 0.75rem;
  box-shadow: inset 0 2px 8px rgba(0,0,0,0.08);
}

.floating-math-card {
  position: absolute;
  background: var(--bg-secondary);
  border: 1px solid var(--border-glow);
  padding: 0.9rem 1.4rem;
  border-radius: 16px;
  font-family: 'Outfit', sans-serif;
  font-weight: 700;
  font-size: 1.2rem;
  box-shadow: var(--shadow-lg);
  animation: float 4s ease-in-out infinite alternate;
}

.card-1 { top: 10%; left: 10%; animation-delay: 0s; color: #818cf8; }
.card-2 { top: 50%; right: 5%; animation-delay: 1s; color: #a78bfa; }
.card-3 { bottom: 10%; left: 20%; animation-delay: 2s; color: #f472b6; }
.card-4 { top: 20%; right: 25%; animation-delay: 1.5s; color: #34d399; }

@keyframes float {
  from { transform: translateY(0px) rotate(0deg); }
  to { transform: translateY(-12px) rotate(3deg); }
}

/* --- Config & Setup Cards --- */
.config-grid {
  display: grid;
  grid-template-columns: 1.3fr 1fr;
  gap: 1.75rem;
}

.setup-card h3, .feature-highlights h3 {
  font-family: 'Outfit', sans-serif;
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 1.25rem;
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.form-group {
  margin-bottom: 1.25rem;
}

.form-group label {
  display: block;
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 0.6rem;
  color: var(--text-main);
}

.table-selector-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.chip {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  padding: 0.5rem 0.9rem;
  border-radius: 10px;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
}

.chip:hover {
  color: var(--text-main);
  border-color: var(--accent-primary);
}

.chip.active {
  background: var(--accent-primary);
  color: #ffffff;
  border-color: var(--accent-primary);
  box-shadow: 0 4px 10px rgba(99, 102, 241, 0.3);
}

.form-group-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.feedback-settings-row {
  grid-template-columns: 1fr 1fr;
}

.feedback-toggle {
  display: grid;
  gap: 0.6rem;
}

.toggle-switch {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  position: relative;
}

.toggle-switch input {
  opacity: 0;
  position: absolute;
  pointer-events: none;
}

.toggle-switch label {
  width: 44px;
  height: 26px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.12);
  position: relative;
  cursor: pointer;
  transition: background 0.25s ease;
}

.toggle-switch label::after {
  content: '';
  position: absolute;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: #ffffff;
  top: 4px;
  left: 4px;
  transition: transform 0.25s ease;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.12);
}

.toggle-switch input:checked + label {
  background: var(--accent-primary);
}

.toggle-switch input:checked + label::after {
  transform: translateX(18px);
}

.toggle-switch span {
  font-size: 0.9rem;
  color: var(--text-muted);
  font-weight: 600;
}

.custom-select {
  width: 100%;
  padding: 0.75rem 1rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  color: var(--text-main);
  font-size: 0.9rem;
  font-weight: 500;
  outline: none;
  cursor: pointer;
  transition: border-color 0.2s ease;
}

.custom-select:focus {
  border-color: var(--accent-primary);
}

.start-action-container {
  margin-top: 1.5rem;
}

/* Feature list */
.feature-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.feature-list li {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
}

.feat-icon {
  width: 38px;
  height: 38px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  flex-shrink: 0;
}

.icon-blue { background: rgba(99, 102, 241, 0.15); color: #818cf8; }
.icon-purple { background: rgba(139, 92, 246, 0.15); color: #c084fc; }
.icon-emerald { background: rgba(16, 185, 129, 0.15); color: #34d399; }
.icon-amber { background: rgba(245, 158, 11, 0.15); color: #fbbf24; }

.feature-list strong {
  display: block;
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 0.15rem;
}

.feature-list p {
  font-size: 0.82rem;
  color: var(--text-muted);
  line-height: 1.4;
}

/* --- Buttons System --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.55rem;
  padding: 0.75rem 1.4rem;
  border-radius: 12px;
  font-size: 0.92rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: all 0.25s ease;
  text-decoration: none;
}

.btn-large {
  padding: 0.95rem 1.8rem;
  font-size: 1.05rem;
  border-radius: 14px;
}

.btn-sm {
  padding: 0.45rem 0.85rem;
  font-size: 0.82rem;
  border-radius: 8px;
}

.btn-primary {
  background: var(--accent-gradient);
  color: #ffffff;
  box-shadow: 0 4px 14px rgba(99, 102, 241, 0.35);
}

.btn-primary:hover {
  opacity: 0.94;
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(99, 102, 241, 0.5);
}

.btn-glow {
  width: 100%;
  font-family: 'Outfit', sans-serif;
  font-size: 1.15rem;
  letter-spacing: 0.5px;
}

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

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: var(--accent-primary);
}

.btn-success {
  background: var(--success-color);
  color: #ffffff;
  box-shadow: 0 4px 14px rgba(16, 185, 129, 0.35);
}

.btn-success:hover {
  opacity: 0.92;
  transform: translateY(-2px);
}

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

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

.btn-subtle {
  background: transparent;
  color: var(--text-muted);
}

.btn-subtle:hover {
  color: var(--text-main);
  background: rgba(255, 255, 255, 0.05);
}

/* Badges */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.3rem 0.7rem;
  border-radius: 20px;
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.badge-accent {
  background: rgba(56, 189, 248, 0.15);
  color: #22d3ee;
  border: 1px solid rgba(56, 189, 248, 0.3);
}

.badge-primary {
  background: var(--accent-primary);
  color: #ffffff;
}

.badge-success {
  background: rgba(34, 197, 94, 0.15);
  color: #22c55e;
  border: 1px solid rgba(34, 197, 94, 0.3);
}

.badge-warning {
  background: rgba(251, 191, 36, 0.12);
  color: #f59e0b;
  border: 1px solid rgba(251, 191, 36, 0.3);
}

.badge-outline {
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-muted);
}

/* --- QUIZ VIEW --- */
.quiz-status-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.5rem;
  margin-bottom: 1.25rem;
  gap: 1.5rem;
}

.status-left, .status-right {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.q-counter {
  font-family: 'Outfit', sans-serif;
  font-weight: 700;
  font-size: 1.05rem;
}

.quiz-progress-wrapper {
  flex: 1;
  height: 8px;
  background: rgba(0, 0, 0, 0.2);
  border-radius: 10px;
  overflow: hidden;
  border: 1px solid var(--border-color);
}

.quiz-progress-bar {
  height: 100%;
  background: var(--accent-gradient);
  border-radius: 10px;
  transition: width 0.3s ease;
}

.timer-box {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  padding: 0.45rem 0.9rem;
  border-radius: 10px;
  font-family: 'Outfit', sans-serif;
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--accent-primary);
}

.timer-box.warning {
  color: var(--danger-color);
  border-color: var(--danger-color);
  animation: pulse 1s infinite alternate;
}

@keyframes pulse {
  from { opacity: 1; }
  to { opacity: 0.5; }
}

/* Question Card */
.question-card {
  min-height: 420px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 2.2rem;
}

.q-header {
  display: flex;
  gap: 0.6rem;
  margin-bottom: 1.5rem;
}

.q-prompt {
  font-family: 'Outfit', sans-serif;
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 2rem;
  color: var(--text-main);
}

.options-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.1rem;
  margin-bottom: 1.5rem;
}

.option-card {
  background: var(--bg-secondary);
  border: 2px solid var(--border-color);
  padding: 1.1rem 1.4rem;
  border-radius: 16px;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 1rem;
  transition: all 0.25s ease;
  position: relative;
  overflow: hidden;
}

.option-card.celebrate {
  transform: scale(1.04);
  box-shadow: 0 0 0 6px rgba(56, 189, 248, 0.12);
}

.option-card.shake {
  animation: shakeCard 0.35s ease;
}

@keyframes shakeCard {
  0% { transform: translateX(0); }
  25% { transform: translateX(-6px); }
  50% { transform: translateX(6px); }
  75% { transform: translateX(-4px); }
  100% { transform: translateX(0); }
}

.answer-hint {
  position: absolute;
  top: 10px;
  right: 12px;
  padding: 0.35rem 0.8rem;
  border-radius: 999px;
  font-size: 0.79rem;
  font-weight: 700;
  color: #ffffff;
  opacity: 0;
  transform: translateY(-8px);
  transition: all 0.25s ease;
  pointer-events: none;
  z-index: 2;
}

.answer-hint.visible {
  opacity: 1;
  transform: translateY(0);
}

.answer-hint.correct {
  background: linear-gradient(135deg, #34d399, #059669);
}

.answer-hint.incorrect {
  background: linear-gradient(135deg, #fb7185, #f43f5e);
}

.sparkle-burst {
  position: fixed;
  pointer-events: none;
  width: 0;
  height: 0;
  z-index: 9999;
}

.sparkle {
  position: absolute;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: radial-gradient(circle, #fef08a 0%, #f97316 90%);
  left: 0;
  top: 0;
  transform: translate(-50%, -50%);
  opacity: 0;
  animation: sparkleFly 0.8s var(--delay, 0s) ease forwards;
}

.sparkle:nth-child(2) { background: radial-gradient(circle, #38bdf8 0%, #0ea5e9 90%); }
.sparkle:nth-child(3) { background: radial-gradient(circle, #a78bfa 0%, #c084fc 90%); }

@keyframes sparkleFly {
  0% { opacity: 1; transform: translate(-50%, -50%) scale(0.6); }
  50% { opacity: 1; transform: translate(-50%, -50%) rotate(var(--angle)) translate(calc(var(--distance) / 2)) scale(1.05); }
  100% { opacity: 0; transform: translate(-50%, -50%) rotate(var(--angle)) translate(var(--distance)) scale(0.8); }
}

.option-card:hover {
  border-color: var(--accent-primary);
  background: var(--bg-card-hover);
  transform: translateY(-2px);
}

.option-key {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: 'Outfit', sans-serif;
  font-weight: 700;
  font-size: 0.9rem;
  color: var(--text-muted);
  flex-shrink: 0;
}

.option-text {
  font-family: 'Outfit', sans-serif;
  font-size: 1.3rem;
  font-weight: 600;
  color: var(--text-main);
}

.option-card.selected {
  border-color: var(--accent-primary);
  background: rgba(99, 102, 241, 0.15);
}

.option-card.selected .option-key {
  background: var(--accent-primary);
  color: #ffffff;
  border-color: var(--accent-primary);
}

.option-card.correct {
  border-color: var(--success-color) !important;
  background: var(--success-bg) !important;
}

.option-card.correct .option-key {
  background: var(--success-color) !important;
  color: #ffffff;
}

.option-card.incorrect {
  border-color: var(--danger-color) !important;
  background: var(--danger-bg) !important;
}

.option-card.incorrect .option-key {
  background: var(--danger-color) !important;
  color: #ffffff;
}

/* Explanation Box */
.explanation-box {
  background: rgba(99, 102, 241, 0.1);
  border: 1px solid var(--border-glow);
  border-radius: 14px;
  padding: 1.1rem;
  margin-bottom: 1.5rem;
  animation: slideDown 0.3s ease forwards;
}

@keyframes slideDown {
  from { opacity: 0; transform: translateY(-10px); }
  to { opacity: 1; transform: translateY(0); }
}

.exp-title {
  font-weight: 700;
  font-size: 0.9rem;
  color: var(--accent-primary);
  margin-bottom: 0.4rem;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.exp-content {
  font-size: 0.92rem;
  color: var(--text-main);
  line-height: 1.5;
}

.q-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 1.25rem;
  border-top: 1px solid var(--border-color);
}

.center-controls {
  display: flex;
  gap: 0.75rem;
}

/* --- RESULTS VIEW --- */
.results-header {
  text-align: center;
  padding: 2.5rem 1.5rem;
  margin-bottom: 1.75rem;
}

.badge-trophy {
  font-size: 3.5rem;
  margin-bottom: 0.75rem;
  animation: bounce 2s infinite alternate;
}

@keyframes bounce {
  from { transform: translateY(0); }
  to { transform: translateY(-10px); }
}

.results-header h2 {
  font-family: 'Outfit', sans-serif;
  font-size: 2.2rem;
  font-weight: 800;
  margin-bottom: 0.4rem;
}

.results-header p {
  color: var(--text-muted);
  font-size: 1rem;
  margin-bottom: 2rem;
}

.score-summary-grid {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 3rem;
  margin-bottom: 2.2rem;
  flex-wrap: wrap;
}

.score-circle-container {
  position: relative;
  width: 140px;
  height: 140px;
}

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

.score-bg {
  fill: none;
  stroke: rgba(255, 255, 255, 0.08);
  stroke-width: 10;
}

.score-fill {
  fill: none;
  stroke: var(--accent-primary);
  stroke-width: 10;
  stroke-dasharray: 314;
  stroke-dashoffset: 314;
  stroke-linecap: round;
  transition: stroke-dashoffset 1.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.score-text {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  text-align: center;
}

.score-text span {
  display: block;
  font-family: 'Outfit', sans-serif;
  font-size: 1.8rem;
  font-weight: 800;
  line-height: 1;
}

.score-text small {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.result-stats-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem 2rem;
  text-align: left;
}

.res-stat-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  font-size: 0.95rem;
}

.stat-label {
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.results-action-buttons {
  display: flex;
  justify-content: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.section-card {
  margin-bottom: 1.75rem;
}

.section-card h3 {
  font-family: 'Outfit', sans-serif;
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 0.3rem;
}

.section-desc {
  color: var(--text-muted);
  font-size: 0.88rem;
  margin-bottom: 1.5rem;
}

/* Mastery Grid */
.table-mastery-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
}

.mastery-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  padding: 1rem;
  border-radius: 14px;
}

.mastery-header {
  display: flex;
  justify-content: space-between;
  font-family: 'Outfit', sans-serif;
  font-weight: 700;
  font-size: 0.95rem;
  margin-bottom: 0.6rem;
}

.mastery-bar-bg {
  height: 8px;
  background: rgba(0, 0, 0, 0.2);
  border-radius: 10px;
  overflow: hidden;
  margin-bottom: 0.4rem;
}

.mastery-bar-fill {
  height: 100%;
  border-radius: 10px;
  transition: width 1s ease;
}

.mastery-sub {
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* Review List */
.review-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.25rem;
  flex-wrap: wrap;
  gap: 1rem;
}

.filter-btn-group {
  display: flex;
  gap: 0.35rem;
  background: var(--bg-secondary);
  padding: 0.3rem;
  border-radius: 10px;
  border: 1px solid var(--border-color);
}

.btn-filter {
  background: transparent;
  border: none;
  color: var(--text-muted);
}

.btn-filter.active {
  background: var(--accent-primary);
  color: #ffffff;
}

.review-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.review-item {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 14px;
  padding: 1.2rem;
}

.review-item.correct-item { border-left: 4px solid var(--success-color); }
.review-item.incorrect-item { border-left: 4px solid var(--danger-color); }
.review-item.skipped-item { border-left: 4px solid var(--warning-color); }

.review-q-title {
  font-family: 'Outfit', sans-serif;
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 0.6rem;
  display: flex;
  justify-content: space-between;
}

.review-answers-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
  font-size: 0.88rem;
  margin-top: 0.5rem;
  margin-bottom: 0.5rem;
}

/* --- TABLE CHART REFERENCE VIEW --- */
.chart-header-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
  gap: 1rem;
}

.table-selector-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.table-tab {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  padding: 0.45rem 0.8rem;
  border-radius: 8px;
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
}

.table-tab.active {
  background: var(--accent-primary);
  color: #ffffff;
  border-color: var(--accent-primary);
}

.table-grid-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
}

.table-card-single {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 1.25rem;
  transition: transform 0.25s ease;
}

.table-card-single:hover {
  transform: translateY(-4px);
  border-color: var(--accent-primary);
}

.table-card-single h4 {
  font-family: 'Outfit', sans-serif;
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 1rem;
  color: var(--accent-primary);
  text-align: center;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 0.5rem;
}

.table-rows-list {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.table-row-item {
  display: flex;
  justify-content: space-between;
  padding: 0.45rem 0.75rem;
  border-radius: 8px;
  font-size: 0.92rem;
  cursor: pointer;
  transition: background 0.15s ease;
}

.table-row-item:hover {
  background: rgba(99, 102, 241, 0.15);
  color: var(--text-main);
}

.table-row-item strong {
  font-family: 'Outfit', sans-serif;
  color: var(--accent-primary);
}

/* --- FLASHCARDS VIEW --- */
.flashcards-wrapper {
  max-width: 650px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 1.75rem;
}

.flashcard-controls-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.flashcard-3d-scene {
  perspective: 1000px;
  height: 320px;
  cursor: pointer;
}

.flashcard {
  width: 100%;
  height: 100%;
  position: relative;
  transform-style: preserve-3d;
  transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
  border-radius: 24px;
}

.flashcard.flipped {
  transform: rotateY(180deg);
}

.card-face {
  position: absolute;
  width: 100%;
  height: 100%;
  backface-visibility: hidden;
  border-radius: 24px;
  padding: 2rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: space-between;
  background: var(--bg-card);
  backdrop-filter: var(--glass-blur);
  border: 2px solid var(--border-glow);
  box-shadow: var(--shadow-lg);
}

.card-front {
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.1) 0%, rgba(139, 92, 246, 0.1) 100%), var(--bg-card);
}

.card-back {
  transform: rotateY(180deg);
  background: linear-gradient(135deg, rgba(16, 185, 129, 0.1) 0%, rgba(99, 102, 241, 0.1) 100%), var(--bg-card);
}

.card-expression {
  font-family: 'Outfit', sans-serif;
  font-size: 3rem;
  font-weight: 800;
  color: var(--text-main);
}

.card-answer-label {
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--success-color);
  letter-spacing: 1px;
}

.card-answer-value {
  font-family: 'Outfit', sans-serif;
  font-size: 3.5rem;
  font-weight: 800;
  color: var(--success-color);
  line-height: 1;
}

.card-breakdown {
  font-size: 0.92rem;
  color: var(--text-muted);
  text-align: center;
  background: rgba(0, 0, 0, 0.2);
  padding: 0.6rem 1rem;
  border-radius: 10px;
}

.card-hint {
  font-size: 0.8rem;
  color: var(--text-dim);
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.flashcard-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.flash-counter {
  font-family: 'Outfit', sans-serif;
  font-weight: 700;
  color: var(--text-muted);
}

/* --- HISTORY TABLE --- */
.history-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
}

.history-table-wrapper {
  overflow-x: auto;
}

.history-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.9rem;
}

.history-table th {
  padding: 0.85rem 1rem;
  color: var(--text-muted);
  font-weight: 600;
  border-bottom: 1px solid var(--border-color);
}

.history-table td {
  padding: 0.9rem 1rem;
  border-bottom: 1px solid var(--border-color);
  color: var(--text-main);
}

/* --- MODAL PALETTE --- */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(8px);
  z-index: 999;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  animation: fadeIn 0.25s ease;
}

.modal-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  width: 100%;
  max-width: 520px;
  box-shadow: var(--shadow-lg);
  overflow: hidden;
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.2rem 1.5rem;
  border-bottom: 1px solid var(--border-color);
}

.modal-close {
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 1.2rem;
  cursor: pointer;
}

.modal-body {
  padding: 1.5rem;
}

.legend-row {
  display: flex;
  gap: 1rem;
  margin-bottom: 1.25rem;
  font-size: 0.78rem;
  color: var(--text-muted);
  flex-wrap: wrap;
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

.dot-current { background: var(--accent-primary); }
.dot-answered { background: var(--success-color); }
.dot-flagged { background: var(--warning-color); }
.dot-unanswered { background: rgba(255, 255, 255, 0.2); }

.palette-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 0.6rem;
}

.palette-btn {
  height: 44px;
  border-radius: 10px;
  border: 1px solid var(--border-color);
  background: var(--bg-secondary);
  color: var(--text-main);
  font-family: 'Outfit', sans-serif;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.2s ease;
}

.palette-btn.current {
  border-color: var(--accent-primary);
  box-shadow: 0 0 10px var(--accent-primary);
}

.palette-btn.answered {
  background: var(--success-bg);
  border-color: var(--success-color);
  color: var(--success-color);
}

.palette-btn.flagged {
  background: var(--warning-bg);
  border-color: var(--warning-color);
  color: var(--warning-color);
}

.modal-footer {
  padding: 1rem 1.5rem;
  border-top: 1px solid var(--border-color);
  display: flex;
  justify-content: flex-end;
}

/* Helper Utilities */
.hidden { display: none !important; }
.text-success { color: var(--success-color); }
.text-danger { color: var(--danger-color); }
.text-warning { color: var(--warning-color); }

/* Footer */
.app-footer {
  text-align: center;
  padding: 1.5rem 0 0.5rem 0;
  font-size: 0.8rem;
  color: var(--text-dim);
}

/* --- Responsive Breakpoints --- */
@media (max-width: 992px) {
  .hero-banner {
    grid-template-columns: 1fr;
  }

  .hero-visual {
    display: none;
  }

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

@media (max-width: 768px) {
  .app-header {
    flex-direction: column;
    align-items: stretch;
  }

  .main-nav {
    overflow-x: auto;
    white-space: nowrap;
  }

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

  .form-group-row {
    grid-template-columns: 1fr;
  }

  .q-prompt {
    font-size: 1.5rem;
  }

  .results-action-buttons {
    flex-direction: column;
  }
}