/* ===== TDVN Quiz - Premium Dark Theme ===== */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&display=swap');

/* ===== CSS Variables ===== */
:root {
  --bg-primary: #0a0a1a;
  --bg-secondary: #111128;
  --bg-card: rgba(255, 255, 255, 0.04);
  --bg-card-hover: rgba(255, 255, 255, 0.08);
  --bg-glass: rgba(255, 255, 255, 0.06);
  --border-glass: rgba(255, 255, 255, 0.08);
  --border-glass-hover: rgba(255, 255, 255, 0.15);

  --primary: #6366f1;
  --primary-light: #818cf8;
  --primary-dark: #4f46e5;
  --accent: #8b5cf6;
  --accent-light: #a78bfa;

  --success: #10b981;
  --success-light: #34d399;
  --success-bg: rgba(16, 185, 129, 0.1);
  --error: #ef4444;
  --error-light: #f87171;
  --error-bg: rgba(239, 68, 68, 0.1);
  --warning: #f59e0b;
  --warning-bg: rgba(245, 158, 11, 0.1);
  --info: #3b82f6;

  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --text-dim: #475569;

  --gradient-primary: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #a855f7 100%);
  --gradient-success: linear-gradient(135deg, #10b981 0%, #34d399 100%);
  --gradient-error: linear-gradient(135deg, #ef4444 0%, #f87171 100%);
  --gradient-bg: radial-gradient(ellipse at 20% 50%, rgba(99, 102, 241, 0.08) 0%, transparent 50%),
                 radial-gradient(ellipse at 80% 20%, rgba(139, 92, 246, 0.06) 0%, transparent 50%),
                 radial-gradient(ellipse at 50% 80%, rgba(168, 85, 247, 0.04) 0%, transparent 50%);

  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 20px rgba(99, 102, 241, 0.15);
  --shadow-glow-success: 0 0 20px rgba(16, 185, 129, 0.15);
  --shadow-glow-error: 0 0 20px rgba(239, 68, 68, 0.15);

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  --transition-fast: 0.15s ease;
  --transition-normal: 0.25s ease;
  --transition-slow: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--gradient-bg);
  pointer-events: none;
  z-index: 0;
}

/* ===== Scrollbar ===== */
::-webkit-scrollbar {
  width: 6px;
}
::-webkit-scrollbar-track {
  background: transparent;
}
::-webkit-scrollbar-thumb {
  background: rgba(99, 102, 241, 0.3);
  border-radius: var(--radius-full);
}
::-webkit-scrollbar-thumb:hover {
  background: rgba(99, 102, 241, 0.5);
}

/* ===== Layout ===== */
.app-container {
  position: relative;
  z-index: 1;
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem 1.5rem;
  min-height: 100vh;
}

/* ===== Header ===== */
.app-header {
  text-align: center;
  margin-bottom: 2rem;
  animation: fadeInDown 0.6s ease;
}

.app-logo {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.5rem;
}

.app-logo-icon {
  width: 48px;
  height: 48px;
  background: var(--gradient-primary);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  box-shadow: var(--shadow-glow);
}

.app-logo h1 {
  font-size: 1.75rem;
  font-weight: 800;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: -0.5px;
}

.app-subtitle {
  color: var(--text-secondary);
  font-size: 0.875rem;
  font-weight: 400;
}

/* ===== Views ===== */
.view {
  display: none;
  animation: fadeIn 0.4s ease;
}

.view.active {
  display: block;
}

/* ===== Glass Card ===== */
.glass-card {
  background: var(--bg-glass);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: var(--shadow-md);
  transition: all var(--transition-normal);
}

.glass-card:hover {
  border-color: var(--border-glass-hover);
  box-shadow: var(--shadow-lg);
}

.glass-card-compact {
  padding: 1.5rem;
}

/* ===== Login Form ===== */
.login-container {
  max-width: 480px;
  margin: 3rem auto;
}

.login-card {
  composes: glass-card;
}

.login-header {
  text-align: center;
  margin-bottom: 2rem;
}

.login-header .icon-circle {
  width: 72px;
  height: 72px;
  background: var(--gradient-primary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 1rem;
  font-size: 2rem;
  box-shadow: var(--shadow-glow);
  animation: pulse-glow 2s infinite;
}

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

.login-header p {
  color: var(--text-secondary);
  font-size: 0.875rem;
}

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

.form-label {
  display: block;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 0.5rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.form-input {
  width: 100%;
  padding: 0.875rem 1rem;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-family: inherit;
  font-size: 0.9375rem;
  transition: all var(--transition-normal);
  outline: none;
}

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

.form-input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.15);
  background: rgba(99, 102, 241, 0.04);
}

.form-input:hover:not(:focus) {
  border-color: rgba(255, 255, 255, 0.15);
}

.form-error {
  color: var(--error);
  font-size: 0.8125rem;
  margin-top: 0.375rem;
  display: none;
}

.form-error.show {
  display: block;
  animation: shake 0.3s ease;
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.875rem 1.5rem;
  border: none;
  border-radius: var(--radius-md);
  font-family: inherit;
  font-size: 0.9375rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-normal);
  outline: none;
  text-decoration: none;
  white-space: nowrap;
}

.btn-primary {
  background: var(--gradient-primary);
  color: white;
  box-shadow: var(--shadow-glow);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 30px rgba(99, 102, 241, 0.25), var(--shadow-md);
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.06);
  color: var(--text-primary);
  border: 1px solid var(--border-glass);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: var(--border-glass-hover);
}

.btn-success {
  background: var(--gradient-success);
  color: white;
  box-shadow: var(--shadow-glow-success);
}

.btn-success:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 30px rgba(16, 185, 129, 0.25), var(--shadow-md);
}

.btn-danger {
  background: var(--gradient-error);
  color: white;
}

.btn-danger:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 30px rgba(239, 68, 68, 0.25), var(--shadow-md);
}

.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
  padding: 0.5rem 1rem;
}

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

.btn-block {
  width: 100%;
}

.btn-sm {
  padding: 0.5rem 1rem;
  font-size: 0.8125rem;
}

.btn-lg {
  padding: 1rem 2rem;
  font-size: 1rem;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none !important;
}

/* ===== Role Selector ===== */
.role-selector {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  max-width: 600px;
  margin: 4rem auto;
}

.role-card {
  background: var(--bg-glass);
  backdrop-filter: blur(20px);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-xl);
  padding: 2.5rem 2rem;
  text-align: center;
  cursor: pointer;
  transition: all var(--transition-slow);
  position: relative;
  overflow: hidden;
}

.role-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-primary);
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.role-card:hover {
  border-color: var(--primary);
  transform: translateY(-4px);
  box-shadow: var(--shadow-glow), var(--shadow-lg);
}

.role-card:hover::before {
  opacity: 1;
}

.role-card .icon-circle {
  width: 64px;
  height: 64px;
  background: var(--gradient-primary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 1.25rem;
  font-size: 1.75rem;
  box-shadow: var(--shadow-glow);
}

.role-card h3 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.role-card p {
  color: var(--text-secondary);
  font-size: 0.8125rem;
  line-height: 1.5;
}

/* ===== Quiz Progress ===== */
.quiz-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
  gap: 1rem;
}

.quiz-info {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.quiz-counter {
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.quiz-counter span {
  color: var(--primary-light);
  font-weight: 700;
  font-size: 1.125rem;
}

.quiz-timer {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.875rem;
  color: var(--text-secondary);
  background: rgba(255, 255, 255, 0.04);
  padding: 0.5rem 1rem;
  border-radius: var(--radius-full);
  border: 1px solid var(--border-glass);
}

.quiz-timer .timer-icon {
  font-size: 1rem;
}

.quiz-timer .timer-value {
  font-weight: 600;
  color: var(--text-primary);
  font-variant-numeric: tabular-nums;
}

.progress-bar-container {
  width: 100%;
  height: 6px;
  background: rgba(255, 255, 255, 0.06);
  border-radius: var(--radius-full);
  margin-bottom: 2rem;
  overflow: hidden;
}

.progress-bar {
  height: 100%;
  background: var(--gradient-primary);
  border-radius: var(--radius-full);
  transition: width 0.5s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
}

.progress-bar::after {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  width: 20px;
  height: 100%;
  background: rgba(255, 255, 255, 0.3);
  border-radius: var(--radius-full);
  filter: blur(4px);
}

/* ===== Question Card ===== */
.question-card {
  max-width: 800px;
  margin: 0 auto;
}

.question-category {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  padding: 0.375rem 0.875rem;
  background: rgba(99, 102, 241, 0.1);
  border: 1px solid rgba(99, 102, 241, 0.2);
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--primary-light);
  margin-bottom: 1.25rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.question-text {
  font-size: 1.1875rem;
  font-weight: 600;
  line-height: 1.6;
  margin-bottom: 2rem;
  color: var(--text-primary);
}

.options-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.option-btn {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  width: 100%;
  padding: 1.125rem 1.25rem;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-normal);
  text-align: left;
  font-family: inherit;
  font-size: 0.9375rem;
  color: var(--text-primary);
  line-height: 1.5;
  outline: none;
}

.option-btn:hover:not(.selected):not(.correct):not(.wrong) {
  border-color: var(--primary);
  background: rgba(99, 102, 241, 0.06);
  transform: translateX(4px);
}

.option-label {
  flex-shrink: 0;
  width: 32px;
  height: 32px;
  background: rgba(255, 255, 255, 0.06);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.8125rem;
  color: var(--text-secondary);
  transition: all var(--transition-normal);
}

.option-btn:hover:not(.selected):not(.correct):not(.wrong) .option-label {
  background: rgba(99, 102, 241, 0.2);
  color: var(--primary-light);
}

.option-btn.selected {
  border-color: var(--primary);
  background: rgba(99, 102, 241, 0.1);
}

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

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

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

.option-btn.wrong {
  border-color: var(--error);
  background: var(--error-bg);
}

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

.option-btn.disabled {
  pointer-events: none;
}

/* ===== Quiz Navigation ===== */
.quiz-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 2rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border-glass);
}

/* ===== Result View ===== */
.result-container {
  max-width: 800px;
  margin: 0 auto;
}

.result-header {
  text-align: center;
  margin-bottom: 2.5rem;
}

.result-score-circle {
  width: 160px;
  height: 160px;
  border-radius: 50%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  margin: 0 auto 1.5rem;
  position: relative;
}

.result-score-circle::before {
  content: '';
  position: absolute;
  inset: -4px;
  border-radius: 50%;
  padding: 4px;
  background: var(--gradient-primary);
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
}

.result-score-circle.pass {
  background: rgba(16, 185, 129, 0.1);
}

.result-score-circle.pass::before {
  background: var(--gradient-success);
}

.result-score-circle.fail {
  background: rgba(239, 68, 68, 0.1);
}

.result-score-circle.fail::before {
  background: var(--gradient-error);
}

.score-number {
  font-size: 3rem;
  font-weight: 900;
  line-height: 1;
}

.score-label {
  font-size: 0.75rem;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-top: 0.25rem;
}

.result-status {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.result-status.pass {
  color: var(--success);
}

.result-status.fail {
  color: var(--error);
}

.result-meta {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 2rem;
  color: var(--text-secondary);
  font-size: 0.875rem;
  flex-wrap: wrap;
}

.result-meta-item {
  display: flex;
  align-items: center;
  gap: 0.375rem;
}

.result-detail-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-top: 2rem;
}

.result-detail-item {
  background: var(--bg-glass);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  transition: all var(--transition-normal);
}

.result-detail-item:hover {
  border-color: var(--border-glass-hover);
}

.result-detail-item.correct {
  border-left: 3px solid var(--success);
}

.result-detail-item.wrong {
  border-left: 3px solid var(--error);
}

.result-q-header {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  margin-bottom: 0.75rem;
}

.result-q-number {
  flex-shrink: 0;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 700;
}

.result-detail-item.correct .result-q-number {
  background: var(--success-bg);
  color: var(--success);
}

.result-detail-item.wrong .result-q-number {
  background: var(--error-bg);
  color: var(--error);
}

.result-q-text {
  font-size: 0.9375rem;
  font-weight: 500;
  line-height: 1.5;
}

.result-answer {
  font-size: 0.8125rem;
  color: var(--text-secondary);
  margin-top: 0.25rem;
}

.result-answer strong {
  color: var(--success);
}

.result-answer .wrong-answer {
  color: var(--error);
}

.result-actions {
  display: flex;
  gap: 1rem;
  justify-content: center;
  margin-top: 2rem;
  flex-wrap: wrap;
}

/* ===== Admin Dashboard ===== */
.admin-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 2rem;
  flex-wrap: wrap;
  gap: 1rem;
}

.admin-title {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.admin-title h2 {
  font-size: 1.5rem;
  font-weight: 700;
}

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

/* Stats Cards */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
  margin-bottom: 2rem;
}

.stat-card {
  background: var(--bg-glass);
  backdrop-filter: blur(20px);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.stat-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
}

.stat-card:nth-child(1)::before { background: var(--gradient-primary); }
.stat-card:nth-child(2)::before { background: var(--gradient-success); }
.stat-card:nth-child(3)::before { background: linear-gradient(135deg, #f59e0b, #fbbf24); }
.stat-card:nth-child(4)::before { background: linear-gradient(135deg, #3b82f6, #60a5fa); }

.stat-card:hover {
  transform: translateY(-2px);
  border-color: var(--border-glass-hover);
  box-shadow: var(--shadow-md);
}

.stat-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  margin-bottom: 1rem;
}

.stat-card:nth-child(1) .stat-icon { background: rgba(99, 102, 241, 0.15); }
.stat-card:nth-child(2) .stat-icon { background: rgba(16, 185, 129, 0.15); }
.stat-card:nth-child(3) .stat-icon { background: rgba(245, 158, 11, 0.15); }
.stat-card:nth-child(4) .stat-icon { background: rgba(59, 130, 246, 0.15); }

.stat-value {
  font-size: 2rem;
  font-weight: 800;
  line-height: 1;
  margin-bottom: 0.375rem;
}

.stat-label {
  font-size: 0.8125rem;
  color: var(--text-secondary);
  font-weight: 500;
}

/* Table */
.table-container {
  background: var(--bg-glass);
  backdrop-filter: blur(20px);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.table-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--border-glass);
  flex-wrap: wrap;
  gap: 1rem;
}

.table-title {
  font-size: 1rem;
  font-weight: 600;
}

.table-search {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  padding: 0.5rem 0.875rem;
  transition: all var(--transition-normal);
}

.table-search:focus-within {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.table-search input {
  background: none;
  border: none;
  color: var(--text-primary);
  font-family: inherit;
  font-size: 0.875rem;
  outline: none;
  width: 200px;
}

.table-search input::placeholder {
  color: var(--text-dim);
}

.data-table {
  width: 100%;
  border-collapse: collapse;
}

.data-table thead {
  background: rgba(255, 255, 255, 0.02);
}

.data-table th {
  padding: 0.875rem 1.25rem;
  text-align: left;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  border-bottom: 1px solid var(--border-glass);
}

.data-table td {
  padding: 1rem 1.25rem;
  font-size: 0.875rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.03);
  color: var(--text-secondary);
}

.data-table tbody tr {
  transition: background var(--transition-fast);
}

.data-table tbody tr:hover {
  background: rgba(255, 255, 255, 0.03);
}

.data-table tbody tr:last-child td {
  border-bottom: none;
}

.td-name {
  color: var(--text-primary) !important;
  font-weight: 500;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  padding: 0.25rem 0.625rem;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 600;
}

.badge-success {
  background: var(--success-bg);
  color: var(--success);
}

.badge-error {
  background: var(--error-bg);
  color: var(--error);
}

.badge-warning {
  background: var(--warning-bg);
  color: var(--warning);
}

.table-empty {
  text-align: center;
  padding: 3rem 1rem;
  color: var(--text-muted);
}

.table-empty .empty-icon {
  font-size: 3rem;
  margin-bottom: 1rem;
  opacity: 0.5;
}

.table-empty p {
  font-size: 0.9375rem;
}

/* ===== Modal ===== */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: 1rem;
  animation: fadeIn 0.2s ease;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal);
}

.modal-overlay.active {
  opacity: 1;
  visibility: visible;
}

.modal {
  background: var(--bg-secondary);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-xl);
  width: 100%;
  max-width: 700px;
  max-height: 80vh;
  overflow-y: auto;
  box-shadow: var(--shadow-lg);
  transform: translateY(20px);
  transition: transform var(--transition-slow);
}

.modal-overlay.active .modal {
  transform: translateY(0);
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.5rem;
  border-bottom: 1px solid var(--border-glass);
  position: sticky;
  top: 0;
  background: var(--bg-secondary);
  z-index: 1;
}

.modal-header h3 {
  font-size: 1.125rem;
  font-weight: 700;
}

.modal-close {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255, 255, 255, 0.06);
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  font-size: 1.125rem;
  transition: all var(--transition-fast);
}

.modal-close:hover {
  background: rgba(255, 255, 255, 0.1);
  color: var(--text-primary);
}

.modal-body {
  padding: 1.5rem;
}

/* ===== Confirm Dialog ===== */
.confirm-content {
  text-align: center;
  padding: 1rem 0;
}

.confirm-icon {
  font-size: 3rem;
  margin-bottom: 1rem;
}

.confirm-content h3 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.confirm-content p {
  color: var(--text-secondary);
  font-size: 0.9375rem;
  margin-bottom: 1.5rem;
}

.confirm-actions {
  display: flex;
  gap: 1rem;
  justify-content: center;
}

/* ===== Notification Toast ===== */
.toast-container {
  position: fixed;
  top: 1.5rem;
  right: 1.5rem;
  z-index: 2000;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.toast {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 1rem 1.25rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  animation: slideInRight 0.3s ease;
  min-width: 300px;
}

.toast.success {
  border-left: 3px solid var(--success);
}

.toast.error {
  border-left: 3px solid var(--error);
}

.toast.info {
  border-left: 3px solid var(--info);
}

.toast-icon {
  font-size: 1.25rem;
  flex-shrink: 0;
}

.toast-message {
  font-size: 0.875rem;
  color: var(--text-primary);
  flex: 1;
}

.toast-close {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 1rem;
  padding: 0.25rem;
  transition: color var(--transition-fast);
}

.toast-close:hover {
  color: var(--text-primary);
}

/* ===== Animations ===== */
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

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

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slideInRight {
  from {
    opacity: 0;
    transform: translateX(100%);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-6px); }
  75% { transform: translateX(6px); }
}

@keyframes pulse-glow {
  0%, 100% { box-shadow: 0 0 20px rgba(99, 102, 241, 0.2); }
  50% { box-shadow: 0 0 30px rgba(99, 102, 241, 0.4); }
}

@keyframes count-up {
  from { opacity: 0; transform: scale(0.5); }
  to { opacity: 1; transform: scale(1); }
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
  .app-container {
    padding: 1rem;
  }

  .role-selector {
    grid-template-columns: 1fr;
    margin: 2rem auto;
  }

  .role-card {
    padding: 2rem 1.5rem;
  }

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

  .glass-card {
    padding: 1.5rem;
  }

  .quiz-header {
    flex-direction: column;
    align-items: flex-start;
  }

  .result-meta {
    flex-direction: column;
    gap: 0.5rem;
  }

  .data-table th, .data-table td {
    padding: 0.75rem 0.875rem;
    font-size: 0.8125rem;
  }

  .table-search input {
    width: 150px;
  }

  .admin-header {
    flex-direction: column;
    align-items: flex-start;
  }

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

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

  .modal {
    max-height: 90vh;
  }

  .table-responsive {
    overflow-x: auto;
  }
}

@media (max-width: 480px) {
  .stats-grid {
    grid-template-columns: 1fr;
  }

  .result-score-circle {
    width: 130px;
    height: 130px;
  }

  .score-number {
    font-size: 2.5rem;
  }

  .app-logo h1 {
    font-size: 1.25rem;
  }
}

/* ===== Utility ===== */
.text-center { text-align: center; }
.text-success { color: var(--success); }
.text-error { color: var(--error); }
.text-muted { color: var(--text-muted); }
.text-secondary { color: var(--text-secondary); }
.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.gap-1 { gap: 0.5rem; }
.flex { display: flex; }
.flex-wrap { flex-wrap: wrap; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.hidden { display: none !important; }