:root {
  --bg-primary: var(--tg-theme-bg-color, #0f172a);
  --bg-secondary: var(--tg-theme-secondary-bg-color, #1e293b);
  --text-primary: var(--tg-theme-text-color, #f8fafc);
  --text-secondary: var(--tg-theme-hint-color, #94a3b8);
  --btn-color: var(--tg-theme-button-color, #059669);
  --btn-text: var(--tg-theme-button-text-color, #ffffff);
  --accent-gold: #f59e0b;
  --accent-gold-dark: #d97706;
  --accent-emerald: #10b981;
  --accent-emerald-dark: #059669;
  --accent-danger: #ef4444;
  --accent-blue: #3b82f6;
  --card-bg: rgba(30, 41, 59, 0.7);
  --card-border: rgba(255, 255, 255, 0.08);
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-tap-highlight-color: transparent;
  user-select: none;
}

body {
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-family);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  padding-bottom: env(safe-area-inset-bottom, 20px);
  overflow-x: hidden;
  transition: background-color 0.3s ease, color 0.3s ease;
}

/* Floating Network Status Toast */
.network-toast {
  position: fixed;
  top: 60px;
  left: 50%;
  transform: translateX(-50%) translateY(-20px);
  z-index: 110;
  padding: 8px 16px;
  border-radius: 24px;
  font-size: 12px;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 8px;
  opacity: 0;
  pointer-events: none;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.25);
}

.network-toast.visible {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

.network-toast.offline {
  background: rgba(217, 119, 6, 0.95);
  color: #ffffff;
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.network-toast.online {
  background: rgba(16, 185, 129, 0.95);
  color: #ffffff;
  border: 1px solid rgba(255, 255, 255, 0.2);
}

/* App Header */
.app-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--bg-primary);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--card-border);
  padding: 10px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.header-brand {
  display: flex;
  align-items: center;
  gap: 10px;
}

.brand-logo {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: linear-gradient(135deg, #059669, #d97706);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 16px;
  color: #fff;
  box-shadow: 0 4px 10px rgba(5, 150, 105, 0.35);
  flex-shrink: 0;
}

.brand-info h1 {
  font-size: 14px;
  font-weight: 700;
  line-height: 1.2;
}

.brand-info p {
  font-size: 11px;
  color: var(--text-secondary);
  max-width: 140px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* Live Timer Badge */
.timer-badge {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  border-radius: 20px;
  font-weight: 700;
  font-size: 14px;
  background: rgba(16, 185, 129, 0.15);
  border: 1px solid rgba(16, 185, 129, 0.35);
  color: var(--accent-emerald);
  transition: all 0.3s ease;
  letter-spacing: 0.5px;
}

.timer-badge.warning {
  background: rgba(217, 119, 6, 0.2);
  border-color: rgba(217, 119, 6, 0.45);
  color: var(--accent-gold);
}

.timer-badge.danger {
  background: rgba(239, 68, 68, 0.25);
  border-color: rgba(239, 68, 68, 0.6);
  color: var(--accent-danger);
  animation: pulse 1.2s infinite;
}

@keyframes pulse {
  0% { transform: scale(1); }
  50% { transform: scale(1.05); }
  100% { transform: scale(1); }
}

/* Progress Bar */
.progress-bar-container {
  height: 4px;
  background: rgba(255, 255, 255, 0.06);
  width: 100%;
}

.progress-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, #10b981, #f59e0b);
  width: 0%;
  transition: width 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Main Container */
.main-content {
  flex: 1;
  padding: 16px;
  max-width: 600px;
  margin: 0 auto;
  width: 100%;
  display: flex;
  flex-direction: column;
}

/* Question Header Card */
.question-card {
  background: var(--bg-secondary);
  border: 1px solid var(--card-border);
  border-radius: 18px;
  padding: 20px;
  margin-bottom: 18px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.18);
  position: relative;
  transition: transform 0.2s ease;
}

.question-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 14px;
}

.question-badge {
  font-size: 13px;
  font-weight: 700;
  color: var(--accent-emerald);
  background: rgba(16, 185, 129, 0.14);
  padding: 4px 10px;
  border-radius: 8px;
  letter-spacing: 0.3px;
}

.meta-right-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

/* Flag / Bookmark Button */
.btn-flag {
  background: transparent;
  border: 1px solid var(--card-border);
  border-radius: 8px;
  padding: 4px 9px;
  color: var(--text-secondary);
  font-size: 12px;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 5px;
  cursor: pointer;
  transition: all 0.2s ease;
}

.btn-flag.flagged {
  background: rgba(245, 158, 11, 0.18);
  border-color: var(--accent-gold);
  color: var(--accent-gold);
}

.status-pill {
  font-size: 12px;
  color: var(--text-secondary);
}

.question-text {
  font-size: 17px;
  line-height: 1.55;
  font-weight: 600;
  color: var(--text-primary);
  user-select: text;
}

/* Option Cards */
.options-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 24px;
}

.option-btn {
  background: var(--bg-secondary);
  border: 1.5px solid var(--card-border);
  border-radius: 16px;
  padding: 14px 16px;
  display: flex;
  align-items: center;
  gap: 14px;
  cursor: pointer;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  text-align: left;
}

.option-btn:hover {
  border-color: rgba(16, 185, 129, 0.4);
}

.option-btn:active {
  transform: scale(0.98);
}

.option-letter {
  width: 34px;
  height: 34px;
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 15px;
  font-weight: 700;
  color: var(--text-secondary);
  flex-shrink: 0;
  transition: all 0.2s ease;
}

.option-text {
  font-size: 15px;
  line-height: 1.45;
  color: var(--text-primary);
  flex: 1;
  user-select: text;
}

/* Selected Option State */
.option-btn.selected {
  background: rgba(16, 185, 129, 0.14);
  border-color: var(--accent-emerald);
  box-shadow: 0 0 14px rgba(16, 185, 129, 0.22);
}

.option-btn.selected .option-letter {
  background: var(--accent-emerald);
  border-color: var(--accent-emerald);
  color: #ffffff;
}

/* Bottom Navigation Controls */
.bottom-controls {
  position: sticky;
  bottom: 0;
  background: var(--bg-primary);
  border-top: 1px solid var(--card-border);
  padding: 10px 14px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  z-index: 40;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 5px;
  padding: 11px 14px;
  border-radius: 12px;
  font-weight: 600;
  font-size: 13px;
  cursor: pointer;
  border: none;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  white-space: nowrap;
}

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

.btn-primary {
  background: var(--btn-color);
  color: var(--btn-text);
  box-shadow: 0 4px 12px rgba(5, 150, 105, 0.35);
}

.btn-accent {
  background: linear-gradient(135deg, #d97706, #b45309);
  color: #fff;
  box-shadow: 0 4px 12px rgba(217, 119, 6, 0.35);
}

.btn:disabled {
  opacity: 0.35;
  cursor: not-allowed;
  box-shadow: none;
}

/* Question Matrix / Grid Modal */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  z-index: 100;
  display: none;
  align-items: flex-end;
  justify-content: center;
}

.modal-overlay.active {
  display: flex;
}

.modal-card {
  background: var(--bg-primary);
  border-top-left-radius: 24px;
  border-top-right-radius: 24px;
  border-top: 1px solid var(--card-border);
  padding: 22px 18px;
  width: 100%;
  max-width: 600px;
  max-height: 82vh;
  display: flex;
  flex-direction: column;
  animation: slideUp 0.24s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes slideUp {
  from { transform: translateY(100%); }
  to { transform: translateY(0); }
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 14px;
}

.modal-header h3 {
  font-size: 17px;
  font-weight: 700;
}

/* Filter Tabs */
.filter-tabs {
  display: flex;
  gap: 8px;
  margin-bottom: 12px;
}

.filter-tab {
  flex: 1;
  padding: 8px 10px;
  border-radius: 10px;
  background: var(--bg-secondary);
  border: 1px solid var(--card-border);
  font-size: 12px;
  font-weight: 600;
  color: var(--text-secondary);
  text-align: center;
  cursor: pointer;
  transition: all 0.2s ease;
}

.filter-tab.active {
  background: rgba(16, 185, 129, 0.16);
  border-color: var(--accent-emerald);
  color: var(--accent-emerald);
}

.grid-legend {
  display: flex;
  justify-content: space-around;
  font-size: 11px;
  color: var(--text-secondary);
  margin-bottom: 14px;
  background: var(--bg-secondary);
  padding: 8px;
  border-radius: 10px;
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 5px;
}

.legend-dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
}

.legend-dot.answered { background: var(--accent-emerald); }
.legend-dot.unanswered { background: rgba(255, 255, 255, 0.2); }
.legend-dot.current { background: var(--accent-blue); }
.legend-dot.flagged { background: var(--accent-gold); }

.question-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 8px;
  overflow-y: auto;
  padding: 4px;
  margin-bottom: 16px;
  max-height: 44vh;
}

.grid-cell {
  aspect-ratio: 1;
  border-radius: 10px;
  background: var(--bg-secondary);
  border: 1px solid var(--card-border);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 13px;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.15s ease;
  position: relative;
}

.grid-cell.answered {
  background: rgba(16, 185, 129, 0.18);
  border-color: var(--accent-emerald);
  color: var(--accent-emerald);
}

.grid-cell.current {
  border-color: var(--accent-blue);
  color: #ffffff;
  box-shadow: 0 0 10px rgba(59, 130, 246, 0.4);
}

.grid-cell.flagged-marker::after {
  content: "🚩";
  position: absolute;
  top: 2px;
  right: 2px;
  font-size: 8px;
}

/* Spinner */
.spinner {
  width: 40px;
  height: 40px;
  border: 3px solid rgba(255, 255, 255, 0.1);
  border-top-color: var(--accent-emerald);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin: 30px auto;
}

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

/* Center Status Views */
.status-screen {
  text-align: center;
  padding: 40px 20px;
  max-width: 440px;
  margin: auto;
}

.status-screen h2 {
  font-size: 22px;
  margin: 16px 0 8px;
}

.status-screen p {
  color: var(--text-secondary);
  font-size: 14px;
  line-height: 1.5;
  margin-bottom: 24px;
}

.score-box {
  background: var(--bg-secondary);
  border: 1px solid var(--card-border);
  border-radius: 18px;
  padding: 24px;
  margin: 20px 0;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
}

.score-number {
  font-size: 46px;
  font-weight: 800;
  color: var(--accent-emerald);
  line-height: 1;
  margin-bottom: 6px;
}