:root {
  /* Brazilian Traffic Theme: Deep Slate, Asphalt Black, Road Gold & Signal Emerald */
  --bg: #070B12;
  --bg-gradient: radial-gradient(circle at 50% 15%, #0F172A 0%, #070B12 100%);
  --surface: #0E1626;
  --surface-hover: #152238;
  --surface-border: #1E2D4A;
  --surface-border-subtle: rgba(255, 255, 255, 0.08);

  /* Primary Brazilian Accents */
  --brazil-green: #10B981;
  --brazil-green-glow: rgba(16, 185, 129, 0.35);
  --brazil-yellow: #F59E0B;
  --brazil-yellow-glow: rgba(245, 158, 11, 0.35);
  --brazil-blue: #2563EB;
  --brazil-blue-glow: rgba(37, 99, 235, 0.35);

  --accent: #10B981; /* Signal Green default */
  --accent-gold: #F59E0B; /* Caution Yellow */
  --accent-glow: rgba(16, 185, 129, 0.35);

  --success: #10B981;
  --success-glow: rgba(16, 185, 129, 0.3);
  --danger: #EF4444;
  --danger-glow: rgba(239, 68, 68, 0.3);
  --warning: #F59E0B;

  --text: #F9FAFB;
  --text-muted: #94A3B8;
  --text-subtle: #475569;

  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-pill: 9999px;

  --font: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Inter", "Segoe UI", Roboto, sans-serif;
  --nav-height: 62px;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-tap-highlight-color: transparent;
  font-family: var(--font);
}

body {
  background: var(--bg-gradient);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: stretch;
  overflow-x: hidden;
  user-select: none;
  -webkit-font-smoothing: antialiased;
}

/* App Shell with Dynamic Ambient Traffic Backgrounds */
.app-shell {
  width: 100%;
  max-width: 440px;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  position: relative;
  background: var(--bg);
  box-shadow: 0 0 60px rgba(0, 0, 0, 0.85);
  overflow: hidden;
}

/* Ambient Illustration Overlays */
.app-shell::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 480px;
  background: url('../assets/illustrations/bg-city-highway.svg') top center / cover no-repeat;
  pointer-events: none;
  z-index: 1;
  opacity: 0.7;
}

/* Header */
.top-nav {
  height: 60px;
  padding: 0 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(7, 11, 18, 0.88);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border-bottom: 1px solid var(--surface-border-subtle);
}

.brand {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 800;
  font-size: 1.12rem;
  letter-spacing: -0.3px;
  color: #FFFFFF;
  cursor: pointer;
}

.brand-dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--brazil-green);
  box-shadow: 0 0 10px var(--brazil-green);
}

.header-status {
  display: flex;
  align-items: center;
  gap: 8px;
}

.xp-pill {
  display: flex;
  align-items: center;
  gap: 4px;
  background: rgba(16, 185, 129, 0.15);
  border: 1px solid rgba(16, 185, 129, 0.35);
  padding: 4px 10px;
  border-radius: var(--radius-pill);
  font-size: 0.78rem;
  font-weight: 800;
  color: #34D399;
}

.streak-pill {
  display: flex;
  align-items: center;
  gap: 4px;
  background: rgba(245, 158, 11, 0.15);
  border: 1px solid rgba(245, 158, 11, 0.35);
  padding: 4px 10px;
  border-radius: var(--radius-pill);
  font-size: 0.78rem;
  font-weight: 800;
  color: #FBBF24;
}

/* Bottom Nav */
.bottom-nav {
  position: fixed;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 100%;
  max-width: 440px;
  height: calc(var(--nav-height) + env(safe-area-inset-bottom, 10px));
  padding-bottom: env(safe-area-inset-bottom, 10px);
  background: rgba(14, 22, 38, 0.94);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  display: flex;
  align-items: center;
  justify-content: space-around;
  border-top: 1px solid var(--surface-border-subtle);
  z-index: 100;
}

.nav-tab {
  background: none;
  border: none;
  color: var(--text-muted);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3px;
  font-size: 0.7rem;
  font-weight: 700;
  cursor: pointer;
  padding: 6px 14px;
  border-radius: 12px;
  transition: all 0.2s ease;
}

.nav-tab svg {
  width: 20px;
  height: 20px;
  transition: transform 0.2s ease;
}

.nav-tab.active {
  color: var(--brazil-green);
}

.nav-tab.active svg {
  transform: translateY(-2px);
}

/* Main Views Container */
.main-content {
  flex: 1;
  padding: 16px 16px calc(var(--nav-height) + env(safe-area-inset-bottom, 16px) + 20px) 16px;
  display: flex;
  flex-direction: column;
  position: relative;
  z-index: 2;
}

.view {
  display: none;
  animation: viewSlide 0.25s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

.view.active {
  display: flex;
  flex-direction: column;
  flex: 1;
}

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

/* Resume Banner */
.resume-card {
  background: linear-gradient(135deg, rgba(16, 185, 129, 0.18) 0%, rgba(245, 158, 11, 0.1) 100%);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(16, 185, 129, 0.4);
  border-radius: var(--radius-lg);
  padding: 14px 18px;
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.resume-info h4 {
  font-size: 0.92rem;
  font-weight: 800;
  color: #FFFFFF;
}

.resume-info p {
  font-size: 0.75rem;
  color: #A7F3D0;
  margin-top: 2px;
}

.btn-resume {
  background: var(--brazil-green);
  color: #070B12;
  border: none;
  padding: 7px 15px;
  border-radius: var(--radius-pill);
  font-size: 0.8rem;
  font-weight: 800;
  cursor: pointer;
  box-shadow: 0 4px 12px var(--brazil-green-glow);
  white-space: nowrap;
}

/* Level & Progress Header */
.level-banner {
  background: rgba(14, 22, 38, 0.88);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-lg);
  padding: 16px;
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 14px;
}

.level-badge {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: linear-gradient(135deg, #10B981, #059669);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  font-weight: 900;
  box-shadow: 0 4px 16px rgba(16, 185, 129, 0.4);
  flex-shrink: 0;
  color: #FFFFFF;
}

.level-meta {
  flex: 1;
}

.level-title {
  display: flex;
  justify-content: space-between;
  font-size: 0.88rem;
  font-weight: 800;
  margin-bottom: 6px;
}

.xp-bar {
  height: 6px;
  background: rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-pill);
  overflow: hidden;
}

.xp-fill {
  height: 100%;
  background: linear-gradient(90deg, #10B981, #F59E0B);
  border-radius: var(--radius-pill);
  width: 0%;
  transition: width 0.3s ease;
}

/* Config Selector (10, 20, 30 Questões) */
.setup-box {
  background: rgba(14, 22, 38, 0.88);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-lg);
  padding: 18px;
  margin-bottom: 20px;
}

.setup-label {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  color: var(--text-muted);
  font-weight: 800;
  margin-bottom: 12px;
}

.selector-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  margin-bottom: 16px;
}

.selector-btn {
  background: var(--surface-hover);
  border: 1.5px solid transparent;
  padding: 12px 8px;
  border-radius: var(--radius-md);
  color: var(--text-muted);
  font-size: 0.95rem;
  font-weight: 800;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3px;
  transition: all 0.2s ease;
}

.selector-btn span {
  font-size: 0.68rem;
  font-weight: 600;
  opacity: 0.7;
}

.selector-btn.active {
  background: rgba(16, 185, 129, 0.16);
  border-color: var(--brazil-green);
  color: #FFFFFF;
}

.selector-btn.active span {
  color: #34D399;
  opacity: 1;
}

/* Big Button (Green to Gold Gradient) */
.btn-play-primary {
  width: 100%;
  padding: 15px;
  background: linear-gradient(135deg, #10B981 0%, #059669 100%);
  color: #FFFFFF;
  border: none;
  border-radius: var(--radius-md);
  font-size: 1rem;
  font-weight: 800;
  cursor: pointer;
  box-shadow: 0 6px 20px var(--brazil-green-glow);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  transition: transform 0.15s ease;
}

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

/* Modes Grid */
.modes-title {
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  color: var(--text-muted);
  font-weight: 800;
  margin-bottom: 12px;
  display: flex;
  justify-content: space-between;
}

.modes-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-bottom: 20px;
}

.mode-card {
  background: rgba(14, 22, 38, 0.88);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-md);
  padding: 15px;
  cursor: pointer;
  transition: all 0.2s ease;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  min-height: 100px;
}

.mode-card:hover {
  background: var(--surface-hover);
  border-color: rgba(255, 255, 255, 0.15);
}

.mode-card:active {
  transform: scale(0.97);
}

.mode-card-icon {
  font-size: 1.4rem;
  margin-bottom: 8px;
}

.mode-card-name {
  font-size: 0.9rem;
  font-weight: 800;
  color: #FFFFFF;
}

.mode-card-desc {
  font-size: 0.72rem;
  color: var(--text-muted);
  margin-top: 2px;
}

/* Quiz Screen (Ambient Road Overpass / Intersection) */
#view-quiz {
  position: relative;
}

#view-quiz::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url('../assets/illustrations/bg-intersection.svg') center center / cover no-repeat;
  pointer-events: none;
  z-index: 0;
  opacity: 0.55;
}

.quiz-top, .q-box, .answers-stack, .feedback-box {
  position: relative;
  z-index: 2;
}

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

.btn-close-quiz {
  background: rgba(14, 22, 38, 0.88);
  backdrop-filter: blur(12px);
  border: 1px solid var(--surface-border);
  color: var(--text-muted);
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 1rem;
}

.bar-container {
  flex: 1;
  height: 8px;
  background: rgba(14, 22, 38, 0.8);
  border-radius: var(--radius-pill);
  margin: 0 10px;
  overflow: hidden;
  border: 1px solid var(--surface-border-subtle);
}

.bar-fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, #10B981, #F59E0B);
  border-radius: var(--radius-pill);
  transition: width 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

/* Timer Pill */
.timer-pill {
  display: flex;
  align-items: center;
  gap: 5px;
  background: rgba(245, 158, 11, 0.15);
  border: 1px solid rgba(245, 158, 11, 0.3);
  padding: 4px 9px;
  border-radius: var(--radius-pill);
  font-size: 0.78rem;
  font-weight: 800;
  color: #FBBF24;
}

.quiz-counter {
  font-size: 0.8rem;
  font-weight: 800;
  color: var(--text-muted);
}

/* Question Box */
.q-box {
  background: rgba(14, 22, 38, 0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-lg);
  padding: 20px 18px;
  margin-bottom: 16px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
}

.q-badges {
  display: flex;
  gap: 6px;
  margin-bottom: 12px;
}

.badge-tag {
  font-size: 0.68rem;
  font-weight: 800;
  padding: 3px 8px;
  border-radius: var(--radius-pill);
}

.badge-trap {
  background: rgba(239, 68, 68, 0.15);
  color: #F87171;
  border: 1px solid rgba(239, 68, 68, 0.3);
}

.badge-freq {
  background: rgba(245, 158, 11, 0.15);
  color: #FBBF24;
  border: 1px solid rgba(245, 158, 11, 0.3);
}

.badge-module {
  background: rgba(255, 255, 255, 0.08);
  color: var(--text-muted);
}

.q-plate-wrapper {
  text-align: center;
  margin-bottom: 14px;
  padding: 10px;
  background: rgba(0, 0, 0, 0.45);
  border-radius: var(--radius-md);
}

.q-plate-img {
  max-width: 110px;
  max-height: 110px;
  object-fit: contain;
  filter: drop-shadow(0 4px 14px rgba(0,0,0,0.5));
}

.q-text {
  font-size: 1.05rem;
  font-weight: 700;
  line-height: 1.48;
  color: #FFFFFF;
}

/* Alternatives Options */
.answers-stack {
  display: flex;
  flex-direction: column;
  gap: 9px;
  margin-bottom: 16px;
}

.answer-card {
  background: rgba(14, 22, 38, 0.9);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1.5px solid var(--surface-border);
  border-radius: var(--radius-md);
  padding: 14px 16px;
  display: flex;
  align-items: flex-start;
  gap: 12px;
  cursor: pointer;
  transition: all 0.15s ease;
  text-align: left;
  color: var(--text);
  font-size: 0.94rem;
  line-height: 1.4;
}

.answer-card:hover:not(:disabled) {
  background: var(--surface-hover);
  border-color: rgba(255, 255, 255, 0.18);
}

.answer-card:active:not(:disabled) {
  transform: scale(0.98);
}

.ans-letter {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.08);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.78rem;
  font-weight: 800;
  color: var(--text-muted);
  flex-shrink: 0;
  margin-top: 1px;
}

.answer-card.correct {
  background: rgba(16, 185, 129, 0.2) !important;
  border-color: var(--brazil-green) !important;
  box-shadow: 0 0 20px var(--brazil-green-glow);
}

.answer-card.correct .ans-letter {
  background: var(--brazil-green);
  color: #070B12;
}

.answer-card.wrong {
  background: rgba(239, 68, 68, 0.18) !important;
  border-color: var(--danger) !important;
  box-shadow: 0 0 20px var(--danger-glow);
  animation: shake 0.35s ease;
}

.answer-card.wrong .ans-letter {
  background: var(--danger);
  color: #FFFFFF;
}

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  20%, 60% { transform: translateX(-6px); }
  40%, 80% { transform: translateX(6px); }
}

/* Feedback Drawer */
.feedback-box {
  background: rgba(14, 22, 38, 0.96);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-lg);
  padding: 16px 18px;
  margin-top: auto;
  animation: slideUp 0.25s ease;
}

@keyframes slideUp {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}

.feedback-status {
  font-size: 0.95rem;
  font-weight: 800;
  margin-bottom: 6px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.feedback-status.correct { color: var(--brazil-green); }
.feedback-status.wrong { color: var(--danger); }

.feedback-explanation {
  font-size: 0.85rem;
  line-height: 1.45;
  color: #D1D5DB;
  margin-bottom: 14px;
}

.feedback-repeat-notice {
  font-size: 0.76rem;
  color: #F87171;
  background: rgba(239, 68, 68, 0.1);
  padding: 6px 10px;
  border-radius: var(--radius-sm);
  margin-bottom: 12px;
}

.btn-continue {
  width: 100%;
  padding: 13px;
  background: var(--brazil-green);
  color: #070B12;
  border: none;
  border-radius: var(--radius-md);
  font-size: 0.95rem;
  font-weight: 800;
  cursor: pointer;
  box-shadow: 0 4px 16px var(--brazil-green-glow);
}

/* View: Placas (Roundabout Background) */
#view-placas {
  position: relative;
}
#view-placas::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 400px;
  background: url('../assets/illustrations/bg-roundabout.svg') top center / cover no-repeat;
  pointer-events: none;
  z-index: 0;
  opacity: 0.45;
}

.plates-tab-filter, .plates-grid {
  position: relative;
  z-index: 2;
}

.plates-tab-filter {
  display: flex;
  gap: 6px;
  overflow-x: auto;
  padding-bottom: 8px;
  margin-bottom: 14px;
  scrollbar-width: none;
}
.plates-tab-filter::-webkit-scrollbar { display: none; }

.tab-btn {
  background: rgba(14, 22, 38, 0.88);
  backdrop-filter: blur(12px);
  border: 1px solid var(--surface-border);
  color: var(--text-muted);
  padding: 6px 13px;
  border-radius: var(--radius-pill);
  font-size: 0.76rem;
  font-weight: 700;
  cursor: pointer;
  white-space: nowrap;
}

.tab-btn.active {
  background: var(--brazil-green);
  border-color: var(--brazil-green);
  color: #070B12;
  font-weight: 800;
}

.plates-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
}

.plate-card-item {
  background: rgba(14, 22, 38, 0.88);
  backdrop-filter: blur(12px);
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-md);
  padding: 12px 8px;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  cursor: pointer;
  transition: transform 0.15s ease;
}

.plate-card-item:active {
  transform: scale(0.96);
}

.plate-card-img {
  width: 58px;
  height: 58px;
  object-fit: contain;
  margin-bottom: 6px;
}

.plate-card-code {
  font-size: 0.72rem;
  font-weight: 800;
  color: #FBBF24;
}

.plate-card-title {
  font-size: 0.68rem;
  color: var(--text-muted);
  line-height: 1.25;
  margin-top: 3px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* View: Missões e Conquistas */
.mission-card {
  background: rgba(14, 22, 38, 0.88);
  backdrop-filter: blur(12px);
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-md);
  padding: 14px;
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  gap: 12px;
}

.mission-icon {
  width: 42px;
  height: 42px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  background: rgba(255, 255, 255, 0.05);
  flex-shrink: 0;
}

.mission-info {
  flex: 1;
}

.mission-title {
  font-size: 0.88rem;
  font-weight: 800;
  color: #FFFFFF;
}

.mission-desc {
  font-size: 0.72rem;
  color: var(--text-muted);
  margin-top: 1px;
}

.mission-reward {
  font-size: 0.75rem;
  font-weight: 800;
  color: #34D399;
}

.mission-claimed {
  opacity: 0.6;
}

/* Result Screen */
.result-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  flex: 1;
  text-align: center;
  padding: 24px 10px;
}

.result-trophy {
  font-size: 4rem;
  margin-bottom: 12px;
}

.result-heading {
  font-size: 1.5rem;
  font-weight: 800;
  margin-bottom: 6px;
  color: #FFFFFF;
}

.result-subheading {
  font-size: 0.88rem;
  color: var(--text-muted);
  max-width: 320px;
  line-height: 1.45;
  margin-bottom: 20px;
}

.result-kpi-row {
  display: flex;
  gap: 10px;
  width: 100%;
  margin-bottom: 24px;
}

.kpi-card {
  flex: 1;
  background: rgba(14, 22, 38, 0.88);
  backdrop-filter: blur(12px);
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-md);
  padding: 14px 10px;
}

.kpi-num {
  font-size: 1.5rem;
  font-weight: 900;
}

.kpi-lbl {
  font-size: 0.7rem;
  color: var(--text-muted);
  margin-top: 3px;
  text-transform: uppercase;
}