:root {
  --cosmic-bg: #0f172a;
  --nebula-slate: #1e293b;
  --nebula-glow: rgba(30, 41, 59, 0.8);
  --pulsar-gold: #facc15;
  --supernova-white: #f8fafc;
  --glass-bg: rgba(255, 255, 255, 0.03);
  --glass-border: rgba(255, 255, 255, 0.1);

  --bg-past: radial-gradient(circle at top left, #1e293b, #0f172a);
  --bg-present: radial-gradient(circle at top left, #064e3b, #064e3b);
  /* Temp placeholder, will refine */
  --bg-future: radial-gradient(circle at top left, #1e1b4b, #0f172a);

  --text-primary: var(--supernova-white);
  --card-bg: var(--glass-bg);
  --font-main: 'Inter', sans-serif;
  --font-display: 'Outfit', sans-serif;
}

body {
  margin: 0;
  font-family: var(--font-main);
  color: var(--text-primary);
  background-color: var(--cosmic-bg);
  transition: all 0.8s cubic-bezier(0.4, 0, 0.2, 1);
  overflow-x: hidden;
  line-height: 1.6;
}

/* GLOBAL UTILITIES */
.glass-card {
  background: var(--glass-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--glass-border);
  border-radius: 24px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.glass-card:hover {
  border-color: rgba(255, 255, 255, 0.3);
  transform: translateY(-5px);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
}

/* HERO SECTION */
.hero-section {
  min-height: 90vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 4rem 2rem;
  position: relative;
  overflow: hidden;
}

.container {
  max-width: 1000px;
  width: 100%;
  z-index: 10;
}

.brand-title {
  font-family: var(--font-display);
  font-size: 5rem;
  font-weight: 800;
  margin-bottom: 0.5rem;
  background: linear-gradient(135deg, var(--supernova-white), var(--pulsar-gold));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  letter-spacing: -0.04em;
  line-height: 1.1;
  text-transform: uppercase;
}

.subtitle {
  font-size: 1.5rem;
  font-weight: 400;
  opacity: 0.7;
  margin-bottom: 3rem;
  color: var(--supernova-white);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

/* PROGRESSION UI */
.progression-header {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
  margin-bottom: 2rem;
  width: 100%;
  max-width: 400px;
}

.stats-group {
  display: flex;
  gap: 10px;
}

.stat-badge {
  background: rgba(255, 255, 255, 0.2);
  padding: 5px 15px;
  border-radius: 50px;
  font-weight: 700;
  font-size: 0.9rem;
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.3);
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
  color: inherit;
}

.xp-container {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
}

.xp-bar {
  flex-grow: 1;
  height: 12px;
  background: rgba(255, 255, 255, 0.3);
  border-radius: 10px;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.xp-fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, #f0abfc, #d946ef);
  box-shadow: 0 0 10px rgba(217, 70, 239, 0.5);
  transition: width 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.xp-label {
  font-weight: 900;
  font-size: 0.8rem;
  opacity: 0.8;
}

.checkmark {
  color: #22c55e;
  margin-left: 5px;
  font-weight: bold;
}

.checkmark.hidden {
  display: none;
}

.example-selector {
  margin-bottom: 2rem;
  background: rgba(255, 255, 255, 0.2);
  padding: 0.5rem 1rem;
  border-radius: 50px;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  backdrop-filter: blur(5px);
}

.example-selector select {
  background: transparent;
  border: none;
  color: inherit;
  font-size: 1rem;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  outline: none;
}

.example-selector option {
  background: white;
  color: #333;
}

/* TIMELINE DISPLAY */
.timeline-display {
  background: var(--glass-bg);
  backdrop-filter: blur(16px);
  border: 1px solid var(--glass-border);
  padding: 3rem;
  border-radius: 32px;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
  margin-bottom: 3rem;
  color: var(--supernova-white);
  transition: all 0.4s ease;
}

.timeline-display h2 {
  font-size: 2.5rem;
  margin: 0;
}

.timeline-display .highlight {
  color: #d946ef;
  /* Distinct Verb Color */
  text-decoration: underline;
  text-decoration-thickness: 4px;
}

.time-label {
  margin-top: 1.5rem;
  font-weight: 800;
  letter-spacing: 4px;
  font-size: 1rem;
  color: var(--pulsar-gold);
  opacity: 0.9;
}

/* SLIDER */
.slider-container {
  width: 100%;
  margin-top: 2rem;
}

.range-labels {
  display: flex;
  justify-content: space-between;
  font-weight: 600;
  margin-bottom: 10px;
  opacity: 0.9;
}

/* X-RAY MODE TOGGLE */
.xray-toggle-container {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  margin-bottom: 1.5rem;
}

.xray-label {
  font-size: 0.9rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  opacity: 0.8;
}

/* X-RAY COLORS */
.xray-active .xray-aux {
  color: #ef4444 !important;
  /* Red */
  font-weight: bold;
  background-color: #ffe6e6;
  padding: 0 4px;
  border-radius: 4px;
}

.xray-active .xray-verb {
  color: #3b82f6 !important;
  /* Blue */
  font-weight: bold;
  background-color: #e6f2ff;
  padding: 0 4px;
  border-radius: 4px;
}

.xray-active .xray-trigger {
  color: #22c55e !important;
  /* Green */
  font-weight: bold;
  border-bottom: 2px dashed #22c55e;
}

.time-slider {
  appearance: none;
  -webkit-appearance: none;
  width: 100%;
  height: 15px;
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.3);
  outline: none;
  transition: opacity .2s;
}

.time-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 30px;
  height: 30px;
  border-radius: 50%;
  background: #fff;
  cursor: pointer;
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.3);
  transition: transform 0.1s;
}

.time-slider::-webkit-slider-thumb:hover {
  transform: scale(1.2);
}

/* ASPECT CONTROLS */
.aspect-controls {
  margin-top: 2rem;
  display: flex;
  justify-content: center;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.aspect-label {
  font-weight: 700;
  margin-right: 1rem;
  align-self: center;
  color: var(--supernova-white);
  opacity: 0.8;
}

.aspect-btn {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  padding: 0.6rem 1.2rem;
  border-radius: 20px;
  cursor: pointer;
  font-weight: 600;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  font-family: var(--font-main);
  color: var(--supernova-white);
}

.aspect-btn:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: var(--pulsar-gold);
}

.aspect-btn.active {
  background: var(--pulsar-gold);
  color: var(--cosmic-bg);
  border-color: var(--pulsar-gold);
  box-shadow: 0 0 15px rgba(250, 204, 21, 0.4);
}

/* CONTENT CONTAINER */
.content-container {
  padding: 6rem 2rem;
  background: var(--cosmic-bg);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
  max-width: 1000px;
  margin: 0 auto;
}

.feature-card {
  background: var(--glass-bg);
  backdrop-filter: blur(12px);
  border: 1px solid var(--glass-border);
  padding: 2.5rem;
  border-radius: 24px;
  text-align: center;
  color: var(--supernova-white);
  transition: all 0.4s ease;
}

.feature-card:hover {
  border-color: var(--pulsar-gold);
  transform: translateY(-5px);
}

/* MODULE SECTIONS */
.module-section {
  max-width: 800px;
  margin: 4rem auto;
  text-align: center;
}

.section-title {
  font-family: var(--font-display);
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--supernova-white);
  margin-bottom: 0.75rem;
  letter-spacing: -0.02em;
}

.section-desc {
  font-size: 1.1rem;
  color: #94a3b8;
  /* Clearer slate on dark */
  margin-bottom: 3rem;
  max-width: 700px;
  margin-left: auto;
  margin-right: auto;
}


/* BATTLE ARENA */
.battle-arena {
  display: flex;
  align-items: stretch;
  justify-content: center;
  gap: 1rem;
  position: relative;
  margin-top: 2rem;
}

.combatant {
  flex: 1;
  background: rgba(255, 255, 255, 0.03);
  backdrop-filter: blur(10px);
  padding: 2rem;
  border-radius: 24px;
  border: 1px solid rgba(255, 255, 255, 0.1);
  transition: all 0.4s ease;
  text-align: left;
  color: var(--supernova-white);
}

.combatant-left {
  border-left: 4px solid #ef4444;
}

.combatant-right {
  border-left: 4px solid #3b82f6;
}

.combatant:hover {
  background: rgba(255, 255, 255, 0.06);
  border-color: rgba(255, 255, 255, 0.3);
  transform: translateY(-8px);
}

.vs-badge {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: #1e293b;
  color: white;
  width: 50px;
  height: 50px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-style: italic;
  border: 4px solid white;
  z-index: 10;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
}

.combat-content h4 {
  font-size: 1.8rem;
  margin: 1.5rem 0;
  min-height: 4rem;
  color: var(--supernova-white);
  font-family: var(--font-display);
  font-weight: 700;
  text-shadow: 0 0 10px rgba(255, 255, 255, 0.1);
}

.combat-info-section {
  margin-bottom: 1.5rem;
  background: rgba(0, 0, 0, 0.15);
  padding: 1rem;
  border-radius: 12px;
  border: 1px solid rgba(255, 255, 255, 0.05);
  text-align: left;
}

.info-label {
  font-size: 0.7rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: var(--pulsar-gold);
  margin-bottom: 0.5rem;
  opacity: 0.6;
}

.combat-nuance,
.combat-story,
.combat-implication {
  font-size: 0.95rem;
  line-height: 1.6;
  color: #e2e8f0;
}

/* LANG STYLING */
.lang-en {
  font-weight: 600;
  margin-bottom: 4px;
}

.lang-uz {
  font-size: 0.85rem;
  color: #94a3b8;
  font-style: italic;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: 4px;
  margin-top: 4px;
}

/* BATTLE HUB */
.battle-selection-hub {
  margin-bottom: 3rem;
  padding: 2rem;
  text-align: center;
}

.battle-selection-hub h3 {
  font-family: var(--font-display);
  margin-bottom: 1.5rem;
  color: var(--pulsar-gold);
}

.battle-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 1rem;
}

.battle-card {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--glass-border);
  border-radius: 16px;
  padding: 1.2rem;
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.8rem;
}

.battle-card:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: var(--pulsar-gold);
  transform: translateY(-3px);
}

.battle-card.active {
  background: rgba(250, 204, 21, 0.15);
  border-color: var(--pulsar-gold);
  box-shadow: 0 0 20px rgba(250, 204, 21, 0.2);
}

.battle-icon {
  font-size: 2rem;
}

.battle-names {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--supernova-white);
}

/* REFINED ARENA */
.battle-arena {
  display: flex;
  align-items: stretch;
  gap: 2rem;
  position: relative;
  perspective: 1000px;
}

.combatant {
  flex: 1;
  position: relative;
  overflow: hidden;
  padding: 3rem 2rem;
}

.side-indicator {
  position: absolute;
  top: 1rem;
  left: 1rem;
  font-size: 0.6rem;
  font-weight: 900;
  letter-spacing: 2px;
  opacity: 0.3;
}

.vs-container {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  position: relative;
  z-index: 5;
}

.vs-badge {
  background: linear-gradient(135deg, #ef4444, #3b82f6);
  width: 70px;
  height: 70px;
  font-size: 1.5rem;
  border: 4px solid var(--cosmic-bg);
  box-shadow: 0 0 30px rgba(0, 0, 0, 0.5);
  animation: pulseVS 2s infinite;
}

@keyframes pulseVS {
  0% {
    transform: scale(1);
    box-shadow: 0 0 10px rgba(255, 255, 255, 0.2);
  }

  50% {
    transform: scale(1.1);
    box-shadow: 0 0 30px rgba(255, 255, 255, 0.4);
  }

  100% {
    transform: scale(1);
    box-shadow: 0 0 10px rgba(255, 255, 255, 0.2);
  }
}

.vs-glow {
  position: absolute;
  width: 2px;
  height: 100%;
  background: linear-gradient(to bottom, transparent, var(--pulsar-gold), transparent);
  opacity: 0.3;
}

/* MATRIX UZ STYLING */
.uz-title {
  font-size: 1.2rem;
  opacity: 0.7;
  font-weight: 400;
}

.matrix-desc-uz {
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  color: #94a3b8;
  font-style: italic;
}

.feedback {
  margin-top: 1.5rem;
  padding: 1rem;
  border-radius: 8px;
  font-weight: 500;
}

/* TENSE IN THE WILD */
.media-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
  margin-top: 2rem;
}

.media-card {
  background: var(--glass-bg);
  backdrop-filter: blur(12px);
  border: 1px solid var(--glass-border);
  border-radius: 20px;
  overflow: hidden;
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
  text-align: left;
  color: var(--supernova-white);
}

/* WILD GALLERY */
.wild-gallery-controls {
  display: flex;
  justify-content: center;
  gap: 1rem;
  margin-bottom: 2rem;
}

.wild-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 2rem;
}

.wild-card {
  background: var(--glass-bg);
  backdrop-filter: blur(16px);
  border: 1px solid var(--glass-border);
  border-radius: 24px;
  overflow: hidden;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
  transition: all 0.4s ease;
  display: flex;
  flex-direction: column;
}

.wild-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.1);
}

.wild-header {
  padding: 1.2rem;
  background: rgba(255, 255, 255, 0.05);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-weight: 700;
  color: var(--pulsar-gold);
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.wild-video-container {
  position: relative;
  padding-bottom: 56.25%;
  /* 16:9 Aspect Ratio */
  height: 0;
  overflow: hidden;
  background: black;
}

.wild-video-container iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}

.wild-visual-placeholder {
  height: 150px;
  background: linear-gradient(45deg, #1e293b, #334155);
  display: flex;
  align-items: center;
  justify-content: center;
  color: rgba(255, 255, 255, 0.4);
  font-weight: 800;
  font-size: 1.5rem;
  letter-spacing: -1px;
}

.wild-body {
  padding: 1.5rem;
  flex: 1;
}

.yt-link {
  text-decoration: none;
  color: #ef4444;
  /* YouTube Redish */
  font-weight: 600;
  transition: opacity 0.2s;
}

/* MASTERY DASHBOARD */
.mastery-dashboard {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
}

.mastery-card {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 28px;
  padding: 2.5rem;
  text-align: center;
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.mastery-card:hover {
  background: rgba(255, 255, 255, 0.06);
  border-color: var(--pulsar-gold);
  transform: scale(1.03);
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.3);
}

.mastery-icon {
  font-size: 3.5rem;
  margin-bottom: 0.5rem;
  filter: drop-shadow(0 0 15px rgba(255, 255, 255, 0.2));
}

.mastery-card h3 {
  font-family: var(--font-display);
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--supernova-white);
}

.mastery-card p {
  font-size: 0.95rem;
  opacity: 0.6;
}

.tense-report {
  margin-top: 1.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  text-align: left;
}

.report-item {
  display: flex;
  justify-content: space-between;
  margin-bottom: 0.5rem;
  font-size: 0.9rem;
}

.report-check {
  color: #10b981;
}

.report-cross {
  color: #ef4444;
}

/* READING MASTERY */
.reading-mastery-container {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.reading-card {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  background: var(--glass-bg);
  backdrop-filter: blur(16px);
  border: 1px solid var(--glass-border);
  padding: 3rem;
  border-radius: 32px;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.3);
}

.reading-context {
  background: rgba(15, 23, 42, 0.6);
  padding: 2.5rem;
  border-radius: 20px;
  border-left: 6px solid var(--pulsar-gold);
  line-height: 2;
  font-size: 1.15rem;
  color: #e2e8f0;
}

.reading-context h4 {
  margin-bottom: 1.5rem;
  color: var(--pulsar-gold);
  font-family: var(--font-display);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.reading-question-box {
  display: flex;
  flex-direction: column;
  justify-content: center;
}

@media (max-width: 900px) {
  .reading-card {
    grid-template-columns: 1fr;
  }
}


.wild-quote {
  font-size: 1.1rem;
  font-style: italic;
  margin-bottom: 1rem;
  line-height: 1.5;
  color: var(--text-primary);
}

.wild-footer {
  padding: 1.5rem 2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  font-size: 0.9rem;
  color: #94a3b8;
}

.wild-tense-tag {
  display: inline-block;
  padding: 0.4rem 0.8rem;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  color: var(--pulsar-gold);
  font-weight: 700;
  font-size: 0.75rem;
  margin-top: 1rem;
}

/* NUANCE GLOBAL */
.nuance-world-container {
  background: var(--glass-bg);
  backdrop-filter: blur(16px);
  border: 1px solid var(--glass-border);
  border-radius: 32px;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.3);
  overflow: hidden;
  padding: 2.5rem;
}

.region-picker {
  display: flex;
  background: rgba(255, 255, 255, 0.03);
  padding: 1.5rem;
  gap: 1.5rem;
  justify-content: center;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.region-btn {
  padding: 0.5rem 1.5rem;
  border-radius: 30px;
  border: 1px solid #e2e8f0;
  background: white;
  cursor: pointer;
  font-weight: 600;
  transition: all 0.2s;
}

.region-btn.active {
  background: var(--pulsar-gold);
  color: var(--cosmic-bg);
  border-color: var(--pulsar-gold);
}

.nuance-display-area {
  padding: 2rem;
  min-height: 300px;
}

.nuance-entry {
  margin-bottom: 2rem;
  padding-bottom: 2rem;
  border-bottom: 1px dashed #e2e8f0;
  animation: fadeIn 0.5s ease;
}

.nuance-entry:last-child {
  border-bottom: none;
  margin-bottom: 0;
  padding-bottom: 0;
}

.filter-btn {
  padding: 0.5rem 1.5rem;
  border-radius: 30px;
  border: 1px solid #e2e8f0;
  background: white;
  cursor: pointer;
  font-weight: 600;
  transition: all 0.2s;
}

.filter-btn.active {
  background: var(--pulsar-gold);
  color: var(--cosmic-bg);
  border-color: var(--pulsar-gold);
  box-shadow: 0 0 15px rgba(250, 204, 21, 0.4);
}

.feedback.correct {
  background: #dcfce7;
  color: #166534;
  border: 1px solid #bbf7d0;
}

.feedback.wrong {
  background: #fee2e2;
  color: #991b1b;
  border: 1px solid #fecaca;
}

.hidden {
  display: none;
}

/* CONTRASTIVE TOGGLE */
.contrast-container {
  background: var(--glass-bg);
  backdrop-filter: blur(12px);
  border: 1px solid var(--glass-border);
  padding: 3rem;
  border-radius: 32px;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.3);
}

.toggle-header {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  font-weight: 700;
  font-size: 1.1rem;
  margin-bottom: 2rem;
}

/* The Switch - Box around the slider */
.switch {
  position: relative;
  display: inline-block;
  width: 60px;
  height: 34px;
}

.switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: #ccc;
  transition: .4s;
}

.slider:before {
  position: absolute;
  content: "";
  height: 26px;
  width: 26px;
  left: 4px;
  bottom: 4px;
  background-color: white;
  transition: .4s;
}

input:checked+.slider {
  background-color: #2196F3;
}

input:checked+.slider:before {
  transform: translateX(26px);
}

/* Rounded sliders */
.slider.round {
  border-radius: 34px;
}

.slider.round:before {
  border-radius: 50%;
}

.highlight-red {
  color: #ef4444;
  text-decoration: underline;
}

.highlight-blue {
  color: #3b82f6;
  text-decoration: underline;
}

.implication {
  background: #f8fafc;
  padding: 1rem;
  border-left: 4px solid #3b82f6;
  margin-top: 1rem;
  text-align: left;
}

/* ASPECT MATRIX GRID */
.matrix-grid {
  display: grid;
  grid-template-columns: 120px repeat(3, 1fr);
  gap: 1.5rem;
  padding: 2rem;
  background: rgba(15, 23, 42, 0.4);
  border-radius: 32px;
  border: 1px solid rgba(255, 255, 255, 0.05);
}

.matrix-header {
  text-align: center;
  font-weight: 800;
  color: #64748b;
  padding: 10px;
  letter-spacing: 2px;
}

.matrix-side-header {
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 0.8rem;
  letter-spacing: 0.1rem;
  color: var(--pulsar-gold);
  text-transform: uppercase;
  background: rgba(250, 204, 21, 0.05);
  border-radius: 12px;
}

.matrix-card {
  padding: 1.5rem;
  text-align: center;
  border-radius: 20px;
  cursor: pointer;
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid rgba(255, 255, 255, 0.08);
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.matrix-card:hover {
  background: rgba(255, 255, 255, 0.05);
  border-color: var(--pulsar-gold);
  transform: translateY(-8px) scale(1.02);
  box-shadow: 0 15px 35px rgba(250, 204, 21, 0.15);
}

.card-title {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  color: var(--supernova-white);
}

.card-formula {
  font-size: 0.8rem;
  opacity: 0.6;
  font-family: monospace;
}

/* BRIDGE VISUALIZATION */
.matrix-card[data-tense="present-perfect"] .bridge-visual {
  position: absolute;
  bottom: 0;
  left: -100%;
  width: 200%;
  height: 4px;
  background: linear-gradient(90deg, transparent, #3b82f6, transparent);
  transition: left 0.6s ease;
  opacity: 0;
}

.highlight-row {
  color: #3b82f6;
  cursor: help;
}

.bridge-active .matrix-card[data-tense="present-perfect"] .bridge-visual {
  left: 0;
  opacity: 1;
}

/* DETAIL BOX */
.detail-box {
  margin-top: 2rem;
  background: #1e293b;
  color: white;
  padding: 2rem;
  border-radius: 16px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
  animation: fadeIn 0.4s ease;
}

.close-btn {
  margin-top: 1.5rem;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.2);
  color: white;
  padding: 0.5rem 1.5rem;
  border-radius: 8px;
  cursor: pointer;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* =========================================
   RESPONSIVENESS & ANIMATIONS
   ========================================= */

@media (max-width: 768px) {
  .brand-title {
    font-size: 2rem;
  }

  .timeline-display h2 {
    font-size: 1.5rem;
  }

  .range-labels {
    font-size: 0.8rem;
  }

  .module-section {
    margin: 2rem auto;
    padding: 0 1rem;
  }

  .scenario-card,
  .contrast-container,
  .nuance-container {
    padding: 1.5rem;
  }

  .toggle-header {
    flex-direction: column;
    gap: 0.5rem;
  }

  .chat-interface {
    width: 100%;
    border-radius: 12px;
  }
}

/* Animations */
/* QUIZ STYLES */
.quiz-container {
  margin-top: 2rem;
  padding-top: 2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  animation: fadeIn 0.5s ease;
}

.quiz-card {
  background: rgba(15, 23, 42, 0.8);
  backdrop-filter: blur(20px);
  padding: 3rem;
  border-radius: 32px;
  border: 1px solid var(--glass-border);
  box-shadow: 0 30px 60px rgba(0, 0, 0, 0.4);
  text-align: left;
  color: var(--supernova-white);
}

.difficulty-selector {
  display: flex;
  gap: 10px;
  margin-bottom: 1.5rem;
}

.difficulty-selector button {
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.2);
  color: white;
  padding: 4px 12px;
  border-radius: 4px;
  cursor: pointer;
  font-size: 0.8rem;
  transition: all 0.2s;
}

.difficulty-selector button.active {
  background: #3b82f6;
  border-color: #3b82f6;
}

.quiz-question {
  font-size: 1.2rem;
  font-weight: 60 0;
  margin-bottom: 1.5rem;
}

.quiz-options {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
}

.quiz-opt-btn {
  background: rgba(255, 255, 255, 0.03);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(255, 255, 255, 0.08);
  color: var(--supernova-white);
  padding: 1rem 1.5rem;
  border-radius: 16px;
  text-align: left;
  cursor: pointer;
  transition: all 0.4s cubic-bezier(0.2, 0.8, 0.2, 1);
  font-family: inherit;
  font-size: 1.1rem;
  display: flex;
  align-items: center;
  gap: 1.2rem;
  position: relative;
  overflow: hidden;
  width: 100%;
}

.quiz-opt-btn:hover:not(:disabled) {
  background: rgba(255, 255, 255, 0.07);
  border-color: var(--pulsar-gold);
  transform: translateX(8px);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3), 0 0 15px rgba(250, 204, 21, 0.1);
}

.quiz-opt-btn:hover .opt-letter {
  background: var(--pulsar-gold);
  color: #0f172a;
  transform: scale(1.1);
}

.opt-letter {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 8px;
  font-weight: 800;
  font-size: 0.9rem;
  color: var(--pulsar-gold);
  transition: all 0.3s ease;
  flex-shrink: 0;
}

.quiz-opt-btn.correct {
  background: rgba(34, 197, 94, 0.15) !important;
  border-color: #22c55e !important;
  color: #f8fafc;
  box-shadow: 0 0 20px rgba(34, 197, 94, 0.2);
}

.quiz-opt-btn.correct .opt-letter {
  background: #22c55e;
  color: white;
}

.quiz-opt-btn.wrong {
  background: rgba(239, 68, 68, 0.15) !important;
  border-color: #ef4444 !important;
  color: #f8fafc;
  box-shadow: 0 0 20px rgba(239, 68, 68, 0.2);
}

.quiz-opt-btn.wrong .opt-letter {
  background: #ef4444;
  color: white;
}

.quiz-feedback {
  margin-top: 2rem;
  padding: 1.5rem 2rem;
  background: rgba(255, 255, 255, 0.03);
  backdrop-filter: blur(10px);
  border-radius: 16px;
  color: #94a3b8;
  border-left: 5px solid var(--pulsar-gold);
  animation: slideUp 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.why-btn {
  background: transparent;
  border: 1px solid #3b82f6;
  color: #3b82f6;
  padding: 4px 10px;
  border-radius: 4px;
  cursor: pointer;
  margin-right: 10px;
  font-size: 0.85rem;
}

.next-btn {
  background: #3b82f6;
  color: white;
  border: none;
  padding: 8px 16px;
  border-radius: 6px;
  cursor: pointer;
  font-weight: 600;
}

.why-text {
  margin: 1rem 0;
  font-style: italic;
  font-size: 0.9rem;
  color: #94a3b8;
  padding-left: 10px;
  border-left: 2px solid #3b82f6;
}

.result-card {
  text-align: center;
}

.result-card h3 {
  color: #fbbf24;
  font-size: 1.5rem;
  margin-bottom: 1.5rem;
}

/* GLOBAL NUANCE & WILD GALLERY */
.nuance-world-container,
.wild-grid {
  background: rgba(15, 23, 42, 0.4);
  padding: 3rem;
  border-radius: 32px;
  border: 1px solid rgba(255, 255, 255, 0.05);
  backdrop-filter: blur(10px);
}

.nuance-entry,
.wild-card {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 20px;
  padding: 2rem;
  margin-bottom: 2rem;
  transition: all 0.4s ease;
}

.nuance-entry:hover,
.wild-card:hover {
  background: rgba(255, 255, 255, 0.06);
  border-color: var(--pulsar-gold);
}

/* New Global Nuance Styles */
.nuance-header-area {
  margin-bottom: 2.5rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  padding-bottom: 1rem;
}

.nuance-region-title {
  font-size: 2rem;
  margin-bottom: 0.5rem;
  font-family: var(--font-display);
  background: linear-gradient(135deg, var(--supernova-white), var(--pulsar-gold));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.nuance-region-subtitle {
  color: var(--supernova-white);
  opacity: 0.8;
  font-size: 1.1rem;
}

.nuance-entry {
  border-left: 4px solid var(--accent-color, var(--pulsar-gold));
  margin-bottom: 2.5rem;
  padding: 2rem;
  background: rgba(255, 255, 255, 0.02);
  border-radius: 0 16px 16px 0;
  transition: transform 0.3s ease;
}

.nuance-entry:hover {
  transform: translateX(10px);
  background: rgba(255, 255, 255, 0.04);
}

.nuance-situation {
  color: var(--pulsar-gold);
  margin-bottom: 0.8rem;
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.1rem;
  font-weight: 700;
}

.nuance-example {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: 1.5rem;
  color: var(--supernova-white);
  line-height: 1.4;
}

.nuance-rule-box {
  background: var(--nebula-slate);
  padding: 1.2rem;
  border-radius: 12px;
  color: #94a3b8;
  font-size: 0.95rem;
  border: 1px solid rgba(255, 255, 255, 0.05);
}

.nuance-rule-box strong {
  color: var(--supernova-white);
  margin-right: 0.5rem;
}

.region-btn,
.filter-btn {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  color: var(--supernova-white);
  padding: 0.8rem 1.5rem;
  border-radius: 12px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
}

.region-btn.active,
.filter-btn.active {
  background: var(--pulsar-gold);
  color: var(--cosmic-bg);
  border-color: var(--pulsar-gold);
  box-shadow: 0 0 20px rgba(250, 204, 21, 0.3);
}

/* INTERACTIVE ANIMATIONS */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.module-section {
  animation: fadeInUp 0.8s cubic-bezier(0.2, 0.8, 0.2, 1) both;
}

.module-section:nth-child(1) {
  animation-delay: 0.1s;
}

.module-section:nth-child(2) {
  animation-delay: 0.2s;
}

.module-section:nth-child(3) {
  animation-delay: 0.3s;
}

.module-section:nth-child(4) {
  animation-delay: 0.4s;
}

@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(10px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes popIn {
  0% {
    transform: scale(0.9);
    opacity: 0;
  }

  100% {
    transform: scale(1);
    opacity: 1;
  }
}

.timeline-display,
.scenario-card,
.chat-interface {
  animation: popIn 0.6s cubic-bezier(0.22, 1, 0.36, 1);
}

/* REFINEMENT: BADGES & TOASTS */
.badge-btn {
  cursor: pointer;
  transition: all 0.2s;
  border: 1px solid rgba(255, 255, 255, 0.4) !important;
}

.badge-btn:hover {
  background: rgba(255, 255, 255, 0.3) !important;
  transform: translateY(-2px);
}

/* Modal Styling */
.modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.8);
  backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 2000;
  transition: opacity 0.3s ease;
}

.modal.hidden {
  display: none;
}

.modal-content {
  background: radial-gradient(circle at top left, #1e293b, #0f172a);
  border: 1px solid rgba(255, 255, 255, 0.15);
  backdrop-filter: blur(12px);
  border-radius: 28px;
  width: 95%;
  max-width: 850px;
  height: auto;
  max-height: 85vh;
  display: flex;
  flex-direction: column;
  padding: 2.5rem;
  box-shadow: 0 40px 100px -20px rgba(0, 0, 0, 0.8);
  animation: popIn 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.modal-header h2 {
  margin: 0;
  font-size: 2rem;
  background: linear-gradient(135deg, #fefce8, #facc15);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  font-family: var(--font-display);
  letter-spacing: -0.02em;
}

.close-modal {
  background: transparent;
  border: none;
  color: white;
  font-size: 2rem;
  cursor: pointer;
  line-height: 1;
}

/* Badges Grid */
.badges-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 1.2rem;
  max-height: 60vh;
  overflow-y: auto;
  padding: 1rem;
}

.badges-grid::-webkit-scrollbar {
  width: 8px;
}

.badges-grid::-webkit-scrollbar-track {
  background: rgba(255, 255, 255, 0.05);
  border-radius: 10px;
}

.badges-grid::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.2);
  border-radius: 10px;
}

.badge-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  gap: 0.75rem;
  padding: 1.5rem 1rem;
  border-radius: 20px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.08);
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
}

.badge-item.unlocked {
  background: rgba(250, 204, 21, 0.05);
  border-color: rgba(250, 204, 21, 0.3);
  box-shadow: 0 0 20px rgba(250, 204, 21, 0.1);
}

.badge-item.unlocked:hover {
  transform: translateY(-5px);
  background: rgba(250, 204, 21, 0.1);
  border-color: rgba(250, 204, 21, 0.6);
  box-shadow: 0 10px 30px rgba(250, 204, 21, 0.2);
}

.badge-icon {
  font-size: 2.5rem;
  filter: drop-shadow(0 0 10px rgba(255, 255, 255, 0.2));
}

.badge-label {
  font-weight: 700;
  color: #f8fafc;
  font-size: 1.1rem;
}

.badge-item.locked {
  opacity: 0.4;
  background: rgba(255, 255, 255, 0.02);
  border-style: dashed;
}

.badge-item.locked .badge-icon {
  filter: grayscale(1) blur(1px);
}

.badge-item.unlocked {
  border-color: #fbbf24;
  background: rgba(251, 191, 36, 0.1);
  box-shadow: 0 0 15px rgba(251, 191, 36, 0.2);
}

.badge-icon {
  font-size: 2.5rem;
}

.badge-label {
  font-size: 0.8rem;
  font-weight: 700;
  text-align: center;
}

/* Toast Notifications */
.toast-container {
  position: fixed;
  top: 20px;
  right: 20px;
  z-index: 3000;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.toast {
  background: rgba(0, 0, 0, 0.9);
  color: white;
  padding: 1rem 1.5rem;
  border-radius: 10px;
  border-left: 4px solid #3b82f6;
  box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.3);
  display: flex;
  align-items: center;
  gap: 10px;
  animation: slideOutLeft 0.3s ease reverse;
  cursor: pointer;
}

.toast.level-up {
  border-left-color: #fbbf24;
  background: linear-gradient(90deg, #1e1b4b, #312e81);
}

.toast.badge-unlock {
  border-left-color: #10b981;
}

@keyframes slideOutLeft {
  from {
    transform: translateX(0);
    opacity: 1;
  }

  to {
    transform: translateX(100%);
    opacity: 0;
  }
}

/* DETECTIVE MODE ENHANCEMENTS */
.case-selection select {
  background: rgba(255, 255, 255, 0.1);
  color: white;
  border: 1px solid rgba(255, 255, 255, 0.2);
  padding: 0.3rem 0.6rem;
  border-radius: 6px;
  font-size: 0.85rem;
  cursor: pointer;
  outline: none;
}

.case-selection select option {
  background: #1e293b;
  color: white;
}

.case-description {
  background: rgba(15, 23, 42, 0.6);
  padding: 1.5rem 2rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  font-size: 1rem;
  color: #94a3b8;
  line-height: 1.6;
  animation: fadeInDown 0.4s ease;
}

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

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.mastery-sub-btn-group {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.5rem;
  width: 100%;
  margin-top: 1rem;
}

.mastery-sub-btn-group .quiz-trigger-btn {
  padding: 0.6rem;
  font-size: 0.85rem;
  margin-top: 0;
  width: 100%;
}

.early-submit-btn {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.2);
  color: var(--supernova-white);
  opacity: 0.7;
  padding: 0.6rem 1.2rem;
  border-radius: 10px;
  font-size: 0.85rem;
  cursor: pointer;
  transition: all 0.3s ease;
  font-family: var(--font-display);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.early-submit-btn:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: var(--pulsar-gold);
  color: var(--pulsar-gold);
  opacity: 1;
}