/* Veelearn - Dark Professional Educational Design */

:root {
  /* Professional Educational Colors */
  --primary: #3b82f6;      /* Bright Blue */
  --secondary: #10b981;    /* Green */
  --accent: #f59e0b;       /* Amber */
  --success: #10b981;      /* Green */
  --warning: #f59e0b;      /* Amber */
  --danger: #ef4444;       /* Red */
  --info: #06b6d4;         /* Cyan */
  
  /* Dark Theme Neutrals */
  --bg-dark: #0f172a;      /* Very Dark Blue */
  --bg-card: #1e293b;      /* Dark Slate */
  --bg-input: #0f172a;     /* Very Dark Blue */
  --text-light: #f1f5f9;   /* Almost White */
  --text-muted: #cbd5e1;   /* Light Gray */
  --border: #334155;       /* Dark Gray */
  
  /* Typography */
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', sans-serif;
  --font-mono: 'Menlo', 'Monaco', 'Courier New', monospace;
  
  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  
  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.6);
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-dark);
  color: var(--text-light);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ===== HEADER ===== */
header {
  background-color: #0f172a;
  padding: var(--spacing-lg) var(--spacing-xl);
  border-bottom: 3px solid var(--primary);
  box-shadow: var(--shadow-md);
  display: flex;
  justify-content: space-between;
  align-items: center;
  position: sticky;
  top: 0;
  z-index: 100;
}

header h1 {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--text-light);
  letter-spacing: -0.5px;
  margin: 0;
}

header h1::first-letter {
  color: var(--accent);
}

header nav {
  display: flex;
  gap: var(--spacing-lg);
  align-items: center;
  flex-wrap: wrap;
}

header a,
header button {
  color: var(--text-muted);
  text-decoration: none;
  font-weight: 500;
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-md);
  transition: all 0.2s ease;
  border: 2px solid transparent;
  cursor: pointer;
  background: transparent;
  font-size: 0.95rem;
}

header a:hover {
  color: var(--accent);
  background-color: rgba(245, 158, 11, 0.1);
}

header button {
  background-color: var(--danger);
  color: white;
  border-color: var(--danger);
  font-weight: 600;
}

header button:hover {
  background-color: #dc2626;
  box-shadow: var(--shadow-md);
}

header #logout-button {
  margin-left: auto;
}

/* ===== MAIN CONTENT ===== */
main {
  flex: 1;
  padding: var(--spacing-xl);
  max-width: 1400px;
  margin: 0 auto;
  width: 100%;
}

section {
  background-color: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
  margin-bottom: var(--spacing-xl);
  box-shadow: var(--shadow-md);
  border: 1px solid var(--border);
}

section h2 {
  color: var(--primary);
  margin-bottom: var(--spacing-lg);
  font-size: 2rem;
  font-weight: 700;
  border-bottom: 2px solid var(--primary);
  padding-bottom: var(--spacing-md);
  letter-spacing: -0.5px;
}

section h3 {
  color: var(--text-light);
  margin-top: var(--spacing-lg);
  margin-bottom: var(--spacing-md);
  font-size: 1.375rem;
  font-weight: 600;
}

section h4 {
  color: var(--primary);
  margin-top: var(--spacing-md);
  margin-bottom: var(--spacing-sm);
  font-size: 1.125rem;
  font-weight: 600;
}

section p {
  color: var(--text-muted);
  margin-bottom: var(--spacing-md);
  line-height: 1.8;
}

/* ===== LANDING PAGE ===== */
#landing-page {
  background: linear-gradient(135deg, var(--bg-dark) 0%, #1a365d 100%);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  padding: 0;
}

#landing-page section {
  background: transparent;
  border: none;
  box-shadow: none;
  padding: 0;
  margin-bottom: 0;
  max-width: 900px;
}

#landing-page h1 {
  font-size: 3rem;
  color: var(--text-light);
  margin-bottom: var(--spacing-lg);
  text-align: center;
}

#landing-page h1 span {
  color: var(--accent);
}

#landing-page p {
  font-size: 1.2rem;
  color: var(--text-muted);
  text-align: center;
  margin-bottom: var(--spacing-xl);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.landing-buttons {
  display: flex;
  gap: var(--spacing-md);
  justify-content: center;
  margin-bottom: var(--spacing-2xl);
  flex-wrap: wrap;
}

.landing-buttons button {
  padding: var(--spacing-md) var(--spacing-xl);
  font-size: 1.1rem;
  border-radius: var(--radius-lg);
  border: none;
  cursor: pointer;
  font-weight: 600;
  transition: all 0.3s ease;
}

.landing-buttons .primary-btn {
  background-color: var(--primary);
  color: white;
}

.landing-buttons .primary-btn:hover {
  background-color: #2563eb;
  box-shadow: 0 0 30px rgba(59, 130, 246, 0.4);
  transform: translateY(-2px);
}

.landing-buttons .secondary-btn {
  background-color: transparent;
  color: var(--text-light);
  border: 2px solid var(--primary);
}

.landing-buttons .secondary-btn:hover {
  background-color: rgba(59, 130, 246, 0.1);
  border-color: var(--accent);
  color: var(--accent);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-xl);
  margin-top: var(--spacing-2xl);
}

.feature-card {
  background-color: rgba(59, 130, 246, 0.05);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
  transition: all 0.3s ease;
  text-align: center;
}

.feature-card:hover {
  border-color: var(--primary);
  box-shadow: 0 0 30px rgba(59, 130, 246, 0.2);
  transform: translateY(-4px);
  background-color: rgba(59, 130, 246, 0.1);
}

.feature-card h3 {
  color: var(--primary);
  margin-bottom: var(--spacing-md);
  margin-top: 0;
}

.feature-card p {
  color: var(--text-muted);
  font-size: 0.95rem;
}

.feature-icon {
  font-size: 2.5rem;
  margin-bottom: var(--spacing-md);
}

/* ===== FORMS ===== */
.auth-form {
  max-width: 420px;
  margin: 0 auto;
  padding: var(--spacing-xl);
  background-color: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
}

.auth-form h3 {
  text-align: center;
  margin-top: 0;
  margin-bottom: var(--spacing-lg);
  color: var(--primary);
}

.auth-form form {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
}

input[type="email"],
input[type="password"],
input[type="text"],
input[type="number"],
textarea,
select {
  padding: var(--spacing-md);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background-color: var(--bg-input);
  color: var(--text-light);
  font-family: inherit;
  font-size: 1rem;
  transition: all 0.2s ease;
}

input[type="email"]:focus,
input[type="password"]:focus,
input[type="text"]:focus,
input[type="number"]:focus,
textarea:focus,
select:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);
}

input::placeholder,
textarea::placeholder {
  color: var(--text-muted);
}

/* ===== BUTTONS ===== */
button,
.btn,
.primary-btn,
.secondary-btn {
  padding: var(--spacing-md) var(--spacing-lg);
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  font-weight: 600;
  font-size: 1rem;
  transition: all 0.2s ease;
  font-family: inherit;
}

button[type="submit"],
.primary-btn {
  background-color: var(--primary);
  color: white;
  margin-top: var(--spacing-md);
}

button[type="submit"]:hover,
.primary-btn:hover {
  background-color: #2563eb;
  box-shadow: 0 0 20px rgba(59, 130, 246, 0.3);
}

button[type="submit"]:active,
.primary-btn:active {
  transform: scale(0.98);
}

.secondary-btn {
  background-color: rgba(59, 130, 246, 0.1);
  color: var(--primary);
  border: 1px solid var(--primary);
}

.secondary-btn:hover {
  background-color: rgba(59, 130, 246, 0.2);
  border-color: var(--accent);
  color: var(--accent);
}

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

.success-btn:hover {
  background-color: #059669;
  box-shadow: 0 0 20px rgba(16, 185, 129, 0.3);
}

.create-course-btn {
  background-color: var(--secondary);
  color: white;
  padding: var(--spacing-md) var(--spacing-lg);
  margin-bottom: var(--spacing-md);
}

.create-course-btn:hover {
  background-color: #059669;
}

/* ===== LISTS & CARDS ===== */
ul, ol {
  margin-left: var(--spacing-lg);
  margin-bottom: var(--spacing-md);
  color: var(--text-muted);
}

li {
  margin-bottom: var(--spacing-md);
  background-color: rgba(59, 130, 246, 0.05);
  border: 1px solid var(--border);
  border-left: 4px solid var(--primary);
  border-radius: var(--radius-md);
  padding: var(--spacing-lg);
  transition: all 0.2s ease;
}

li:hover {
  box-shadow: var(--shadow-md);
  border-left-color: var(--accent);
  background-color: rgba(59, 130, 246, 0.1);
}

li strong {
  color: var(--primary);
  display: block;
  margin-bottom: var(--spacing-sm);
  font-size: 1.125rem;
}

li p {
  color: var(--text-muted);
  margin-bottom: var(--spacing-sm);
  font-size: 0.95rem;
}

li button {
  margin-right: var(--spacing-sm);
  margin-bottom: var(--spacing-sm);
  background-color: var(--primary);
  color: white;
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: 0.9rem;
}

li button:hover {
  background-color: #2563eb;
}

/* ===== MODALS ===== */
.modal {
  display: none;
  position: fixed;
  z-index: 1000;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.7);
  animation: fadeIn 0.2s ease;
}

.modal-content {
  background-color: var(--bg-card);
  margin: 5% auto;
  padding: var(--spacing-xl);
  border-radius: var(--radius-lg);
  width: 90%;
  max-width: 600px;
  box-shadow: var(--shadow-xl);
  animation: slideIn 0.3s ease;
  border: 1px solid var(--border);
}

/* ===== PAGE TRANSITION ANIMATIONS ===== */
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes slideIn {
  from { transform: translateY(-50px); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}

@keyframes pageTransitionIn {
  0% {
    opacity: 0;
    transform: translateY(20px);
  }
  100% {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes pageTransitionOut {
  0% {
    opacity: 1;
    transform: translateY(0);
  }
  100% {
    opacity: 0;
    transform: translateY(-20px);
  }
}

/* ===== WAVE TRANSITION ANIMATIONS ===== */
@keyframes waveTransition {
  0% {
    clip-path: polygon(0 0, 0 0, 0 100%, 0 100%);
  }
  50% {
    clip-path: polygon(0 0, 100% 0, 100% 100%, 0 100%);
  }
  100% {
    clip-path: polygon(100% 0, 100% 0, 100% 100%, 100% 100%);
  }
}

@keyframes wavePulse {
  0% {
    transform: scaleY(1);
    opacity: 1;
  }
  50% {
    transform: scaleY(1.1);
    opacity: 0.8;
  }
  100% {
    transform: scaleY(1);
    opacity: 0;
  }
}

@keyframes particleBurst {
  0% {
    transform: translate(0, 0) scale(1);
    opacity: 1;
  }
  100% {
    transform: translate(var(--tx), var(--ty)) scale(0);
    opacity: 0;
  }
}

@keyframes pageGlowFlash {
  0% {
    background-color: rgba(59, 130, 246, 0);
  }
  40% {
    background-color: rgba(59, 130, 246, 0.15);
  }
  100% {
    background-color: rgba(59, 130, 246, 0);
  }
}

@keyframes contentFadeInScale {
  0% {
    opacity: 0;
    transform: scale(0.95) translateY(10px);
  }
  100% {
    opacity: 1;
    transform: scale(1) translateY(0);
  }
}

@keyframes headerSlideDown {
  0% {
    opacity: 0;
    transform: translateY(-30px);
  }
  100% {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes cardStaggerIn {
  0% {
    opacity: 0;
    transform: translateY(20px) rotateX(10deg);
  }
  100% {
    opacity: 1;
    transform: translateY(0) rotateX(0deg);
  }
}

@keyframes buttonGlowPulse {
  0%, 100% {
    box-shadow: 0 0 10px rgba(59, 130, 246, 0.3);
  }
  50% {
    box-shadow: 0 0 20px rgba(59, 130, 246, 0.6), 0 0 30px rgba(6, 182, 212, 0.3);
  }
}

/* ===== EPIC BATTLE ANIMATIONS ===== */
@keyframes battleFlash {
  0%, 100% { background-color: transparent; }
  10% { background-color: rgba(239, 68, 68, 0.6); }
  20% { background-color: rgba(59, 130, 246, 0.6); }
  30% { background-color: rgba(239, 68, 68, 0.6); }
  40% { background-color: rgba(59, 130, 246, 0.6); }
  50% { background-color: rgba(16, 185, 129, 0.5); }
}

@keyframes monsterAppear {
  0% {
    opacity: 0;
    transform: translateX(200px) scale(0.5);
  }
  60% {
    transform: translateX(-10px) scale(1);
  }
  100% {
    opacity: 1;
    transform: translateX(0) scale(1);
  }
}

@keyframes heroAttack {
  0% { transform: translateX(0) scale(1); }
  30% { transform: translateX(100px) scale(1.1); }
  60% { transform: translateX(150px) scale(1); }
  100% { transform: translateX(0) scale(1); }
}

@keyframes monsterHit {
  0% { transform: translateX(0) scale(1); }
  20% { transform: translateX(-40px) scale(0.95); opacity: 1; }
  40% { transform: translateX(-80px) scale(0.9); }
  100% { transform: translateX(0) scale(1); opacity: 0.7; }
}

@keyframes energyBlast {
  0% {
    opacity: 1;
    transform: translateX(0) scaleX(1);
  }
  100% {
    opacity: 0;
    transform: translateX(150px) scaleX(2);
  }
}

@keyframes victoryGlow {
  0% { opacity: 0; transform: scale(0); }
  50% { opacity: 1; transform: scale(1); }
  100% { opacity: 0; transform: scale(1.2); }
}

@keyframes textSlideIn {
  0% { opacity: 0; transform: translateY(30px); }
  100% { opacity: 1; transform: translateY(0); }
}

@keyframes sceneWipeOut {
  0% { clip-path: polygon(0 0, 100% 0, 100% 100%, 0 100%); }
  100% { clip-path: polygon(100% 0, 100% 0, 100% 100%, 100% 100%); }
}

/* ===== EPIC BATTLE COMBAT ANIMATIONS ===== */
@keyframes heroSwordSwing {
  0% { transform: translateY(-50%) rotate(0deg) scaleX(1); }
  40% { transform: translateY(-50%) rotate(-20deg) scaleX(1.1); }
  100% { transform: translateY(-50%) rotate(0deg) scaleX(1); }
}

@keyframes monsterHitReact {
  0% { transform: translateY(-50%) scaleX(1); }
  20% { transform: translateY(-50%) scaleX(0.9) translateX(-20px); }
  40% { transform: translateY(-50%) scaleX(0.85) translateX(-40px); }
  100% { transform: translateY(-50%) scaleX(1) translateX(0); }
}

@keyframes heroHitReact {
  0% { transform: translateY(-50%) scaleX(1); }
  20% { transform: translateY(-50%) scaleX(0.9) translateX(20px); }
  40% { transform: translateY(-50%) scaleX(0.85) translateX(40px); }
  100% { transform: translateY(-50%) scaleX(1) translateX(0); }
}

@keyframes monsterAttack {
  0% { transform: translateY(-50%) translateX(0) rotate(0deg); }
  40% { transform: translateY(-50%) translateX(-150px) rotate(-15deg) scaleX(1.1); }
  100% { transform: translateY(-50%) translateX(0) rotate(0deg) scaleX(1); }
}

@keyframes slashAttack {
  0% { 
    opacity: 1;
    transform: translateX(0) scale(0.5);
  }
  100% {
    opacity: 0;
    transform: translateX(300px) scale(2);
  }
}

@keyframes slashAttackReverse {
  0% { 
    opacity: 1;
    transform: translateX(0) scale(0.5);
  }
  100% {
    opacity: 0;
    transform: translateX(-300px) scale(2);
  }
}

@keyframes damageFloat {
  0% {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
  100% {
    opacity: 0;
    transform: translateY(-60px) scale(0.5);
  }
}

@keyframes monsterDefeated {
  0% { 
    opacity: 1;
    transform: translateY(-50%) scale(1) rotate(0deg);
  }
  100% { 
    opacity: 0;
    transform: translateY(100px) scale(0) rotate(360deg);
  }
}

@keyframes heroVictoryPose {
  0% { 
    transform: translateY(-50%) scale(1);
    filter: drop-shadow(0 0 20px rgba(74, 222, 128, 0.8));
  }
  50% { 
    transform: translateY(-50%) scale(1.2) rotate(10deg);
    filter: drop-shadow(0 0 30px rgba(74, 222, 128, 1));
  }
  100% { 
    transform: translateY(-50%) scale(1);
    filter: drop-shadow(0 0 20px rgba(74, 222, 128, 0.8));
  }
}

@keyframes explosionBurst {
  0% {
    opacity: 1;
    transform: translate(0, 0) scale(1);
  }
  100% {
    opacity: 0;
    transform: translate(var(--tx), var(--ty)) scale(0);
  }
}

@keyframes celebration {
  0% {
    opacity: 1;
    transform: translate(0, 0) scale(1);
  }
  100% {
    opacity: 0;
    transform: translate(var(--tx), var(--ty)) scale(0.2);
  }
}

@keyframes victoryAppear {
  0% {
    opacity: 0;
    transform: translate(-50%, -50%) scale(0) rotate(-30deg);
  }
  50% {
    opacity: 1;
    transform: translate(-50%, -50%) scale(1.2) rotate(5deg);
  }
  100% {
    opacity: 1;
    transform: translate(-50%, -50%) scale(1) rotate(0deg);
  }
}

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

@keyframes wave {
  0% { transform: translateX(0); }
  100% { transform: translateX(100%); }
}

@keyframes float {
  0% {
    bottom: -20px;
    opacity: 0;
  }
  10% {
    opacity: 1;
  }
  90% {
    opacity: 1;
  }
  100% {
    bottom: 500px;
    opacity: 0;
  }
}

@keyframes sway {
  0%, 100% { transform: translateX(0) rotateZ(0deg); }
  50% { transform: translateX(5px) rotateZ(2deg); }
}

@keyframes twinkle {
  0%, 100% { opacity: 0.3; }
  50% { opacity: 1; }
}

@keyframes fadeOut {
  from { opacity: 1; }
  to { opacity: 0; }
}

/* ===== AURORA ANIMATION ===== */
@keyframes aurora {
  0% {
    background-position: 0% 50%;
  }
  50% {
    background-position: 100% 50%;
  }
  100% {
    background-position: 0% 50%;
  }
}

@keyframes auroraGlow1 {
  0%, 100% {
    opacity: 0.3;
    transform: translateX(-100%);
  }
  50% {
    opacity: 0.8;
    transform: translateX(100%);
  }
}

@keyframes auroraGlow2 {
  0%, 100% {
    opacity: 0.2;
    transform: translateX(100%);
  }
  50% {
    opacity: 0.6;
    transform: translateX(-100%);
  }
}

@keyframes auroraGlow3 {
  0%, 100% {
    opacity: 0.25;
    transform: translateX(-50%);
  }
  50% {
    opacity: 0.7;
    transform: translateX(50%);
  }
}

.aurora-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 999;
  overflow: hidden;
}

.aurora-light {
  position: absolute;
  width: 100%;
  height: 100%;
  opacity: 0;
}

.aurora-light-1 {
  background: linear-gradient(
    to right,
    transparent 0%,
    rgba(59, 130, 246, 0.25) 40%,
    rgba(6, 182, 212, 0.2) 60%,
    transparent 100%
  );
  top: 5%;
  left: 0;
  opacity: 0.6;
}

.aurora-light-2 {
  background: linear-gradient(
    to right,
    transparent 0%,
    rgba(16, 185, 129, 0.15) 35%,
    rgba(59, 130, 246, 0.12) 65%,
    transparent 100%
  );
  top: 30%;
  left: 0;
  opacity: 0.4;
}

.aurora-light-3 {
  background: linear-gradient(
    to right,
    transparent 0%,
    rgba(245, 158, 11, 0.15) 50%,
    rgba(6, 182, 212, 0.15) 50%,
    transparent 100%
  );
  top: 55%;
  left: 0;
  opacity: 0.3;
}

.page-transition-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    135deg,
    rgba(59, 130, 246, 0.2) 0%,
    rgba(6, 182, 212, 0.15) 50%,
    rgba(16, 185, 129, 0.2) 100%
  );
  background-size: 200% 200%;
  animation: aurora 3s ease-in-out 1;
  pointer-events: none;
  z-index: 998;
}

/* ===== WAVE TRANSITION OVERLAY ===== */
.wave-transition-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    90deg,
    rgba(59, 130, 246, 0.8) 0%,
    rgba(6, 182, 212, 0.6) 50%,
    rgba(16, 185, 129, 0.8) 100%
  );
  pointer-events: none;
  z-index: 997;
  animation: waveTransition 1.2s cubic-bezier(0.77, 0, 0.175, 1) forwards;
}

/* ===== WAVE PULSE BARS ===== */
.wave-bar {
  position: fixed;
  left: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(59, 130, 246, 0.8),
    rgba(6, 182, 212, 0.8),
    transparent
  );
  pointer-events: none;
  z-index: 996;
}

/* ===== PARTICLE BURST CONTAINER ===== */
.particle-burst-container {
  position: fixed;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  pointer-events: none;
  z-index: 996;
}

.particle {
  position: absolute;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  pointer-events: none;
}

/* ===== PAGE GLOW FLASH ===== */
.page-glow-flash {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 995;
  animation: pageGlowFlash 0.8s ease-out forwards;
}

/* ===== CONTENT ANIMATIONS ===== */
section.transition-in-active {
  animation: contentFadeInScale 0.8s cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
}

section.transition-in-active h2 {
  animation: headerSlideDown 0.6s cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
}

.modal-content.transition-in-active {
  animation: contentFadeInScale 0.7s cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
}

/* ===== BATTLE SCENE CONTAINER ===== */
.battle-scene-container {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, #0f172a 0%, #1e293b 50%, #0f172a 100%);
  z-index: 1000;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 40px;
  pointer-events: none;
  overflow: hidden;
}

.battle-flash-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  animation: battleFlash 0.6s ease-in-out;
  pointer-events: none;
}

.hero-character {
  font-size: 80px;
  animation: heroAttack 0.8s ease-in-out;
  filter: drop-shadow(0 0 20px rgba(59, 130, 246, 0.6));
}

.monster-character {
  font-size: 80px;
  animation: monsterAppear 0.6s cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
  filter: drop-shadow(0 0 20px rgba(239, 68, 68, 0.8));
}

.energy-blast {
  position: absolute;
  width: 40px;
  height: 40px;
  background: radial-gradient(circle, rgba(59, 130, 246, 0.8), transparent);
  border-radius: 50%;
  left: 15%;
  top: 50%;
  animation: energyBlast 0.6s ease-out forwards;
}

.victory-star {
  position: absolute;
  font-size: 60px;
  animation: victoryGlow 0.8s ease-out forwards;
  filter: drop-shadow(0 0 10px rgba(245, 158, 11, 0.8));
}

.battle-text {
  position: absolute;
  font-size: 24px;
  font-weight: bold;
  color: #fbbf24;
  text-shadow: 0 0 10px rgba(245, 158, 11, 0.8);
  animation: textSlideIn 0.5s ease-out forwards;
  opacity: 0;
}

/* Animation preference button */
#animation-pref-btn {
  background: transparent;
  border: 2px solid var(--primary);
  color: var(--primary);
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all 0.3s ease;
  font-weight: 600;
}

#animation-pref-btn:hover {
  background-color: rgba(59, 130, 246, 0.1);
  box-shadow: 0 0 10px rgba(59, 130, 246, 0.4);
}

#animation-pref-btn.active {
  background-color: var(--primary);
  color: white;
  box-shadow: 0 0 15px rgba(59, 130, 246, 0.6);
}

/* ===== MOUSE-FOLLOWING AURORA BALL ===== */
.aurora-ball {
  position: fixed;
  width: 400px;
  height: 400px;
  pointer-events: none;
  z-index: 10;
  filter: blur(80px);
  margin-left: -200px;
  margin-top: -200px;
}

.aurora-ball::before {
  content: '';
  position: absolute;
  width: 100%;
  height: 100%;
  background: radial-gradient(
    circle at 30% 30%,
    rgba(59, 130, 246, 0.4) 0%,
    rgba(59, 130, 246, 0.3) 20%,
    rgba(6, 182, 212, 0.2) 40%,
    rgba(16, 185, 129, 0.15) 60%,
    transparent 80%
  );
  border-radius: 50%;
  opacity: 0.8;
}

/* Apply transition animation to page sections */
section.page-transition-in {
  animation: pageTransitionIn 0.6s cubic-bezier(0.34, 1.56, 0.64, 1);
}

section.page-transition-out {
  animation: pageTransitionOut 0.4s ease-out;
}

.close-modal {
  float: right;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--text-muted);
  background: none;
  border: none;
  padding: 0;
  transition: color 0.2s ease;
}

.close-modal:hover {
  color: var(--text-light);
}

/* ===== COURSE EDITOR ===== */
.editor-toolbar {
  display: flex;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
  padding-bottom: var(--spacing-lg);
  border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
}

.editor-toolbar button {
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: 0.9rem;
}

#course-content-editor {
  min-height: 400px;
  padding: var(--spacing-lg);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background-color: var(--bg-input);
  color: var(--text-light);
  font-family: var(--font-sans);
  line-height: 1.8;
}

/* ===== QUIZ STYLES ===== */
.quiz-modal {
  max-width: 600px;
}

.quiz-question {
  background-color: rgba(59, 130, 246, 0.05);
  border: 1px solid var(--border);
  border-left: 4px solid var(--primary);
  border-radius: var(--radius-md);
  padding: var(--spacing-lg);
  margin-bottom: var(--spacing-md);
  transition: all 0.2s ease;
}

.quiz-question:hover {
  box-shadow: var(--shadow-md);
  border-left-color: var(--accent);
  background-color: rgba(59, 130, 246, 0.1);
}

.quiz-question-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-md);
}

.quiz-question-text {
  font-size: 1.1rem;
  color: var(--text-light);
  margin-bottom: var(--spacing-md);
  font-weight: 600;
}

.quiz-points {
  background-color: var(--info);
  color: white;
  padding: var(--spacing-xs) var(--spacing-md);
  border-radius: 9999px;
  font-size: 0.85rem;
  font-weight: 600;
}

.quiz-options {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
  margin: var(--spacing-md) 0;
}

.quiz-option {
  background-color: var(--bg-input);
  border: 2px solid var(--border);
  border-radius: var(--radius-md);
  padding: var(--spacing-md);
  cursor: pointer;
  transition: all 0.2s ease;
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.quiz-option:hover {
  border-color: var(--primary);
  background-color: rgba(59, 130, 246, 0.1);
}

.quiz-option input[type="radio"] {
  width: 20px;
  height: 20px;
  cursor: pointer;
  accent-color: var(--primary);
}

.quiz-option label {
  cursor: pointer;
  flex: 1;
  margin: 0;
  color: var(--text-light);
}

.quiz-submit-btn {
  background-color: var(--success);
  color: white;
  padding: var(--spacing-md) var(--spacing-lg);
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  font-weight: 600;
  margin-top: var(--spacing-md);
  transition: all 0.2s ease;
}

.quiz-submit-btn:hover {
  background-color: #059669;
  box-shadow: 0 0 20px rgba(16, 185, 129, 0.3);
}

.quiz-submit-btn:disabled {
  background-color: var(--border);
  cursor: not-allowed;
}

.quiz-feedback {
  margin-top: var(--spacing-md);
  padding: var(--spacing-md);
  border-radius: var(--radius-md);
  font-weight: 600;
  border-left: 4px solid transparent;
}

.quiz-feedback.correct {
  background-color: rgba(16, 185, 129, 0.15);
  border-left-color: var(--success);
  color: #86efac;
}

.quiz-feedback.incorrect {
  background-color: rgba(239, 68, 68, 0.15);
  border-left-color: var(--danger);
  color: #fca5a5;
}

.quiz-explanation {
  margin-top: var(--spacing-md);
  padding-top: var(--spacing-md);
  border-top: 1px solid var(--border);
  font-weight: normal;
  font-style: italic;
  color: var(--text-muted);
}

.quiz-score-display {
  background: linear-gradient(135deg, var(--primary), #1e40af);
  color: white;
  padding: var(--spacing-lg);
  border-radius: var(--radius-lg);
  text-align: center;
  font-size: 1.25rem;
  font-weight: 700;
  margin: var(--spacing-lg) 0;
  box-shadow: 0 0 30px rgba(59, 130, 246, 0.3);
}

/* ===== LATEX & EQUATIONS ===== */
.latex-equation {
  display: inline;
  padding: 0;
  background: transparent;
  font-style: italic;
  color: var(--text-light);
}

#latex-preview {
  text-align: center;
  min-height: 80px;
  padding: var(--spacing-lg);
  background-color: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  margin: var(--spacing-md) 0;
  color: var(--text-light);
}

.latex-snippet-btn,
.latex-template-btn {
  padding: var(--spacing-sm) var(--spacing-md);
  background-color: rgba(59, 130, 246, 0.1);
  color: var(--primary);
  border: 1px solid var(--primary);
  border-radius: var(--radius-md);
  cursor: pointer;
  font-size: 0.9rem;
  font-weight: 500;
  transition: all 0.2s ease;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.latex-snippet-btn:hover,
.latex-template-btn:hover {
  background-color: var(--primary);
  color: white;
  box-shadow: 0 0 15px rgba(59, 130, 246, 0.3);
}

/* ===== STATUS BADGES ===== */
.status-badge {
  display: inline-block;
  padding: var(--spacing-xs) var(--spacing-md);
  border-radius: 9999px;
  font-size: 0.85rem;
  font-weight: 600;
}

.status-pending {
  background-color: rgba(245, 158, 11, 0.2);
  color: #fbbf24;
}

.status-approved {
  background-color: rgba(16, 185, 129, 0.2);
  color: #6ee7b7;
}

.status-rejected {
  background-color: rgba(239, 68, 68, 0.2);
  color: #fca5a5;
}

/* ===== RESPONSIVE DESIGN ===== */
@media (max-width: 768px) {
  header {
    flex-direction: column;
    gap: var(--spacing-md);
  }

  header nav {
    width: 100%;
    justify-content: center;
  }

  main {
    padding: var(--spacing-lg);
  }

  section {
    padding: var(--spacing-lg);
  }

  section h2 {
    font-size: 1.5rem;
  }

  #landing-page h1 {
    font-size: 2rem;
  }

  .modal-content {
    width: 95%;
    margin: 20% auto;
  }

  .editor-toolbar {
    flex-direction: column;
  }

  .editor-toolbar button {
    width: 100%;
  }

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

@media (max-width: 480px) {
  header h1 {
    font-size: 1.5rem;
  }

  section {
    padding: var(--spacing-md);
  }

  main {
    padding: var(--spacing-md);
  }

  button, .btn {
    width: 100%;
  }

  #landing-page h1 {
    font-size: 1.5rem;
  }

  #landing-page p {
    font-size: 1rem;
  }

  .landing-buttons {
    flex-direction: column;
  }

  .landing-buttons button {
    width: 100%;
  }
}

/* ===== ACCESSIBILITY ===== */
a:focus,
button:focus,
input:focus,
textarea:focus,
select:focus {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

/* ===== UTILITY CLASSES ===== */
.text-center {
  text-align: center;
}

.text-muted {
  color: var(--text-muted);
  font-size: 0.9rem;
}

.mt-1 { margin-top: var(--spacing-sm); }
.mt-2 { margin-top: var(--spacing-md); }
.mt-3 { margin-top: var(--spacing-lg); }
.mb-1 { margin-bottom: var(--spacing-sm); }
.mb-2 { margin-bottom: var(--spacing-md); }
.mb-3 { margin-bottom: var(--spacing-lg); }

.alert {
  padding: var(--spacing-md);
  border-radius: var(--radius-md);
  border-left: 4px solid transparent;
  margin-bottom: var(--spacing-md);
}

.alert-success {
  background-color: rgba(16, 185, 129, 0.15);
  border-left-color: var(--success);
  color: #6ee7b7;
}

.alert-danger {
  background-color: rgba(239, 68, 68, 0.15);
  border-left-color: var(--danger);
  color: #fca5a5;
}

.alert-info {
  background-color: rgba(6, 182, 212, 0.15);
  border-left-color: var(--info);
  color: #67e8f9;
}