/* ============================================
   DESIGN SYSTEM - Savia
   ============================================ */

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

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

body {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--color-gray-900);
  background-color: var(--color-white);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ---------- CSS Variables ---------- */
:root {
  /* Primary Colors */
  --color-navy: #060E37;
  --color-navy-light: #0D1847;
  --color-teal: #0D7377;
  --color-teal-light: #14A3A8;
  --color-teal-dark: #095456;

  /* Accent Colors */
  --color-gold: #FBC600;
  --color-gold-light: #FFD84D;
  --color-coral: #F8B62D;
  --color-purple: #944BEB;

  /* Neutrals */
  --color-white: #FFFFFF;
  --color-gray-50: #FAFAFA;
  --color-gray-100: #F7F7F7;
  --color-gray-200: #EEEEEE;
  --color-gray-300: #E0E0E0;
  --color-gray-400: #BDBDBD;
  --color-gray-500: #9E9E9E;
  --color-gray-600: #666666;
  --color-gray-700: #4A4A4A;
  --color-gray-800: #333333;
  --color-gray-900: #1A1A1A;

  /* Semantic Colors */
  --color-success: #28A745;
  --color-success-light: #D4EDDA;
  --color-warning: #FFC107;
  --color-warning-light: #FFF3CD;
  --color-error: #DC3545;
  --color-error-light: #F8D7DA;
  --color-info: #17A2B8;
  --color-info-light: #D1ECF1;

  /* Typography */
  --font-heading: 'Raleway', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-body: 'Lato', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;

  /* Font Sizes */
  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 1.875rem;
  --text-4xl: 2.25rem;
  --text-5xl: 3rem;
  --text-6xl: 3.75rem;

  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;

  /* Border Radius */
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 350ms ease;

  /* Container */
  --container-sm: 640px;
  --container-md: 768px;
  --container-lg: 1024px;
  --container-xl: 1280px;
  --container-2xl: 1440px;

  /* Header Height */
  --header-height: 72px;
}

/* ---------- Typography ---------- */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.2;
  color: var(--color-navy);
}

h1 { font-size: var(--text-5xl); margin-bottom: var(--space-6); }
h2 { font-size: var(--text-4xl); margin-bottom: var(--space-5); }
h3 { font-size: var(--text-3xl); margin-bottom: var(--space-4); }
h4 { font-size: var(--text-2xl); margin-bottom: var(--space-4); }
h5 { font-size: var(--text-xl); margin-bottom: var(--space-3); }
h6 { font-size: var(--text-lg); margin-bottom: var(--space-3); }

p {
  margin-bottom: var(--space-4);
}

a {
  color: var(--color-teal);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-teal-dark);
}

strong { font-weight: 700; }
em { font-style: italic; }

.text-sm { font-size: var(--text-sm); }
.text-lg { font-size: var(--text-lg); }
.text-xl { font-size: var(--text-xl); }
.text-center { text-align: center; }
.text-muted { color: var(--color-gray-600); }

/* ---------- Layout ---------- */
.container {
  width: 100%;
  max-width: var(--container-xl);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.container-sm { max-width: var(--container-sm); }
.container-md { max-width: var(--container-md); }
.container-lg { max-width: var(--container-lg); }

main {
  flex: 1;
}

.section {
  padding: var(--space-20) 0;
}

.section-sm {
  padding: var(--space-12) 0;
}

.section-lg {
  padding: var(--space-24) 0;
}

/* ---------- Grid ---------- */
.grid {
  display: grid;
  gap: var(--space-6);
}

.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

@media (max-width: 1024px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .grid-4, .grid-3, .grid-2 { grid-template-columns: 1fr; }
}

/* ---------- Flexbox Utilities ---------- */
.flex { display: flex; }
.flex-col { flex-direction: column; }
.flex-wrap { flex-wrap: wrap; }
.items-center { align-items: center; }
.items-start { align-items: flex-start; }
.items-end { align-items: flex-end; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.justify-end { justify-content: flex-end; }
.gap-2 { gap: var(--space-2); }
.gap-4 { gap: var(--space-4); }
.gap-6 { gap: var(--space-6); }
.gap-8 { gap: var(--space-8); }

/* ---------- Header ---------- */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background: var(--color-white);
  border-bottom: 1px solid var(--color-gray-200);
  z-index: 1000;
  transition: box-shadow var(--transition-base);
}

.header.scrolled {
  box-shadow: var(--shadow-md);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  max-width: var(--container-xl);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-navy);
  text-decoration: none;
}

.logo-icon {
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, var(--color-teal) 0%, var(--color-navy) 100%);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-white);
  font-weight: 700;
}

.nav {
  display: flex;
  align-items: center;
  gap: var(--space-8);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-6);
  list-style: none;
}

.nav-link {
  font-size: var(--text-base);
  font-weight: 500;
  color: var(--color-gray-700);
  transition: color var(--transition-fast);
  padding: var(--space-2) 0;
  position: relative;
}

.nav-link:hover,
.nav-link.active {
  color: var(--color-teal);
}

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--color-teal);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

/* Mobile Menu Toggle */
.mobile-menu-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-2);
}

.mobile-menu-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-navy);
  margin: 5px 0;
  transition: var(--transition-fast);
}

@media (max-width: 768px) {
  .nav {
    display: none;
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: var(--color-white);
    flex-direction: column;
    padding: var(--space-6);
    border-bottom: 1px solid var(--color-gray-200);
    box-shadow: var(--shadow-lg);
  }

  .nav.open {
    display: flex;
  }

  .nav-links {
    flex-direction: column;
    width: 100%;
  }

  .nav-link {
    padding: var(--space-3) 0;
    width: 100%;
  }

  .nav-actions {
    width: 100%;
    flex-direction: column;
  }

  .nav-actions .btn {
    width: 100%;
  }

  .mobile-menu-toggle {
    display: block;
  }
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: 600;
  text-decoration: none;
  border: 2px solid transparent;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.btn:focus {
  outline: none;
  box-shadow: 0 0 0 3px rgba(13, 115, 119, 0.3);
}

.btn-primary {
  background: var(--color-teal);
  color: var(--color-white);
  border-color: var(--color-teal);
}

.btn-primary:hover {
  background: var(--color-teal-dark);
  border-color: var(--color-teal-dark);
  color: var(--color-white);
}

.btn-secondary {
  background: var(--color-navy);
  color: var(--color-white);
  border-color: var(--color-navy);
}

.btn-secondary:hover {
  background: var(--color-navy-light);
  border-color: var(--color-navy-light);
  color: var(--color-white);
}

.btn-outline {
  background: transparent;
  color: var(--color-teal);
  border-color: var(--color-teal);
}

.btn-outline:hover {
  background: var(--color-teal);
  color: var(--color-white);
}

.btn-ghost {
  background: transparent;
  color: var(--color-gray-700);
  border-color: transparent;
}

.btn-ghost:hover {
  background: var(--color-gray-100);
  color: var(--color-navy);
}

.btn-lg {
  padding: var(--space-4) var(--space-8);
  font-size: var(--text-lg);
}

.btn-sm {
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-sm);
}

.btn-block {
  width: 100%;
}

/* ---------- Hero Section ---------- */
.hero {
  padding-top: calc(var(--header-height) + var(--space-16));
  padding-bottom: var(--space-20);
  background: linear-gradient(135deg, var(--color-gray-50) 0%, var(--color-white) 100%);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 60%;
  height: 150%;
  background: linear-gradient(135deg, rgba(13, 115, 119, 0.05) 0%, rgba(6, 14, 55, 0.03) 100%);
  border-radius: 50%;
  transform: rotate(-15deg);
}

.hero-content {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-12);
  align-items: center;
}

.hero-text h1 {
  font-size: var(--text-5xl);
  margin-bottom: var(--space-6);
  color: var(--color-navy);
}

.hero-text h1 span {
  color: var(--color-teal);
}

.hero-text p {
  font-size: var(--text-xl);
  color: var(--color-gray-600);
  margin-bottom: var(--space-8);
  max-width: 540px;
}

.hero-actions {
  display: flex;
  gap: var(--space-4);
  flex-wrap: wrap;
}

.hero-image {
  position: relative;
}

.hero-image img {
  width: 100%;
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
}

@media (max-width: 1024px) {
  .hero-content {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .hero-text p {
    max-width: 100%;
  }

  .hero-actions {
    justify-content: center;
  }

  .hero-image {
    max-width: 600px;
    margin: 0 auto;
  }
}

@media (max-width: 768px) {
  .hero-text h1 {
    font-size: var(--text-4xl);
  }

  .hero-text p {
    font-size: var(--text-lg);
  }
}

/* ---------- Section Headers ---------- */
.section-header {
  text-align: center;
  max-width: 700px;
  margin: 0 auto var(--space-12);
}

.section-header h2 {
  margin-bottom: var(--space-4);
}

.section-header p {
  font-size: var(--text-lg);
  color: var(--color-gray-600);
}

.section-label {
  display: inline-block;
  font-size: var(--text-sm);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-teal);
  margin-bottom: var(--space-3);
}

/* ---------- Cards ---------- */
.card {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  box-shadow: var(--shadow-md);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.card-icon {
  width: 56px;
  height: 56px;
  background: linear-gradient(135deg, var(--color-teal-light) 0%, var(--color-teal) 100%);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-4);
  color: var(--color-white);
  font-size: var(--text-2xl);
}

.card h3 {
  font-size: var(--text-xl);
  margin-bottom: var(--space-3);
}

.card p {
  color: var(--color-gray-600);
  margin-bottom: 0;
}

/* Course Card */
.course-card {
  display: flex;
  flex-direction: column;
  height: 100%;
}

.course-card-image {
  position: relative;
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
  overflow: hidden;
  aspect-ratio: 16 / 9;
}

.course-card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.course-card:hover .course-card-image img {
  transform: scale(1.05);
}

.course-card-badge {
  position: absolute;
  top: var(--space-3);
  left: var(--space-3);
  background: var(--color-navy);
  color: var(--color-white);
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
}

.course-card-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  padding: var(--space-5);
}

.course-card-path {
  font-size: var(--text-sm);
  color: var(--color-teal);
  font-weight: 600;
  margin-bottom: var(--space-2);
}

.course-card h3 {
  font-size: var(--text-lg);
  margin-bottom: var(--space-3);
}

.course-card p {
  flex: 1;
  font-size: var(--text-sm);
  color: var(--color-gray-600);
}

.course-card-meta {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  margin-top: var(--space-4);
  padding-top: var(--space-4);
  border-top: 1px solid var(--color-gray-200);
  font-size: var(--text-sm);
  color: var(--color-gray-500);
}

.course-card-meta span {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

/* ---------- Features Section ---------- */
.features {
  background: var(--color-gray-50);
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-8);
}

@media (max-width: 1024px) {
  .feature-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .feature-grid {
    grid-template-columns: 1fr;
  }
}

/* ---------- Stats Section ---------- */
.stats {
  background: var(--color-navy);
  color: var(--color-white);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-8);
  text-align: center;
}

.stat-item h3 {
  font-size: var(--text-5xl);
  color: var(--color-gold);
  margin-bottom: var(--space-2);
}

.stat-item p {
  font-size: var(--text-lg);
  color: var(--color-gray-300);
  margin: 0;
}

@media (max-width: 1024px) {
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .stats-grid {
    grid-template-columns: 1fr;
  }

  .stat-item h3 {
    font-size: var(--text-4xl);
  }
}

/* ---------- Learning Paths Section ---------- */
.learning-path-card {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  padding: var(--space-8);
  border: 2px solid var(--color-gray-200);
  transition: border-color var(--transition-base), box-shadow var(--transition-base);
}

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

.learning-path-icon {
  width: 72px;
  height: 72px;
  background: linear-gradient(135deg, var(--color-teal-light) 0%, var(--color-teal) 100%);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-5);
  font-size: var(--text-3xl);
}

.learning-path-card h3 {
  margin-bottom: var(--space-3);
}

.learning-path-card p {
  color: var(--color-gray-600);
  margin-bottom: var(--space-5);
}

.learning-path-modules {
  font-size: var(--text-sm);
  color: var(--color-gray-500);
  margin-bottom: var(--space-5);
}

/* ---------- Testimonials ---------- */
.testimonial-card {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  padding: var(--space-8);
  box-shadow: var(--shadow-md);
}

.testimonial-text {
  font-size: var(--text-lg);
  font-style: italic;
  color: var(--color-gray-700);
  margin-bottom: var(--space-6);
  position: relative;
}

.testimonial-text::before {
  content: '"';
  font-size: var(--text-6xl);
  color: var(--color-teal-light);
  position: absolute;
  top: -20px;
  left: -10px;
  font-family: Georgia, serif;
  line-height: 1;
  opacity: 0.3;
}

.testimonial-author {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.testimonial-avatar {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-full);
  background: var(--color-gray-200);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: var(--color-teal);
}

.testimonial-info h4 {
  font-size: var(--text-base);
  margin-bottom: var(--space-1);
}

.testimonial-info p {
  font-size: var(--text-sm);
  color: var(--color-gray-500);
  margin: 0;
}

/* ---------- CTA Section ---------- */
.cta {
  background: linear-gradient(135deg, var(--color-teal) 0%, var(--color-navy) 100%);
  color: var(--color-white);
  text-align: center;
}

.cta h2 {
  color: var(--color-white);
  margin-bottom: var(--space-4);
}

.cta p {
  font-size: var(--text-xl);
  opacity: 0.9;
  max-width: 600px;
  margin: 0 auto var(--space-8);
}

.cta .btn-primary {
  background: var(--color-gold);
  color: var(--color-navy);
  border-color: var(--color-gold);
}

.cta .btn-primary:hover {
  background: var(--color-gold-light);
  border-color: var(--color-gold-light);
}

/* ---------- Footer ---------- */
.footer {
  background: var(--color-navy);
  color: var(--color-gray-300);
  padding: var(--space-16) 0 var(--space-8);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-12);
  margin-bottom: var(--space-12);
}

.footer-brand {
  max-width: 300px;
}

.footer-brand .logo {
  color: var(--color-white);
  margin-bottom: var(--space-4);
}

.footer-brand p {
  font-size: var(--text-sm);
  line-height: 1.7;
}

.footer-column h4 {
  color: var(--color-white);
  font-size: var(--text-base);
  margin-bottom: var(--space-4);
}

.footer-links {
  list-style: none;
}

.footer-links li {
  margin-bottom: var(--space-2);
}

.footer-links a {
  color: var(--color-gray-400);
  font-size: var(--text-sm);
  transition: color var(--transition-fast);
}

.footer-links a:hover {
  color: var(--color-white);
}

.footer-bottom {
  padding-top: var(--space-8);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: var(--text-sm);
}

.footer-social {
  display: flex;
  gap: var(--space-4);
}

.footer-social a {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  background: rgba(255, 255, 255, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-gray-300);
  transition: background var(--transition-fast), color var(--transition-fast);
}

.footer-social a:hover {
  background: var(--color-teal);
  color: var(--color-white);
}

@media (max-width: 1024px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }

  .footer-brand {
    grid-column: span 2;
  }
}

@media (max-width: 768px) {
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .footer-brand {
    grid-column: 1;
  }

  .footer-bottom {
    flex-direction: column;
    gap: var(--space-4);
    text-align: center;
  }
}

/* ---------- Forms ---------- */
.form-group {
  margin-bottom: var(--space-5);
}

.form-label {
  display: block;
  font-weight: 600;
  margin-bottom: var(--space-2);
  color: var(--color-gray-700);
}

.form-input,
.form-textarea,
.form-select {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  font-family: var(--font-body);
  font-size: var(--text-base);
  border: 2px solid var(--color-gray-300);
  border-radius: var(--radius-md);
  background: var(--color-white);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
  outline: none;
  border-color: var(--color-teal);
  box-shadow: 0 0 0 3px rgba(13, 115, 119, 0.1);
}

.form-textarea {
  min-height: 120px;
  resize: vertical;
}

.form-hint {
  font-size: var(--text-sm);
  color: var(--color-gray-500);
  margin-top: var(--space-1);
}

.form-error {
  font-size: var(--text-sm);
  color: var(--color-error);
  margin-top: var(--space-1);
}

/* ---------- Alerts ---------- */
.alert {
  padding: var(--space-4) var(--space-5);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-4);
}

.alert-success {
  background: var(--color-success-light);
  color: var(--color-success);
  border: 1px solid var(--color-success);
}

.alert-error {
  background: var(--color-error-light);
  color: var(--color-error);
  border: 1px solid var(--color-error);
}

.alert-warning {
  background: var(--color-warning-light);
  color: var(--color-gray-800);
  border: 1px solid var(--color-warning);
}

.alert-info {
  background: var(--color-info-light);
  color: var(--color-info);
  border: 1px solid var(--color-info);
}

/* ---------- Badges ---------- */
.badge {
  display: inline-block;
  padding: var(--space-1) var(--space-3);
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  border-radius: var(--radius-full);
}

.badge-primary {
  background: var(--color-teal);
  color: var(--color-white);
}

.badge-secondary {
  background: var(--color-navy);
  color: var(--color-white);
}

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

.badge-warning {
  background: var(--color-warning);
  color: var(--color-gray-900);
}

/* ---------- Progress Bar ---------- */
.progress {
  height: 8px;
  background: var(--color-gray-200);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.progress-bar {
  height: 100%;
  background: linear-gradient(90deg, var(--color-teal) 0%, var(--color-teal-light) 100%);
  border-radius: var(--radius-full);
  transition: width var(--transition-slow);
}

/* ---------- Utility Classes ---------- */
.mt-0 { margin-top: 0; }
.mt-4 { margin-top: var(--space-4); }
.mt-8 { margin-top: var(--space-8); }
.mb-0 { margin-bottom: 0; }
.mb-4 { margin-bottom: var(--space-4); }
.mb-8 { margin-bottom: var(--space-8); }

.pt-0 { padding-top: 0; }
.pb-0 { padding-bottom: 0; }

.hidden { display: none; }
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

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

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

.animate-fade-in {
  animation: fadeIn var(--transition-slow) ease forwards;
}

.animate-slide-up {
  animation: slideUp var(--transition-slow) ease forwards;
}

/* ---------- Print Styles ---------- */
@media print {
  .header,
  .footer,
  .btn,
  .nav {
    display: none !important;
  }

  body {
    font-size: 12pt;
  }

  .hero {
    padding-top: 0;
  }
}

/* ============================================
   IMMERSIVE MODE - Course Player
   ============================================ */

/* ---------- Immersive Mode Base ---------- */
body.immersive-mode {
  overflow-x: hidden;
}

/* ---------- Immersive Header ---------- */
.immersive-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 56px;
  background: var(--color-navy);
  color: var(--color-white);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--space-4);
  z-index: 1000;
  box-shadow: var(--shadow-md);
}

.immersive-header-left,
.immersive-header-right {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.immersive-header-center {
  flex: 1;
  text-align: center;
  min-width: 0;
  padding: 0 var(--space-4);
}

.immersive-title {
  font-size: var(--text-base);
  font-weight: 600;
  color: var(--color-white);
  margin: 0;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* ---------- Immersive Header Buttons ---------- */
.immersive-back-btn,
.immersive-menu-btn,
.immersive-sidebar-btn {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: none;
  border-radius: var(--radius-md);
  color: var(--color-white);
  cursor: pointer;
  transition: background var(--transition-fast);
  text-decoration: none;
}

.immersive-back-btn:hover,
.immersive-menu-btn:hover,
.immersive-sidebar-btn:hover {
  background: rgba(255, 255, 255, 0.1);
  color: var(--color-white);
}

/* ---------- Immersive Header Progress ---------- */
.immersive-progress-wrapper {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.immersive-progress-text {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-gold);
  min-width: 36px;
}

.immersive-progress-bar {
  width: 100px;
  height: 6px;
  background: rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.immersive-progress-fill {
  height: 100%;
  background: var(--color-gold);
  border-radius: var(--radius-full);
  transition: width var(--transition-slow);
}

/* ---------- Immersive Main Content ---------- */
.immersive-main {
  padding-top: 56px;
  min-height: 100vh;
  background: var(--color-gray-900);
}

.immersive-content {
  width: 100%;
  height: calc(100vh - 56px);
  display: flex;
  align-items: center;
  justify-content: center;
}

.immersive-content iframe {
  width: 100%;
  height: 100%;
  border: none;
}

.immersive-content-placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: var(--color-white);
  text-align: center;
  padding: var(--space-8);
}

.immersive-content-placeholder svg {
  opacity: 0.5;
  margin-bottom: var(--space-4);
}

.immersive-content-placeholder h3 {
  color: var(--color-white);
  margin-bottom: var(--space-2);
}

.immersive-content-placeholder p {
  opacity: 0.7;
  margin: 0;
}

/* ---------- Immersive Sidebar ---------- */
.immersive-sidebar {
  position: fixed;
  top: 56px;
  right: 0;
  width: 320px;
  height: calc(100vh - 56px);
  background: var(--color-white);
  box-shadow: var(--shadow-xl);
  transform: translateX(100%);
  transition: transform var(--transition-base);
  z-index: 900;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.immersive-sidebar.open {
  transform: translateX(0);
}

.immersive-sidebar-header {
  padding: var(--space-4) var(--space-5);
  border-bottom: 1px solid var(--color-gray-200);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.immersive-sidebar-header h3 {
  margin: 0;
  font-size: var(--text-lg);
}

.immersive-sidebar-close {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: none;
  border-radius: var(--radius-md);
  color: var(--color-gray-600);
  cursor: pointer;
  transition: background var(--transition-fast);
}

.immersive-sidebar-close:hover {
  background: var(--color-gray-100);
}

.immersive-sidebar-content {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-4);
}

.immersive-sidebar-footer {
  padding: var(--space-4) var(--space-5);
  border-top: 1px solid var(--color-gray-200);
}

/* ---------- Module List in Sidebar ---------- */
.immersive-module-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.immersive-module-item {
  padding: var(--space-3);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-gray-200);
  display: flex;
  align-items: center;
  gap: var(--space-3);
  cursor: pointer;
  transition: all var(--transition-fast);
  background: var(--color-white);
}

.immersive-module-item:hover {
  border-color: var(--color-teal);
  background: var(--color-gray-50);
}

.immersive-module-item.active {
  border-color: var(--color-teal);
  background: var(--color-gray-50);
}

.immersive-module-number {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-full);
  background: var(--color-gray-100);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-weight: 600;
  font-size: var(--text-sm);
  color: var(--color-gray-600);
}

.immersive-module-item.active .immersive-module-number {
  background: var(--color-teal);
  color: var(--color-white);
}

.immersive-module-info {
  flex: 1;
  min-width: 0;
}

.immersive-module-title {
  font-size: var(--text-sm);
  font-weight: 600;
  margin: 0;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.immersive-module-duration {
  font-size: var(--text-xs);
  color: var(--color-gray-500);
}

.immersive-module-status {
  flex-shrink: 0;
}

/* ---------- Sidebar Course Meta ---------- */
.immersive-course-meta {
  padding-top: var(--space-4);
  border-top: 1px solid var(--color-gray-200);
  margin-top: var(--space-4);
}

.immersive-meta-row {
  display: flex;
  justify-content: space-between;
  margin-bottom: var(--space-2);
  font-size: var(--text-sm);
}

.immersive-meta-label {
  color: var(--color-gray-500);
}

.immersive-meta-value {
  font-weight: 500;
}

/* ---------- Sidebar Backdrop ---------- */
.immersive-sidebar-backdrop {
  position: fixed;
  top: 56px;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-base), visibility var(--transition-base);
  z-index: 850;
}

.immersive-sidebar-backdrop.visible {
  opacity: 1;
  visibility: visible;
}

/* ---------- Navigation Overlay ---------- */
.immersive-nav-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 2000;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-base), visibility var(--transition-base);
}

.immersive-nav-overlay.open {
  opacity: 1;
  visibility: visible;
}

.immersive-nav-backdrop {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(6, 14, 55, 0.95);
}

.immersive-nav-content {
  position: relative;
  z-index: 1;
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-8);
}

.immersive-nav-close {
  position: absolute;
  top: var(--space-4);
  right: var(--space-4);
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: none;
  border-radius: var(--radius-md);
  color: var(--color-white);
  cursor: pointer;
  transition: background var(--transition-fast);
}

.immersive-nav-close:hover {
  background: rgba(255, 255, 255, 0.1);
}

.immersive-nav-links {
  list-style: none;
  text-align: center;
  margin-bottom: var(--space-8);
}

.immersive-nav-links li {
  margin-bottom: var(--space-4);
}

.immersive-nav-links a {
  font-family: var(--font-heading);
  font-size: var(--text-2xl);
  font-weight: 600;
  color: var(--color-white);
  text-decoration: none;
  transition: color var(--transition-fast);
  display: inline-block;
  padding: var(--space-2) var(--space-4);
}

.immersive-nav-links a:hover {
  color: var(--color-gold);
}

.immersive-nav-footer {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-4);
}

.immersive-nav-user {
  font-size: var(--text-sm);
  color: var(--color-gray-400);
}

.immersive-nav-footer .btn {
  min-width: 150px;
}

/* ---------- Immersive Mobile Responsive ---------- */
@media (max-width: 768px) {
  .immersive-header {
    padding: 0 var(--space-3);
  }

  .immersive-title {
    font-size: var(--text-sm);
  }

  .immersive-progress-bar {
    width: 60px;
  }

  .immersive-progress-text {
    font-size: var(--text-xs);
  }

  .immersive-sidebar {
    width: 100%;
    max-width: 100%;
  }

  .immersive-nav-links a {
    font-size: var(--text-xl);
  }
}

@media (max-width: 480px) {
  .immersive-progress-wrapper {
    gap: var(--space-2);
  }

  .immersive-progress-bar {
    width: 40px;
  }

  .immersive-back-btn,
  .immersive-menu-btn,
  .immersive-sidebar-btn {
    width: 36px;
    height: 36px;
  }
}