/* ============================================
   AI COURSE CREATOR - MAIN STYLESHEET
   Version: 2.0
   ============================================ */

/* ============================================
   IMPORT FONTS
   ============================================ */
@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@300;400;500;600;700;800&display=swap');

/* ============================================
   CSS VARIABLES / DESIGN TOKENS
   ============================================ */
:root {
  /* --- Color Palette --- */
  --color-primary: #1a56db;
  --color-primary-hover: #1e40af;
  --color-primary-light: rgba(26, 86, 219, 0.1);
  --color-secondary: #4f46e5;
  --color-secondary-hover: #4338ca;
  --color-accent: #059669;
  --color-accent-hover: #047857;
  --color-accent-light: rgba(5, 150, 105, 0.1);
  
  --color-bg: #f8fafc;
  --color-bg-alt: #f1f5f9;
  --color-card: #ffffff;
  --color-card-border: #e2e8f0;
  
  --color-text-primary: #0f172a;
  --color-text-secondary: #475569;
  --color-text-tertiary: #94a3b8;
  --color-text-inverse: #ffffff;
  
  --color-border: #e2e8f0;
  --color-border-light: #f1f5f9;
  --color-shadow: rgba(15, 23, 42, 0.08);
  --color-shadow-lg: rgba(15, 23, 42, 0.12);
  
  --color-success: #059669;
  --color-warning: #d97706;
  --color-error: #dc2626;
  --color-info: #2563eb;

  /* --- Typography --- */
  --font-family: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  
  --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: 0.5rem;
  --radius-md: 0.75rem;
  --radius-lg: 1rem;
  --radius-xl: 1.25rem;
  --radius-2xl: 1.5rem;
  --radius-full: 9999px;

  /* --- Transitions --- */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);

  /* --- Shadows --- */
  --shadow-sm: 0 1px 2px 0 var(--color-shadow);
  --shadow-md: 0 4px 6px -1px var(--color-shadow), 0 2px 4px -1px var(--color-shadow);
  --shadow-lg: 0 10px 15px -3px var(--color-shadow), 0 4px 6px -2px var(--color-shadow);
  --shadow-xl: 0 20px 25px -5px var(--color-shadow), 0 10px 10px -5px var(--color-shadow);
  --shadow-2xl: 0 25px 50px -12px var(--color-shadow-lg);
}

/* ============================================
   RESET & BASE
   ============================================ */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-family);
  background-color: var(--color-bg);
  color: var(--color-text-primary);
  line-height: 1.6;
}

/* ============================================
   TYPOGRAPHY
   ============================================ */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.2;
  color: var(--color-text-primary);
}

h1 {
  font-size: var(--text-5xl);
  font-weight: 800;
  letter-spacing: -0.025em;
}

h2 {
  font-size: var(--text-4xl);
  font-weight: 700;
  letter-spacing: -0.025em;
}

h3 {
  font-size: var(--text-2xl);
  font-weight: 600;
}

h4 {
  font-size: var(--text-xl);
  font-weight: 600;
}

p {
  color: var(--color-text-secondary);
  line-height: 1.7;
}

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

a:hover {
  color: var(--color-primary-hover);
}

/* ============================================
   CONTAINER
   ============================================ */
.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 var(--space-6);
}

@media (min-width: 640px) {
  .container {
    padding: 0 var(--space-8);
  }
}

@media (min-width: 1024px) {
  .container {
    padding: 0 var(--space-12);
  }
}

/* ============================================
   BUTTONS
   ============================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  font-size: var(--text-sm);
  font-weight: 600;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-base);
  text-decoration: none;
  min-height: 3rem;
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
  color: var(--color-text-inverse);
  box-shadow: 0 4px 14px 0 rgba(26, 86, 219, 0.35);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px 0 rgba(26, 86, 219, 0.45);
  background: linear-gradient(135deg, var(--color-primary-hover) 0%, var(--color-secondary-hover) 100%);
  color: var(--color-text-inverse);
}

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

.btn-secondary:hover {
  background: var(--color-bg-alt);
  border-color: var(--color-text-tertiary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn-success {
  background: var(--color-accent);
  color: var(--color-text-inverse);
}

.btn-success:hover {
  background: var(--color-accent-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn-outline {
  background: transparent;
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
}

.btn-outline:hover {
  background: var(--color-primary);
  color: var(--color-text-inverse);
  transform: translateY(-2px);
}

.btn-sm {
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-xs);
  min-height: 2.25rem;
}

.btn-lg {
  padding: var(--space-4) var(--space-8);
  font-size: var(--text-lg);
  min-height: 3.5rem;
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none !important;
}

/* ============================================
   CARDS
   ============================================ */
.card {
  background: var(--color-card);
  border: 1px solid var(--color-card-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  transition: all var(--transition-base);
}

.card-hover {
  transition: all var(--transition-base);
}

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

/* ============================================
   BADGES
   ============================================ */
.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-1) var(--space-3);
  font-size: var(--text-xs);
  font-weight: 600;
  border-radius: var(--radius-full);
  text-transform: uppercase;
  letter-spacing: 0.025em;
}

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

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

.badge-warning {
  background: rgba(217, 119, 6, 0.1);
  color: var(--color-warning);
}

.badge-enterprise {
  background: linear-gradient(135deg, var(--color-secondary) 0%, var(--color-primary) 100%);
  color: var(--color-text-inverse);
}

/* ============================================
   HERO SECTION
   ============================================ */
.hero {
  position: relative;
  padding: var(--space-24) 0 var(--space-16);
  overflow: hidden;
  background: linear-gradient(180deg, var(--color-bg) 0%, var(--color-card) 100%);
}

.hero-glow {
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 100%;
  max-width: 1200px;
  height: 600px;
  background: radial-gradient(ellipse at 50% 0%, rgba(26, 86, 219, 0.08) 0%, rgba(79, 70, 229, 0.04) 50%, transparent 100%);
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 900px;
  margin: 0 auto;
}

.hero h1 {
  margin-bottom: var(--space-4);
}

.hero h1 .gradient-text {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero .subtitle {
  font-size: var(--text-xl);
  color: var(--color-text-secondary);
  max-width: 640px;
  margin: 0 auto var(--space-8);
}

.hero .cta-group {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-4);
  margin-bottom: var(--space-12);
}

/* Hero Stats */
.hero-stats {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-8);
  padding-top: var(--space-8);
  border-top: 1px solid var(--color-border);
}

.hero-stat {
  text-align: center;
}

.hero-stat .number {
  font-size: var(--text-3xl);
  font-weight: 800;
  color: var(--color-text-primary);
  display: block;
}

.hero-stat .label {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
}

/* Hero Video Background */
.hero-video-bg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
  opacity: 0.06;
  z-index: 0;
  pointer-events: none;
}

.hero-video-bg video {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ============================================
   HOW IT WORKS
   ============================================ */
.how-it-works {
  padding: var(--space-20) 0;
  background: var(--color-card);
}

.how-it-works .section-header {
  text-align: center;
  max-width: 640px;
  margin: 0 auto var(--space-12);
}

.steps-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-8);
  margin-bottom: var(--space-12);
}

.step-card {
  text-align: center;
  padding: var(--space-6);
}

.step-card .step-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 3.5rem;
  height: 3.5rem;
  border-radius: var(--radius-full);
  background: var(--color-primary-light);
  color: var(--color-primary);
  font-size: var(--text-xl);
  font-weight: 700;
  margin-bottom: var(--space-4);
}

.step-card h4 {
  margin-bottom: var(--space-2);
}

.step-card p {
  font-size: var(--text-sm);
}

/* Video Thumbnail */
.video-thumbnail {
  position: relative;
  max-width: 800px;
  margin: 0 auto;
  border-radius: var(--radius-lg);
  overflow: hidden;
  cursor: pointer;
  box-shadow: var(--shadow-lg);
  transition: all var(--transition-base);
}

.video-thumbnail:hover {
  transform: scale(1.01);
  box-shadow: var(--shadow-xl);
}

.video-thumbnail img {
  width: 100%;
  display: block;
}

.video-thumbnail .play-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(15, 23, 42, 0.3);
  transition: background var(--transition-base);
}

.video-thumbnail:hover .play-overlay {
  background: rgba(15, 23, 42, 0.15);
}

.video-thumbnail .play-button {
  width: 4.5rem;
  height: 4.5rem;
  border-radius: var(--radius-full);
  background: var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: var(--text-2xl);
  transition: all var(--transition-base);
  box-shadow: 0 4px 20px rgba(26, 86, 219, 0.4);
}

.video-thumbnail:hover .play-button {
  transform: scale(1.1);
  background: var(--color-primary-hover);
}

/* ============================================
   FEATURES
   ============================================ */
.features {
  padding: var(--space-20) 0;
  background: var(--color-bg);
}

.features .section-header {
  text-align: center;
  max-width: 640px;
  margin: 0 auto var(--space-12);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-6);
}

.feature-card {
  background: var(--color-card);
  padding: var(--space-6);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  transition: all var(--transition-base);
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-primary-light);
}

.feature-card .icon {
  width: 3.5rem;
  height: 3.5rem;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--text-xl);
  margin-bottom: var(--space-4);
}

.feature-card .icon.blue {
  background: var(--color-primary-light);
  color: var(--color-primary);
}

.feature-card .icon.indigo {
  background: rgba(79, 70, 229, 0.1);
  color: var(--color-secondary);
}

.feature-card .icon.emerald {
  background: var(--color-accent-light);
  color: var(--color-accent);
}

.feature-card h4 {
  margin-bottom: var(--space-2);
}

.feature-card p {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
}

/* ============================================
   PRICING
   ============================================ */
.pricing {
  padding: var(--space-20) 0;
  background: var(--color-card);
}

.pricing .section-header {
  text-align: center;
  max-width: 640px;
  margin: 0 auto var(--space-12);
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-6);
  align-items: stretch;
}

.pricing-card {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-8);
  transition: all var(--transition-base);
  display: flex;
  flex-direction: column;
  position: relative;
}

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

.pricing-card.popular {
  border: 2px solid var(--color-primary);
  box-shadow: var(--shadow-lg);
}

.pricing-card.popular .popular-badge {
  position: absolute;
  top: -0.75rem;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
  color: var(--color-text-inverse);
  padding: var(--space-1) var(--space-4);
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.025em;
}

.pricing-card.enterprise {
  background: linear-gradient(180deg, var(--color-text-primary) 0%, #1e293b 100%);
  border-color: var(--color-text-primary);
  color: var(--color-text-inverse);
}

.pricing-card.enterprise h3,
.pricing-card.enterprise .price,
.pricing-card.enterprise .price span,
.pricing-card.enterprise p {
  color: var(--color-text-inverse);
}

.pricing-card.enterprise .price .currency {
  color: var(--color-text-tertiary);
}

.pricing-card.enterprise .feature-list li {
  color: var(--color-text-tertiary);
}

.pricing-card.enterprise .feature-list li .highlight {
  color: var(--color-text-inverse);
}

.pricing-card .plan-name {
  font-size: var(--text-lg);
  font-weight: 700;
  margin-bottom: var(--space-2);
}

.pricing-card .price {
  font-size: var(--text-4xl);
  font-weight: 800;
  margin-bottom: var(--space-2);
}

.pricing-card .price .currency {
  font-size: var(--text-base);
  font-weight: 600;
  color: var(--color-text-tertiary);
  margin-left: var(--space-1);
}

.pricing-card .price .period {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-tertiary);
}

.pricing-card .plan-description {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-6);
  padding-bottom: var(--space-4);
  border-bottom: 1px solid var(--color-border);
}

.pricing-card.enterprise .plan-description {
  border-bottom-color: rgba(255, 255, 255, 0.1);
}

.pricing-card .feature-list {
  list-style: none;
  padding: 0;
  margin: 0 0 var(--space-6);
  flex: 1;
}

.pricing-card .feature-list li {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  padding: var(--space-2) 0;
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
}

.pricing-card .feature-list li .check {
  color: var(--color-success);
  flex-shrink: 0;
  margin-top: 0.125rem;
}

.pricing-card .feature-list li .pro {
  color: var(--color-secondary);
  flex-shrink: 0;
}

.pricing-card .feature-list li .enterprise-tag {
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--color-secondary);
  background: rgba(79, 70, 229, 0.1);
  padding: 0 var(--space-2);
  border-radius: var(--radius-sm);
  margin-left: var(--space-1);
}

.pricing-card.enterprise .feature-list li .enterprise-tag {
  color: var(--color-accent);
  background: rgba(5, 150, 105, 0.15);
}

.pricing-card .feature-list li .disabled {
  opacity: 0.4;
}

.pricing-card .btn {
  width: 100%;
  margin-top: auto;
}

/* Early Bird Note */
.early-bird-note {
  font-size: var(--text-xs);
  color: var(--color-accent);
  margin-top: var(--space-2);
  font-weight: 600;
}

.early-bird-note .regular-price {
  color: var(--color-text-tertiary);
  font-weight: 400;
}

/* Bonus CTA */
.bonus-cta {
  margin-top: var(--space-12);
  padding: var(--space-8) var(--space-10);
  background: linear-gradient(135deg, rgba(245, 158, 11, 0.08) 0%, rgba(245, 158, 11, 0.15) 100%);
  border: 1px solid rgba(245, 158, 11, 0.2);
  border-radius: var(--radius-lg);
  text-align: center;
}

.bonus-cta h3 {
  color: var(--color-text-primary);
  margin-bottom: var(--space-2);
}

.bonus-cta p {
  max-width: 480px;
  margin: 0 auto var(--space-4);
}

/* ============================================
   FAQ
   ============================================ */
.faq {
  padding: var(--space-20) 0;
  background: var(--color-bg);
}

.faq .section-header {
  text-align: center;
  max-width: 640px;
  margin: 0 auto var(--space-12);
}

.faq-list {
  max-width: 768px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.faq-item {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: all var(--transition-base);
}

.faq-item:hover {
  border-color: var(--color-primary-light);
}

.faq-item summary {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-4) var(--space-6);
  cursor: pointer;
  font-weight: 600;
  color: var(--color-text-primary);
  list-style: none;
  transition: background var(--transition-fast);
}

.faq-item summary:hover {
  background: var(--color-bg-alt);
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-item .chevron {
  transition: transform var(--transition-base);
  color: var(--color-text-tertiary);
  flex-shrink: 0;
}

.faq-item[open] .chevron {
  transform: rotate(180deg);
}

.faq-item .answer {
  padding: 0 var(--space-6) var(--space-6);
  color: var(--color-text-secondary);
  font-size: var(--text-sm);
  line-height: 1.7;
}

.faq-item .answer ul {
  padding-left: var(--space-6);
  margin: var(--space-2) 0;
}

.faq-item .answer li {
  margin-bottom: var(--space-1);
}

/* ============================================
   FOOTER
   ============================================ */
.footer {
  background: var(--color-text-primary);
  color: var(--color-text-inverse);
  padding: var(--space-16) 0 var(--space-8);
  border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-8);
  margin-bottom: var(--space-8);
}

.footer .brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
}

.footer .brand .logo {
  width: 2.5rem;
  height: 2.5rem;
  background: var(--color-primary);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: var(--text-sm);
}

.footer .brand-text {
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--color-text-inverse);
}

.footer .brand-sub {
  font-size: var(--text-xs);
  color: var(--color-text-tertiary);
}

.footer p {
  color: var(--color-text-tertiary);
  font-size: var(--text-sm);
  max-width: 320px;
}

.footer h5 {
  color: var(--color-text-inverse);
  font-size: var(--text-sm);
  font-weight: 600;
  margin-bottom: var(--space-4);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.footer ul {
  list-style: none;
  padding: 0;
}

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

.footer ul li a {
  color: var(--color-text-tertiary);
  font-size: var(--text-sm);
  transition: color var(--transition-fast);
}

.footer ul li a:hover {
  color: var(--color-text-inverse);
}

.footer .bottom {
  padding-top: var(--space-6);
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  text-align: center;
  font-size: var(--text-xs);
  color: var(--color-text-tertiary);
}

@media (max-width: 768px) {
  .footer-grid {
    grid-template-columns: 1fr;
    gap: var(--space-6);
  }
}

/* ============================================
   VIDEO MODAL
   ============================================ */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(15, 23, 42, 0.8);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  z-index: 1000;
  display: none;
  align-items: center;
  justify-content: center;
  padding: var(--space-4);
}

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

.modal-overlay .modal-content {
  background: var(--color-card);
  border-radius: var(--radius-lg);
  max-width: 900px;
  width: 100%;
  overflow: hidden;
  box-shadow: var(--shadow-2xl);
  animation: modalFadeIn 0.3s ease;
}

@keyframes modalFadeIn {
  from {
    opacity: 0;
    transform: scale(0.95) translateY(20px);
  }
  to {
    opacity: 1;
    transform: scale(1) translateY(0);
  }
}

.modal-overlay .modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-4) var(--space-6);
  border-bottom: 1px solid var(--color-border);
}

.modal-overlay .modal-header h3 {
  font-size: var(--text-base);
}

.modal-overlay .modal-close {
  background: none;
  border: none;
  font-size: var(--text-2xl);
  color: var(--color-text-tertiary);
  cursor: pointer;
  padding: var(--space-2);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
  line-height: 1;
}

.modal-overlay .modal-close:hover {
  background: var(--color-bg-alt);
  color: var(--color-text-primary);
}

.modal-overlay .modal-body {
  padding: var(--space-4);
}

.modal-overlay .modal-body video {
  width: 100%;
  border-radius: var(--radius-sm);
  display: block;
  background: #000;
}

/* ============================================
   NAVIGATION
   ============================================ */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--color-border);
  transition: all var(--transition-base);
}

.nav .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: var(--space-3);
  padding-bottom: var(--space-3);
}

.nav .brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.nav .brand .logo {
  width: 2.5rem;
  height: 2.5rem;
  border-radius: var(--radius-md);
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-card);
  box-shadow: var(--shadow-sm);
}

.nav .brand .logo img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  padding: var(--space-1);
}

.nav .brand .name {
  font-size: var(--text-lg);
  font-weight: 800;
  color: var(--color-text-primary);
}

.nav .brand .badge {
  font-size: var(--text-xs);
  font-weight: 700;
  color: var(--color-primary);
  background: var(--color-primary-light);
  padding: 0 var(--space-2);
  border-radius: var(--radius-full);
}

.nav .links {
  display: flex;
  align-items: center;
  gap: var(--space-6);
}

.nav .links a {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-secondary);
  transition: color var(--transition-fast);
}

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

.nav .actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

/* Mobile Nav Toggle */
.nav-toggle {
  display: none;
  background: none;
  border: none;
  font-size: var(--text-2xl);
  color: var(--color-text-primary);
  cursor: pointer;
  padding: var(--space-2);
}

@media (max-width: 1024px) {
  .nav .links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    background: var(--color-card);
    padding: var(--space-4) var(--space-6);
    border-bottom: 1px solid var(--color-border);
    gap: var(--space-4);
  }
  
  .nav .links.open {
    display: flex;
  }
  
  .nav-toggle {
    display: block;
  }
}

/* ============================================
   RESPONSIVE UTILITIES
   ============================================ */
@media (max-width: 640px) {
  h1 {
    font-size: var(--text-3xl);
  }
  h2 {
    font-size: var(--text-2xl);
  }
  h3 {
    font-size: var(--text-xl);
  }
  
  .hero {
    padding: var(--space-16) 0 var(--space-12);
  }
  
  .hero .subtitle {
    font-size: var(--text-base);
  }
  
  .hero-stats {
    gap: var(--space-4);
  }
  
  .hero-stat .number {
    font-size: var(--text-2xl);
  }
  
  .pricing-grid {
    grid-template-columns: 1fr;
    max-width: 400px;
    margin: 0 auto;
  }
  
  .features-grid {
    grid-template-columns: 1fr;
    max-width: 400px;
    margin: 0 auto;
  }
  
  .steps-grid {
    grid-template-columns: 1fr;
    max-width: 320px;
    margin: 0 auto var(--space-8);
  }
  
  .bonus-cta {
    padding: var(--space-4);
  }
}

@media (min-width: 641px) and (max-width: 1024px) {
  .pricing-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .pricing-grid .pricing-card:last-child {
    grid-column: 1 / -1;
    max-width: 400px;
    margin: 0 auto;
  }
}

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

.hidden {
  display: none !important;
}

.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;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

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

@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateX(-20px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes pulse {
  0%, 100% {
    opacity: 1;
  }
  50% {
    opacity: 0.5;
  }
}

.animate-fade-in {
  animation: fadeIn 0.6s ease forwards;
}

.animate-slide-in {
  animation: slideIn 0.4s ease forwards;
}

/* Counter Animation */
.counter {
  display: inline-block;
}

/* ============================================
   SELECT / DROPDOWN STYLES
   ============================================ */
select,
input[type="text"],
input[type="email"],
input[type="password"],
textarea {
  font-family: var(--font-family);
  padding: var(--space-2) var(--space-3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-card);
  color: var(--color-text-primary);
  font-size: var(--text-sm);
  transition: all var(--transition-fast);
  width: 100%;
}

select:focus,
input:focus,
textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-light);
}

select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%2364748b' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right var(--space-3) center;
  padding-right: var(--space-8);
  cursor: pointer;
}

/* ============================================
   CHAT-SPECIFIC STYLES (for chat.html)
   ============================================ */
.chat-container {
  display: flex;
  flex-direction: column;
  height: 100vh;
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--space-4);
}

.chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-4);
  background: var(--color-card);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  margin-bottom: var(--space-4);
}

.chat-message {
  display: flex;
  margin-bottom: var(--space-4);
  animation: fadeIn 0.3s ease;
}

.chat-message.user {
  justify-content: flex-end;
}

.chat-message.ai {
  justify-content: flex-start;
}

.chat-message .bubble {
  max-width: 80%;
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-lg);
  line-height: 1.6;
  word-wrap: break-word;
}

.chat-message.user .bubble {
  background: var(--color-primary);
  color: var(--color-text-inverse);
  border-bottom-right-radius: var(--radius-sm);
}

.chat-message.ai .bubble {
  background: var(--color-bg-alt);
  color: var(--color-text-primary);
  border-bottom-left-radius: var(--radius-sm);
}

.chat-input-area {
  display: flex;
  gap: var(--space-3);
}

.chat-input-area textarea {
  flex: 1;
  resize: vertical;
  min-height: 3rem;
  max-height: 10rem;
}

/* Outline Panel */
.outline-panel {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
  margin-top: var(--space-4);
  max-height: 600px;
  overflow-y: auto;
}

.outline-panel .panel-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-4);
  padding-bottom: var(--space-3);
  border-bottom: 1px solid var(--color-border);
}

.outline-module {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-3);
  overflow: hidden;
}

.outline-module .module-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-3) var(--space-4);
  background: var(--color-bg-alt);
  cursor: default;
}

.outline-module .module-header .title {
  font-weight: 600;
  font-size: var(--text-sm);
}

.outline-module .module-header .actions {
  display: flex;
  gap: var(--space-2);
}

.outline-module .module-header .actions button {
  background: none;
  border: none;
  padding: var(--space-1);
  cursor: pointer;
  color: var(--color-text-tertiary);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
  font-size: var(--text-xs);
}

.outline-module .module-header .actions button:hover {
  background: var(--color-border);
  color: var(--color-text-primary);
}

.outline-module .lesson-list {
  padding: var(--space-2) var(--space-4);
}

.outline-module .lesson-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-2) 0;
  border-bottom: 1px solid var(--color-border-light);
  font-size: var(--text-sm);
}

.outline-module .lesson-item:last-child {
  border-bottom: none;
}

.outline-module .lesson-item .title {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.outline-module .lesson-item .title .status {
  font-size: var(--text-xs);
}

.outline-module .lesson-item .actions {
  display: flex;
  gap: var(--space-1);
}

.outline-module .lesson-item .actions button {
  background: none;
  border: none;
  padding: var(--space-1) var(--space-2);
  cursor: pointer;
  color: var(--color-text-tertiary);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
  font-size: var(--text-xs);
}

.outline-module .lesson-item .actions button:hover {
  background: var(--color-border);
  color: var(--color-text-primary);
}

.outline-module .add-lesson {
  padding: var(--space-2) var(--space-4) var(--space-3);
}

.outline-module .add-lesson input {
  width: 100%;
  padding: var(--space-2) var(--space-3);
  border: 1px dashed var(--color-border);
  border-radius: var(--radius-sm);
  font-size: var(--text-sm);
  background: transparent;
  transition: all var(--transition-fast);
}

.outline-module .add-lesson input:focus {
  border-color: var(--color-primary);
  border-style: solid;
  outline: none;
  background: var(--color-card);
}

/* ============================================
   TOAST NOTIFICATIONS
   ============================================ */
.toast {
  position: fixed;
  bottom: var(--space-6);
  right: var(--space-6);
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-md);
  color: var(--color-text-inverse);
  font-weight: 600;
  font-size: var(--text-sm);
  z-index: 1000;
  animation: slideIn 0.3s ease;
  box-shadow: var(--shadow-lg);
  max-width: 400px;
}

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

.toast-error {
  background: var(--color-error);
}

.toast-info {
  background: var(--color-primary);
}

.toast-warning {
  background: var(--color-warning);
}

@keyframes toastSlideIn {
  from {
    opacity: 0;
    transform: translateX(100px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

/* ============================================
   TYPOGRAPHY - LANDING PAGE SPECIFIC
   ============================================ */
.section-tag {
  display: inline-block;
  font-size: var(--text-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-primary);
  background: var(--color-primary-light);
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  margin-bottom: var(--space-3);
}

/* ============================================
   PRINT STYLES
   ============================================ */
@media print {
  .no-print {
    display: none !important;
  }
  
  body {
    background: white;
    color: black;
  }
  
  .card,
  .pricing-card,
  .feature-card {
    box-shadow: none !important;
    border: 1px solid #ddd !important;
  }
}