@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@400;500;600;700&family=Inter:wght@300;400;500;600&display=swap');

/* CSS Variables */
:root {
  /* Colors */
  --color-primary: #111318;
  --color-secondary: #1C1F26;
  --color-tertiary: #2A2F38;
  --color-accent: #0F1A2B;
  --color-dark: #1A1D22;
  --color-light: #E8E9ED;
  --color-highlight: #4A90E2;
  --color-success: #52C41A;
  --color-border: #2A2F38;
  
  /* Typography */
  --font-primary: 'Space Grotesk', sans-serif;
  --font-secondary: 'Inter', sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-md: 1.125rem;
  --font-size-lg: 1.5rem;
  --font-size-xl: 2rem;
  --font-size-xxl: 2.5rem;
  
  /* Spacing */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2rem;
  --space-xl: 3rem;
  --space-xxl: 4rem;
  
  /* Border Radius */
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 1rem;
  --radius-full: 9999px;
  
  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 20px rgba(74, 144, 226, 0.3);
  
  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-base: 0.3s ease;
  --transition-slow: 0.5s ease;
}

/* Reset & Base Styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

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

body {
  font-family: var(--font-secondary);
  font-size: var(--font-size-base);
  line-height: 1.6;
  color: var(--color-light);
  background-color: var(--color-primary);
  overflow-x: hidden;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

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

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

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-primary);
  font-weight: 600;
  line-height: 1.2;
  margin-bottom: var(--space-md);
}

h1 { font-size: var(--font-size-xxl); }
h2 { font-size: var(--font-size-xl); }
h3 { font-size: var(--font-size-lg); }
h4 { font-size: var(--font-size-md); }

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

/* Container */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-md);
}

/* Header - Unique Collapsible Design */
.site-header {
  position: relative;
  background: linear-gradient(135deg, var(--color-secondary) 0%, var(--color-accent) 100%);
  padding: var(--space-sm) 0;
  border-bottom: 2px solid var(--color-tertiary);
  z-index: 1000;
  transition: transform var(--transition-base);
}

.site-header.hidden {
  transform: translateY(-100%);
}

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.site-logo {
  font-family: var(--font-primary);
  font-size: var(--font-size-lg);
  font-weight: 700;
  color: var(--color-light);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  transition: all var(--transition-base);
}

.site-logo:hover {
  color: var(--color-highlight);
  text-shadow: var(--shadow-glow);
}

/* Navigation */
.main-nav {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.nav-list {
  display: flex;
  list-style: none;
  gap: var(--space-md);
}

.nav-link {
  font-family: var(--font-primary);
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-light);
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.nav-link:hover {
  background-color: var(--color-tertiary);
  color: var(--color-highlight);
}

/* Burger Menu */
.burger-toggle {
  display: none;
  flex-direction: column;
  gap: 0.25rem;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: var(--space-xs);
}

.burger-line {
  width: 1.5rem;
  height: 2px;
  background-color: var(--color-light);
  transition: all var(--transition-fast);
  border-radius: var(--radius-sm);
}

.burger-toggle.active .burger-line:nth-child(1) {
  transform: rotate(45deg) translate(0.4rem, 0.4rem);
}

.burger-toggle.active .burger-line:nth-child(2) {
  opacity: 0;
}

.burger-toggle.active .burger-line:nth-child(3) {
  transform: rotate(-45deg) translate(0.4rem, -0.4rem);
}

/* Hero Section */
.hero-section {
  position: relative;
  padding: var(--space-xxl) 0;
  background: linear-gradient(180deg, var(--color-accent) 0%, var(--color-primary) 100%);
  overflow: hidden;
}

.hero-section::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: repeating-linear-gradient(
    45deg,
    transparent,
    transparent 10px,
    rgba(74, 144, 226, 0.03) 10px,
    rgba(74, 144, 226, 0.03) 20px
  );
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 800px;
  margin: 0 auto;
}

.hero-title {
  font-size: clamp(2rem, 5vw, 3.5rem);
  margin-bottom: var(--space-md);
  background: linear-gradient(135deg, var(--color-light) 0%, var(--color-highlight) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: var(--font-size-md);
  color: var(--color-light);
  opacity: 0.9;
  margin-bottom: var(--space-lg);
}

/* Section Styles */
.content-section {
  padding: var(--space-xl) 0;
}

.section-header {
  text-align: center;
  margin-bottom: var(--space-lg);
}

.section-title {
  font-size: var(--font-size-xl);
  margin-bottom: var(--space-sm);
  position: relative;
  display: inline-block;
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: -0.5rem;
  left: 50%;
  transform: translateX(-50%);
  width: 4rem;
  height: 3px;
  background: linear-gradient(90deg, transparent, var(--color-highlight), transparent);
  border-radius: var(--radius-full);
}

.section-description {
  font-size: var(--font-size-md);
  color: var(--color-light);
  opacity: 0.85;
  max-width: 700px;
  margin: 0 auto;
}

/* Card Grid */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-md);
  margin-top: var(--space-lg);
}

.feature-card {
  background: linear-gradient(135deg, var(--color-secondary) 0%, var(--color-tertiary) 100%);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  transition: all var(--transition-base);
  box-shadow: var(--shadow-sm);
}

.feature-card:hover {
  transform: translateY(-0.5rem);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-highlight);
}

.card-icon {
  font-size: 2.5rem;
  margin-bottom: var(--space-sm);
  color: var(--color-highlight);
}

.card-title {
  font-size: var(--font-size-lg);
  margin-bottom: var(--space-sm);
  color: var(--color-light);
}

.card-description {
  font-size: var(--font-size-sm);
  color: var(--color-light);
  opacity: 0.8;
  line-height: 1.6;
}

/* Product Cards */
.product-card {
  background: var(--color-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--transition-base);
}

.product-card:hover {
  transform: translateY(-0.5rem);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-highlight);
}

.product-image {
  width: 100%;
  height: 200px;
  background: linear-gradient(135deg, var(--color-tertiary), var(--color-accent));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3rem;
  color: var(--color-highlight);
}

.product-info {
  padding: var(--space-md);
}

.product-name {
  font-size: var(--font-size-lg);
  margin-bottom: var(--space-xs);
  color: var(--color-light);
}

.product-price {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--color-highlight);
  margin-bottom: var(--space-sm);
}

.product-description {
  font-size: var(--font-size-sm);
  color: var(--color-light);
  opacity: 0.8;
  margin-bottom: var(--space-md);
}

/* Buttons */
.btn {
  display: inline-block;
  padding: var(--space-sm) var(--space-lg);
  font-family: var(--font-primary);
  font-size: var(--font-size-sm);
  font-weight: 600;
  text-align: center;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-base);
  border: none;
  text-decoration: none;
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-highlight) 0%, #357ABD 100%);
  color: white;
  box-shadow: var(--shadow-md);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-glow);
  color: white;
}

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

.btn-secondary:hover {
  background: var(--color-highlight);
  color: white;
}

/* Contact Section */
.contact-wrapper {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-xl);
  margin-top: var(--space-lg);
}

.contact-info {
  background: linear-gradient(135deg, var(--color-secondary) 0%, var(--color-tertiary) 100%);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
}

.info-item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-sm);
  margin-bottom: var(--space-md);
}

.info-icon {
  font-size: 1.5rem;
  color: var(--color-highlight);
  flex-shrink: 0;
}

.info-content h3 {
  font-size: var(--font-size-base);
  margin-bottom: var(--space-xs);
  color: var(--color-light);
}

.info-content p {
  font-size: var(--font-size-sm);
  color: var(--color-light);
  opacity: 0.8;
  margin: 0;
}

/* Contact Form */
.contact-form {
  background: var(--color-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
}

.form-group {
  margin-bottom: var(--space-md);
}

.form-label {
  display: block;
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-light);
  margin-bottom: var(--space-xs);
}

.form-input,
.form-textarea {
  width: 100%;
  padding: var(--space-sm);
  font-family: var(--font-secondary);
  font-size: var(--font-size-sm);
  color: var(--color-light);
  background: var(--color-tertiary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.form-input:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--color-highlight);
  box-shadow: 0 0 0 3px rgba(74, 144, 226, 0.1);
}

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

.form-checkbox-group {
  display: flex;
  align-items: flex-start;
  gap: var(--space-sm);
}

.form-checkbox {
  width: 1.25rem;
  height: 1.25rem;
  cursor: pointer;
  flex-shrink: 0;
}

.checkbox-label {
  font-size: var(--font-size-xs);
  color: var(--color-light);
  opacity: 0.8;
  line-height: 1.4;
}

/* Map Container */
.map-container {
  width: 100%;
  height: 400px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-md);
  margin-top: var(--space-lg);
}

.map-container iframe {
  width: 100%;
  height: 100%;
  border: none;
}

/* Footer */
.site-footer {
  background: var(--color-secondary);
  border-top: 2px solid var(--color-tertiary);
  padding: var(--space-lg) 0 var(--space-md);
  margin-top: var(--space-xxl);
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-md);
}

.footer-links {
  display: flex;
  list-style: none;
  gap: var(--space-md);
  flex-wrap: wrap;
}

.footer-link {
  font-size: var(--font-size-xs);
  color: var(--color-light);
  opacity: 0.7;
  transition: opacity var(--transition-fast);
}

.footer-link:hover {
  opacity: 1;
  color: var(--color-highlight);
}

.copyright {
  font-size: var(--font-size-xs);
  color: var(--color-light);
  opacity: 0.6;
}

/* Privacy Popup */
.privacy-popup {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--color-secondary);
  border-top: 2px solid var(--color-highlight);
  padding: var(--space-md);
  box-shadow: var(--shadow-lg);
  z-index: 9999;
  transform: translateY(100%);
  transition: transform var(--transition-base);
}

.privacy-popup.show {
  transform: translateY(0);
}

.popup-content {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-md);
  flex-wrap: wrap;
}

.popup-text {
  font-size: var(--font-size-sm);
  color: var(--color-light);
  flex: 1;
}

.popup-actions {
  display: flex;
  gap: var(--space-sm);
}

.btn-accept {
  background: var(--color-highlight);
  color: white;
  padding: var(--space-xs) var(--space-md);
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  font-weight: 500;
  border: none;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-accept:hover {
  background: #357ABD;
}

/* 404 Page */
.error-page {
  min-height: 80vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
}

.error-content {
  max-width: 600px;
}

.error-code {
  font-size: clamp(4rem, 10vw, 8rem);
  font-weight: 700;
  background: linear-gradient(135deg, var(--color-highlight) 0%, var(--color-light) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
  margin-bottom: var(--space-sm);
}

.error-message {
  font-size: var(--font-size-xl);
  color: var(--color-light);
  margin-bottom: var(--space-md);
}

.error-description {
  font-size: var(--font-size-base);
  color: var(--color-light);
  opacity: 0.7;
  margin-bottom: var(--space-lg);
}

/* Thank You Page */
.thankyou-page {
  min-height: 80vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

.thankyou-content {
  text-align: center;
  max-width: 600px;
}

.thankyou-icon {
  font-size: 5rem;
  color: var(--color-success);
  margin-bottom: var(--space-md);
}

/* Responsive Design */
@media (max-width: 768px) {
  .nav-list {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--color-secondary);
    flex-direction: column;
    padding: var(--space-md);
    box-shadow: var(--shadow-lg);
    border-top: 1px solid var(--color-border);
  }
  
  .nav-list.active {
    display: flex;
  }
  
  .burger-toggle {
    display: flex;
  }
  
  .card-grid {
    grid-template-columns: 1fr;
  }
  
  .contact-wrapper {
    grid-template-columns: 1fr;
  }
  
  .footer-content {
    flex-direction: column;
    text-align: center;
  }
  
  .footer-links {
    justify-content: center;
  }
  
  .popup-content {
    flex-direction: column;
    text-align: center;
  }
}

@media (max-width: 480px) {
  :root {
    --font-size-xs: 0.7rem;
    --font-size-sm: 0.8rem;
    --font-size-base: 0.9rem;
    --space-xs: 0.4rem;
    --space-sm: 0.8rem;
    --space-md: 1.2rem;
    --space-lg: 1.6rem;
    --space-xl: 2.4rem;
    --space-xxl: 3.2rem;
  }
  
  .site-logo {
    font-size: var(--font-size-md);
  }
  
  .hero-section {
    padding: var(--space-xl) 0;
  }
  
  .card-grid {
    gap: var(--space-sm);
  }
  
  .feature-card,
  .product-card {
    padding: var(--space-md);
  }
}

/* =========================
   3D Course Website - 320px Optimized
   ========================= */

/* Base Adjustments for Ultra-Small Screens */
@media (max-width: 320px) {
  :root {
    --font-size-xs: 0.65rem;
    --font-size-sm: 0.75rem;
    --font-size-base: 0.85rem;
    --font-size-md: 1rem;
    --font-size-lg: 1.25rem;
    --font-size-xl: 1.5rem;
    --font-size-xxl: 1.8rem;

    --space-xs: 0.3rem;
    --space-sm: 0.6rem;
    --space-md: 1rem;
    --space-lg: 1.4rem;
    --space-xl: 2rem;
    --space-xxl: 2.5rem;
  }

  /* Containers */
  .container {
    padding: 0 var(--space-xs);
  }

  /* Header */
  .site-header {
    padding: var(--space-xs) 0;
  }


  /* Navigation */
  .nav-list {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--color-secondary);
    flex-direction: column;
    padding: var(--space-xs);
    gap: var(--space-xs);
    border-top: 1px solid var(--color-border);
    z-index: 999;
  }

  .nav-list.active {
    display: flex;
  }

  .nav-link {
    font-size: var(--font-size-xs);
    padding: var(--space-xs);
  }

  .burger-toggle {
    display: flex;
  }

  /* Hero Section */
  .hero-section {
    padding: var(--space-xl) 0;
  }

  .hero-title {
    font-size: clamp(1.5rem, 6vw, 2.5rem);
  }

  .hero-subtitle {
    font-size: var(--font-size-sm);
    margin-bottom: var(--space-md);
  }

  /* Card Grid */
  .card-grid {
    grid-template-columns: 1fr;
    gap: var(--space-xs);
  }

  .feature-card,
  .product-card {
    padding: var(--space-md);
  }

  .card-title {
    font-size: var(--font-size-md);
  }

  .card-description,
  .product-description {
    font-size: var(--font-size-xs);
  }

  /* Buttons */
  .btn {
    font-size: var(--font-size-xs);
    padding: var(--space-xs) var(--space-sm);
  }

  /* Contact Section */
  .contact-wrapper {
    grid-template-columns: 1fr;
    gap: var(--space-md);
  }

  .contact-info,
  .contact-form {
    padding: var(--space-md);
  }

  /* Footer */
  .footer-content {
    flex-direction: column;
    text-align: center;
  }

  .footer-links {
    justify-content: center;
    gap: var(--space-xs);
  }

  /* Popup */
  .popup-content {
    flex-direction: column;
    text-align: center;
  }

  .popup-actions {
    justify-content: center;
    gap: var(--space-xs);
  }

  /* 404 & Thank You Pages */
  .error-code {
    font-size: clamp(3rem, 12vw, 6rem);
  }

  .error-message,
  .thankyou-content {
    font-size: var(--font-size-md);
  }

  .thankyou-icon {
    font-size: 4rem;
  }

  /* Map */
  .map-container {
    height: 250px;
  }
}