/* CSS Variables */
:root {
  --primary: #6366F1;
  --secondary: #8B5CF6;
  --bg-dark: #0F172A;
  --bg-card: #1E293B;
  --text-primary: #F8FAFC;
  --text-secondary: #94A3B8;
  --accent: #22D3EE;
  --gradient: linear-gradient(135deg, var(--primary), var(--secondary));
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  background-color: var(--bg-dark);
  color: var(--text-primary);
  line-height: 1.6;
}

a {
  color: inherit;
  text-decoration: none;
}

ul {
  list-style: none;
}

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

/* Container */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Navigation */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(15, 23, 42, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(99, 102, 241, 0.1);
}

.navbar .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 70px;
}

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav-links {
  display: flex;
  gap: 30px;
}

.nav-links a {
  color: var(--text-secondary);
  transition: color 0.3s;
  font-weight: 500;
}

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

.nav-right {
  display: flex;
  align-items: center;
  gap: 20px;
}

.lang-switch {
  display: flex;
  gap: 10px;
}

.lang-switch button {
  background: transparent;
  border: 1px solid var(--text-secondary);
  color: var(--text-secondary);
  padding: 5px 12px;
  border-radius: 4px;
  cursor: pointer;
  transition: all 0.3s;
  font-size: 0.875rem;
}

.lang-switch button:hover,
.lang-switch button.active {
  background: var(--primary);
  border-color: var(--primary);
  color: var(--text-primary);
}

/* Mobile Menu */
.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 5px;
}

.menu-toggle span {
  width: 25px;
  height: 2px;
  background: var(--text-primary);
  transition: all 0.3s;
}

/* Hero Section */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: 70px;
  background: radial-gradient(ellipse at top, rgba(99, 102, 241, 0.15), transparent 50%);
}

.hero-content {
  text-align: center;
  max-width: 800px;
  margin: 0 auto;
}

.hero h1 {
  font-size: 3.5rem;
  font-weight: 800;
  margin-bottom: 20px;
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero p {
  font-size: 1.25rem;
  color: var(--text-secondary);
  margin-bottom: 40px;
}

.cta-buttons {
  display: flex;
  gap: 20px;
  justify-content: center;
}

.btn {
  padding: 14px 32px;
  border-radius: 8px;
  font-weight: 600;
  font-size: 1rem;
  transition: all 0.3s;
  cursor: pointer;
  border: none;
}

.btn-primary {
  background: var(--gradient);
  color: var(--text-primary);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 30px rgba(99, 102, 241, 0.3);
}

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

.btn-secondary:hover {
  background: var(--primary);
}

/* Sections */
section {
  padding: 100px 0;
}

.section-title {
  text-align: center;
  margin-bottom: 60px;
}

.section-title h2 {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 15px;
}

.section-title p {
  color: var(--text-secondary);
  font-size: 1.1rem;
}

/* Features Grid */
.features-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 30px;
}

/* Cards */
.card {
  background: var(--bg-card);
  border-radius: 16px;
  padding: 30px;
  transition: all 0.3s;
  border: 1px solid rgba(99, 102, 241, 0.1);
}

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

.card-icon {
  width: 60px;
  height: 60px;
  background: var(--gradient);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  font-size: 1.5rem;
}

.card h3 {
  font-size: 1.25rem;
  margin-bottom: 10px;
}

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

/* Scenarios */
.scenarios-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
}

.scenario-card {
  background: var(--bg-card);
  border-radius: 16px;
  overflow: hidden;
  transition: all 0.3s;
  border: 1px solid rgba(99, 102, 241, 0.1);
}

.scenario-card:hover {
  transform: translateY(-5px);
  border-color: var(--primary);
}

.scenario-image {
  height: 200px;
  background: var(--gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 4rem;
}

.scenario-content {
  padding: 25px;
}

.scenario-content h3 {
  font-size: 1.25rem;
  margin-bottom: 10px;
}

.scenario-content p {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

/* Stats */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 30px;
}

.stat-item {
  text-align: center;
  padding: 40px 20px;
  background: var(--bg-card);
  border-radius: 16px;
  border: 1px solid rgba(99, 102, 241, 0.1);
}

.stat-number {
  font-size: 3rem;
  font-weight: 800;
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 10px;
}

.stat-label {
  color: var(--text-secondary);
  font-size: 1rem;
}

/* About Section */
.about-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.about-text h3 {
  font-size: 1.5rem;
  margin-bottom: 20px;
  color: var(--accent);
}

.about-text p {
  color: var(--text-secondary);
  margin-bottom: 15px;
}

.about-image {
  background: var(--gradient);
  border-radius: 16px;
  height: 400px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 6rem;
}

/* Footer */
.footer {
  background: var(--bg-card);
  padding: 60px 0 30px;
  border-top: 1px solid rgba(99, 102, 241, 0.1);
}

.footer-content {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}

.footer-brand .logo {
  margin-bottom: 15px;
  display: inline-block;
}

.footer-brand p {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.footer-links h4 {
  font-size: 1rem;
  margin-bottom: 20px;
  color: var(--text-primary);
}

.footer-links ul li {
  margin-bottom: 10px;
}

.footer-links a {
  color: var(--text-secondary);
  transition: color 0.3s;
  font-size: 0.95rem;
}

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

.footer-bottom {
  text-align: center;
  padding-top: 30px;
  border-top: 1px solid rgba(99, 102, 241, 0.1);
  color: var(--text-secondary);
  font-size: 0.875rem;
}

/* Page Header (for inner pages) */
.page-header {
  padding: 120px 0 60px;
  background: radial-gradient(ellipse at top, rgba(99, 102, 241, 0.15), transparent 50%);
}

.page-header h1 {
  font-size: 2.5rem;
  margin-bottom: 10px;
}

.page-header .update-date {
  color: var(--text-secondary);
}

/* Content Section (for policy pages) */
.content-section {
  padding: 60px 0 100px;
}

.content-section h2 {
  font-size: 1.5rem;
  margin: 40px 0 20px;
  color: var(--accent);
}

.content-section h2:first-child {
  margin-top: 0;
}

.content-section p {
  color: var(--text-secondary);
  margin-bottom: 15px;
}

.content-section ul {
  color: var(--text-secondary);
  margin-bottom: 15px;
  padding-left: 20px;
}

.content-section ul li {
  margin-bottom: 8px;
  list-style: disc;
}

/* Contact Page */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
}

.contact-info h2 {
  font-size: 1.5rem;
  margin-bottom: 30px;
}

.contact-item {
  display: flex;
  gap: 15px;
  margin-bottom: 25px;
}

.contact-icon {
  width: 50px;
  height: 50px;
  background: var(--gradient);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  flex-shrink: 0;
}

.contact-item h3 {
  font-size: 1rem;
  margin-bottom: 5px;
}

.contact-item p {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.contact-form h2 {
  font-size: 1.5rem;
  margin-bottom: 30px;
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  margin-bottom: 8px;
  font-weight: 500;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 14px;
  background: var(--bg-card);
  border: 1px solid rgba(99, 102, 241, 0.2);
  border-radius: 8px;
  color: var(--text-primary);
  font-size: 1rem;
  transition: border-color 0.3s;
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--primary);
}

.form-group textarea {
  min-height: 150px;
  resize: vertical;
}

/* Animations */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s, transform 0.6s;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

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

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

  .footer-content {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: absolute;
    top: 70px;
    left: 0;
    right: 0;
    background: var(--bg-dark);
    flex-direction: column;
    padding: 20px;
    gap: 15px;
    border-bottom: 1px solid rgba(99, 102, 241, 0.1);
  }

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

  .menu-toggle {
    display: flex;
  }

  .hero h1 {
    font-size: 2.5rem;
  }

  .hero p {
    font-size: 1rem;
  }

  .cta-buttons {
    flex-direction: column;
    align-items: center;
  }

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

  .about-content {
    grid-template-columns: 1fr;
  }

  .about-image {
    height: 300px;
  }

  .footer-content {
    grid-template-columns: 1fr;
    text-align: center;
  }

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

  .section-title h2 {
    font-size: 2rem;
  }
}

@media (max-width: 480px) {
  .hero h1 {
    font-size: 2rem;
  }

  .btn {
    width: 100%;
  }

  .stat-number {
    font-size: 2.5rem;
  }
}