:root {
  --color-primary: #2563eb;
  --color-primary-dark: #1d4ed8;
  --color-primary-light: #3b82f6;
  --color-secondary: #0f172a;
  --color-text: #1e293b;
  --color-text-light: #64748b;
  --color-text-muted: #94a3b8;
  --color-background: #ffffff;
  --color-background-alt: #f8fafc;
  --color-border: #e2e8f0;
  --color-success: #22c55e;
  --color-error: #ef4444;
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --transition: 0.2s ease;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-background);
}

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
  z-index: 1000;
}

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 72px;
}

.logo {
  font-size: 20px;
  font-weight: 700;
  color: var(--color-primary);
  text-decoration: none;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--color-text);
  transition: var(--transition);
}

.nav-list {
  display: flex;
  gap: 32px;
  list-style: none;
}

.nav-list a {
  font-size: 15px;
  font-weight: 500;
  color: var(--color-text);
  text-decoration: none;
  transition: color var(--transition);
}

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

.hero {
  padding: 140px 0 80px;
  background: linear-gradient(135deg, #eff6ff 0%, #f8fafc 100%);
  text-align: center;
}

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

.hero h1 {
  font-size: 48px;
  font-weight: 700;
  line-height: 1.2;
  color: var(--color-secondary);
  margin-bottom: 24px;
}

.hero-subtitle {
  font-size: 18px;
  line-height: 1.7;
  color: var(--color-text-light);
  margin-bottom: 32px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 28px;
  font-size: 16px;
  font-weight: 600;
  text-decoration: none;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: all var(--transition);
}

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

.btn-primary:hover {
  background-color: var(--color-primary-dark);
  transform: translateY(-1px);
}

.btn-full {
  width: 100%;
}

.section {
  padding: 80px 0;
}

.section-alt {
  background-color: var(--color-background-alt);
}

.section-title {
  font-size: 36px;
  font-weight: 700;
  color: var(--color-secondary);
  text-align: center;
  margin-bottom: 48px;
}

.about-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.about-card {
  background: var(--color-background);
  padding: 32px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  transition: box-shadow var(--transition);
}

.about-card:hover {
  box-shadow: var(--shadow-lg);
}

.about-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #eff6ff 0%, #dbeafe 100%);
  border-radius: var(--radius-md);
  margin-bottom: 20px;
}

.about-icon svg {
  width: 24px;
  height: 24px;
  color: var(--color-primary);
}

.about-card h3 {
  font-size: 20px;
  font-weight: 600;
  color: var(--color-secondary);
  margin-bottom: 12px;
}

.about-card p {
  font-size: 15px;
  color: var(--color-text-light);
  line-height: 1.7;
}

.learn-grid {
  max-width: 700px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.learn-item {
  display: flex;
  align-items: flex-start;
  gap: 20px;
  background: var(--color-background);
  padding: 24px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
}

.learn-number {
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-primary);
  color: white;
  font-size: 18px;
  font-weight: 700;
  border-radius: 50%;
}

.learn-content h3 {
  font-size: 18px;
  font-weight: 600;
  color: var(--color-secondary);
  margin-bottom: 8px;
}

.learn-content p {
  font-size: 15px;
  color: var(--color-text-light);
  line-height: 1.6;
}

.benefits-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.benefit-card {
  text-align: center;
  padding: 32px 24px;
  background: var(--color-background-alt);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  transition: transform var(--transition), box-shadow var(--transition);
}

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

.benefit-icon {
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  border-radius: 50%;
  margin: 0 auto 20px;
}

.benefit-icon svg {
  width: 28px;
  height: 28px;
  color: white;
}

.benefit-card h3 {
  font-size: 18px;
  font-weight: 600;
  color: var(--color-secondary);
  margin-bottom: 12px;
}

.benefit-card p {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.6;
}

.faq-list {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

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

.faq-question {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  padding: 20px 24px;
  background: none;
  border: none;
  font-size: 16px;
  font-weight: 600;
  color: var(--color-secondary);
  text-align: left;
  cursor: pointer;
  transition: background-color var(--transition);
}

.faq-question:hover {
  background-color: var(--color-background-alt);
}

.faq-icon {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  color: var(--color-text-muted);
  transition: transform var(--transition);
}

.faq-item.active .faq-icon {
  transform: rotate(180deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
}

.faq-answer p {
  padding: 0 24px 20px;
  font-size: 15px;
  color: var(--color-text-light);
  line-height: 1.7;
}

.faq-item.active .faq-answer {
  max-height: 300px;
}

.form-wrapper {
  max-width: 560px;
  margin: 0 auto;
  background: var(--color-background-alt);
  padding: 48px;
  border-radius: var(--radius-xl);
  border: 1px solid var(--color-border);
}

.form-subtitle {
  text-align: center;
  font-size: 16px;
  color: var(--color-text-light);
  margin-bottom: 32px;
  margin-top: -32px;
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.form-group label {
  font-size: 14px;
  font-weight: 500;
  color: var(--color-text);
}

.required {
  color: var(--color-error);
}

.optional {
  color: var(--color-text-muted);
  font-weight: 400;
}

.form-group input,
.form-group select {
  padding: 12px 16px;
  font-size: 16px;
  font-family: inherit;
  color: var(--color-text);
  background: var(--color-background);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: border-color var(--transition), box-shadow var(--transition);
}

.form-group input:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-group input.error,
.form-group select.error {
  border-color: var(--color-error);
}

.helper-text {
  font-size: 13px;
  color: var(--color-text-muted);
}

.error-message {
  font-size: 13px;
  color: var(--color-error);
  display: none;
}

.form-group.has-error .error-message {
  display: block;
}

.form-group-checkbox {
  margin-top: 8px;
}

.checkbox-label {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  cursor: pointer;
}

.checkbox-label input[type="checkbox"] {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
}

.checkmark {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  background: var(--color-background);
  border: 2px solid var(--color-border);
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition);
  margin-top: 2px;
}

.checkbox-label input[type="checkbox"]:checked + .checkmark {
  background: var(--color-primary);
  border-color: var(--color-primary);
}

.checkbox-label input[type="checkbox"]:checked + .checkmark::after {
  content: '';
  width: 6px;
  height: 10px;
  border: solid white;
  border-width: 0 2px 2px 0;
  transform: rotate(45deg);
  margin-bottom: 2px;
}

.checkbox-text {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.5;
}

.footer {
  background: var(--color-secondary);
  color: white;
  padding: 48px 0 24px;
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 32px;
  padding-bottom: 32px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-logo {
  font-size: 18px;
  font-weight: 700;
  color: white;
}

.footer-disclaimer {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.6);
  margin-top: 12px;
  max-width: 400px;
  line-height: 1.6;
}

.footer-links {
  display: flex;
  gap: 24px;
}

.footer-links a {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.8);
  text-decoration: none;
  transition: color var(--transition);
}

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

.footer-bottom {
  padding-top: 24px;
  text-align: center;
}

.footer-bottom p {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.5);
}

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

@media (max-width: 768px) {
  .nav-toggle {
    display: flex;
  }
  
  .nav-list {
    position: fixed;
    top: 72px;
    left: 0;
    right: 0;
    flex-direction: column;
    gap: 0;
    background: white;
    border-bottom: 1px solid var(--color-border);
    padding: 16px 0;
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
  }
  
  .nav-list.active {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }
  
  .nav-list li {
    width: 100%;
  }
  
  .nav-list a {
    display: block;
    padding: 12px 24px;
  }
  
  .hero h1 {
    font-size: 32px;
  }
  
  .hero-subtitle {
    font-size: 16px;
  }
  
  .section {
    padding: 60px 0;
  }
  
  .section-title {
    font-size: 28px;
    margin-bottom: 32px;
  }
  
  .about-grid {
    grid-template-columns: 1fr;
  }
  
  .benefits-grid {
    grid-template-columns: 1fr;
  }
  
  .form-wrapper {
    padding: 32px 24px;
  }
  
  .footer-content {
    flex-direction: column;
    text-align: center;
    align-items: center;
  }
  
  .footer-links {
    flex-direction: column;
    gap: 12px;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 16px;
  }
  
  .hero {
    padding: 120px 0 60px;
  }
  
  .hero h1 {
    font-size: 28px;
  }
  
  .btn {
    padding: 12px 24px;
    font-size: 15px;
  }
  
  .learn-item {
    flex-direction: column;
    gap: 16px;
  }
  
  .form-wrapper {
    padding: 24px 16px;
  }
}