:root {
  /* Цвета */
  --color-primary: #3E5560;
  --color-accent: #FF6B35;
  --color-secondary: #1BA6A6;
  --color-background: #F5F7FA;
  --color-surface: #FFFFFF;
  --color-dark: #1F2A30;
  --color-success: #2EAD6B;
  --color-warning: #F2B705;
  --color-danger: #E24A4A;
  --color-info: #3E8EDE;

  /* Тени */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);

  /* Скругления */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;

  /* Отступы */
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;

  /* Типографика */
  --font-family: 'Inter', 'Roboto', -apple-system, sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  font-family: var(--font-family);
  background: var(--color-background);
  color: var(--color-dark);
  line-height: 1.6;
  margin: 0;
  font-size: 16px;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

/* Navbar */
.navbar {
  background: var(--color-primary);
  padding: 0 var(--spacing-lg);
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  box-shadow: var(--shadow-md);
}

.navbar__brand img {
  height: 40px;
}

.navbar__menu {
  display: flex;
  gap: var(--spacing-sm);
}

.navbar__link {
  color: rgba(255, 255, 255, 0.8);
  text-decoration: none;
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-sm);
  transition: all 0.2s;
  font-weight: 500;
}

.navbar__link:hover,
.navbar__link.active {
  color: white;
  background: var(--color-accent);
}

/* Hero Section */
.hero {
  background: linear-gradient(135deg, var(--color-primary) 0%, #2a3f4b 100%);
  color: white;
  padding: var(--spacing-xl) 0;
  text-align: center;
}

.hero__content h1 {
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 700;
  margin-bottom: var(--spacing-md);
  line-height: 1.2;
}

.hero__content p {
  font-size: 1.25rem;
  margin-bottom: var(--spacing-xl);
  opacity: 0.95;
}

.btn {
  display: inline-block;
  padding: 14px 32px;
  border-radius: var(--radius-md);
  text-decoration: none;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: all 0.2s;
  font-size: 16px;
}

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

.btn-primary:hover {
  background: #e55a2b;
  transform: translateY(-1px);
  box-shadow: var(--shadow-lg);
}

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

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

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

/* Cards */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: var(--spacing-lg);
  margin: var(--spacing-xl) 0;
}

.course-card {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  transition: all 0.3s;
  position: relative;
}

.course-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
}

.course-card__badge {
  position: absolute;
  top: 16px;
  left: 16px;
  background: var(--color-accent);
  color: white;
  padding: 4px 12px;
  font-size: 12px;
  font-weight: 600;
  border-radius: var(--radius-sm);
  z-index: 2;
}

.course-card__image {
  width: 100%;
  height: 200px;
  object-fit: cover;
}

.course-card__content {
  padding: var(--spacing-lg);
}

.course-card__title {
  color: var(--color-dark);
  font-size: 20px;
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
}

.course-card__description {
  color: #6B7280;
  margin-bottom: var(--spacing-md);
  font-size: 14px;
}

.course-card__meta {
  display: flex;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
  font-size: 14px;
}

.course-card__footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: var(--spacing-md);
  border-top: 1px solid #E5E7EB;
}

.course-price {
  font-size: 24px;
  font-weight: 700;
  color: var(--color-accent);
}

/* Form */
.form-section {
  background: var(--color-surface);
  padding: var(--spacing-xl);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  margin: var(--spacing-xl) 0;
}

.form-group {
  margin-bottom: var(--spacing-lg);
}

.form-label {
  display: block;
  font-weight: 600;
  color: var(--color-dark);
  margin-bottom: var(--spacing-sm);
  font-size: 14px;
}

.form-control {
  width: 100%;
  padding: 12px 16px;
  border: 2px solid #E5E7EB;
  border-radius: var(--radius-md);
  font-size: 16px;
  transition: border-color 0.2s, box-shadow 0.2s;
  background: white;
}

.form-control:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(255, 107, 53, 0.1);
}

/* Responsive */
@media (max-width: 768px) {
  .container {
    padding: 0 var(--spacing-sm);
  }

  .navbar {
    padding: 0 var(--spacing-md);
    flex-direction: column;
    height: auto;
    padding-top: var(--spacing-md);
  }

  .navbar__menu {
    order: 3;
    width: 100%;
    justify-content: center;
    margin-top: var(--spacing-sm);
  }

  .hero {
    padding: var(--spacing-lg) 0;
  }
}

/* Utility classes */
.text-center { text-align: center; }
.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }