:root {
  --color-bg: #FFFFFF;
  --color-text: #1A1A1A;
  --color-text-secondary: #6B7280;
  --color-accent: #001F5D; /* Тёмно-синий цвет логотипа */
  --color-success: #10B981;
  --color-section-bg: #F9FAFB;
  --border-radius: 8px;
  --spacing-sm: 16px;
  --spacing-md: 32px;
  --spacing-lg: 64px;
  --transition: all 0.3s ease;
}

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

body {
  font-family: 'Inter', sans-serif;
  color: var(--color-text);
  background-color: var(--color-bg);
  line-height: 1.6;
  overflow-x: hidden;
}

h1, h2, h3, h4 {
  font-weight: 700;
  line-height: 1.2;
}

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

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

/* HEADER */
header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-md) 0;
  position: sticky;
  top: 0;
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(10px);
  z-index: 100;
  border-bottom: 1px solid rgba(0,0,0,0.05);
}

.logo {
  display: flex;
  align-items: center;
  gap: 16px;
  font-size: 24px;
  font-weight: 700;
  color: var(--color-text);
  text-decoration: none;
}

.logo img {
  width: 150px;
  height: auto;
  margin-top: 4px;
  transition: var(--transition);
}

.logo:hover img {
  transform: scale(1.05);
}

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

nav a {
  text-decoration: none;
  color: var(--color-text);
  font-weight: 500;
  transition: var(--transition);
  padding: 8px 12px;
  border-radius: 6px;
}

nav a:hover {
  color: var(--color-accent);
  background-color: rgba(79, 70, 229, 0.05);
}

/* HERO */
.hero {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: 120px var(--spacing-md) 80px;
  background-color: var(--color-bg);
}

.hero h1 {
  font-size: 48px;
  margin-bottom: 24px;
  max-width: 800px;
}

.hero p {
  font-size: 20px;
  color: var(--color-text-secondary);
  max-width: 600px;
  margin-bottom: 40px;
}

.btn {
  display: inline-block;
  background-color: var(--color-accent);
  color: white;
  padding: 16px 32px;
  border-radius: var(--border-radius);
  font-weight: 600;
  text-decoration: none;
  transition: var(--transition);
  border: none;
  cursor: pointer;
  font-size: 16px;
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(0, 31, 93, 0.3); /* тень под синим */
}

.hero-illustration {
  width: 100%;
  max-width: 600px;
  margin-top: 60px;
}

/* FEATURES */
.features {
  background-color: var(--color-section-bg);
}

.features h2 {
  text-align: center;
  margin-bottom: 40px;
  font-size: 36px;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-lg);
}

.feature-card {
  text-align: center;
  padding: var(--spacing-md);
  background: white;
  border-radius: var(--border-radius);
  box-shadow: 0 4px 12px rgba(0,0,0,0.03);
  transition: var(--transition);
}

.feature-card:hover {
  transform: translateY(-5px);
}

.feature-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto var(--spacing-md);
  background-color: rgba(79, 70, 229, 0.1);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-accent);
  font-size: 28px;
}

/* COURSES */
.courses-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: var(--spacing-lg);
  margin-top: var(--spacing-md);
}

.course-type h3 {
  margin: 40px 0 24px;
  font-size: 28px;
  color: var(--color-text);
  position: relative;
  padding-bottom: 12px;
}

.course-type h3::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 60px;
  height: 4px;
  background-color: var(--color-accent);
  border-radius: 2px;
}

.course-card {
  background: white;
  border-radius: var(--border-radius);
  overflow: hidden;
  box-shadow: 0 4px 12px rgba(0,0,0,0.05);
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  height: 100%;
}

.course-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 12px 30px rgba(0,0,0,0.1);
}

.course-content {
  padding: var(--spacing-md);
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.course-title {
  font-size: 20px;
  margin-bottom: 8px;
  color: var(--color-text);
}

.course-desc {
  color: var(--color-text-secondary);
  font-size: 14px;
  margin-bottom: 16px;
  flex-grow: 1;
}

.course-price {
  font-size: 14px;
  color: var(--color-text-secondary);
  margin-bottom: 16px;
  line-height: 1.5;
}

.course-price strong {
  color: var(--color-text);
}

/* STEPS */
.steps {
  background-color: var(--color-section-bg);
}

.steps h2 {
  text-align: center;
  margin-bottom: 40px;
  font-size: 36px;
}

.steps-container {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 40px;
  margin-top: 60px;
}

.step {
  display: flex;
  flex-direction: column;
  align-items: center;
  max-width: 220px;
  text-align: center;
}

.step-number {
  width: 40px;
  height: 40px;
  background-color: var(--color-accent);
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
  font-weight: bold;
  font-size: 18px;
}

/* TESTIMONIALS */
.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-lg);
  margin-top: var(--spacing-lg);
}

.testimonial-card {
  background: white;
  padding: var(--spacing-md);
  border-radius: var(--border-radius);
  box-shadow: 0 4px 12px rgba(0,0,0,0.03);
  height: 100%;
  display: flex;
  flex-direction: column;
}

.testimonial-header {
  display: flex;
  align-items: center;
  margin-bottom: 16px;
}

.avatar {
  width: 60px;
  height: 60px;
  border-radius: 50%;
  background-color: #e0e7ff;
  margin-right: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-accent);
  font-weight: bold;
  font-size: 24px;
}

.testimonial-name {
  font-weight: 600;
  font-size: 18px;
}

.testimonial-role {
  font-size: 14px;
  color: var(--color-text-secondary);
}

.stars {
  color: var(--color-success);
  margin: 8px 0;
  font-size: 18px;
}

/* CTA */
.cta {
  background: var(--color-accent);
  color: white;
  text-align: center;
  padding: 80px var(--spacing-md);
}

.cta h2 {
  font-size: 36px;
  margin-bottom: 16px;
}

.cta p {
  max-width: 600px;
  margin: 0 auto 32px;
  font-size: 18px;
  opacity: 0.9;
}

.cta-form {
  max-width: 500px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.cta-form input,
.cta-form select,
.cta-form textarea {
  padding: 16px;
  border: none;
  border-radius: var(--border-radius);
  font-size: 16px;
  background: rgba(255,255,255,0.9);
  transition: var(--transition);
}

.cta-form input:focus,
.cta-form select:focus,
.cta-form textarea:focus {
  outline: 2px solid white;
  background: white;
}

.cta-form .btn {
  background: white;
  color: var(--color-accent);
  font-weight: 700;
  margin-top: 8px;
}

.cta-form .btn:hover {
  background: #f0f0ff;
}

/* FOOTER */
footer {
  background-color: var(--color-section-bg);
  padding: 60px var(--spacing-md) 30px;
  text-align: center;
}

.footer-logo {
  font-size: 28px;
  font-weight: 700;
  color: var(--color-accent);
  margin-bottom: 16px;
  display: block;
}
.footer-logo img {
  width: 180px;
  height: auto;
}

.footer-links {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 40px;
  margin: 40px 0;
}

.footer-col h4 {
  margin-bottom: 16px;
  font-size: 18px;
  color: var(--color-text);
}

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

.footer-col ul li {
  margin-bottom: 8px;
}

.footer-col a {
  color: var(--color-text-secondary);
  text-decoration: none;
  transition: var(--transition);
  font-size: 14px;
}

.footer-col a:hover {
  color: var(--color-accent);
}

.social-icons {
  display: flex;
  justify-content: center;
  gap: 16px;
  margin: 24px 0;
}

.social-icon {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: white;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text);
  text-decoration: none;
  transition: var(--transition);
  font-weight: 600;
  font-size: 14px;
}

.social-icon:hover {
  background: var(--color-accent);
  color: white;
}

.copyright {
  color: var(--color-text-secondary);
  font-size: 14px;
  margin-top: 32px;
}

.copyright a {
  color: var(--color-text-secondary);
  text-decoration: underline;
}

/* FLOATING BUTTON & MODAL */
.floating-button {
  position: fixed;
  bottom: 30px;
  right: 30px;
  z-index: 999;
}

.floating-button button {
  background: var(--color-accent);
  color: white;
  border: none;
  width: 60px;
  height: 60px;
  border-radius: 50%;
  font-size: 24px;
  cursor: pointer;
  box-shadow: 0 4px 12px rgba(79,70,229,0.3);
  transition: var(--transition);
}

.floating-button button:hover {
  transform: scale(1.1);
}

.modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0,0,0,0.5);
  z-index: 1000;
  justify-content: center;
  align-items: center;
}

.modal-content {
  background: white;
  padding: 30px;
  border-radius: 12px;
  width: 90%;
  max-width: 500px;
  position: relative;
  box-shadow: 0 10px 40px rgba(0,0,0,0.2);
}

.close-btn {
  position: absolute;
  top: 10px;
  right: 10px;
  background: none;
  border: none;
  font-size: 24px;
  cursor: pointer;
  color: var(--color-text-secondary);
}

.close-btn:hover {
  color: var(--color-accent);
}

.modal-form {
  margin-top: 20px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.modal-form input,
.modal-form textarea {
  padding: 14px;
  border: 1px solid #ddd;
  border-radius: var(--border-radius);
  font-size: 16px;
}

.modal-form .btn {
  width: 100%;
  padding: 14px;
  font-size: 16px;
}

/* RESPONSIVE */
@media (max-width: 768px) {
  .hero h1 {
    font-size: 36px;
  }
  .hero p {
    font-size: 18px;
  }
  nav ul {
    display: none;
  }
  .steps-container {
    flex-direction: column;
    align-items: center;
  }
  .course-type h3 {
    font-size: 24px;
  }
  .cta-form,
  .modal-form {
    gap: 12px;
  }
  .cta-form input,
  .modal-form input,
  .cta-form textarea,
  .modal-form textarea,
  .cta-form select {
    padding: 14px;
    font-size: 15px;
  }
}