:root {
  --bg: #ffffff;
  --text: #1a1a1a;
  --primary: #0056b3;
  --primary-hover: #004494;
  --card-bg: #f8f9fa;
  --border: #dee2e6;
  --shadow: 0 2px 8px rgba(0,0,0,0.08);
  --radius: 12px;
  --max-width: 1200px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #121212;
    --text: #e0e0e0;
    --primary: #4da3ff;
    --primary-hover: #6bb5ff;
    --card-bg: #1e1e1e;
    --border: #333;
    --shadow: 0 2px 8px rgba(0,0,0,0.3);
  }
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  transition: background 0.3s, color 0.3s;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
  border-radius: var(--radius);
}

a {
  color: var(--primary);
  text-decoration: none;
}
a:hover {
  text-decoration: underline;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
}

/* Header */
header {
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(8px);
  background: color-mix(in srgb, var(--bg) 90%, transparent);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 0;
  flex-wrap: wrap;
  gap: 12px;
}

.logo {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--text);
}
.logo span {
  color: var(--primary);
}

nav ul {
  list-style: none;
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
}

nav a {
  color: var(--text);
  font-weight: 500;
  font-size: 0.95rem;
}
nav a:hover {
  color: var(--primary);
}

/* Hero */
.hero {
  padding: 80px 0;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}

.hero h1 {
  font-size: 2.6rem;
  line-height: 1.2;
  margin-bottom: 20px;
}

.hero p {
  font-size: 1.15rem;
  margin-bottom: 32px;
  opacity: 0.85;
}

.btn {
  display: inline-block;
  background: var(--primary);
  color: #fff;
  padding: 14px 32px;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 1rem;
  border: none;
  cursor: pointer;
  transition: background 0.2s, transform 0.1s;
}
.btn:hover {
  background: var(--primary-hover);
  transform: translateY(-1px);
  text-decoration: none;
}

.btn-outline {
  background: transparent;
  color: var(--primary);
  border: 2px solid var(--primary);
}
.btn-outline:hover {
  background: var(--primary);
  color: #fff;
}

/* Sections */
section {
  padding: 64px 0;
}

h2 {
  font-size: 2rem;
  margin-bottom: 16px;
}

h3 {
  font-size: 1.3rem;
  margin-bottom: 12px;
}

.section-subtitle {
  opacity: 0.7;
  margin-bottom: 40px;
  font-size: 1.1rem;
}

/* Grid */
.grid-3 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}

.card {
  background: var(--card-bg);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--shadow);
  transition: transform 0.2s;
}
.card:hover {
  transform: translateY(-4px);
}

/* Advantages */
.advantages ul {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
}
.advantages li {
  background: var(--card-bg);
  padding: 20px;
  border-radius: var(--radius);
  border-left: 4px solid var(--primary);
  font-weight: 500;
}

/* Reviews */
.review-card {
  background: var(--card-bg);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--shadow);
}
.review-card .author {
  font-weight: 700;
  margin-top: 16px;
}
.review-card .role {
  font-size: 0.9rem;
  opacity: 0.7;
}

/* FAQ */
.faq-item {
  background: var(--card-bg);
  border-radius: var(--radius);
  padding: 24px;
  margin-bottom: 16px;
  box-shadow: var(--shadow);
}
.faq-item h3 {
  margin-bottom: 8px;
  color: var(--primary);
}
.faq-item p {
  opacity: 0.85;
}

/* Partner block */
.partner {
  background: linear-gradient(135deg, var(--primary) 0%, #003d82 100%);
  color: #fff;
  border-radius: var(--radius);
  padding: 48px;
  text-align: center;
}
.partner h2 {
  color: #fff;
}
.partner p {
  opacity: 0.9;
  max-width: 600px;
  margin: 0 auto 24px;
}
.partner .btn {
  background: #fff;
  color: var(--primary);
}
.partner .btn:hover {
  background: #e0e0e0;
}

/* Form */
.form-group {
  margin-bottom: 20px;
}
.form-group label {
  display: block;
  margin-bottom: 6px;
  font-weight: 500;
}
.form-group input,
.form-group textarea {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg);
  color: var(--text);
  font-size: 1rem;
  font-family: inherit;
}
.form-group input:focus,
.form-group textarea:focus {
  outline: 2px solid var(--primary);
  border-color: transparent;
}

/* Footer */
footer {
  background: var(--card-bg);
  border-top: 1px solid var(--border);
  padding: 48px 0 24px;
  margin-top: 64px;
}
.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 32px;
  margin-bottom: 32px;
}
footer h4 {
  margin-bottom: 12px;
  font-size: 1.1rem;
}
footer ul {
  list-style: none;
}
footer li {
  margin-bottom: 8px;
}
footer a {
  color: var(--text);
  opacity: 0.8;
}
footer a:hover {
  opacity: 1;
}
.footer-bottom {
  border-top: 1px solid var(--border);
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 0.9rem;
  opacity: 0.7;
}

/* Responsive */
@media (max-width: 768px) {
  .hero {
    grid-template-columns: 1fr;
    padding: 48px 0;
  }
  .hero h1 {
    font-size: 1.9rem;
  }
  h2 {
    font-size: 1.5rem;
  }
  .header-inner {
    flex-direction: column;
    align-items: flex-start;
  }
  nav ul {
    gap: 16px;
  }
  .partner {
    padding: 32px 20px;
  }
}