:root {
    --primary-color: #2a74b5;
    --primary-dark: #1d5a8c;
    --text-dark: #2c3e50;
    --text-light: #ffffff;
    --bg-light: #f8f9fa;
    --border-color: #e9ecef;
    --shadow: 0 4px 15px rgba(0, 0, 0, 0.08);
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    background-color: #ffffff;
}

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

.header {
    background-color: var(--text-light);
    color: var(--text-light);
    padding: 15px 0;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow);
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-light);
}

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

.nav a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s;
}

.nav a:hover {
    color: var(--text-light);
}

.hero {
    background: linear-gradient(135deg, var(--primary-color), #6a11cb);
    color: var(--text-light);
    padding: 100px 0 80px;
    text-align: center;
}

.hero h1 {
    font-size: 3rem;
    margin-bottom: 20px;
    font-weight: 700;
}

.hero .subtitle {
    font-size: 1.2rem;
    max-width: 600px;
    margin: 0 auto 40px;
    opacity: 0.9;
}

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

.btn {
    display: inline-block;
    padding: 15px 30px;
    text-decoration: none;
    border-radius: 50px;
    font-weight: 600;
    transition: all 0.3s;
    border: 2px solid transparent;
}

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

.btn-primary:hover {
    background-color: #e9ecef;
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.15);
}

.btn-secondary {
    background-color: transparent;
    color: var(--text-light);
    border-color: var(--text-light);
}

.btn-secondary:hover {
    background-color: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
}

.features, .how-it-works, .benefits, .demo, .cta {
    padding: 80px 0;
}

.features h2, .how-it-works h2, .benefits h2, .demo h2, .cta h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 60px;
    color: var(--text-dark);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
}

.feature-card {
    background: #ffffff;
    padding: 30px;
    border-radius: 12px;
    text-align: center;
    box-shadow: var(--shadow);
    transition: transform 0.3s, box-shadow 0.3s;
    border: 1px solid var(--border-color);
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.12);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: 20px;
}

.feature-card h3 {
    margin-bottom: 15px;
    color: var(--primary-color);
}

.how-it-works .steps {
    display: flex;
    flex-direction: column;
    gap: 40px;
    max-width: 800px;
    margin: 0 auto;
}

.step {
    background: #ffffff;
    padding: 40px 30px;
    border-radius: 12px;
    box-shadow: var(--shadow);
    position: relative;
    border-left: 5px solid var(--primary-color);
}

.step-number {
    position: absolute;
    top: -15px;
    left: 30px;
    background: var(--primary-color);
    color: var(--text-light);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1.2rem;
}

.step h3 {
    margin-bottom: 15px;
    color: var(--text-dark);
}

.benefits-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 30px;
}

.benefit-card {
    background: var(--bg-light);
    padding: 30px;
    border-radius: 12px;
    text-align: center;
    border: 1px solid var(--border-color);
    transition: transform 0.3s;
}

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

.benefit-card h3 {
    margin-bottom: 15px;
    color: var(--primary-dark);
}

.demo-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 25px;
}

.demo-card {
    background: #ffffff;
    padding: 25px;
    border-radius: 10px;
    box-shadow: var(--shadow);
    border: 1px solid var(--border-color);
}

.demo-card h3 {
    margin-bottom: 15px;
    color: var(--primary-color);
}

.demo-card ul {
    list-style: none;
}

.demo-card li {
    padding: 5px 0;
    color: #555;
}

.demo-card li::before {
    content: "✓";
    color: #28a745;
    margin-right: 8px;
    font-weight: bold;
}

.cta {
    background: var(--primary-color);
    color: var(--text-light);
    text-align: center;
}

.cta h2 {
    margin-bottom: 20px;
}

.cta p {
    margin-bottom: 30px;
    font-size: 1.1rem;
    opacity: 0.9;
}

.footer {
    background: #2c3e50;
    color: #adb5bd;
    text-align: center;
    padding: 30px 0;
}

/* Адаптивность */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 2.2rem;
    }

    .nav {
        display: none;
    }

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

    .features-grid, .benefits-grid, .demo-grid {
        grid-template-columns: 1fr;
    }

    .how-it-works .steps {
        padding: 0 20px;
    }

    .step-number {
        left: 20px;
    }
}

@media (max-width: 480px) {
    .hero {
        padding: 80px 0 60px;
    }

    .hero h1 {
        font-size: 1.8rem;
    }

    .features, .how-it-works, .benefits, .demo, .cta {
        padding: 50px 0;
    }

    .feature-card, .benefit-card, .demo-card {
        padding: 20px;
    }
}