:root {
    --primary: #0d6efd;
    --primary-dark: #0a58ca;
    --secondary: #198754;
    --dark: #0f172a;
    --gray: #6c757d;
    --light: #f8f9fa;
    --white: #ffffff;
}

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

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

a {
    text-decoration: none;
    color: inherit;
}

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

.hero {
    background: linear-gradient(135deg, var(--dark) 0%, #1e293b 100%);
    color: var(--white);
    min-height: 90vh;
    padding-bottom: 80px;
}

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 24px 48px;
    max-width: 1400px;
    margin: 0 auto;
}

.nav-brand {
    font-size: 1.6rem;
    font-weight: 800;
    color: var(--white);
    letter-spacing: -0.5px;
}

.nav-links {
    display: flex;
    gap: 32px;
    align-items: center;
}

.nav-links a {
    color: rgba(255, 255, 255, 0.85);
    font-weight: 500;
    transition: color 0.2s;
}

.nav-links a:hover {
    color: var(--white);
}

.hero-content {
    max-width: 800px;
    margin: 80px auto 0;
    text-align: center;
    padding: 0 24px;
}

.hero h1 {
    font-size: 3rem;
    font-weight: 800;
    line-height: 1.15;
    margin-bottom: 24px;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: rgba(255, 255, 255, 0.8);
    margin-bottom: 40px;
}

.hero-actions {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 16px;
}

.hero-note {
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.9rem;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 24px;
    border-radius: 8px;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.2s;
    border: 2px solid transparent;
}

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

.btn-primary:hover {
    background: var(--primary-dark);
    border-color: var(--primary-dark);
}

.btn-secondary {
    background: transparent;
    color: var(--white);
    border-color: rgba(255, 255, 255, 0.5);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--white);
}

.btn-outline {
    background: transparent;
    color: var(--white);
    border-color: rgba(255, 255, 255, 0.4);
    padding: 8px 16px;
    font-size: 0.95rem;
}

.btn-outline:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--white);
}

.btn-large {
    padding: 16px 32px;
    font-size: 1.1rem;
}

.features {
    padding: 80px 0;
    background: var(--light);
}

.features h2,
.how-it-works h2,
.download h2 {
    text-align: center;
    font-size: 2.25rem;
    font-weight: 700;
    margin-bottom: 48px;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 32px;
}

.feature-card {
    background: var(--white);
    border-radius: 16px;
    padding: 32px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
    transition: transform 0.2s, box-shadow 0.2s;
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.1);
}

.feature-icon {
    font-size: 2.5rem;
    margin-bottom: 16px;
}

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

.feature-card p {
    color: var(--gray);
}

.how-it-works {
    padding: 80px 0;
}

.steps {
    display: flex;
    justify-content: center;
    gap: 48px;
    flex-wrap: wrap;
}

.step {
    text-align: center;
    max-width: 280px;
}

.step-number {
    width: 56px;
    height: 56px;
    background: var(--primary);
    color: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 700;
    margin: 0 auto 20px;
}

.step h3 {
    font-size: 1.2rem;
    margin-bottom: 8px;
}

.step p {
    color: var(--gray);
}

.download {
    padding: 80px 0;
    background: var(--dark);
    color: var(--white);
    text-align: center;
}

.download-subtitle {
    color: rgba(255, 255, 255, 0.75);
    margin-bottom: 32px;
}

.download-note {
    color: rgba(255, 255, 255, 0.55);
    margin-top: 16px;
    font-size: 0.9rem;
}

.footer {
    padding: 40px 0;
    background: #0a0f1c;
    color: rgba(255, 255, 255, 0.6);
    text-align: center;
}

.footer p {
    margin-bottom: 8px;
}

.footer-link {
    color: var(--primary);
}

.footer-link:hover {
    text-decoration: underline;
}

@media (max-width: 768px) {
    .navbar {
        flex-direction: column;
        gap: 16px;
        padding: 24px;
    }

    .hero h1 {
        font-size: 2rem;
    }

    .hero-subtitle {
        font-size: 1rem;
    }

    .hero-actions {
        flex-direction: column;
        align-items: stretch;
    }

    .features h2,
    .how-it-works h2,
    .download h2 {
        font-size: 1.75rem;
    }
}