:root {
    --bg-primary: #0b0f19;
    --bg-secondary: #111827;
    --bg-card: #1f2937;
    --text-primary: #f9fafb;
    --text-secondary: #9ca3af;
    --accent: #3b82f6;
    --accent-hover: #2563eb;
    --border-color: #374151;
    --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    color-scheme: dark;
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: 5rem;
    -webkit-text-size-adjust: 100%;
}

body {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-family: var(--font-family);
    line-height: 1.6;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

.container {
    width: 100%;
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

.site-header {
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.brand-logo {
    font-size: 1.35rem;
    font-weight: 700;
    color: var(--text-primary);
    text-decoration: none;
    letter-spacing: -0.02em;
    -webkit-tap-highlight-color: transparent;
}

.nav-links {
    display: flex;
    gap: 1.5rem;
}

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.95rem;
    transition: color 0.2s ease;
    -webkit-tap-highlight-color: transparent;
}

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

.hero-section {
    padding: 6rem 0;
    text-align: center;
    background: radial-gradient(circle at 50% 20%, rgba(59, 130, 246, 0.15), transparent 70%);
}

.hero-title {
    font-size: clamp(2rem, 5vw + 0.5rem, 2.75rem);
    font-weight: 800;
    letter-spacing: -0.03em;
    margin-bottom: 1.25rem;
    line-height: 1.2;
    overflow-wrap: break-word;
    word-break: break-word;
}

.hero-subtitle {
    font-size: clamp(1.05rem, 2.5vw + 0.25rem, 1.2rem);
    color: var(--text-secondary);
    max-width: 680px;
    margin: 0 auto 2rem;
    line-height: 1.6;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 44px;
    padding: 0.75rem 1.75rem;
    font-size: 1rem;
    font-weight: 600;
    border-radius: 6px;
    text-decoration: none;
    transition: background-color 0.2s ease, transform 0.1s ease;
    -webkit-tap-highlight-color: transparent;
}

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

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

.btn-primary:active {
    transform: scale(0.98);
}

.content-section {
    padding: 5rem 0;
}

.content-section h2 {
    font-size: 2rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 3rem;
    letter-spacing: -0.02em;
}

.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(100%, 280px), 1fr));
    gap: 2rem;
}

.card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 2rem;
    transition: border-color 0.2s ease;
}

.card:hover {
    border-color: var(--accent);
}

.card h3 {
    font-size: 1.25rem;
    margin-bottom: 0.75rem;
    color: var(--text-primary);
}

.card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
}

.section-dark {
    background-color: var(--bg-secondary);
    text-align: center;
}

.section-lead {
    color: var(--text-secondary);
    font-size: 1.15rem;
    max-width: 700px;
    margin: 0 auto;
    line-height: 1.6;
}

.contact-container {
    text-align: center;
}

.contact-container p {
    color: var(--text-secondary);
    font-size: 1.05rem;
    max-width: 600px;
    margin: 0 auto;
    line-height: 1.6;
}

.site-footer {
    margin-top: auto;
    background-color: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: 2rem 0;
    text-align: center;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

@media (max-width: 640px) {
    .container {
        padding: 0 1.25rem;
    }

    .site-header {
        padding: 0.85rem 0;
    }

    .header-container {
        flex-direction: column;
        gap: 0.75rem;
        text-align: center;
    }

    .nav-links {
        gap: 1.25rem;
        flex-wrap: wrap;
        justify-content: center;
    }

    .nav-links a {
        font-size: 0.9rem;
        padding: 0.35rem 0.5rem;
    }

    .hero-section {
        padding: 3.5rem 0 2.5rem;
    }

    .hero-title {
        font-size: 1.85rem;
        margin-bottom: 1rem;
    }

    .hero-subtitle {
        font-size: 1rem;
        margin-bottom: 1.5rem;
    }

    .hero-actions .btn {
        width: 100%;
        max-width: 240px;
    }

    .content-section {
        padding: 3.5rem 0;
    }

    .content-section h2 {
        font-size: 1.6rem;
        margin-bottom: 2rem;
    }

    .card-grid {
        grid-template-columns: 1fr;
        gap: 1.25rem;
    }

    .card {
        padding: 1.5rem;
    }

    .section-lead {
        font-size: 1rem;
    }

    .contact-container p {
        font-size: 0.95rem;
    }

    .site-footer {
        padding: 1.5rem 0;
        font-size: 0.85rem;
    }
}