:root {
    --platform-bg: #0f172a;
    --platform-surface: #ffffff;
    --platform-text: #0f172a;
    --platform-muted: #64748b;
    --platform-accent: #2563eb;
    --platform-accent-hover: #1d4ed8;
    --platform-border: #e2e8f0;
    --platform-radius: 16px;
    --platform-shell: min(1120px, calc(100% - 40px));
}

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

body {
    margin: 0;
    font-family: "Segoe UI", system-ui, -apple-system, sans-serif;
    color: var(--platform-text);
    background: linear-gradient(180deg, #f8fafc 0%, #eef2ff 100%);
    min-height: 100vh;
}

.site-shell {
    width: var(--platform-shell);
    margin-inline: auto;
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 10;
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--platform-border);
}

.site-header .site-shell {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 0;
}

.site-logo {
    font-weight: 800;
    font-size: 1.05rem;
    color: var(--platform-text);
    text-decoration: none;
    letter-spacing: -0.02em;
}

.site-nav a {
    color: var(--platform-muted);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.95rem;
}

.site-nav a:hover {
    color: var(--platform-accent);
}

.site-main {
    padding-bottom: 64px;
}

.hero {
    padding: 72px 0 48px;
    text-align: center;
}

.hero-eyebrow {
    display: inline-block;
    margin: 0 0 12px;
    padding: 6px 12px;
    border-radius: 999px;
    background: #dbeafe;
    color: #1e40af;
    font-size: 0.82rem;
    font-weight: 700;
    letter-spacing: 0.04em;
    text-transform: uppercase;
}

.hero h1 {
    margin: 0 0 16px;
    font-size: clamp(2rem, 5vw, 3rem);
    line-height: 1.1;
    letter-spacing: -0.03em;
}

.hero-lead {
    margin: 0 auto 28px;
    max-width: 640px;
    color: var(--platform-muted);
    font-size: 1.08rem;
    line-height: 1.6;
}

.hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    justify-content: center;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 20px;
    border-radius: 12px;
    font-weight: 700;
    text-decoration: none;
    transition: background 0.18s ease, color 0.18s ease, border-color 0.18s ease;
}

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

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

.btn-secondary {
    background: #fff;
    color: var(--platform-text);
    border: 1px solid var(--platform-border);
}

.btn-secondary:hover {
    border-color: #cbd5e1;
}

.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 20px;
}

.feature-card {
    background: var(--platform-surface);
    border: 1px solid var(--platform-border);
    border-radius: var(--platform-radius);
    padding: 24px;
    box-shadow: 0 10px 30px rgba(15, 23, 42, 0.04);
}

.feature-card h2 {
    margin: 0 0 10px;
    font-size: 1.1rem;
}

.feature-card p {
    margin: 0;
    color: var(--platform-muted);
    line-height: 1.55;
    font-size: 0.95rem;
}

.feature-card code {
    font-size: 0.85em;
    background: #f1f5f9;
    padding: 2px 6px;
    border-radius: 6px;
}

.site-footer {
    border-top: 1px solid var(--platform-border);
    padding: 24px 0;
    color: var(--platform-muted);
    font-size: 0.9rem;
}

.site-footer p {
    margin: 0;
}

@media (max-width: 640px) {
    .hero {
        padding-top: 48px;
    }

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