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

:root {
    --bg1: #0f172a;
    --bg2: #334155;
    --card: #ffffff;
    --text: #333333;
    --muted: #666666;
    --accent: #1f2937;
    --shadow: rgba(0,0,0,0.2);
    --shadowHover: rgba(0,0,0,0.3);
    --radius: 15px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--text);
    background: linear-gradient(135deg, var(--bg1) 0%, var(--bg2) 100%);
    min-height: 100vh;
}

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

header {
    text-align: center;
    color: white;
    padding: 1.75rem 0;
}

header h1 {
    font-size: 2.4rem;
    margin-bottom: 0.5rem;
    text-shadow: 0 2px 4px rgba(0,0,0,0.3);
}

header p {
    font-size: 1.05rem;
    opacity: 0.9;
}

.docs-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 1rem;
    margin-top: 1rem;
}

.doc-card {
    background: var(--card);
    border-radius: var(--radius);
    padding: 1.2rem;
    box-shadow: 0 10px 30px var(--shadow);
    transition: transform 0.3s, box-shadow 0.3s;
}

.doc-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 40px var(--shadowHover);
}

.icon {
    font-size: 2.4rem;
    margin-bottom: 0.6rem;
}

.doc-card h2 {
    color: var(--accent);
    margin-bottom: 0.6rem;
    font-size: 1.5rem;
}

.doc-card p {
    color: var(--muted);
    margin-bottom: 1rem;
    line-height: 1.6;
}

.doc-card .features {
    list-style: none;
    margin-bottom: 1rem;
}

.doc-card .features li {
    padding: 0.25rem 0;
    color: #555;
    position: relative;
    padding-left: 1.5rem;
}

.doc-card .features li:before {
    content: "✓";
    position: absolute;
    left: 0;
    color: #28a745;
    font-weight: bold;
}

.doc-card a {
    display: inline-block;
    background: linear-gradient(135deg, var(--bg1) 0%, var(--bg2) 100%);
    color: white;
    padding: 0.65rem 1.4rem;
    border-radius: 25px;
    text-decoration: none;
    transition: opacity 0.3s;
    font-weight: 500;
}

.doc-card a:hover {
    opacity: 0.9;
}

.callout {
    margin-top: 1rem;
    background: rgba(255,255,255,0.12);
    border: 1px solid rgba(255,255,255,0.18);
    color: rgba(255,255,255,0.92);
    border-radius: 12px;
    padding: 0.9rem 1rem;
}

.callout code {
    background: rgba(0,0,0,0.25);
    padding: 0.15rem 0.35rem;
    border-radius: 6px;
    color: #fff;
}

footer {
    text-align: center;
    color: white;
    padding: 1rem 0;
    margin-top: 1rem;
    opacity: 0.85;
}

footer a {
    color: white;
    font-weight: 600;
}

@media (max-width: 768px) {
    header h1 {
        font-size: 2rem;
    }

    .docs-grid {
        grid-template-columns: 1fr;
    }
}