/* retoor <retoor@molodetz.nl> */

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

:root {
    --bg: #f9f9f9;
    --surface: #ffffff;
    --border: #dde1e7;
    --text: #1a1a1a;
    --muted: #5a6472;
    --accent: #2563eb;
    --accent-hover: #1d4ed8;
    --code-bg: #f1f3f5;
    --nav-bg: #1e293b;
    --nav-text: #e2e8f0;
    --nav-hover: #38bdf8;
    --header-bg: #0f172a;
    --header-text: #f8fafc;
    --footer-bg: #1e293b;
    --footer-text: #94a3b8;
    --max-width: 860px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    font-size: 16px;
    line-height: 1.7;
    background: var(--bg);
    color: var(--text);
}

header {
    background: var(--header-bg);
    color: var(--header-text);
    padding: 2.5rem 1.5rem;
    text-align: center;
}

header h1 {
    font-size: 2rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: 0.4rem;
}

header p {
    font-size: 1.05rem;
    color: #94a3b8;
}

nav {
    background: var(--nav-bg);
    border-bottom: 1px solid #0f172a;
}

nav ul {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    list-style: none;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0;
}

nav ul li a {
    display: block;
    padding: 0.75rem 1.1rem;
    color: var(--nav-text);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    transition: color 0.15s;
}

nav ul li a:hover,
nav ul li a.active {
    color: var(--nav-hover);
}

main {
    max-width: var(--max-width);
    margin: 2.5rem auto;
    padding: 0 1.5rem 3rem;
}

main section {
    margin-bottom: 2.5rem;
}

h2 {
    font-size: 1.45rem;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 0.75rem;
    padding-bottom: 0.35rem;
    border-bottom: 2px solid var(--border);
}

h3 {
    font-size: 1.1rem;
    font-weight: 600;
    margin: 1.5rem 0 0.5rem;
    color: var(--text);
}

p {
    margin-bottom: 0.9rem;
    color: var(--text);
}

ul, ol {
    margin: 0.5rem 0 1rem 1.5rem;
}

li {
    margin-bottom: 0.35rem;
}

a {
    color: var(--accent);
    text-decoration: none;
}

a:hover {
    color: var(--accent-hover);
    text-decoration: underline;
}

code {
    font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
    font-size: 0.875em;
    background: var(--code-bg);
    border: 1px solid var(--border);
    border-radius: 4px;
    padding: 0.15em 0.4em;
}

pre {
    background: var(--code-bg);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 1.1rem 1.3rem;
    overflow-x: auto;
    margin: 0.75rem 0 1.25rem;
}

pre code {
    background: none;
    border: none;
    padding: 0;
    font-size: 0.875rem;
    line-height: 1.6;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin: 0.75rem 0 1.25rem;
    font-size: 0.92rem;
}

th {
    background: var(--code-bg);
    border: 1px solid var(--border);
    padding: 0.55rem 0.9rem;
    text-align: left;
    font-weight: 600;
}

td {
    border: 1px solid var(--border);
    padding: 0.5rem 0.9rem;
    vertical-align: top;
}

tr:nth-child(even) td {
    background: #f7f9fb;
}

.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1.2rem;
    margin: 1.2rem 0;
}

.card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 1.2rem 1.3rem;
}

.card h3 {
    margin-top: 0;
    font-size: 1rem;
    color: var(--accent);
}

.card p {
    font-size: 0.9rem;
    color: var(--muted);
    margin-bottom: 0;
}

.callout {
    background: #eff6ff;
    border-left: 4px solid var(--accent);
    border-radius: 0 6px 6px 0;
    padding: 0.85rem 1.1rem;
    margin: 0.75rem 0 1.25rem;
    font-size: 0.95rem;
    color: #1e3a5f;
}

.callout.warning {
    background: #fffbeb;
    border-left-color: #f59e0b;
    color: #78350f;
}

footer {
    background: var(--footer-bg);
    color: var(--footer-text);
    text-align: center;
    padding: 1.5rem 1rem;
    font-size: 0.85rem;
    margin-top: 3rem;
}

@media (max-width: 600px) {
    header h1 { font-size: 1.5rem; }
    nav ul li a { padding: 0.6rem 0.75rem; font-size: 0.82rem; }
    main { padding: 0 1rem 2rem; }
}