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

:root {
    --bg: #0b0b0c;
    --surface: #141416;
    --surface-raised: #18181c;
    --border: #26262a;
    --border-strong: #35353b;
    --text: #f5f5f6;
    --text-muted: #8a8a92;
    --text-dim: #5a5a62;
    --accent: #f5f5f6;
    --radius: 10px;
}

html, body {
    background: var(--bg);
    color: var(--text);
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Arial, sans-serif;
    font-size: 16px;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
    min-height: 100vh;
}

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

.num {
    font-family: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, monospace;
    font-weight: 500;
    font-feature-settings: "tnum";
    color: var(--text);
}

.page {
    max-width: 860px;
    margin: 0 auto;
    padding: 6rem 1.5rem 5rem;
}

/* Hero */
.hero {
    text-align: left;
    margin-bottom: 5rem;
    border-bottom: 1px solid var(--border);
    padding-bottom: 3rem;
}

.eyebrow {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.75rem;
    font-weight: 500;
    letter-spacing: 0.2em;
    color: var(--text-muted);
    text-transform: uppercase;
    margin-bottom: 1.5rem;
}

.hero h1 {
    font-size: clamp(2.25rem, 5.5vw, 3.5rem);
    font-weight: 700;
    letter-spacing: -0.025em;
    line-height: 1.08;
    margin-bottom: 1.5rem;
    color: var(--text);
}

.hero .lede {
    font-size: 1.15rem;
    color: var(--text-muted);
    line-height: 1.6;
    max-width: 60ch;
}

.hero .lede strong {
    color: var(--text);
    font-weight: 600;
}

/* Section scaffolding */
.section {
    margin-bottom: 5rem;
}

.section-title {
    font-size: 0.85rem;
    font-family: 'JetBrains Mono', monospace;
    font-weight: 500;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--text-muted);
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border);
}

.prose {
    color: var(--text-muted);
    max-width: 65ch;
    font-size: 1.05rem;
    line-height: 1.75;
    margin-bottom: 1.5rem;
}

.prose:last-child {
    margin-bottom: 0;
}

.prose strong {
    color: var(--text);
    font-weight: 600;
}

/* Cards */
.cards {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.card {
    display: block;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.75rem 1.75rem 1.5rem;
    transition: border-color 150ms ease, background 150ms ease, transform 150ms ease;
}

.card:hover {
    background: var(--surface-raised);
    border-color: var(--border-strong);
}

.card-head {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.card-num {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.8rem;
    letter-spacing: 0.1em;
    color: var(--text-dim);
    font-weight: 500;
}

.card-arrow {
    font-size: 1.1rem;
    color: var(--text-dim);
    transition: color 150ms ease, transform 150ms ease;
}

.card:hover .card-arrow {
    color: var(--text);
    transform: translate(2px, -2px);
}

.card-title {
    font-size: 1.4rem;
    font-weight: 600;
    letter-spacing: -0.015em;
    color: var(--text);
    margin-bottom: 0.75rem;
    line-height: 1.25;
}

.card-desc {
    font-size: 1rem;
    color: var(--text-muted);
    line-height: 1.65;
    margin-bottom: 1.25rem;
}

.card-foot {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.72rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--text-dim);
    padding-top: 1rem;
    border-top: 1px solid var(--border);
}

/* Tools */
.tools {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.tool {
    display: block;
    padding: 1rem 1.25rem;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 8px;
    transition: background 150ms ease, border-color 150ms ease;
}

.tool:hover {
    background: var(--surface-raised);
    border-color: var(--border-strong);
}

.tool-name {
    font-weight: 500;
    color: var(--text);
    margin-bottom: 0.2rem;
}

.tool-desc {
    font-size: 0.9rem;
    color: var(--text-muted);
}

/* Outro */
.outro {
    margin-top: 6rem;
    margin-bottom: 0;
    padding-top: 3rem;
    border-top: 1px solid var(--border);
}

.closer {
    font-size: 1.2rem;
    color: var(--text-muted);
    line-height: 1.7;
    max-width: 55ch;
    margin-bottom: 2rem;
}

.closer strong {
    color: var(--text);
}

.footer-line {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.8rem;
    color: var(--text-dim);
    letter-spacing: 0.05em;
}

.footer-line a {
    color: var(--text-dim);
    text-decoration: underline;
    text-underline-offset: 3px;
}

.footer-line a:hover {
    color: var(--text);
}

/* Responsive */
@media (max-width: 720px) {
    .page {
        padding: 3.5rem 1.25rem 3rem;
    }
    .hero {
        margin-bottom: 3.5rem;
        padding-bottom: 2rem;
    }
    .section {
        margin-bottom: 3.5rem;
    }
    .card {
        padding: 1.5rem 1.25rem 1.25rem;
    }
    .card-title {
        font-size: 1.2rem;
    }
    .outro {
        margin-top: 4rem;
    }
}