/* SPDX-License-Identifier: CC0-1.0 */
/* Copyright (c) 2026 sol pbc */

:root {
    --bg: #fafaf8;
    --text: #1a1a1a;
    --muted: #6b6b6b;
    --accent: #b85c38;
    --accent-hover: #a04e2f;
    --code-bg: #1e1e2e;
    --code-text: #cdd6f4;
    --code-comment: #6c7086;
    --border: #e0ddd8;
    --card-bg: #f4f3f0;
    --max-width: 720px;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
    color: var(--text);
    background: var(--bg);
    line-height: 1.7;
    padding: 2rem 1.5rem;
    -webkit-font-smoothing: antialiased;
}

main {
    max-width: var(--max-width);
    margin: 0 auto;
}

/* navigation */
nav.site-nav {
    max-width: var(--max-width);
    margin: 0 auto 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.9rem;
}

nav.site-nav a {
    color: var(--muted);
    text-decoration: none;
}

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

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

/* typography */
h1 {
    font-size: 2.5rem;
    font-weight: 700;
    letter-spacing: -0.03em;
    line-height: 1.2;
    margin-bottom: 0.25rem;
}

.subtitle {
    font-size: 1.25rem;
    color: var(--muted);
    margin-bottom: 3rem;
}

h2 {
    font-size: 1.35rem;
    font-weight: 600;
    margin-top: 3.5rem;
    margin-bottom: 1rem;
    letter-spacing: -0.01em;
}

h3 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-top: 2rem;
    margin-bottom: 0.75rem;
}

p {
    margin-bottom: 1rem;
}

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

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

/* header */
header {
    margin-bottom: 3rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid var(--border);
}

/* sections */
section {
    margin-bottom: 2rem;
}

/* code blocks */
pre {
    background: var(--code-bg);
    color: var(--code-text);
    padding: 1.25rem 1.5rem;
    border-radius: 6px;
    overflow-x: auto;
    font-size: 0.85rem;
    line-height: 1.6;
    margin: 1.25rem 0;
    font-family: 'SF Mono', 'Fira Code', 'Fira Mono', Menlo, Consolas, monospace;
}

code {
    font-family: 'SF Mono', 'Fira Code', 'Fira Mono', Menlo, Consolas, monospace;
    font-size: 0.88em;
}

p code, li code {
    background: var(--card-bg);
    padding: 0.15em 0.4em;
    border-radius: 3px;
    font-size: 0.85em;
}

/* steps */
.steps {
    counter-reset: step;
    list-style: none;
    margin: 1.5rem 0;
}

.steps li {
    counter-increment: step;
    padding: 0.75rem 0 0.75rem 3rem;
    position: relative;
    border-bottom: 1px solid var(--border);
}

.steps li:last-child {
    border-bottom: none;
}

.steps li::before {
    content: counter(step);
    position: absolute;
    left: 0;
    top: 0.75rem;
    width: 2rem;
    height: 2rem;
    background: var(--accent);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.85rem;
    font-weight: 600;
}

.steps li strong {
    display: inline;
}

/* principles grid */
.principles {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.25rem;
    margin: 1.5rem 0;
}

.principle {
    background: var(--card-bg);
    padding: 1.25rem;
    border-radius: 6px;
}

.principle strong {
    display: block;
    margin-bottom: 0.35rem;
    font-size: 0.95rem;
}

.principle p {
    font-size: 0.9rem;
    color: var(--muted);
    margin-bottom: 0;
    line-height: 1.5;
}

/* progression table */
table {
    width: 100%;
    border-collapse: collapse;
    margin: 1.25rem 0;
    font-size: 0.95rem;
}

th {
    text-align: left;
    padding: 0.6rem 1rem;
    border-bottom: 2px solid var(--border);
    font-weight: 600;
}

td {
    padding: 0.6rem 1rem;
    border-bottom: 1px solid var(--border);
}

td code {
    font-weight: 600;
}

/* not-list */
.not-list {
    list-style: none;
    margin: 1rem 0;
}

.not-list li {
    padding: 0.4rem 0;
    padding-left: 1.5rem;
    position: relative;
}

.not-list li::before {
    content: "\2715";
    position: absolute;
    left: 0;
    color: var(--accent);
    font-weight: bold;
}

/* CTA link */
.cta {
    display: inline-block;
    margin-top: 2rem;
    padding: 0.75rem 1.5rem;
    background: var(--accent);
    color: white;
    border-radius: 6px;
    font-weight: 600;
    font-size: 1rem;
    text-decoration: none;
    transition: background 0.2s;
}

.cta:hover {
    background: var(--accent-hover);
    color: white;
    text-decoration: none;
}

/* footer */
footer {
    margin-top: 4rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border);
    color: var(--muted);
    font-size: 0.85rem;
}

footer a {
    color: var(--muted);
}

footer a:hover {
    color: var(--accent);
}

/* spec page specifics */
.spec-meta {
    color: var(--muted);
    font-size: 0.9rem;
    margin-bottom: 2rem;
}

.field-table {
    font-size: 0.9rem;
}

.field-table td:first-child {
    font-weight: 600;
    white-space: nowrap;
    width: 30%;
}

.note {
    background: var(--card-bg);
    border-left: 3px solid var(--accent);
    padding: 1rem 1.25rem;
    margin: 1.25rem 0;
    font-size: 0.9rem;
    border-radius: 0 4px 4px 0;
}

/* diagram */
.diagram {
    text-align: center;
    overflow-x: auto;
}

.diagram pre {
    display: inline-block;
    text-align: left;
    font-size: 0.8rem;
    line-height: 1.5;
}

/* responsive */
@media (max-width: 600px) {
    h1 {
        font-size: 2rem;
    }

    .subtitle {
        font-size: 1.1rem;
    }

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

    pre {
        font-size: 0.75rem;
        padding: 1rem;
    }

    .steps li {
        padding-left: 2.5rem;
    }
}