/* ──────────────────────────────────────────────────────────────────────────
   codeministry / blog
   Editorial typography on the parchment-and-walnut palette derived from
   the librarian banner artwork.
   ────────────────────────────────────────────────────────────────────────── */

:root {
    --bg: #f4ecdd;
    --bg-deep: #ebe0cc;
    --surface: #fbf5e7;
    --surface-2: rgba(251, 245, 231, 0.78);
    --ink: #1b1714;
    --ink-soft: #3a3128;
    --ink-muted: #6b5e4f;
    --rule: #d9cdb5;
    --rule-soft: #e5dcc8;
    --accent: #b8893a;
    --accent-deep: #8a6325;
    --accent-glow: rgba(184, 137, 58, 0.18);
    --shadow:
        0 1px 1px rgba(27, 23, 20, 0.05),
        0 12px 30px -16px rgba(27, 23, 20, 0.25);
    --shadow-soft: 0 8px 30px -20px rgba(27, 23, 20, 0.5);
    --grain: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='240' height='240'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2' seed='4'/><feColorMatrix values='0 0 0 0 0.42 0 0 0 0 0.31 0 0 0 0 0.18 0 0 0 0.32 0'/></filter><rect width='100%25' height='100%25' filter='url(%23n)' opacity='0.55'/></svg>");

    --serif:
        'Iowan Old Style', 'Palatino Linotype', 'Book Antiqua', Palatino,
        'Hoefler Text', Garamond, 'Times New Roman', serif;
    --sans:
        system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', Arial,
        sans-serif;
    --mono:
        ui-monospace, SFMono-Regular, 'SF Mono', Menlo, Consolas,
        'Liberation Mono', monospace;

    --container: min(92rem, 92vw);
    --measure: calc(var(--container) - 10rem);
    --nav-h: 3.5rem;

    --ease: cubic-bezier(0.32, 0.72, 0.18, 1);
}

[data-theme='dark'] {
    --bg: #1a1612;
    --bg-deep: #120f0c;
    --surface: #231d17;
    --surface-2: rgba(35, 29, 23, 0.78);
    --ink: #efe3cc;
    --ink-soft: #d7c9ae;
    --ink-muted: #a89478;
    --rule: #3a2f25;
    --rule-soft: #2c241c;
    --accent: #d8ae5c;
    --accent-deep: #f0c870;
    --accent-glow: rgba(216, 174, 92, 0.22);
    --shadow:
        0 1px 1px rgba(0, 0, 0, 0.35), 0 18px 40px -20px rgba(0, 0, 0, 0.7);
    --shadow-soft: 0 8px 40px -22px rgba(0, 0, 0, 0.8);
    --grain: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='240' height='240'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2' seed='4'/><feColorMatrix values='0 0 0 0 0.85 0 0 0 0 0.7 0 0 0 0 0.42 0 0 0 0.06 0'/></filter><rect width='100%25' height='100%25' filter='url(%23n)' opacity='0.7'/></svg>");
}

/* ─── Reset & base ─────────────────────────────────────────────────────── */

*,
*::before,
*::after {
    box-sizing: border-box;
}
html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}
body {
    margin: 0;
    font-family: var(--sans);
    font-size: 17px;
    line-height: 1.65;
    color: var(--ink);
    background: var(--bg);
    background-image: var(--grain);
    background-size: 240px 240px;
    background-attachment: fixed;
    font-feature-settings: 'kern', 'liga', 'calt';
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
    transition:
        background-color 280ms var(--ease),
        color 280ms var(--ease);
}

::selection {
    background: var(--accent);
    color: var(--bg);
}
img {
    max-width: 100%;
    height: auto;
    display: block;
}

a {
    color: inherit;
    text-decoration-color: var(--accent);
    text-decoration-thickness: 1px;
    text-underline-offset: 3px;
    transition:
        color 160ms var(--ease),
        text-decoration-color 160ms var(--ease);
}
a:hover,
a:focus-visible {
    color: var(--accent-deep);
    text-decoration-color: currentColor;
}

:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 3px;
    border-radius: 2px;
}

h1,
h2,
h3,
h4 {
    font-family: var(--serif);
    font-weight: 500;
    color: var(--ink);
    letter-spacing: -0.005em;
    margin: 0;
}

p {
    margin: 0 0 1.05em;
}
code,
pre,
kbd,
samp {
    font-family: var(--mono);
}

.skip {
    position: absolute;
    left: -9999px;
    top: 0;
    background: var(--ink);
    color: var(--bg);
    padding: 0.5rem 0.85rem;
    z-index: 100;
}
.skip:focus {
    left: 0.5rem;
    top: 0.5rem;
}

/* ─── Nav (same shape as the librarian) ────────────────────────────────── */

.site-nav {
    position: sticky;
    top: 0;
    z-index: 50;
    display: flex;
    align-items: center;
    gap: 1.25rem;
    padding: 0.65rem clamp(1rem, 3vw, 2rem);
    min-height: var(--nav-h);
    background: var(--surface-2);
    backdrop-filter: saturate(140%) blur(10px);
    -webkit-backdrop-filter: saturate(140%) blur(10px);
    border-bottom: 1px solid var(--rule-soft);
}
.brand {
    display: inline-flex;
    align-items: baseline;
    gap: 0.55rem;
    text-decoration: none;
    font-family: var(--serif);
    font-size: 1.08rem;
    color: var(--ink);
}
.brand-mark {
    color: var(--accent);
    font-size: 1.35rem;
    line-height: 1;
    transform: translateY(2px);
}
.brand:hover .brand-mark {
    color: var(--accent-deep);
}
.site-nav nav {
    display: flex;
    gap: 1.15rem;
    margin-left: auto;
    flex-wrap: wrap;
}
.site-nav nav a {
    font-size: 0.9rem;
    text-decoration: none;
    color: var(--ink-soft);
    padding: 0.25rem 0;
    position: relative;
    transition: color 160ms var(--ease);
}
.site-nav nav a::after {
    content: '';
    position: absolute;
    left: 0;
    right: 0;
    bottom: -3px;
    height: 1px;
    background: var(--accent);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 220ms var(--ease);
}
.site-nav nav a:hover,
.site-nav nav a:focus-visible {
    color: var(--ink);
}
.site-nav nav a:hover::after,
.site-nav nav a:focus-visible::after {
    transform: scaleX(1);
}

#theme-toggle {
    appearance: none;
    background: transparent;
    border: 1px solid var(--rule);
    color: var(--ink-soft);
    width: 2.25rem;
    height: 2.25rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    border-radius: 2px;
    transition:
        color 160ms var(--ease),
        border-color 160ms var(--ease),
        background-color 160ms var(--ease);
}
#theme-toggle:hover {
    color: var(--accent);
    border-color: var(--accent);
    background: var(--accent-glow);
}
#theme-toggle .icon-moon {
    display: none;
}
[data-theme='dark'] #theme-toggle .icon-sun {
    display: none;
}
[data-theme='dark'] #theme-toggle .icon-moon {
    display: inline-block;
}

/* ─── Article ─────────────────────────────────────────────────────────── */

main {
    width: var(--container);
    margin: 0 auto;
    padding: 0 0 4rem;
}

article {
    position: relative;
}

.post-banner {
    margin: 0 calc(-1 * ((100vw - var(--container)) / 2));
    margin-top: 0;
    width: 100vw;
    max-width: 100vw;
    margin-left: calc(50% - 50vw);
    margin-right: calc(50% - 50vw);
    aspect-ratio: 16 / 7;
    overflow: hidden;
    border-bottom: 1px solid var(--rule);
}
.post-banner img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center 30%;
}

.post-head {
    max-width: var(--measure);
    margin: clamp(2.25rem, 6vw, 4rem) auto clamp(1.5rem, 3vw, 2.25rem);
    text-align: center;
    position: relative;
}
.post-folio {
    font-family: var(--mono);
    font-size: 0.7rem;
    letter-spacing: 0.24em;
    text-transform: uppercase;
    color: var(--ink-muted);
    margin: 0 0 1.4rem;
}
.post-folio .folio-num {
    color: var(--accent);
}

.post-head h1 {
    font-size: clamp(1.85rem, 5vw, 3.4rem);
    line-height: 1.08;
    letter-spacing: -0.015em;
    margin: 0 0 1.25rem;
    overflow-wrap: break-word;
    hyphens: auto;
}
.post-head h1::after {
    content: '';
    display: block;
    width: 3rem;
    height: 1px;
    background: var(--accent);
    margin: 1.2rem auto 0;
}

.post-meta {
    font-family: var(--sans);
    font-size: 0.82rem;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    color: var(--ink-muted);
    margin: 0;
    display: inline-flex;
    gap: 0.7rem;
    align-items: baseline;
}

/* ─── Prose ───────────────────────────────────────────────────────────── */

.prose {
    max-width: var(--measure);
    margin: 0 auto;
    font-family: var(--serif);
    font-size: 1.18rem;
    line-height: 1.68;
    color: var(--ink-soft);
}
[data-theme='dark'] .prose {
    color: var(--ink);
}

.prose > p:first-of-type::first-letter {
    font-family: var(--serif);
    font-weight: 500;
    font-size: 4.2em;
    line-height: 0.86;
    float: left;
    margin: 0.05em 0.14em 0 0;
    color: var(--accent-deep);
    padding: 0.05em 0.05em 0 0;
}

.prose h2 {
    font-size: 1.7rem;
    margin: 2.8rem 0 1rem;
    line-height: 1.2;
    color: var(--ink);
}
.prose h2::after {
    content: '';
    display: block;
    width: 1.75rem;
    height: 1px;
    background: var(--accent);
    margin-top: 0.55rem;
}
.prose h3 {
    font-size: 1.3rem;
    margin: 2.2rem 0 0.7rem;
    line-height: 1.25;
    color: var(--ink);
}

.prose a {
    color: var(--ink);
    text-decoration-color: var(--accent);
}
.prose a:hover {
    color: var(--accent-deep);
}

.prose strong {
    color: var(--ink);
    font-weight: 600;
}
.prose em {
    font-style: italic;
}

.prose ul,
.prose ol {
    padding-left: 1.4rem;
    margin: 0 0 1.2em;
}
.prose li {
    margin-bottom: 0.35em;
}
.prose ul li::marker {
    color: var(--accent);
}
.prose ol li::marker {
    color: var(--accent);
    font-family: var(--mono);
    font-size: 0.9em;
}

.prose blockquote {
    margin: 1.8rem 0;
    padding: 0.6rem 0 0.6rem 1.4rem;
    border-left: 2px solid var(--accent);
    font-style: italic;
    color: var(--ink);
}
.prose blockquote p:last-child {
    margin-bottom: 0;
}

.prose hr {
    border: none;
    text-align: center;
    margin: 2.5rem 0;
    position: relative;
}
.prose hr::before {
    content: '§';
    color: var(--accent);
    font-family: var(--serif);
    font-size: 1.2rem;
}

.prose code {
    font-family: var(--mono);
    font-size: 0.86em;
    background: color-mix(in srgb, var(--accent) 14%, transparent);
    padding: 0.08em 0.38em;
    border-radius: 2px;
    color: var(--ink);
    text-wrap-mode: wrap;
}

.prose pre {
    background: var(--surface);
    border: 1px solid var(--rule);
    border-left: 2px solid var(--accent);
    border-radius: 3px;
    padding: 1rem 1.2rem;
    overflow-x: auto;
    font-size: 0.86rem;
    line-height: 1.65;
    box-shadow: var(--shadow-soft);
    margin: 1.4rem 0;
    font-family: var(--mono);
}
.prose pre code {
    background: transparent;
    padding: 0;
    border-radius: 0;
    font-size: inherit;
    color: var(--ink);
}

.prose img {
    margin: 1.8rem auto;
    border-radius: 3px;
    border: 1px solid var(--rule);
    box-shadow: var(--shadow);
}

.prose figure {
    margin: 1.8rem 0;
}
.prose figcaption {
    font-family: var(--sans);
    font-size: 0.85rem;
    text-align: center;
    color: var(--ink-muted);
    margin-top: 0.55rem;
    font-style: italic;
}

.prose table {
    width: 100%;
    border-collapse: collapse;
    margin: 1.8rem 0;
    font-family: var(--sans);
    font-size: 0.95rem;
}
.prose th,
.prose td {
    padding: 0.6rem 0.75rem;
    text-align: left;
    border-bottom: 1px solid var(--rule);
}
.prose th {
    font-family: var(--serif);
    color: var(--ink);
    border-bottom: 2px solid var(--accent);
}

.post-end {
    text-align: center;
    margin: 3rem auto 0;
    color: var(--accent);
    font-size: 1.5rem;
}

/* ─── More posts (the index) ──────────────────────────────────────────── */

.more {
    max-width: var(--container);
    margin: clamp(3.5rem, 8vw, 6rem) auto 0;
    padding-top: clamp(2rem, 4vw, 3rem);
    border-top: 1px solid var(--rule);
}
.more h2 {
    font-size: 1.4rem;
    margin: 0 0 1.8rem;
    font-family: var(--serif);
    color: var(--ink);
}
.more h2::after {
    content: '';
    display: block;
    width: 2.5rem;
    height: 1px;
    background: var(--accent);
    margin-top: 0.5rem;
}

.post-index {
    list-style: none;
    padding: 0;
    margin: 0;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(20rem, 100%), 1fr));
    gap: 1.1rem;
}

.post-card {
    position: relative;
}
.post-card a {
    display: block;
    text-decoration: none;
    color: var(--ink);
    background: var(--surface);
    border: 1px solid var(--rule);
    border-top: 2px solid var(--accent);
    border-radius: 2px;
    padding: 1.3rem 1.3rem 1.2rem;
    height: 100%;
    transition:
        transform 220ms var(--ease),
        box-shadow 220ms var(--ease),
        border-color 220ms var(--ease);
}
.post-card a:hover,
.post-card a:focus-visible {
    transform: translateY(-2px);
    box-shadow: var(--shadow);
    border-color: var(--rule);
    border-top-color: var(--accent-deep);
}

.post-card time {
    display: block;
    font-family: var(--mono);
    font-size: 0.7rem;
    letter-spacing: 0.16em;
    color: var(--ink-muted);
    margin-bottom: 0.55rem;
}
.post-card h3 {
    font-family: var(--serif);
    font-size: 1.18rem;
    line-height: 1.22;
    margin: 0 0 0.55rem;
    letter-spacing: -0.005em;
}
.post-card p {
    font-family: var(--sans);
    font-size: 0.92rem;
    color: var(--ink-soft);
    line-height: 1.55;
    margin: 0 0 0.85rem;
}
.post-card-meta {
    display: inline-block;
    font-family: var(--mono);
    font-size: 0.7rem;
    letter-spacing: 0.14em;
    color: var(--ink-muted);
    text-transform: uppercase;
}

.post-card.is-current a {
    background: color-mix(in srgb, var(--accent) 8%, var(--surface));
    cursor: default;
    pointer-events: none;
}
.post-card.is-current a:hover {
    transform: none;
    box-shadow: none;
}
.post-card.is-current .post-card-meta {
    color: var(--accent-deep);
}

/* ─── Footer ──────────────────────────────────────────────────────────── */

footer {
    width: var(--container);
    margin: clamp(3.5rem, 8vw, 6rem) auto 3rem;
    text-align: center;
    font-size: 0.88rem;
    color: var(--ink-muted);
}
.foot-rule {
    width: 6rem;
    height: 1px;
    background: var(--accent);
    margin: 0 auto 1.5rem;
    position: relative;
}
.foot-rule::before,
.foot-rule::after {
    content: '✦';
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    color: var(--accent);
    font-size: 0.7rem;
}
.foot-rule::before {
    left: -1.2rem;
}
.foot-rule::after {
    right: -1.2rem;
}
footer p {
    margin: 0;
}
footer a {
    color: var(--ink-soft);
}

/* ─── Responsive ──────────────────────────────────────────────────────── */

@media (max-width: 44rem) {
    .site-nav {
        gap: 0.5rem;
        padding: 0.55rem 0.85rem;
    }
    .site-nav nav {
        gap: 0.75rem;
        font-size: 0.82rem;
    }
    .site-nav nav a {
        font-size: 0.82rem;
    }
    .brand-name {
        display: none;
    }

    .post-banner {
        aspect-ratio: 16 / 10;
    }

    .prose {
        font-size: 1.08rem;
        line-height: 1.62;
    }
    .prose > p:first-of-type::first-letter {
        font-size: 3.5em;
    }
    .prose h2 {
        font-size: 1.45rem;
    }
    .prose h3 {
        font-size: 1.18rem;
    }
}

/* ─── Reduced motion ──────────────────────────────────────────────────── */

@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }
    *,
    *::before,
    *::after {
        animation-duration: 0.001ms !important;
        transition-duration: 0.001ms !important;
    }
}