:root {
    --bg: #faf7f0;
    --bg-alt: #f0ead9;
    --ink: #24211c;
    --ink-soft: #55503f;
    --accent: #8a3324;
    --accent-soft: #b9553f;
    --line: #ddd3ba;
    --card-bg: #ffffff;
    --shadow: 0 6px 18px rgba(36, 33, 28, 0.12);
    --serif: 'Georgia', 'Iowan Old Style', 'Palatino Linotype', serif;
    --sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) {
        --bg: #1b1815;
        --bg-alt: #262220;
        --ink: #ede7da;
        --ink-soft: #b9b1a0;
        --accent: #e08a6f;
        --accent-soft: #cf6b4f;
        --line: #3a352e;
        --card-bg: #221f1b;
        --shadow: 0 6px 20px rgba(0, 0, 0, 0.45);
    }
}

:root[data-theme="dark"] {
    --bg: #1b1815;
    --bg-alt: #262220;
    --ink: #ede7da;
    --ink-soft: #b9b1a0;
    --accent: #e08a6f;
    --accent-soft: #cf6b4f;
    --line: #3a352e;
    --card-bg: #221f1b;
    --shadow: 0 6px 20px rgba(0, 0, 0, 0.45);
}

* { box-sizing: border-box; }

body {
    background: var(--bg);
    color: var(--ink);
    font-family: var(--sans);
    line-height: 1.55;
    padding: 0 20px;
}

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

.wrap {
    max-width: 1100px;
    margin: 0 auto;
}

header.site {
    padding: 36px 0 20px;
    border-bottom: 1px solid var(--line);
    margin-bottom: 32px;
}

header.site .header-row {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 12px;
}

header.site .brand {
    font-family: var(--serif);
    font-size: 2rem;
    letter-spacing: 0.02em;
    color: var(--ink);
}

nav.site-nav {
    display: flex;
    gap: 22px;
    font-size: 0.95rem;
}

nav.site-nav a {
    color: var(--ink-soft);
}

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

header.site .tagline {
    color: var(--ink-soft);
    margin-top: 6px;
    font-size: 0.95rem;
}

nav.crumb {
    font-size: 0.85rem;
    color: var(--ink-soft);
    margin-bottom: 18px;
}

footer.site {
    border-top: 1px solid var(--line);
    margin-top: 60px;
    padding: 24px 0 48px;
    color: var(--ink-soft);
    font-size: 0.85rem;
}

section.series-block {
    margin-bottom: 56px;
}

.series-head {
    margin-bottom: 18px;
}

.series-head h1,
.series-head h2 {
    font-family: var(--serif);
    font-size: 1.6rem;
    margin: 0 0 8px;
}

.series-head h2 a { color: var(--ink); }
.series-head h2 a:hover { color: var(--accent); }

.series-blurb {
    color: var(--ink-soft);
    max-width: 760px;
    font-size: 0.98rem;
}

.book-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
    gap: 22px;
}

.book-card {
    background: var(--card-bg);
    border-radius: 10px;
    box-shadow: var(--shadow);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    transition: transform 0.15s ease;
}

.book-card:hover { transform: translateY(-3px); }

.book-card a.cover-link {
    display: block;
    background: var(--bg-alt);
}

.book-card img.cover {
    width: 100%;
    display: block;
    aspect-ratio: 2 / 3;
    object-fit: cover;
}

.book-card .card-body {
    padding: 10px 12px 14px;
}

.book-card .card-body h3 {
    font-family: var(--serif);
    font-size: 1rem;
    margin: 0 0 4px;
    line-height: 1.3;
}

.book-card .card-body h3 a { color: var(--ink); }

.book-card .card-body .num {
    color: var(--ink-soft);
    font-size: 0.78rem;
}

.book-hero {
    display: flex;
    gap: 36px;
    flex-wrap: wrap;
    margin-bottom: 40px;
}

.book-hero .cover-wrap {
    flex: 0 0 260px;
    max-width: 100%;
}

.book-hero .cover-wrap img {
    width: 100%;
    border-radius: 10px;
    box-shadow: var(--shadow);
    display: block;
}

.book-hero .details {
    flex: 1 1 420px;
    min-width: 0;
}

.book-hero h1 {
    font-family: var(--serif);
    font-size: 2.2rem;
    margin: 0 0 6px;
}

.book-hero .subtitle {
    font-size: 1.15rem;
    color: var(--accent);
    font-style: italic;
    margin: 0 0 14px;
}

.book-hero .series-tag {
    display: inline-block;
    background: var(--bg-alt);
    color: var(--ink-soft);
    border-radius: 999px;
    padding: 4px 12px;
    font-size: 0.82rem;
    margin-bottom: 18px;
}

.blurb p {
    margin: 0 0 1em;
    max-width: 640px;
}

.series-nav {
    margin-top: 26px;
    border-top: 1px solid var(--line);
    padding-top: 18px;
    display: flex;
    justify-content: space-between;
    gap: 16px;
    flex-wrap: wrap;
    font-size: 0.92rem;
}

.author-note {
    font-family: var(--serif);
    font-style: italic;
    color: var(--ink-soft);
    max-width: 640px;
}

.pill-row {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    margin: 18px 0;
}

.pill-row a {
    background: var(--bg-alt);
    border-radius: 999px;
    padding: 6px 14px;
    font-size: 0.85rem;
    color: var(--ink);
}

.pill-row a:hover { color: var(--accent); text-decoration: none; }

.pill-row a.active {
    background: var(--accent);
    color: #fff;
}

/* Software pages */

.app-grid {
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
}

.app-card .cover-link {
    padding: 24px;
    display: flex;
    justify-content: center;
}

.app-icon {
    width: 96px;
    height: 96px;
    aspect-ratio: 1 / 1;
    border-radius: 18px;
    object-fit: cover;
}

.app-tagline {
    color: var(--ink-soft);
    font-size: 0.88rem;
    margin: 0;
}

.app-hero .cover-wrap {
    flex: 0 0 140px;
}

.app-hero .cover-wrap img {
    border-radius: 18px;
}

.app-hero-image {
    margin-bottom: 32px;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow);
}

.app-hero-image img {
    width: 100%;
    display: block;
}

.store-button {
    display: inline-block;
    background: var(--accent);
    color: #fff;
    padding: 10px 20px;
    border-radius: 8px;
    font-size: 0.95rem;
    margin-top: 6px;
}

.store-button:hover {
    background: var(--accent-soft);
    color: #fff;
    text-decoration: none;
}

.app-cta {
    margin-top: 36px;
}

.section-heading {
    font-family: var(--serif);
    font-size: 1.4rem;
    margin: 40px 0 18px;
    border-top: 1px solid var(--line);
    padding-top: 28px;
}

.shot-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 22px;
}

.shot-card {
    margin: 0;
    background: var(--card-bg);
    border-radius: 10px;
    box-shadow: var(--shadow);
    overflow: hidden;
}

.shot-card img {
    width: 100%;
    display: block;
}

.shot-card figcaption {
    padding: 10px 14px 14px;
    font-size: 0.85rem;
    color: var(--ink-soft);
}

/* GitHub page */

.repo-tile .cover-link {
    padding: 0;
}

.repo-social-image {
    aspect-ratio: 1200 / 600;
    object-fit: cover;
}

.repo-meta {
    margin-top: 8px;
    display: flex;
    gap: 12px;
    font-size: 0.78rem;
    color: var(--ink-soft);
}

/* README rendering */

.readme-content {
    max-width: 760px;
    margin: 8px 0 40px;
    line-height: 1.6;
}

.readme-content h1,
.readme-content h2,
.readme-content h3,
.readme-content h4 {
    font-family: var(--serif);
    margin: 1.4em 0 0.5em;
}

.readme-content h1 { font-size: 1.6rem; }
.readme-content h2 { font-size: 1.35rem; }
.readme-content h3 { font-size: 1.15rem; }
.readme-content h4 { font-size: 1rem; }

.readme-content p {
    margin: 0 0 1em;
}

.readme-content ul,
.readme-content ol {
    margin: 0 0 1em;
    padding-left: 1.4em;
}

.readme-content li {
    margin-bottom: 0.3em;
}

.readme-content code {
    background: var(--bg-alt);
    border-radius: 4px;
    padding: 0.15em 0.4em;
    font-size: 0.88em;
    font-family: 'Consolas', 'Menlo', monospace;
}

.readme-content pre {
    background: var(--bg-alt);
    border-radius: 8px;
    padding: 14px 16px;
    overflow-x: auto;
    margin: 0 0 1.2em;
}

.readme-content pre code {
    background: none;
    padding: 0;
    font-size: 0.85em;
}

.readme-content blockquote {
    border-left: 3px solid var(--line);
    margin: 0 0 1.2em;
    padding: 2px 0 2px 16px;
    color: var(--ink-soft);
}

.readme-content img {
    max-width: 100%;
    border-radius: 6px;
}

.readme-content hr {
    border: none;
    border-top: 1px solid var(--line);
    margin: 2em 0;
}

.readme-content table {
    border-collapse: collapse;
    margin: 0 0 1.2em;
    max-width: 100%;
    display: block;
    overflow-x: auto;
}

.readme-content th,
.readme-content td {
    border: 1px solid var(--line);
    padding: 6px 12px;
    text-align: left;
    font-size: 0.9rem;
}

.readme-content th {
    background: var(--bg-alt);
}

.pill {
    background: var(--bg-alt);
    border-radius: 999px;
    padding: 2px 10px;
    font-size: 0.7rem;
}

/* Buy buttons */

.buy-row {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    margin: 16px 0 22px;
}

.store-button-alt {
    background: var(--ink);
}

.store-button-alt:hover {
    background: var(--ink-soft);
}

.coming-soon-pill {
    background: var(--bg-alt);
    color: var(--ink-soft);
    font-size: 0.82rem;
    padding: 6px 14px;
}

.sample-button {
    display: inline-block;
    background: var(--card-bg);
    color: var(--ink);
    padding: 10px 20px;
    border-radius: 8px;
    font-size: 0.95rem;
    margin-top: 6px;
    border: 1px solid var(--line);
    box-shadow: var(--shadow);
}

.sample-button:hover {
    background: var(--bg-alt);
    color: var(--ink);
    text-decoration: none;
}

/* Online sample reader */

.reader-note {
    color: var(--ink-soft);
    margin-top: -8px;
    margin-bottom: 22px;
}

.reader {
    border: 1px solid var(--line);
    border-radius: 10px;
    background: var(--card-bg);
    box-shadow: var(--shadow);
    overflow: hidden;
    margin-bottom: 40px;
}

.reader-toolbar {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
    padding: 10px 14px;
    background: var(--bg-alt);
    border-bottom: 1px solid var(--line);
}

.reader-toolbar-gap {
    flex: 1 1 auto;
}

.reader-toolbar button,
.reader-toolbar select {
    font-family: var(--sans);
    font-size: 0.85rem;
    color: var(--ink);
    background: var(--card-bg);
    border: 1px solid var(--line);
    border-radius: 6px;
    padding: 6px 10px;
    cursor: pointer;
}

.reader-toolbar button:hover {
    background: var(--bg);
}

.reader-toolbar select {
    max-width: 40%;
    flex: 1 1 220px;
}

.reader-viewer {
    position: relative;
    height: 72vh;
    min-height: 380px;
    max-height: 820px;
    overflow: auto;
    padding: 28px clamp(16px, 6%, 64px);
}

.reader-loading {
    color: var(--ink-soft);
    text-align: center;
    margin-top: 40px;
}

@media (max-width: 600px) {
    .reader-viewer {
        height: 65vh;
        padding: 18px 16px;
    }

    .reader-toolbar select {
        max-width: 100%;
        flex-basis: 100%;
        order: 3;
    }
}

.sample-warning {
    background: #fff4d6;
    color: #4a3a05;
    border: 1px solid #e8c766;
    border-left: 6px solid #c99a1e;
    border-radius: 8px;
    padding: 14px 18px;
    margin: 4px 0 22px;
    font-size: 1rem;
    line-height: 1.5;
    max-width: 640px;
}

.sample-warning strong {
    color: #7a3b00;
}

@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) .sample-warning {
        background: #3a2f0f;
        color: #f0dfa8;
        border-color: #7a611f;
        border-left-color: #e0b23c;
    }

    :root:not([data-theme="light"]) .sample-warning strong {
        color: #ffcf6b;
    }
}

:root[data-theme="dark"] .sample-warning {
    background: #3a2f0f;
    color: #f0dfa8;
    border-color: #7a611f;
    border-left-color: #e0b23c;
}

:root[data-theme="dark"] .sample-warning strong {
    color: #ffcf6b;
}

.card-coming-soon {
    position: absolute;
    top: 8px;
    right: 8px;
    background: rgba(0, 0, 0, 0.72);
    color: #fff;
    font-size: 0.68rem;
    padding: 3px 9px;
    border-radius: 999px;
    max-width: calc(100% - 16px);
    text-align: center;
}

.book-card .cover-link {
    position: relative;
}

/* Contact page */

.page-title {
    font-family: var(--serif);
    font-size: 2rem;
    margin: 0 0 10px;
}

.contact-form {
    max-width: 520px;
    margin-top: 24px;
    display: flex;
    flex-direction: column;
    gap: 18px;
}

.contact-form .field {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.contact-form label {
    font-size: 0.88rem;
    color: var(--ink-soft);
}

.contact-form input[type="text"],
.contact-form input[type="email"],
.contact-form textarea {
    font: inherit;
    color: var(--ink);
    background: var(--card-bg);
    border: 1px solid var(--line);
    border-radius: 8px;
    padding: 10px 12px;
    width: 100%;
}

.contact-form input:focus,
.contact-form textarea:focus {
    outline: 2px solid var(--accent-soft);
    outline-offset: 1px;
}

.contact-form textarea {
    resize: vertical;
}

.contact-form button {
    align-self: flex-start;
    border: none;
    cursor: pointer;
    font: inherit;
}

.hp-field {
    position: absolute;
    left: -9999px;
    width: 1px;
    height: 1px;
    overflow: hidden;
}

.form-success {
    background: var(--bg-alt);
    border-radius: 8px;
    padding: 14px 18px;
    max-width: 520px;
}

.form-errors {
    background: var(--bg-alt);
    border: 1px solid var(--accent);
    border-radius: 8px;
    padding: 12px 18px 12px 34px;
    max-width: 520px;
    color: var(--accent);
    font-size: 0.9rem;
}

.contact-form .field small {
    color: var(--ink-soft);
    font-size: 0.82rem;
}

.form-preview {
    max-width: 520px;
    margin: 16px 0;
    padding: 12px 16px;
    background: var(--card-bg);
    border: 1px solid var(--line);
    border-radius: 8px;
    overflow-wrap: anywhere;
}

.home-title {
    font-family: var(--serif);
    font-size: 1.9rem;
    margin: 0 0 6px;
}

.book-facts {
    display: grid;
    grid-template-columns: max-content 1fr;
    gap: 4px 14px;
    margin: 0 0 20px;
    font-size: 0.9rem;
    color: var(--ink-soft);
    max-width: 640px;
}

.book-facts dt {
    font-weight: 600;
}

.book-facts dd {
    margin: 0;
}

.blurb-heading {
    font-family: var(--serif);
    font-size: 1.25rem;
    margin: 0 0 10px;
}