/* web/static/css/dev-library-reader.css
 * Reader for /library/dev/:slug. Two columns on wide viewports, single
 * column on narrow. Colours from theme variables only.
 */

.devlib-reader {
    max-width: 1100px;
    margin: 0 auto;
    padding: 20px 28px 80px;
}

.devlib-reader__layout {
    display: grid;
    grid-template-columns: 200px minmax(0, 1fr);
    gap: 36px;
    align-items: start;
}

/* ── TOC sidebar ────────────────────────────────────────────────────────── */

.devlib-reader__toc {
    position: sticky;
    top: 76px; /* clears the CivNode top bar */
    max-height: calc(100vh - 100px);
    overflow: auto;
    padding-right: 8px;
    font-family: var(--font-sans);
    font-size: 0.86em;
    line-height: 1.45;
    border-right: 1px solid var(--border-subtle);
}

.devlib-reader__toc-title {
    font-family: var(--font-sans);
    font-size: 0.72em;
    font-weight: 700;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--text-muted);
    margin-bottom: 10px;
}

.devlib-reader__toc-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.devlib-reader__toc-item {
    margin: 0;
    padding: 3px 0;
}

.devlib-reader__toc-item--l1 { padding-left: 0;    font-weight: 600; }
.devlib-reader__toc-item--l2 { padding-left: 12px; }
.devlib-reader__toc-item--l3 { padding-left: 24px; font-size: 0.94em; }
.devlib-reader__toc-item--l4 { padding-left: 36px; font-size: 0.9em; color: var(--text-muted); }

.devlib-reader__toc-link {
    color: var(--text-secondary);
    text-decoration: none;
    display: block;
    padding: 2px 4px;
    border-radius: 2px;
    transition: color var(--transition), background var(--transition);
}

.devlib-reader__toc-link:hover {
    color: var(--text-primary);
    background: color-mix(in srgb, var(--accent) 6%, transparent);
}

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

.devlib-reader__article {
    font-family: var(--font-serif);
    color: var(--text-primary);
    font-size: 1.02em;
    line-height: 1.72;
    max-width: 720px;
}

.devlib-reader__header {
    margin: 0 0 32px;
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    padding: 28px 32px;
}

.devlib-reader__title {
    font-family: var(--font-serif);
    font-size: 2em;
    font-weight: 500;
    margin: 0 0 8px;
    letter-spacing: -0.01em;
    color: var(--text-primary);
}

.devlib-reader__byline {
    font-family: var(--font-sans);
    color: var(--text-secondary);
    font-size: 0.88em;
    margin: 0;
}

.devlib-reader__author {
    color: var(--text-primary);
    font-weight: 500;
}

.devlib-reader__licence {
    font-family: var(--font-mono);
    font-size: 0.9em;
    color: var(--text-muted);
    letter-spacing: 0.03em;
}

/* ── Body typography ─────────────────────────────────────────────────────── */

.devlib-reader__body p,
.devlib-reader__p {
    margin: 0 0 1.1em;
}

.devlib-reader__h1 {
    font-family: var(--font-serif);
    font-size: 1.6em;
    font-weight: 500;
    margin: 2em 0 0.6em;
    letter-spacing: -0.01em;
    color: var(--text-primary);
    border-bottom: 2px solid color-mix(in srgb, var(--accent) 30%, transparent);
    padding-bottom: 6px;
}

.devlib-reader__h2 {
    font-family: var(--font-serif);
    font-size: 1.35em;
    font-weight: 500;
    margin: 1.8em 0 0.5em;
    color: var(--text-primary);
    letter-spacing: -0.005em;
}

.devlib-reader__h3 {
    font-family: var(--font-serif);
    font-size: 1.15em;
    font-weight: 500;
    margin: 1.4em 0 0.35em;
    color: var(--text-primary);
}

.devlib-reader__h4,
.devlib-reader__h5,
.devlib-reader__h6 {
    font-family: var(--font-sans);
    font-size: 0.95em;
    font-weight: 600;
    margin: 1.2em 0 0.3em;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.06em;
}

.devlib-reader__ul,
.devlib-reader__ol {
    padding-left: 1.4em;
    margin: 0 0 1.1em;
}

.devlib-reader__li {
    margin: 0.3em 0;
}

.devlib-reader__bq {
    margin: 1.2em 0;
    padding: 0.2em 1em 0.2em 1.2em;
    border-left: 3px solid color-mix(in srgb, var(--accent) 40%, transparent);
    color: var(--text-secondary);
    font-style: italic;
}

.devlib-reader__hr {
    margin: 2.4em 0;
    border: none;
    height: 1px;
    background: var(--border-subtle);
}

.devlib-reader__inline-code {
    font-family: var(--font-mono);
    font-size: 0.9em;
    background: color-mix(in srgb, var(--accent) 10%, transparent);
    padding: 1px 5px;
    border-radius: 2px;
}

/* ── Code blocks ─────────────────────────────────────────────────────────── */

.devlib-reader__code {
    margin: 1.2em 0;
    background: color-mix(in srgb, var(--bg-secondary) 70%, var(--bg-elevated) 30%);
    border-left: 3px solid var(--accent);
    border-radius: 0 var(--radius-sm, 4px) var(--radius-sm, 4px) 0;
    overflow: hidden;
}

.devlib-reader__code-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
    padding: 8px 14px;
    background: color-mix(in srgb, var(--bg-elevated) 70%, var(--accent) 8%);
    border-bottom: 1px solid color-mix(in srgb, var(--accent) 22%, var(--border-subtle));
    font-family: var(--font-sans);
    font-size: 0.78rem;
    line-height: 1;
}

.devlib-reader__code-lang {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    font-weight: 500;
    color: var(--text-muted);
    letter-spacing: 0.06em;
    text-transform: uppercase;
    padding: 4px 8px;
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-sm);
    background: color-mix(in srgb, var(--bg-primary) 65%, transparent);
}

.devlib-reader__run {
    font-family: var(--font-sans);
    font-size: 0.78rem;
    font-weight: 500;
    line-height: 1;
    padding: 6px 14px;
    border: 1px solid var(--accent);
    border-radius: var(--radius-sm);
    background: color-mix(in srgb, var(--accent) 18%, var(--bg-elevated));
    color: var(--text-primary);
    cursor: pointer;
    transition: background var(--transition), color var(--transition), border-color var(--transition);
}

.devlib-reader__run:hover {
    background: var(--accent);
    color: var(--text-on-accent);
}

.devlib-reader__pre {
    margin: 0;
    padding: 12px 14px;
    overflow-x: auto;
    font-family: var(--font-mono);
    font-size: 0.88em;
    line-height: 1.5;
    color: var(--text-primary);
}

.devlib-reader__code-inner {
    font-family: inherit;
    white-space: pre;
}

/* ── Attribution footer ──────────────────────────────────────────────────── */

.devlib-reader__attribution {
    margin-top: 48px;
    padding-top: 18px;
    border-top: 1px solid var(--border-subtle);
    font-family: var(--font-sans);
    font-size: 0.86em;
    color: var(--text-secondary);
}

.devlib-reader__attr-title {
    font-family: var(--font-sans);
    font-size: 0.72em;
    font-weight: 700;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--text-muted);
    margin-bottom: 8px;
}

.devlib-reader__attr-body p {
    margin: 0 0 0.5em;
}

.devlib-reader__source {
    margin: 12px 0 0;
    font-size: 0.86em;
    color: var(--text-muted);
}

.devlib-reader__source a {
    color: var(--accent);
    word-break: break-all;
}

.devlib-reader__loading,
.devlib-reader__error {
    font-family: var(--font-sans);
    color: var(--text-muted);
    padding: 48px 32px;
    text-align: center;
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
}

.devlib-reader__error { color: var(--danger); }

/* ── Header top row ──────────────────────────────────────────────────────── */

.devlib-reader__header-top {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 12px;
    flex-wrap: wrap;
}

.devlib-reader__export-btn {
    flex-shrink: 0;
    margin-top: 4px;
    font-family: var(--font-sans);
    font-size: 0.82em;
}

/* ── Margin column ───────────────────────────────────────────────────────── */

.devlib-reader__margin-col {
    /* filled by margin panel */
}

/* ── Chapter wrap ────────────────────────────────────────────────────────── */

.devlib-chapter-wrap {
    /* transparent structural wrapper */
}

/* ── Code block actions row ──────────────────────────────────────────────── */

.devlib-reader__code-actions {
    display: flex;
    gap: 8px;
    align-items: center;
    flex-wrap: nowrap;
    margin-left: auto;
}

.devlib-reader__code-btn {
    font-family: var(--font-sans);
    font-size: 0.78rem;
    font-weight: 500;
    line-height: 1;
    padding: 6px 12px;
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-sm);
    background: color-mix(in srgb, var(--bg-primary) 50%, transparent);
    color: var(--text-secondary);
    cursor: pointer;
    transition: background var(--transition), color var(--transition), border-color var(--transition);
    white-space: nowrap;
}

.devlib-reader__code-btn:hover {
    background: color-mix(in srgb, var(--accent) 18%, var(--bg-elevated));
    color: var(--text-primary);
    border-color: color-mix(in srgb, var(--accent) 60%, var(--border));
}

.devlib-reader__code-btn:active {
    transform: translateY(1px);
}

.devlib-reader__code-btn:disabled {
    opacity: 0.5;
    cursor: default;
    transform: none;
}

@media (max-width: 720px) {
    .devlib-reader__code-actions {
        gap: 6px;
    }
    .devlib-reader__code-btn,
    .devlib-reader__run {
        padding: 5px 9px;
        font-size: 0.74rem;
    }
}

/* ── Cross-book screens (todos / snippets) ────────────────────────────────── */

.devlib-xbook {
    max-width: 820px;
    margin: 0 auto;
    padding: 24px 28px 80px;
}

.devlib-xbook__header {
    margin-bottom: 28px;
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    padding: 28px 32px;
}

.devlib-xbook__title {
    font-family: var(--font-serif);
    font-size: 1.8em;
    font-weight: 500;
    margin: 0 0 8px;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 10px;
}

.devlib-xbook__title .civ-icon { filter: var(--icon-filter); }

.devlib-xbook__sub {
    font-family: var(--font-sans);
    color: var(--text-secondary);
    font-size: 0.9em;
    margin: 0;
}

.devlib-xbook__content {
    display: flex;
    flex-direction: column;
    gap: 28px;
}

.devlib-xbook__group {
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    padding: var(--gap-lg, 1.5rem);
}

.devlib-xbook__group-header {
    margin-bottom: 10px;
}

.devlib-xbook__group-title {
    font-family: var(--font-sans);
    font-size: 0.82em;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--text-muted);
    margin: 0;
}

.devlib-xbook__book-link {
    color: var(--accent);
    text-decoration: none;
}

.devlib-xbook__book-link:hover { text-decoration: underline; }

.devlib-xbook__list {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.devlib-xbook__item {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 10px 14px;
    transition: border-color var(--transition);
}

.devlib-xbook__item:hover { border-color: var(--accent-subtle); background: color-mix(in srgb, var(--bg-elevated) 90%, var(--accent) 10%); }

.devlib-xbook__item--done {
    opacity: 0.55;
}

.devlib-xbook__check {
    accent-color: var(--accent);
    flex-shrink: 0;
    margin-top: 2px;
}

.devlib-xbook__item-body {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.devlib-xbook__note-text {
    font-family: var(--font-sans);
    font-size: 0.92em;
    color: var(--text-primary);
}

.devlib-xbook__selection {
    font-style: italic;
    color: var(--text-secondary);
    font-size: 0.85em;
    border-left: 2px solid color-mix(in srgb, var(--accent) 40%, transparent);
    padding-left: 8px;
    margin: 0;
}

.devlib-xbook__item-meta {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: 4px;
    flex-shrink: 0;
    font-family: var(--font-sans);
    font-size: 0.8em;
}

.devlib-xbook__date { color: var(--text-muted); }

.devlib-xbook__jump {
    color: var(--accent);
    font-size: 0.85em;
    text-decoration: none;
    white-space: nowrap;
}

.devlib-xbook__jump:hover { text-decoration: underline; }

/* Snippets specific */
.devlib-xbook__item--snippet {
    flex-direction: column;
    align-items: stretch;
}

.devlib-xbook__snippet-code {
    background: color-mix(in srgb, var(--bg-primary) 60%, var(--bg-elevated) 40%);
    border-radius: var(--radius-sm);
    overflow: hidden;
    border-left: 3px solid var(--accent);
    margin-bottom: 8px;
}

.devlib-xbook__snippet-pre {
    font-family: var(--font-mono);
    font-size: 0.85em;
    line-height: 1.5;
    color: var(--text-primary);
    padding: 10px 14px;
    margin: 0;
    overflow-x: auto;
    white-space: pre;
    max-height: 200px;
}

.devlib-xbook__snippet-footer {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
}

.devlib-xbook__tag-row {
    display: flex;
    gap: 4px;
    flex-wrap: wrap;
}

.devlib-xbook__tag {
    font-size: 0.78em;
    background: color-mix(in srgb, var(--accent) 8%, var(--bg-surface));
    color: var(--text-muted);
    border-radius: var(--radius-sm);
    padding: 1px 5px;
}

.devlib-xbook__open-btn {
    margin-left: auto;
}

.devlib-xbook__empty,
.devlib-xbook__loading {
    font-family: var(--font-sans);
    color: var(--text-muted);
    text-align: center;
    padding: 48px 32px;
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
}

.devlib-xbook__error {
    font-family: var(--font-sans);
    color: var(--danger);
    padding: 24px 32px;
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
}

/* sandbox-panel context label */
.sandbox-panel__context {
    font-size: 0.8em;
    color: var(--text-muted);
    font-weight: 400;
    font-family: var(--font-sans);
}

/* ── Phase 2: teaser affordances ─────────────────────────────────────────── */

/* Row of teaser buttons/links below the book byline and at the sample footer. */
.devlib-reader__teaser-row {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 10px;
    margin-top: 14px;
}

/* Primary CTA: "Buy on Amazon" — uses .btn + .btn-primary from components.css,
   with a slight size reduction to sit alongside body text comfortably. */
.devlib-reader__teaser-btn {
    font-size: 0.85rem;
    padding: 0.45em 1em;
    gap: 6px;
}

/* Text links for Source / Companion program. */
.devlib-reader__teaser-link {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    font-family: var(--font-sans);
    font-size: 0.85rem;
    color: var(--accent);
    background: none;
    border: none;
    padding: 0;
    cursor: pointer;
    text-decoration: none;
    transition: color var(--transition);
}

.devlib-reader__teaser-link:hover {
    color: var(--accent-hover);
    text-decoration: underline;
}

.devlib-reader__teaser-link .civ-icon {
    filter: var(--icon-filter);
    opacity: 0.75;
    flex-shrink: 0;
}

/* "Sample chapter" chip shown inline with the byline. */
.devlib-reader__sample-chip {
    display: inline-block;
    margin-top: 10px;
    padding: 2px 9px;
    font-family: var(--font-sans);
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    background: color-mix(in srgb, var(--accent) 15%, transparent);
    color: var(--accent);
    border: 1px solid color-mix(in srgb, var(--accent) 30%, transparent);
    border-radius: var(--radius-sm);
}

/* Footer card shown at the end of a sample chapter. */
.devlib-reader__sample-footer {
    margin-top: 40px;
    padding: 20px 24px;
    background: var(--bg-surface);
    border: 1px solid color-mix(in srgb, var(--accent) 20%, var(--border));
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
}

.devlib-reader__sample-heading {
    font-family: var(--font-sans);
    font-size: 0.95rem;
    color: var(--text-primary);
    margin-bottom: 6px;
    line-height: 1.5;
}

.devlib-reader__sample-sub {
    font-family: var(--font-sans);
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 0;
}

/* ── Narrow screens ──────────────────────────────────────────────────────── */

@media (max-width: 900px) {
    .devlib-reader__layout {
        grid-template-columns: 1fr;
    }
    .devlib-reader__toc {
        position: static;
        max-height: none;
        border-right: none;
        border-bottom: 1px solid var(--border-subtle);
        padding: 0 0 16px;
        margin-bottom: 18px;
    }
}