/* Loop Engineering — Companion Site styles
 *
 * Discipline: typography-led, foundation-volume restraint.
 * Black on white primary, single scholarly-blue accent.
 * Serif body matches the book jacket family (Iowan / Sabon / Caslon fallback).
 */

:root {
    --color-text: #0f172a;
    --color-text-muted: #475569;
    --color-bg: #ffffff;
    --color-bg-alt: #f8fafc;
    --color-border: #e2e8f0;
    --color-accent: #1e4d7b;          /* muted scholarly blue */
    --color-accent-hover: #15375a;

    --font-serif: "Iowan Old Style", "Sabon", "Caslon", "Palatino Linotype", Palatino, "Book Antiqua", Georgia, serif;
    --font-sans: "Segoe UI", -apple-system, BlinkMacSystemFont, "Helvetica Neue", Arial, sans-serif;
    --font-mono: Consolas, "Courier New", monospace;

    --space-xs: 0.5rem;
    --space-sm: 0.75rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;

    --max-width: 64rem;
    --radius: 4px;
}

* {
    box-sizing: border-box;
}

html {
    font-size: 17px;
    -webkit-text-size-adjust: 100%;
}

body {
    margin: 0;
    font-family: var(--font-serif);
    color: var(--color-text);
    background: var(--color-bg);
    line-height: 1.6;
}

a {
    color: var(--color-accent);
    text-decoration: underline;
    text-decoration-thickness: 1px;
    text-underline-offset: 2px;
}

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

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--space-lg);
}

/* Header */
header {
    border-bottom: 1px solid var(--color-border);
    padding: var(--space-lg) 0;
}

.header-brand h1 {
    font-family: var(--font-serif);
    font-weight: 600;
    font-size: 1.75rem;
    margin: 0;
    letter-spacing: -0.01em;
}

.header-brand .subtitle {
    font-family: var(--font-sans);
    font-size: 0.9rem;
    color: var(--color-text-muted);
    margin: var(--space-xs) 0 0;
}

/* Navigation */
.site-nav {
    border-bottom: 1px solid var(--color-border);
    background: var(--color-bg-alt);
}

.site-nav .container {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-lg);
    padding-top: var(--space-sm);
    padding-bottom: var(--space-sm);
}

.site-nav a {
    font-family: var(--font-sans);
    font-size: 0.9rem;
    text-decoration: none;
    color: var(--color-text-muted);
    padding: var(--space-xs) 0;
}

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

/* Main content */
main {
    padding-top: var(--space-2xl);
    padding-bottom: var(--space-2xl);
    min-height: 60vh;
}

.page-intro {
    font-size: 1.1rem;
    line-height: 1.65;
    max-width: 44rem;
}

h2 {
    font-family: var(--font-serif);
    font-weight: 600;
    font-size: 1.5rem;
    margin: var(--space-2xl) 0 var(--space-md);
    letter-spacing: -0.005em;
}

h3 {
    font-family: var(--font-serif);
    font-weight: 600;
    font-size: 1.2rem;
    margin: var(--space-lg) 0 var(--space-sm);
}

p {
    margin: 0 0 var(--space-md);
}

/* Card grid for entry points */
.gallery-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(18rem, 1fr));
    gap: var(--space-lg);
    margin: var(--space-xl) 0;
}

.gallery-card {
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: var(--space-lg);
    background: var(--color-bg);
}

.gallery-card-icon {
    font-size: 1.5rem;
    margin-bottom: var(--space-sm);
}

.gallery-card h3 {
    margin: 0 0 var(--space-sm);
}

.gallery-card p {
    color: var(--color-text-muted);
    font-size: 0.95rem;
    margin-bottom: var(--space-md);
}

.gallery-card-meta {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-xs);
    margin: var(--space-sm) 0;
}

.gallery-card-badge {
    font-family: var(--font-sans);
    font-size: 0.75rem;
    padding: 0.2rem 0.5rem;
    background: var(--color-bg-alt);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    color: var(--color-text-muted);
}

.gallery-card-link {
    font-family: var(--font-sans);
    font-size: 0.9rem;
    font-weight: 500;
    text-decoration: none;
}

/* Chapter resources list */
.chapter-list {
    list-style: none;
    padding: 0;
    margin: var(--space-xl) 0;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(20rem, 1fr));
    gap: var(--space-md);
}

.chapter-list li {
    border-left: 2px solid var(--color-accent);
    padding: var(--space-sm) var(--space-md);
    background: var(--color-bg-alt);
}

.chapter-list .chapter-number {
    font-family: var(--font-sans);
    font-size: 0.8rem;
    color: var(--color-text-muted);
    display: block;
    margin-bottom: var(--space-xs);
}

.chapter-list .chapter-title {
    font-family: var(--font-serif);
    font-weight: 600;
    text-decoration: none;
}

/* Footer */
footer {
    border-top: 1px solid var(--color-border);
    padding: var(--space-lg) 0;
    margin-top: var(--space-2xl);
    font-family: var(--font-sans);
    font-size: 0.85rem;
    color: var(--color-text-muted);
}

footer .container {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    gap: var(--space-md);
}

footer a {
    color: var(--color-text-muted);
    text-decoration: none;
    margin-right: var(--space-md);
}

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

/* Print rules */
@media print {
    .site-nav,
    footer .footer-nav {
        display: none;
    }

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

    .gallery-card {
        break-inside: avoid;
    }
}