/* The Geometry of Trust — shared site styles
   Aesthetic continuous with the standalone primer:
   Prussian blueprint palette, Barlow Condensed display, Barlow body. */

:root {
    --prussian:        #003153;
    --prussian-deep:   #001f3d;
    --prussian-mid:    #1a4a6e;
    --prussian-light:  #2d6a8f;
    --blueprint-line:       rgba(120, 180, 220, 0.18);
    --blueprint-line-minor: rgba(120, 180, 220, 0.07);
    --warm-white:      #faf8f5;
    --text-dark:       #1a1a1a;
    --text-mid:        #4a4a4a;
    --text-light:      #888;
    --card-border:     rgba(0, 49, 83, 0.10);
    --dimension-border: rgba(0, 49, 83, 0.25);
}

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

body {
    font-family: 'Barlow', -apple-system, BlinkMacSystemFont, sans-serif;
    background-color: var(--warm-white);
    color: var(--text-dark);
    line-height: 1.65;
    position: relative;
    min-height: 100vh;
    font-size: 19px;
}

body::before {
    content: '';
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background-image:
        linear-gradient(var(--blueprint-line-minor) 1px, transparent 1px),
        linear-gradient(90deg, var(--blueprint-line-minor) 1px, transparent 1px),
        linear-gradient(var(--blueprint-line) 1px, transparent 1px),
        linear-gradient(90deg, var(--blueprint-line) 1px, transparent 1px);
    background-size: 20px 20px, 20px 20px, 100px 100px, 100px 100px;
    pointer-events: none;
    z-index: 0;
}

.container {
    position: relative;
    z-index: 1;
    max-width: 780px;
    margin: 0 auto;
    padding: 48px 40px 80px;
}

/* Top navigation */
.site-nav {
    position: relative;
    z-index: 2;
    max-width: 780px;
    margin: 0 auto;
    padding: 24px 40px 0;
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    flex-wrap: wrap;
    gap: 16px;
}

.site-nav-brand a {
    font-family: 'Barlow Condensed', sans-serif;
    font-size: 16px;
    font-weight: 700;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    color: var(--prussian-deep);
    text-decoration: none;
}

.site-nav-links {
    display: flex;
    gap: 24px;
    flex-wrap: wrap;
}

.site-nav-links a {
    font-family: 'Barlow Condensed', sans-serif;
    font-size: 14px;
    font-weight: 500;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    color: var(--prussian-mid);
    text-decoration: none;
    padding-bottom: 2px;
    border-bottom: 1px solid transparent;
    transition: border-color 0.15s ease, color 0.15s ease;
}

.site-nav-links a:hover,
.site-nav-links a[aria-current="page"] {
    color: var(--prussian-deep);
    border-bottom-color: var(--prussian-light);
}

/* Header */
.page-header {
    text-align: center;
    margin-bottom: 56px;
    padding-bottom: 40px;
    border-bottom: 1px solid var(--dimension-border);
}

.header-eyebrow {
    font-family: 'Barlow Condensed', sans-serif;
    font-size: 19px;
    font-weight: 600;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--prussian-light);
    margin-bottom: 16px;
}

.page-header h1 {
    font-family: 'Barlow Condensed', sans-serif;
    font-size: 43px;
    font-weight: 300;
    letter-spacing: 0.04em;
    color: var(--prussian-deep);
    line-height: 1.1;
    margin-bottom: 12px;
}

.page-header h1 span {
    font-weight: 700;
}

.header-sub {
    font-family: 'Barlow Condensed', sans-serif;
    font-size: 17px;
    font-weight: 400;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--text-light);
    margin-bottom: 24px;
}

.header-lede {
    font-size: 19px;
    font-weight: 400;
    color: var(--text-mid);
    max-width: 620px;
    margin: 0 auto;
    line-height: 1.7;
    text-align: left;
}

.header-lede strong {
    color: var(--text-dark);
    font-weight: 600;
}

/* Section titles */
.section-title {
    font-family: 'Barlow Condensed', sans-serif;
    font-size: 19px;
    font-weight: 700;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--prussian);
    margin-bottom: 20px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--dimension-border);
}

.section {
    margin-bottom: 48px;
}

.section p {
    margin-bottom: 18px;
    color: var(--text-mid);
}

.section p.lede {
    color: var(--text-dark);
    font-size: 19px;
}

.section a {
    color: var(--prussian-mid);
    text-decoration: underline;
    text-decoration-color: rgba(45, 106, 143, 0.35);
    text-underline-offset: 3px;
}

.section a:hover {
    color: var(--prussian-deep);
    text-decoration-color: var(--prussian-light);
}

/* Index cards — home page */
.index-cards {
    display: grid;
    grid-template-columns: 1fr;
    gap: 16px;
    margin-bottom: 48px;
}

.index-card {
    display: block;
    background: white;
    border: 1px solid var(--card-border);
    padding: 24px 28px;
    text-decoration: none;
    color: inherit;
    transition: border-color 0.15s ease, transform 0.15s ease;
}

.index-card:hover {
    border-color: var(--prussian-light);
    transform: translateY(-1px);
}

.index-card-label {
    font-family: 'Barlow Condensed', sans-serif;
    font-size: 13px;
    font-weight: 700;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--prussian-light);
    margin-bottom: 8px;
}

.index-card-title {
    font-family: 'Barlow Condensed', sans-serif;
    font-size: 24px;
    font-weight: 500;
    color: var(--prussian-deep);
    margin-bottom: 8px;
    letter-spacing: 0.01em;
}

.index-card-body {
    font-size: 17px;
    color: var(--text-mid);
    line-height: 1.6;
}

/* Dimension blocks — theory page */
.dimension {
    background: white;
    border: 1px solid var(--card-border);
    border-left: 3px solid var(--prussian-light);
    padding: 22px 26px;
    margin-bottom: 16px;
}

.dimension-header {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    margin-bottom: 12px;
    flex-wrap: wrap;
    gap: 8px;
}

.dimension-name {
    font-family: 'Barlow Condensed', sans-serif;
    font-size: 22px;
    font-weight: 600;
    color: var(--prussian-deep);
    letter-spacing: 0.02em;
}

.dimension-tag {
    font-family: 'Barlow Condensed', sans-serif;
    font-size: 14px;
    color: var(--text-light);
    font-weight: 400;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.dimension-body {
    font-size: 17px;
    color: var(--text-mid);
    line-height: 1.7;
}

/* Callouts */
.callout {
    background: white;
    border: 1px solid var(--card-border);
    padding: 22px 26px;
    margin: 28px 0;
}

.callout-label {
    font-family: 'Barlow Condensed', sans-serif;
    font-size: 13px;
    font-weight: 700;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--prussian);
    margin-bottom: 10px;
}

.callout-body {
    font-size: 17px;
    color: var(--text-mid);
    line-height: 1.65;
}

.callout-body em {
    font-style: italic;
    color: var(--prussian);
}

/* Footer */
.site-footer {
    max-width: 780px;
    margin: 0 auto;
    padding: 40px;
    border-top: 1px solid var(--dimension-border);
    font-family: 'Barlow Condensed', sans-serif;
    font-size: 14px;
    letter-spacing: 0.08em;
    color: var(--text-light);
    text-align: center;
    position: relative;
    z-index: 1;
}

.site-footer a {
    color: var(--prussian-mid);
    text-decoration: none;
    border-bottom: 1px solid rgba(45, 106, 143, 0.3);
}

.site-footer a:hover {
    color: var(--prussian-deep);
    border-bottom-color: var(--prussian-light);
}

.site-footer .footer-row {
    margin-bottom: 8px;
}

/* Responsive */
@media (max-width: 640px) {
    .container { padding: 32px 24px 64px; }
    .site-nav { padding: 20px 24px 0; gap: 12px; }
    .page-header h1 { font-size: 34px; }
    .site-nav-links { gap: 18px; }
    .site-nav-links a { font-size: 13px; }
}