/* ============================================================
   Passport Overland — Site Stylesheet
   Utilitarian route guide. Logbook register, elevated.
   Fonts: IBM Plex Sans (structural) + IBM Plex Mono (data)
   Palette: Paper, ink, earth.
   ============================================================ */

/* --- Fonts --- */
@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Sans:wght@300;400;500;600&family=IBM+Plex+Mono:wght@400;500&display=swap');

/* --- Reset & Base --- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
    --color-paper: #f4f0e8;
    --color-paper-dark: #ebe5d9;
    --color-ink: #2a2520;
    --color-ink-light: #5c554d;
    --color-ink-faint: #8a8279;
    --color-rule: #c8c0b4;
    --color-rule-light: #ddd6cc;
    --color-ochre: #a0764a;
    --color-ochre-dark: #7a5a38;
    --color-white: #ffffff;

    --font-sans: 'IBM Plex Sans', 'Helvetica Neue', Arial, sans-serif;
    --font-mono: 'IBM Plex Mono', 'Courier New', monospace;

    --width-max: 980px;
    --width-narrow: 720px;

    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2.5rem;
    --space-xxl: 4rem;
    --space-xxxl: 6rem;
}

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-sans);
    font-weight: 400;
    line-height: 1.65;
    color: var(--color-ink);
    background: var(--color-paper);
}

/* --- Typography --- */
h1, h2, h3, h4 {
    font-family: var(--font-sans);
    font-weight: 500;
    line-height: 1.2;
    color: var(--color-ink);
}

h1 {
    font-size: 1.6rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

h2 {
    font-size: 1.15rem;
    font-weight: 600;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--color-ink-light);
}

h3 {
    font-size: 1rem;
    font-weight: 500;
}

p {
    max-width: 65ch;
}

a {
    color: var(--color-ochre-dark);
    text-decoration: none;
    border-bottom: 1px solid transparent;
    transition: border-color 0.15s ease;
}

a:hover {
    border-bottom-color: var(--color-ochre);
}

/* --- Layout --- */
.site-container {
    max-width: var(--width-max);
    margin: 0 auto;
    padding: 0 var(--space-xl);
}

/* --- Header --- */
.site-header {
    padding: var(--space-lg) 0 var(--space-md);
}

.site-header .site-container {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: var(--space-lg);
}

.site-logo {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    font-weight: 500;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--color-ink);
    border-bottom: none;
}

.site-logo:hover {
    border-bottom: none;
    color: var(--color-ochre-dark);
}

.site-nav {
    display: flex;
    gap: var(--space-lg);
}

.site-nav a {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-weight: 400;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    color: var(--color-ink-faint);
    border-bottom: none;
}

.site-nav a:hover {
    color: var(--color-ink);
    border-bottom: none;
}

/* --- Site Identification Block --- */
.site-ident {
    padding: var(--space-xxl) 0 var(--space-xxxl);
}

.site-ident h1 {
    margin-bottom: var(--space-sm);
}

.site-ident .site-desc {
    font-size: 0.9rem;
    color: var(--color-ink-light);
    max-width: 50ch;
    line-height: 1.55;
}

/* --- Section Labels --- */
.section-label {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    font-weight: 500;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--color-ink-faint);
    margin-bottom: var(--space-xl);
    padding-bottom: var(--space-sm);
    border-bottom: 1px solid var(--color-rule);
    display: inline-block;
}

/* --- Route Index --- */
.route-index {
    padding: 0 0 var(--space-xxxl);
}

.route-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--space-xxl);
}

.route-entry {
    display: grid;
    grid-template-columns: 1fr 240px;
    gap: var(--space-xl);
    align-items: start;
}

.route-name {
    font-family: var(--font-sans);
    font-size: 1.1rem;
    font-weight: 600;
    letter-spacing: 0.03em;
    color: var(--color-ink);
    margin-bottom: var(--space-sm);
}

.route-name a {
    color: var(--color-ink);
    border-bottom: none;
}

.route-name a:hover {
    color: var(--color-ochre-dark);
}

.route-terrain {
    font-size: 0.875rem;
    color: var(--color-ink-light);
    line-height: 1.6;
    max-width: 60ch;
}

/* --- Route Specification Table --- */
.route-spec {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    line-height: 1.85;
    color: var(--color-ink-faint);
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 0 var(--space-md);
    white-space: nowrap;
    background: var(--color-paper-dark);
    padding: var(--space-md) var(--space-lg);
    border-left: 2px solid var(--color-rule);
}

.route-spec dt {
    color: var(--color-ink-faint);
    font-weight: 400;
}

.route-spec dd {
    color: var(--color-ink-light);
    font-weight: 500;
    text-align: right;
}

/* --- Reference Index --- */
.reference-index {
    padding: 0 0 var(--space-xxxl);
}

.ref-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-lg) var(--space-xl);
}

.ref-item a {
    font-family: var(--font-sans);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-ink);
    border-bottom: none;
    display: block;
    margin-bottom: var(--space-xs);
}

.ref-item a:hover {
    color: var(--color-ochre-dark);
}

.ref-desc {
    font-size: 0.78rem;
    color: var(--color-ink-faint);
    line-height: 1.5;
    display: block;
}

/* --- Status Block --- */
.status-block {
    padding: 0 0 var(--space-xxxl);
}

.status-text {
    font-family: var(--font-mono);
    font-size: 0.78rem;
    color: var(--color-ink-faint);
    line-height: 1.7;
    max-width: 70ch;
}

/* --- Footer --- */
.site-footer {
    border-top: 1px solid var(--color-rule);
    padding: var(--space-lg) 0;
}

.site-footer .site-container {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
}

.footer-copy {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    font-weight: 500;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--color-ink-faint);
}

.footer-nav {
    display: flex;
    gap: var(--space-lg);
}

.footer-nav a {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--color-ink-faint);
    border-bottom: none;
    letter-spacing: 0.02em;
}

.footer-nav a:hover {
    color: var(--color-ink);
}

/* --- Route Detail Page --- */
.route-detail {
    padding: var(--space-xxl) 0 var(--space-xxxl);
}

.route-detail h1 {
    margin-bottom: var(--space-sm);
}

.route-summary {
    font-size: 0.9rem;
    color: var(--color-ink-light);
    line-height: 1.6;
    max-width: 60ch;
    margin-bottom: var(--space-xl);
}

.route-spec-full {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    line-height: 1.85;
    color: var(--color-ink-faint);
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 0 var(--space-lg);
    white-space: nowrap;
    background: var(--color-paper-dark);
    padding: var(--space-lg) var(--space-xl);
    border-left: 2px solid var(--color-rule);
    max-width: 480px;
}

.route-spec-full dt {
    color: var(--color-ink-faint);
    font-weight: 400;
}

.route-spec-full dd {
    color: var(--color-ink-light);
    font-weight: 500;
    text-align: right;
}

/* --- Segments --- */
.route-segments {
    padding: 0 0 var(--space-xxxl);
}

.segment-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-xxl);
}

.segment {
    max-width: 65ch;
}

.segment-marker {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    font-weight: 500;
    letter-spacing: 0.06em;
    color: var(--color-ochre-dark);
    display: block;
    margin-bottom: var(--space-sm);
}

.segment p {
    font-size: 0.875rem;
    color: var(--color-ink-light);
    line-height: 1.65;
    margin-bottom: var(--space-sm);
}

.segment p:last-child {
    margin-bottom: 0;
}

.segment-spec {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    line-height: 1.8;
    color: var(--color-ink-faint);
    margin-top: var(--space-md);
    padding-left: var(--space-md);
    border-left: 1px solid var(--color-rule-light);
}

.segment-spec dt {
    display: inline;
    font-weight: 400;
}

.segment-spec dt::after {
    content: ': ';
}

.segment-spec dd {
    display: inline;
    color: var(--color-ink-light);
    font-weight: 500;
    margin-right: var(--space-md);
}

.segment-spec dd::after {
    content: '\A';
    white-space: pre;
}

/* --- Route Notes (seasonal, network) --- */
.route-notes {
    padding: 0 0 var(--space-xxxl);
}

.route-notes p {
    font-size: 0.875rem;
    color: var(--color-ink-light);
    line-height: 1.65;
    margin-bottom: var(--space-md);
}

.route-notes p:last-child {
    margin-bottom: 0;
}

.network-list {
    list-style: none;
    margin-top: var(--space-md);
}

.network-list li {
    font-size: 0.875rem;
    color: var(--color-ink-light);
    line-height: 1.65;
    padding-left: var(--space-md);
    margin-bottom: var(--space-xs);
}

.network-list li::before {
    content: '—';
    margin-right: var(--space-sm);
    color: var(--color-ink-faint);
}

/* --- Reference Document Page --- */
.ref-doc {
    padding: var(--space-xxl) 0 var(--space-xxxl);
}

.ref-doc h1 {
    font-size: 1.3rem;
    margin-bottom: var(--space-sm);
}

.ref-doc-intro {
    font-size: 0.9rem;
    color: var(--color-ink-light);
    line-height: 1.6;
    max-width: 60ch;
    margin-bottom: var(--space-xl);
}

.ref-section {
    padding: 0 0 var(--space-xxxl);
}

.ref-section-content {
    max-width: 65ch;
}

.ref-section-content p {
    font-size: 0.875rem;
    color: var(--color-ink-light);
    line-height: 1.65;
    margin-bottom: var(--space-md);
}

.ref-section-content p:last-child {
    margin-bottom: 0;
}

.procedure-block {
    margin-bottom: var(--space-xl);
}

.procedure-title {
    font-family: var(--font-mono);
    font-size: 0.78rem;
    font-weight: 500;
    color: var(--color-ink);
    margin-bottom: var(--space-md);
}

.procedure-steps {
    list-style: none;
    counter-reset: step;
}

.procedure-steps li {
    font-size: 0.875rem;
    color: var(--color-ink-light);
    line-height: 1.65;
    margin-bottom: var(--space-sm);
    padding-left: var(--space-xl);
    position: relative;
}

.procedure-steps li::before {
    counter-increment: step;
    content: counter(step);
    font-family: var(--font-mono);
    font-size: 0.7rem;
    font-weight: 500;
    color: var(--color-ink-faint);
    position: absolute;
    left: 0;
    top: 0.15em;
}

/* --- Data Tables (reference docs) --- */
.data-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.78rem;
    margin-bottom: var(--space-xl);
}

.data-table th {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    font-weight: 500;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    color: var(--color-ink-faint);
    text-align: left;
    padding: var(--space-sm) var(--space-md) var(--space-sm) 0;
    border-bottom: 1px solid var(--color-rule);
}

.data-table td {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    color: var(--color-ink-light);
    padding: var(--space-sm) var(--space-md) var(--space-sm) 0;
    border-bottom: 1px solid var(--color-rule-light);
    vertical-align: top;
}

.data-table td:first-child {
    font-weight: 500;
    color: var(--color-ink);
}

.data-table caption {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    font-weight: 500;
    color: var(--color-ink-faint);
    text-align: left;
    caption-side: top;
    margin-bottom: var(--space-sm);
    letter-spacing: 0.04em;
}

.note-block {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    color: var(--color-ink-faint);
    line-height: 1.7;
    background: var(--color-paper-dark);
    padding: var(--space-md) var(--space-lg);
    border-left: 2px solid var(--color-rule);
    max-width: 60ch;
    margin-bottom: var(--space-xl);
}

/* --- Responsive --- */
@media (max-width: 760px) {
    .site-container {
        padding: 0 var(--space-lg);
    }

    .site-header .site-container {
        flex-direction: column;
        gap: var(--space-sm);
    }

    .site-nav {
        gap: var(--space-md);
    }

    .site-ident {
        padding: var(--space-xl) 0 var(--space-xxl);
    }

    .route-list {
        gap: var(--space-xl);
    }

    .route-entry {
        grid-template-columns: 1fr;
        gap: var(--space-md);
    }

    .route-spec {
        border-left: none;
        border-top: 2px solid var(--color-rule);
    }

    .ref-grid {
        grid-template-columns: 1fr;
    }

    .site-footer .site-container {
        flex-direction: column;
        gap: var(--space-md);
    }
}