/* Naustet Capital — visual chassis (issue #23, Stage B).
 *
 * One design system for the whole site: warm paper, near-black ink, one navy accent, hairline rules.
 * The type has three registers (docs/plans/issue-23-chassis-spec.md §3):
 *   Voice      — serif: wordmark, display headlines, standfirsts, pull quotes
 *   Body       — sans: running text, UI labels, navigation
 *   Instruments — mono: dates, numbers, kickers, tags, source lines, folios
 * Every value is a system font stack. Nothing external is loaded; test/css.test.js enforces that.
 */

:root {
    /* Colour (issue #23 spec §2; Kent kept the existing navy accent). */
    --paper: #FAF9F5;
    --ink: #1A1F23;
    --accent: #1e3a5f;
    --muted: #5B564E;
    --rule: #E4E0D6;
    --panel: #F2EFE8;
    --up: #2E6B62;
    --down: #A64B24;

    /* Three registers: system stacks only, no downloaded font. */
    --font-serif: ui-serif, Georgia, Cambria, "Times New Roman", serif;
    --font-sans: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --font-mono: ui-monospace, "SF Mono", "Cascadia Code", Menlo, Consolas, monospace;

    /* 8px spacing scale. */
    --space-1: 4px;
    --space-2: 8px;
    --space-3: 16px;
    --space-4: 24px;
    --space-5: 32px;
    --space-6: 48px;
    --space-7: 64px;
    --space-8: 96px;

    /* Wide editorial container; the reading measure is narrower (see .article-body). */
    --container: 1280px;
    --measure: 42rem;
}

*,
*::before,
*::after {
    box-sizing: border-box;
}

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

body {
    margin: 0;
    background-color: var(--paper);
    color: var(--ink);
    font-family: var(--font-sans);
    font-size: 1.0625rem;
    line-height: 1.7;
    /* "font-variant-numeric: tabular-nums everywhere" (spec §3). */
    font-variant-numeric: tabular-nums;
    text-rendering: optimizeLegibility;
}

::selection {
    background-color: var(--accent);
    color: var(--paper);
}

img {
    max-width: 100%;
    height: auto;
}

a {
    color: var(--accent);
    text-decoration: underline;
    text-decoration-thickness: 1px;
    text-underline-offset: 0.18em;
}

a:hover,
a:focus-visible {
    text-decoration-thickness: 2px;
}

:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 3px;
}

h1,
h2,
h3 {
    color: var(--ink);
    font-family: var(--font-serif);
    text-wrap: balance;
}

h1 {
    margin: 0;
    font-family: var(--font-serif);
    font-size: clamp(2.25rem, 5vw, 3.5rem);
    font-weight: 700;
    line-height: 1.08;
    letter-spacing: -0.02em;
}

h2 {
    margin: 0 0 var(--space-2);
    font-family: var(--font-serif);
    font-size: 1.6rem;
    font-weight: 600;
    line-height: 1.2;
}

h3 {
    margin: 0 0 var(--space-2);
    font-size: 1.25rem;
    font-weight: 600;
    line-height: 1.3;
}

p {
    margin: 0 0 1.25rem;
}

time {
    font-family: var(--font-mono);
}

/* Running text keeps a readable measure; never the whole page. */
.container {
    width: 100%;
    max-width: var(--container);
    margin-inline: auto;
    padding-inline: var(--space-4);
}

/* ---------------------------------------------------------------------------------------------------------
 * Masthead + navigation
 * A horizontal publication masthead: serif wordmark + tagline left, the four sections right, a hairline under.
 * ------------------------------------------------------------------------------------------------------- */
.masthead {
    border-bottom: 1px solid var(--rule);
    background-color: var(--paper);
}

.masthead__inner {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-3);
    padding-block: var(--space-4) var(--space-3);
}

.masthead__brand {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}

.wordmark {
    color: var(--ink);
    font-family: var(--font-serif);
    font-size: 1.75rem;
    font-weight: 700;
    line-height: 1;
    letter-spacing: -0.01em;
    text-decoration: none;
}

.wordmark:hover,
.wordmark:focus-visible {
    color: var(--accent);
    text-decoration: underline;
    text-decoration-thickness: 1px;
    text-underline-offset: 0.2em;
}

.tagline {
    margin: 0;
    color: var(--muted);
    font-family: var(--font-mono);
    font-size: 0.8125rem;
    letter-spacing: 0.08em;
    line-height: 1.4;
    text-transform: uppercase;
}

.site-nav {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2) var(--space-4);
    font-family: var(--font-sans);
    font-size: 0.9375rem;
}

.site-nav a {
    padding-bottom: 2px;
    border-bottom: 1px solid transparent;
    color: var(--ink);
    text-decoration: none;
}

.site-nav a:hover,
.site-nav a:focus-visible {
    border-bottom-color: var(--accent);
    color: var(--accent);
}

/* The mono kicker that labels a department or a section. */
.kicker {
    margin: 0 0 var(--space-2);
    color: var(--accent);
    font-family: var(--font-mono);
    font-size: 0.8125rem;
    font-weight: 400;
    letter-spacing: 0.08em;
    line-height: 1.4;
    text-transform: uppercase;
}

/* Serif italic interpretation, used under a display headline. */
.standfirst {
    max-width: var(--measure);
    margin: 0 0 var(--space-3);
    color: var(--muted);
    font-family: var(--font-serif);
    font-size: 1.25rem;
    font-style: italic;
    line-height: 1.5;
}

/* ---------------------------------------------------------------------------------------------------------
 * Homepage, layer 2 — the instrument line: a ruled strip with the compact observation card.
 * ------------------------------------------------------------------------------------------------------- */
.instrument-line {
    border-top: 1px solid var(--rule);
    border-bottom: 1px solid var(--rule);
    background-color: var(--panel);
}

.instrument-line__inner {
    display: grid;
    grid-template-columns: minmax(0, 1fr);
    align-items: center;
    gap: var(--space-3) var(--space-5);
    padding-block: var(--space-3);
}

.instrument-line .observation {
    margin: 0;
    padding: 0;
    border: 0;
    background-color: transparent;
}

.instrument-line .observation__value {
    font-size: 1.75rem;
}

.instrument-line__more {
    margin: 0;
    font-family: var(--font-mono);
    font-size: 0.8125rem;
    letter-spacing: 0.04em;
    line-height: 1.4;
}

.instrument-line__more a {
    color: var(--accent);
    text-decoration: none;
    border-bottom: 1px solid var(--accent);
    padding-bottom: 2px;
}

.instrument-line__more a:hover,
.instrument-line__more a:focus-visible {
    background-color: var(--accent);
    color: var(--paper);
}

/* The observation card: full on the Observatory page, compact in the homepage instrument line. */
.observation,
[data-observatory] {
    padding: var(--space-4);
    border-top: 1px solid var(--rule);
    border-bottom: 1px solid var(--rule);
    background-color: var(--panel);
}

.observation__value,
[data-headline] {
    display: flex;
    flex-wrap: wrap;
    align-items: baseline;
    gap: var(--space-1) var(--space-2);
    margin: 0 0 var(--space-2);
    color: var(--ink);
    font-family: var(--font-mono);
    font-size: clamp(2.5rem, 6vw, 4rem);
    font-variant-numeric: tabular-nums;
    font-weight: 600;
    line-height: 1;
}

.observation__value strong,
[data-headline] strong {
    font-weight: 600;
}

.observation__unit {
    color: var(--muted);
    font-family: var(--font-mono);
    font-size: 0.875rem;
    font-weight: 400;
    letter-spacing: 0.04em;
}

.observation__label {
    color: var(--muted);
    font-family: var(--font-mono);
    font-size: 0.8125rem;
    font-weight: 400;
    letter-spacing: 0.08em;
    line-height: 1.4;
    text-transform: uppercase;
}

.observation__date,
.observation__frequency,
.observation__source,
[data-attribution] {
    margin: var(--space-1) 0 0;
    color: var(--muted);
    font-family: var(--font-mono);
    font-size: 0.8125rem;
    line-height: 1.5;
}

.observation__source a,
[data-attribution] a {
    color: var(--accent);
}

.observation__placeholder,
[data-sample] {
    margin: var(--space-2) 0 0;
    padding-left: var(--space-3);
    border-left: 2px solid var(--accent);
    color: var(--muted);
    font-family: var(--font-mono);
    font-size: 0.8125rem;
    line-height: 1.5;
}

/* ---------------------------------------------------------------------------------------------------------
 * Homepage, layer 3 — the lead.
 * ------------------------------------------------------------------------------------------------------- */
.lead {
    padding-block: var(--space-7) var(--space-6);
}

.lead__inner {
    display: grid;
    grid-template-columns: repeat(12, minmax(0, 1fr));
    column-gap: var(--space-4);
}

.lead__inner > * {
    grid-column: 1 / -1;
}

.lead__title {
    margin: 0 0 var(--space-3);
}

.lead__title a {
    color: var(--ink);
    text-decoration: none;
    background-image: linear-gradient(var(--accent), var(--accent));
    background-repeat: no-repeat;
    background-position: 0 100%;
    background-size: 0 1px;
    transition: background-size 150ms ease;
}

.lead__title a:hover,
.lead__title a:focus-visible {
    background-size: 100% 1px;
}

.lead__more {
    margin: var(--space-3) 0 0;
    font-family: var(--font-mono);
    font-size: 0.8125rem;
    letter-spacing: 0.04em;
    line-height: 1.4;
}

.lead__more a {
    color: var(--accent);
    text-decoration: none;
    border-bottom: 1px solid var(--accent);
    padding-bottom: 2px;
}

.lead__more a:hover,
.lead__more a:focus-visible {
    background-color: var(--accent);
    color: var(--paper);
}

/* ---------------------------------------------------------------------------------------------------------
 * Homepage, layer 4 — four departments on a 12-column grid, rules instead of cards.
 * ------------------------------------------------------------------------------------------------------- */
.departments {
    padding-block: var(--space-6);
    border-top: 1px solid var(--rule);
}

.departments__grid {
    display: grid;
    grid-template-columns: repeat(12, minmax(0, 1fr));
    column-gap: var(--space-4);
    row-gap: var(--space-5);
}

.department {
    grid-column: 1 / -1;
    padding-top: var(--space-3);
    border-top: 1px solid var(--rule);
}

.department__index {
    margin: 0 0 var(--space-2);
    color: var(--accent);
    font-family: var(--font-mono);
    font-size: 0.8125rem;
    letter-spacing: 0.08em;
    line-height: 1.4;
}

.department__name {
    margin: 0 0 var(--space-2);
    font-size: 1.6rem;
}

.department__name a {
    color: var(--ink);
    text-decoration: none;
}

.department__name a:hover,
.department__name a:focus-visible {
    color: var(--accent);
    text-decoration: underline;
    text-decoration-thickness: 1px;
    text-underline-offset: 0.18em;
}

.department__description {
    margin: 0 0 var(--space-3);
    color: var(--muted);
    font-size: 0.9375rem;
    line-height: 1.6;
}

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

.department__item {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-1) var(--space-2);
    align-items: baseline;
    margin: 0 0 var(--space-2);
    font-size: 0.9375rem;
    line-height: 1.5;
}

.department__item time {
    color: var(--muted);
    font-size: 0.75rem;
    white-space: nowrap;
}

.department__item a {
    color: var(--ink);
    text-decoration: none;
    border-bottom: 1px solid var(--rule);
}

.department__item a:hover,
.department__item a:focus-visible {
    border-bottom-color: var(--accent);
    color: var(--accent);
}

.department__empty {
    margin: 0;
    color: var(--muted);
    font-family: var(--font-mono);
    font-size: 0.8125rem;
    line-height: 1.5;
}

/* ---------------------------------------------------------------------------------------------------------
 * Homepage, layer 5 — the recent archive: mono date + serif title, rules between entries.
 * ------------------------------------------------------------------------------------------------------- */
.archive {
    padding-block: var(--space-6);
    border-top: 1px solid var(--rule);
}

.archive__inner {
    display: grid;
    grid-template-columns: repeat(12, minmax(0, 1fr));
    column-gap: var(--space-4);
}

.archive__title {
    grid-column: 1 / -1;
    margin-bottom: var(--space-3);
}

.archive__list {
    grid-column: 1 / -1;
    margin: 0;
    padding: 0;
    list-style: none;
    border-top: 1px solid var(--rule);
}

.archive__item {
    display: grid;
    grid-template-columns: minmax(0, 1fr);
    gap: var(--space-1);
    align-items: baseline;
    padding-block: var(--space-3);
    border-bottom: 1px solid var(--rule);
}

.archive__date {
    color: var(--muted);
    font-family: var(--font-mono);
    font-size: 0.8125rem;
    line-height: 1.4;
}

.archive__link {
    color: var(--ink);
    font-family: var(--font-serif);
    font-size: 1.25rem;
    line-height: 1.3;
    text-decoration: none;
}

.archive__link:hover,
.archive__link:focus-visible {
    color: var(--accent);
    text-decoration: underline;
    text-decoration-thickness: 1px;
    text-underline-offset: 0.18em;
}

/* ---------------------------------------------------------------------------------------------------------
 * Section listings: a section masthead over an editorial list (never a bare <ul>).
 * ------------------------------------------------------------------------------------------------------- */
.section-listing {
    padding-block: var(--space-6) var(--space-8);
}

.section-listing__header {
    display: grid;
    grid-template-columns: repeat(12, minmax(0, 1fr));
    column-gap: var(--space-4);
    padding-bottom: var(--space-5);
    border-bottom: 1px solid var(--rule);
}

.section-listing__header > * {
    grid-column: 1 / -1;
}

.section-listing__index {
    margin: 0 0 var(--space-2);
    color: var(--accent);
    font-family: var(--font-mono);
    font-size: 0.8125rem;
    letter-spacing: 0.08em;
    line-height: 1.4;
}

.section-listing__title {
    margin: 0 0 var(--space-2);
}

.section-listing__description {
    max-width: var(--measure);
    margin: 0;
    color: var(--muted);
    font-family: var(--font-serif);
    font-size: 1.25rem;
    font-style: italic;
    line-height: 1.5;
}

.section-listing__header--embedded {
    padding-bottom: var(--space-4);
}

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

.article-list__item {
    padding-block: var(--space-4);
    border-bottom: 1px solid var(--rule);
}

.article-list__entry {
    display: grid;
    grid-template-columns: minmax(0, 1fr);
    gap: var(--space-2);
    align-items: baseline;
}

.article-list__date {
    margin: 0;
    color: var(--muted);
    font-family: var(--font-mono);
    font-size: 0.8125rem;
    line-height: 1.4;
}

.article-list__title {
    margin: 0 0 var(--space-1);
    font-size: 1.6rem;
    line-height: 1.2;
}

.article-list__title a {
    color: var(--ink);
    text-decoration: none;
}

.article-list__title a:hover,
.article-list__title a:focus-visible {
    color: var(--accent);
    text-decoration: underline;
    text-decoration-thickness: 1px;
    text-underline-offset: 0.18em;
}

.article-list__standfirst {
    max-width: var(--measure);
    margin: 0;
    color: var(--muted);
    line-height: 1.6;
}

.article-list__empty {
    padding-block: var(--space-4);
    border-bottom: 1px solid var(--rule);
}

.article-list__empty p {
    margin: 0;
}

.article-list__empty-title {
    font-family: var(--font-serif);
    font-size: 1.25rem;
}

.article-list__empty-note {
    margin-top: var(--space-1) !important;
    color: var(--muted);
    font-size: 0.9375rem;
}

/* ---------------------------------------------------------------------------------------------------------
 * Article pages: wide header, narrower reading measure, numbered sections, drop cap and pull quotes.
 * ------------------------------------------------------------------------------------------------------- */
.page {
    margin: 0;
}

.article {
    display: grid;
    grid-template-columns: repeat(12, minmax(0, 1fr));
    column-gap: var(--space-4);
    padding-block: var(--space-6) 0;
}

.article__header {
    grid-column: 1 / -1;
    max-width: 52rem;
    padding-block: var(--space-5) var(--space-5);
}

.article__header h1 {
    margin: 0 0 var(--space-3);
}

.article__subtitle {
    margin: 0 0 var(--space-2);
    color: var(--muted);
    font-family: var(--font-serif);
    font-size: 1.25rem;
    font-style: italic;
    line-height: 1.5;
}

.article__meta {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-1) var(--space-4);
    margin: var(--space-3) 0 0;
    color: var(--muted);
    font-family: var(--font-mono);
    font-size: 0.8125rem;
    letter-spacing: 0.02em;
    line-height: 1.5;
}

.article__meta > span,
.article__meta > time {
    white-space: nowrap;
}

.article-tags {
    margin: var(--space-2) 0 0;
    color: var(--muted);
    font-family: var(--font-mono);
    font-size: 0.8125rem;
    line-height: 1.5;
}

.article-tags span {
    color: var(--accent);
}

.article-body {
    grid-column: 1 / -1;
    max-width: var(--measure);
    counter-reset: section;
    padding-block: 0 var(--space-7);
}

.article-body > p:first-of-type::first-letter {
    float: left;
    padding-right: 0.08em;
    color: var(--accent);
    font-family: var(--font-serif);
    font-size: 4.2em;
    font-weight: 700;
    line-height: 0.78;
}

.article-body h2 {
    display: grid;
    grid-template-columns: 3rem minmax(0, 1fr);
    column-gap: var(--space-3);
    align-items: baseline;
    margin: var(--space-6) 0 var(--space-3);
    font-size: 1.6rem;
    counter-increment: section;
}

.article-body h2::before {
    content: counter(section);
    color: var(--accent);
    font-family: var(--font-mono);
    font-size: 0.8125rem;
    font-variant-numeric: tabular-nums;
    font-weight: 400;
    letter-spacing: 0.08em;
    line-height: 1.6;
}

.article-body blockquote {
    margin: var(--space-6) 0;
    padding: var(--space-2) 0 var(--space-2) var(--space-4);
    border-left: 2px solid var(--accent);
    color: var(--ink);
    font-family: var(--font-serif);
    font-size: 1.6rem;
    font-style: italic;
    line-height: 1.3;
}

.article-body blockquote p:last-child {
    margin-bottom: 0;
}

.article-body ul,
.article-body ol {
    margin: 0 0 1.25rem;
    padding-left: 1.25rem;
}

.article-body li {
    margin-bottom: var(--space-1);
}

/* Figure slots for the photography/figures that arrive later: numbered caption + "Kilde:" source line. */
.article-body figure {
    margin: var(--space-5) 0;
}

.article-body figure img {
    display: block;
    width: 100%;
}

.article-body figcaption {
    margin-top: var(--space-2);
    color: var(--muted);
    font-family: var(--font-mono);
    font-size: 0.8125rem;
    line-height: 1.5;
}

.article-body .figure-number {
    color: var(--accent);
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.article-body .figure-source {
    display: block;
    margin-top: var(--space-1);
}

/* A short section header used by the Observatory and About pages. */
.page-header {
    padding-block: var(--space-6) var(--space-5);
}

.page-header h1 {
    margin: 0 0 var(--space-2);
}

.page-header .standfirst {
    margin-bottom: 0;
}

/* ---------------------------------------------------------------------------------------------------------
 * Footer / colophon: a deep-accent band carrying the org line, a statement, the four sections and the
 * inspection date.
 * ------------------------------------------------------------------------------------------------------- */
.site-footer {
    margin-top: var(--space-8);
    background-color: var(--accent);
    color: var(--paper);
}

.site-footer a {
    color: var(--paper);
}

.colophon {
    display: grid;
    grid-template-columns: repeat(12, minmax(0, 1fr));
    column-gap: var(--space-4);
    row-gap: var(--space-5);
    padding-block: var(--space-6) var(--space-5);
}

.colophon__brand {
    grid-column: 1 / -1;
}

.colophon__wordmark {
    display: inline-block;
    color: var(--paper);
    font-family: var(--font-serif);
    font-size: 1.75rem;
    font-weight: 700;
    line-height: 1;
    text-decoration: none;
}

.colophon__tagline {
    margin: var(--space-2) 0 0;
    font-family: var(--font-mono);
    font-size: 0.8125rem;
    letter-spacing: 0.08em;
    line-height: 1.4;
    text-transform: uppercase;
}

.colophon__statement {
    max-width: 34rem;
    margin: var(--space-3) 0 0;
    font-family: var(--font-serif);
    font-size: 1.25rem;
    line-height: 1.4;
}

.colophon__nav {
    grid-column: 1 / -1;
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
    font-family: var(--font-sans);
    font-size: 0.9375rem;
}

.colophon__nav a {
    width: fit-content;
    padding-bottom: 2px;
    border-bottom: 1px solid transparent;
    text-decoration: none;
}

.colophon__nav a:hover,
.colophon__nav a:focus-visible {
    border-bottom-color: var(--paper);
}

.colophon__meta {
    grid-column: 1 / -1;
    font-family: var(--font-mono);
    font-size: 0.8125rem;
    line-height: 1.5;
}

.colophon__org {
    margin: var(--space-3) 0 0;
    font-family: var(--font-mono);
    font-size: 0.8125rem;
    line-height: 1.5;
}

.colophon__inspected {
    margin: 0;
}

/* Empty-state text shared by listings and the homepage. */
.listing-empty {
    margin: 0;
    color: var(--muted);
    font-family: var(--font-mono);
    font-size: 0.8125rem;
    line-height: 1.5;
}

/* ---------------------------------------------------------------------------------------------------------
 * Breakpoints. Base styles are the phone layout (<700px); the two queries add the 700–1100 and ≥1100 layouts.
 * ------------------------------------------------------------------------------------------------------- */
@media (min-width: 700px) {
    .masthead__inner {
        flex-direction: row;
        align-items: flex-end;
        justify-content: space-between;
    }

    .instrument-line__inner {
        grid-template-columns: minmax(0, 1fr) auto;
    }

    .lead__inner > .kicker,
    .lead__inner > .lead__title,
    .lead__inner > .standfirst,
    .lead__inner > .lead__more {
        grid-column: 1 / span 10;
    }

    .department {
        grid-column: span 6;
    }

    .archive__item {
        grid-template-columns: 10rem minmax(0, 1fr);
        gap: var(--space-3);
    }

    .article-list__entry {
        grid-template-columns: 10rem minmax(0, 1fr);
        gap: var(--space-3);
    }

    .article__header {
        grid-column: 1 / span 10;
    }

    .article-body {
        grid-column: 1 / span 9;
    }

    .article-body blockquote {
        margin-left: calc(-1 * var(--space-5));
        padding-left: var(--space-4);
    }

    .colophon__brand {
        grid-column: 1 / span 6;
    }

    .colophon__nav {
        grid-column: 7 / span 2;
    }

    .colophon__meta {
        grid-column: 9 / span 4;
        text-align: right;
    }
}

@media (min-width: 1100px) {
    .container {
        padding-inline: var(--space-5);
    }

    .department {
        grid-column: span 3;
    }

    .article__header {
        grid-column: 1 / span 9;
    }

    .article-body {
        grid-column: 1 / span 7;
    }

    .article-body blockquote {
        margin-left: calc(-1 * var(--space-7));
    }
}