/* ============================================================
   DrugHub Watch — Verification Archive
   Aesthetic: Archive Terminal
   Light theme, performance-first single stylesheet
   ============================================================ */

/* ─────────────────────────────────────────────────────────
   0. Fonts — self-hosted WOFF2, latin subset
   ───────────────────────────────────────────────────────── */

@font-face {
    font-family: "IBM Plex Sans";
    src: url("/assets/fonts/ibmplexsans-latin.woff2") format("woff2");
    font-weight: 400 600;
    font-style: normal;
    font-display: swap;
    size-adjust: 100%;
    ascent-override: 100%;
    descent-override: 22%;
    line-gap-override: 0%;
    unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+2000-206F, U+2074, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}

@font-face {
    font-family: "Fraunces";
    src: url("/assets/fonts/fraunces-600-latin.woff2") format("woff2");
    font-weight: 600;
    font-style: normal;
    font-display: swap;
    size-adjust: 99%;
    ascent-override: 88%;
    descent-override: 22%;
    line-gap-override: 0%;
    unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+2000-206F, U+2074, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}

/* ─────────────────────────────────────────────────────────
   1. Reset
   ───────────────────────────────────────────────────────── */

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

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

img, svg { max-width: 100%; display: block; }
button, input, select, textarea { font: inherit; }
a { color: inherit; }

/* ─────────────────────────────────────────────────────────
   2. Variables
   ───────────────────────────────────────────────────────── */

:root {
    /* fonts — Fraunces (display), IBM Plex Sans (body), system mono */
    --font-display: "Fraunces", Georgia, "Iowan Old Style", "Palatino Linotype", serif;
    --font-body: "IBM Plex Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --font-mono: ui-monospace, "SF Mono", SFMono-Regular, "Cascadia Code", "JetBrains Mono", Consolas, monospace;

    /* colors — warm archival palette */
    --color-bg: #F4EEE3;
    --color-surface: #FFFFFF;
    --color-text: #1B1B19;
    --color-text-muted: #6B655D;
    --color-border: #D9CFC0;
    --color-rule: #B8B0A2;
    --color-primary: #B8742C;
    --color-primary-deep: #8E5519;
    --color-primary-soft: rgba(184, 116, 44, 0.18);
    --color-callout-bg: #EFE5D1;
    --color-callout-border: #C9A86A;
    --color-code-bg: #15140F;
    --color-code-bg-soft: rgba(27, 27, 25, 0.06);
    --color-code-text: #E7DEC9;
    --color-focus: #1B1B19;

    /* spacing scale */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    --space-3xl: 4.5rem;

    /* widths */
    --width-article: 760px;
    --width-page: 1180px;
}

/* ─────────────────────────────────────────────────────────
   3. Base body & typography
   ───────────────────────────────────────────────────────── */

body {
    font-family: var(--font-body);
    font-size: 17px;
    line-height: 1.62;
    color: var(--color-text);
    background-color: var(--color-bg);
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.05'/%3E%3C/svg%3E");
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

h1, h2, h3, h4 {
    font-family: var(--font-display);
    font-weight: 600;
    line-height: 1.18;
    color: var(--color-text);
    letter-spacing: -0.01em;
}

h1 {
    font-size: clamp(2.35rem, 1.7rem + 2.6vw, 3.4rem);
    line-height: 1.08;
    letter-spacing: -0.025em;
    font-weight: 600;
    margin-bottom: var(--space-md);
}

h2 {
    font-size: clamp(1.2rem, 1.05rem + 0.55vw, 1.45rem);
    line-height: 1.25;
    letter-spacing: -0.005em;
    font-weight: 600;
    margin-top: var(--space-2xl);
    margin-bottom: var(--space-md);
}

h3 {
    font-size: 1.02rem;
    line-height: 1.35;
    margin-top: var(--space-xl);
    margin-bottom: var(--space-sm);
    font-weight: 600;
}

p, ul, ol { margin-bottom: var(--space-md); }
p { max-width: 70ch; }

article > p:first-of-type {
    font-size: 1.08em;
    color: var(--color-text);
}

em { font-style: italic; }
strong { font-weight: 600; }

/* Focus visibility */
:focus-visible {
    outline: 2px solid var(--color-focus);
    outline-offset: 3px;
}

/* ─────────────────────────────────────────────────────────
   4. Layout structure
   ───────────────────────────────────────────────────────── */

main {
    flex: 1;
    padding: var(--space-xl) var(--space-md) var(--space-3xl);
}

article {
    max-width: var(--width-article);
    margin: 0 auto;
    counter-reset: section;
}

article > section {
    margin-top: var(--space-2xl);
}

/* ─────────────────────────────────────────────────────────
   5. Skip link
   ───────────────────────────────────────────────────────── */

.skip-link {
    position: absolute;
    left: -9999px;
    top: 0;
    background: var(--color-text);
    color: var(--color-bg);
    padding: 0.75rem 1rem;
    text-decoration: none;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    z-index: 100;
}
.skip-link:focus {
    left: var(--space-md);
    top: var(--space-md);
}

/* ─────────────────────────────────────────────────────────
   6. Site header
   ───────────────────────────────────────────────────────── */

body > header {
    border-bottom: 1px solid var(--color-border);
    background: var(--color-bg);
    padding: var(--space-md) var(--space-md);
}
.site-bar {
    max-width: var(--width-page);
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-lg);
    flex-wrap: wrap;
}
.brand {
    text-decoration: none;
    color: var(--color-text);
    display: inline-flex;
    flex-direction: column;
    line-height: 1.1;
}
.brand-name {
    font-family: var(--font-display);
    font-size: 1.35rem;
    font-weight: 600;
    letter-spacing: -0.01em;
}
.brand-tag {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.14em;
    color: var(--color-text-muted);
    margin-top: 0.18rem;
}

nav[aria-label="Primary"] ul {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-lg);
    list-style: none;
    padding: 0;
    margin: 0;
}
nav[aria-label="Primary"] a {
    text-decoration: none;
    color: var(--color-text);
    font-size: 0.95rem;
    padding: 0.35rem 0;
    border-bottom: 2px solid transparent;
    transition: border-color 0.18s ease, color 0.18s ease;
}
nav[aria-label="Primary"] a:hover {
    color: var(--color-primary-deep);
    border-bottom-color: var(--color-primary);
}
nav[aria-label="Primary"] a[aria-current="page"] {
    color: var(--color-primary-deep);
    border-bottom-color: var(--color-primary);
}

/* ─────────────────────────────────────────────────────────
   7. Breadcrumb
   ───────────────────────────────────────────────────────── */

.breadcrumb {
    max-width: var(--width-article);
    margin: 0 auto var(--space-md);
    font-family: var(--font-mono);
    font-size: 0.74rem;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    color: var(--color-text-muted);
}
.breadcrumb ol {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
    list-style: none;
    padding: 0;
    margin: 0;
}
.breadcrumb li::after {
    content: " / ";
    margin-left: 0.4rem;
    color: var(--color-rule);
}
.breadcrumb li:last-child::after { content: ""; }
.breadcrumb a {
    color: var(--color-text-muted);
    text-decoration: none;
    border-bottom: 1px solid transparent;
    transition: color 0.18s ease, border-color 0.18s ease;
}
.breadcrumb a:hover {
    color: var(--color-primary-deep);
    border-bottom-color: var(--color-primary);
}
.breadcrumb li[aria-current="page"] { color: var(--color-text); }

/* ─────────────────────────────────────────────────────────
   8. Article meta (filed / updated)
   ───────────────────────────────────────────────────────── */

.article-meta {
    font-family: var(--font-mono);
    font-size: 0.76rem;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    color: var(--color-text-muted);
    margin-bottom: var(--space-lg);
    padding-bottom: var(--space-md);
    border-bottom: 1px solid var(--color-border);
}
.article-meta time { color: var(--color-text); }
.article-meta .sep {
    color: var(--color-rule);
    margin: 0 0.55em;
}

/* ─────────────────────────────────────────────────────────
   9. Section numbering (signature element)
   ───────────────────────────────────────────────────────── */

article > section > h2 {
    display: flex;
    align-items: baseline;
    gap: 0.55rem;
    flex-wrap: wrap;
}
article > section > h2::before {
    counter-increment: section;
    content: "§ " counter(section, decimal-leading-zero);
    font-family: var(--font-mono);
    font-size: 0.68em;
    font-weight: 500;
    color: var(--color-primary);
    letter-spacing: 0.06em;
    flex: 0 0 auto;
    text-transform: uppercase;
}

/* ─────────────────────────────────────────────────────────
   10. Disclaimer aside
   ───────────────────────────────────────────────────────── */

article > aside[role="note"],
aside.disclaimer {
    background: var(--color-callout-bg);
    border-left: 3px solid var(--color-primary);
    padding: var(--space-md) var(--space-lg);
    margin: var(--space-lg) 0;
}
article > aside[role="note"]::before,
aside.disclaimer::before {
    content: "Disclaimer";
    display: block;
    font-family: var(--font-mono);
    font-size: 0.72rem;
    text-transform: uppercase;
    letter-spacing: 0.14em;
    color: var(--color-primary-deep);
    margin-bottom: 0.45rem;
    font-weight: 600;
}

/* Hero link card — verified onion address, hero position on /  */
.hero-link {
    margin: var(--space-lg) 0 var(--space-xl);
    border: 1px solid var(--color-border);
    border-left: 3px solid var(--color-primary);
    background: var(--color-surface);
    padding: var(--space-lg);
    max-width: none;
}
.hero-link-logo {
    height: 30px;
    width: auto;
    margin-bottom: var(--space-md);
    opacity: 0.95;
}
.hero-link-label {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    text-transform: uppercase;
    letter-spacing: 0.14em;
    color: var(--color-primary-deep);
    margin-bottom: 0.55rem;
    font-weight: 600;
}
.hero-link-value {
    margin: 0 0 var(--space-sm);
    padding: var(--space-md) var(--space-lg);
    background: var(--color-code-bg);
    color: var(--color-code-text);
    font-family: var(--font-mono);
    font-size: 0.95rem;
    line-height: 1.5;
    overflow-wrap: anywhere;
    word-break: break-all;
    max-width: none;
}
.hero-link-value code {
    background: transparent;
    color: inherit;
    padding: 0;
    font-size: 1em;
    border-radius: 0;
}
.hero-link-meta {
    margin: 0;
    font-family: var(--font-mono);
    font-size: 0.76rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-text-muted);
    max-width: none;
}
.hero-link-meta time { color: var(--color-text); }
article > aside[role="note"] p,
aside.disclaimer p {
    margin-bottom: 0;
    max-width: none;
}
article > aside[role="note"] p + p,
aside.disclaimer p + p {
    margin-top: var(--space-sm);
}

/* ─────────────────────────────────────────────────────────
   11. Code & inline data
   ───────────────────────────────────────────────────────── */

code {
    font-family: var(--font-mono);
    font-size: 0.92em;
    background: var(--color-code-bg-soft);
    color: var(--color-text);
    padding: 0.12em 0.4em;
    border-radius: 2px;
    overflow-wrap: anywhere;
}

/* Paragraph that contains only a <code> element — render as inset panel */
p:has(> code:only-child) {
    background: var(--color-code-bg);
    color: var(--color-code-text);
    padding: var(--space-md) var(--space-lg);
    border-left: 3px solid var(--color-primary);
    max-width: none;
    margin: var(--space-lg) 0;
    font-family: var(--font-mono);
    font-size: 0.92rem;
    line-height: 1.55;
    overflow-wrap: anywhere;
    word-break: break-all;
}
p:has(> code:only-child) > code {
    background: transparent;
    color: inherit;
    padding: 0;
    font-size: 1em;
    border-radius: 0;
}

/* ─────────────────────────────────────────────────────────
   12. Quotes & blockquotes
   ───────────────────────────────────────────────────────── */

q { quotes: "\201C" "\201D" "\2018" "\2019"; }
q::before { content: open-quote; }
q::after { content: close-quote; }

blockquote {
    border-left: 3px solid var(--color-rule);
    padding: var(--space-sm) var(--space-md);
    margin: var(--space-lg) 0;
    font-style: italic;
    color: var(--color-text);
    background: rgba(184, 116, 44, 0.05);
}
blockquote p:last-child { margin-bottom: 0; }
cite {
    font-style: normal;
    font-size: 0.85em;
    color: var(--color-text-muted);
    display: block;
    margin-top: 0.5rem;
    font-family: var(--font-mono);
    letter-spacing: 0.05em;
}

/* ─────────────────────────────────────────────────────────
   13. Article body links
   ───────────────────────────────────────────────────────── */

article p a,
article li a,
article aside a {
    color: var(--color-primary-deep);
    text-decoration: none;
    border-bottom: 1px solid var(--color-primary-soft);
    transition: border-color 0.18s ease, color 0.18s ease;
}
article p a:hover,
article li a:hover,
article aside a:hover {
    color: var(--color-primary);
    border-bottom-color: var(--color-primary);
}

/* ─────────────────────────────────────────────────────────
   14. Lists
   ───────────────────────────────────────────────────────── */

article ul, article ol {
    padding-left: 1.4em;
    max-width: 70ch;
}
article li { margin-bottom: 0.4em; }
article li > p { margin-bottom: 0.4em; }

/* ─────────────────────────────────────────────────────────
   15. Related-research nav (after article body)
   ───────────────────────────────────────────────────────── */

.related {
    max-width: var(--width-article);
    margin: var(--space-3xl) auto 0;
    padding-top: var(--space-lg);
    content-visibility: auto;
    contain-intrinsic-size: auto 260px;
    border-top: 1px solid var(--color-border);
}
.related-heading {
    font-family: var(--font-mono);
    font-size: 0.74rem;
    text-transform: uppercase;
    letter-spacing: 0.14em;
    color: var(--color-text-muted);
    font-weight: 600;
    margin-bottom: var(--space-md);
}
.related ul {
    list-style: none;
    padding: 0;
    margin: 0;
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-md);
}
@media (min-width: 720px) {
    .related ul { grid-template-columns: repeat(2, 1fr); }
}
.related li { margin: 0; }
.related a {
    display: block;
    padding: var(--space-md) var(--space-lg);
    border: 1px solid var(--color-border);
    background: var(--color-surface);
    text-decoration: none;
    color: var(--color-text);
    transition: border-color 0.18s ease, transform 0.18s ease, box-shadow 0.18s ease;
    border-left: 3px solid var(--color-rule);
}
.related a:hover {
    border-color: var(--color-primary);
    border-left-color: var(--color-primary);
    transform: translateY(-1px);
    box-shadow: 0 1px 2px rgba(0,0,0,0.04), 0 2px 4px rgba(0,0,0,0.04);
}
.related-label {
    font-family: var(--font-mono);
    font-size: 0.68rem;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    color: var(--color-primary-deep);
    display: block;
    margin-bottom: 0.3rem;
}
.related-title {
    font-family: var(--font-display);
    font-weight: 600;
    font-size: 1.05rem;
    display: block;
    margin-bottom: 0.25rem;
    line-height: 1.2;
}
.related-desc {
    color: var(--color-text-muted);
    font-size: 0.92rem;
    display: block;
    line-height: 1.45;
}

/* ─────────────────────────────────────────────────────────
   16. Site footer
   ───────────────────────────────────────────────────────── */

body > footer {
    border-top: 1px solid var(--color-border);
    background: var(--color-bg);
    padding: var(--space-2xl) var(--space-md) var(--space-lg);
    content-visibility: auto;
    contain-intrinsic-size: auto 420px;
    margin-top: auto;
}
.footer-grid {
    max-width: var(--width-page);
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-xl);
    padding-bottom: var(--space-xl);
}
@media (min-width: 720px) {
    .footer-grid {
        grid-template-columns: 1.5fr 1fr 1fr 1fr;
        gap: var(--space-2xl);
    }
}
.footer-brand .brand-name { font-size: 1.2rem; }
.footer-brand .brand-tag { display: block; margin-top: 0.18rem; }
.footer-brand p {
    margin-top: var(--space-md);
    font-size: 0.92rem;
    color: var(--color-text-muted);
    max-width: 32ch;
    line-height: 1.55;
}

.footer-cluster .footer-label {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.14em;
    color: var(--color-text-muted);
    margin-bottom: var(--space-sm);
    font-weight: 600;
}
nav[aria-label="Footer"] ul,
.footer-cluster ul {
    list-style: none;
    padding: 0;
    margin: 0;
}
nav[aria-label="Footer"] li,
.footer-cluster li { margin-bottom: 0.45rem; }
nav[aria-label="Footer"] a,
.footer-cluster a {
    color: var(--color-text);
    text-decoration: none;
    font-size: 0.92rem;
    border-bottom: 1px solid transparent;
    transition: color 0.18s ease, border-color 0.18s ease;
}
nav[aria-label="Footer"] a:hover,
.footer-cluster a:hover {
    color: var(--color-primary-deep);
    border-bottom-color: var(--color-primary);
}

.footer-base {
    max-width: var(--width-page);
    margin: 0 auto;
    padding-top: var(--space-lg);
    border-top: 1px solid var(--color-border);
    display: flex;
    justify-content: space-between;
    gap: var(--space-md);
    flex-wrap: wrap;
    font-size: 0.85rem;
    color: var(--color-text-muted);
    line-height: 1.5;
}
.footer-base p { margin-bottom: 0; max-width: 60ch; }
.footer-base time {
    color: var(--color-text);
    font-family: var(--font-mono);
    font-size: 0.92em;
    letter-spacing: 0.04em;
}

/* ─────────────────────────────────────────────────────────
   17. Responsive overrides
   ───────────────────────────────────────────────────────── */

@media (max-width: 640px) {
    .site-bar {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--space-md);
    }
    nav[aria-label="Primary"] ul { gap: var(--space-md) var(--space-lg); }
    main { padding: var(--space-lg) var(--space-md) var(--space-2xl); }
    article > section { margin-top: var(--space-xl); }
    h2 { margin-top: var(--space-xl); }
}

/* ─────────────────────────────────────────────────────────
   18. Prefers-reduced-motion
   ───────────────────────────────────────────────────────── */

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.001ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.001ms !important;
        scroll-behavior: auto !important;
    }
}

/* ─────────────────────────────────────────────────────────
   19. Editorial imagery — evidence figures, brand marks
   ───────────────────────────────────────────────────────── */

.evidence {
    margin: var(--space-xl) 0 var(--space-2xl);
}
.evidence img {
    width: 100%;
    height: auto;
    border: 1px solid var(--color-border);
    background: var(--color-surface);
    display: block;
}
.evidence figcaption {
    font-family: var(--font-mono);
    font-size: 0.74rem;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    color: var(--color-text-muted);
    margin-top: var(--space-sm);
    padding-left: var(--space-sm);
    border-left: 2px solid var(--color-rule);
}

.about-logo {
    height: 56px;
    width: auto;
    margin-bottom: var(--space-lg);
}

/* ─────────────────────────────────────────────────────────
   20. Homepage editorial layout — 2-column hero + status rail
   ───────────────────────────────────────────────────────── */

article.home-article {
    max-width: var(--width-page);
}

.hero-zone {
    background: linear-gradient(180deg, var(--color-callout-bg) 0%, transparent 100%);
    border-bottom: 1px solid var(--color-border);
    padding: var(--space-2xl) var(--space-lg) var(--space-2xl);
    margin: 0 0 var(--space-2xl);
}

.hero-grid {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 320px;
    gap: var(--space-2xl);
    align-items: start;
}

.hero-main { min-width: 0; }
.hero-main > .article-meta { margin-bottom: var(--space-lg); }
.hero-main > .lead {
    font-size: 1.05rem;
    line-height: 1.6;
    color: var(--color-text);
    margin-top: var(--space-lg);
    margin-bottom: 0;
    max-width: 60ch;
}

.eyebrow {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    text-transform: uppercase;
    letter-spacing: 0.2em;
    color: var(--color-primary-deep);
    margin: 0 0 var(--space-md);
    font-weight: 600;
}

/* Status rail (right column of hero) */
.status-rail {
    background: var(--color-code-bg);
    color: var(--color-code-text);
    padding: var(--space-lg);
    border-left: 3px solid var(--color-primary);
    font-family: var(--font-mono);
    font-size: 0.84rem;
    line-height: 1.5;
}

.status-rail .rail-section-label {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.18em;
    color: var(--color-primary);
    margin: 0 0 var(--space-sm);
    font-weight: 600;
    max-width: none;
}
.status-rail .rail-data + .rail-section-label,
.status-rail .rail-toc + .rail-section-label { margin-top: var(--space-lg); }

.status-rail .rail-data {
    margin: 0 0 var(--space-sm);
    display: grid;
    grid-template-columns: max-content 1fr;
    gap: 0.55rem var(--space-md);
    padding: var(--space-sm) 0 var(--space-md);
    border-bottom: 1px solid rgba(231, 222, 201, 0.12);
}
.status-rail .rail-data dt {
    text-transform: uppercase;
    font-size: 0.66rem;
    letter-spacing: 0.14em;
    color: rgba(231, 222, 201, 0.55);
    line-height: 1.7;
    margin: 0;
}
.status-rail .rail-data dd {
    margin: 0;
    color: var(--color-code-text);
    font-size: 0.82rem;
    line-height: 1.5;
    overflow-wrap: anywhere;
}

.status-dot {
    display: inline-block;
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: var(--color-primary);
    margin-right: 0.45rem;
    transform: translateY(-1px);
}

.status-rail .rail-toc {
    list-style: none;
    counter-reset: toc;
    padding: 0;
    margin: 0;
    max-width: none;
}
.status-rail .rail-toc li {
    counter-increment: toc;
    padding: 0.5rem 0;
    border-top: 1px solid rgba(231, 222, 201, 0.08);
    display: flex;
    gap: 0.7rem;
    font-size: 0.8rem;
    line-height: 1.4;
    margin: 0;
}
.status-rail .rail-toc li:first-child { border-top: none; padding-top: 0.25rem; }
.status-rail .rail-toc li::before {
    content: counter(toc, decimal-leading-zero);
    color: var(--color-primary);
    flex-shrink: 0;
    font-weight: 600;
}
.status-rail .rail-toc a {
    color: var(--color-code-text);
    text-decoration: none;
    transition: color 120ms ease;
}
.status-rail .rail-toc a:hover,
.status-rail .rail-toc a:focus-visible { color: var(--color-primary); }

/* Re-center evidence/disclaimer/sections inside the wider home-article */
article.home-article > .evidence {
    max-width: 960px;
    margin-left: auto;
    margin-right: auto;
    padding: 0 var(--space-md);
}
article.home-article > aside[role="note"],
article.home-article > section {
    max-width: var(--width-article);
    margin-left: auto;
    margin-right: auto;
    padding-left: var(--space-md);
    padding-right: var(--space-md);
}

/* Anchor offset so the sticky-ish header lands cleanly when jumping */
article.home-article > section {
    scroll-margin-top: var(--space-md);
}

@media (max-width: 880px) {
    .hero-grid {
        grid-template-columns: 1fr;
        gap: var(--space-xl);
    }
    .hero-zone {
        padding: var(--space-xl) var(--space-md);
    }
    .status-rail { padding: var(--space-md); }
}

/* ─────────────────────────────────────────────────────────
   21. Back to Top button
   ───────────────────────────────────────────────────────── */

.back-to-top {
    position: fixed;
    bottom: var(--space-xl);
    right: var(--space-xl);
    z-index: 50;

    display: inline-flex;
    align-items: center;
    gap: 0.45rem;

    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-left: 3px solid var(--color-primary);
    color: var(--color-text-muted);
    font-family: var(--font-mono);
    font-size: 0.72rem;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    text-decoration: none;
    padding: 0.55rem 0.85rem;
    cursor: pointer;

    /* hidden by default */
    opacity: 0;
    transform: translateY(12px);
    pointer-events: none;
    transition: opacity 0.22s ease, transform 0.22s ease,
                border-color 0.18s ease, color 0.18s ease,
                box-shadow 0.18s ease;
}

.back-to-top.is-visible {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
}

.back-to-top:hover,
.back-to-top:focus-visible {
    color: var(--color-primary-deep);
    border-color: var(--color-primary);
    border-left-color: var(--color-primary);
    box-shadow: 0 2px 8px rgba(0,0,0,0.06);
}

.back-to-top svg {
    width: 11px;
    height: 11px;
    stroke: currentColor;
    stroke-width: 2.2;
    fill: none;
    stroke-linecap: round;
    stroke-linejoin: round;
    flex-shrink: 0;
}

@media (max-width: 640px) {
    .back-to-top {
        bottom: var(--space-lg);
        right: var(--space-md);
    }
}

@media (prefers-reduced-motion: reduce) {
    .back-to-top { transition: none; }
}