/* ============================================================
   The Device Layer — an independent publication on trust,
   devices, and irreversible decisions.
   Dark-first with a light theme, long-form typography,
   no build step, no trackers.
   ============================================================ */

:root {
  --bg: #0b0d0e;
  --bg-alt: #0f1214;
  --panel: #14181a;
  --panel-edge: #232a2d;
  --text: #e6eae8;
  --body-text: #c4ccc8;
  --muted: #9aa5a1;
  --faint: #66716d;
  --accent: #4cc38a;
  --accent-bright: #6fdca8;
  --accent-dim: #2f7a58;
  --accent-ink: #4cc38a;
  --font-display: "Space Grotesk", system-ui, sans-serif;
  --font-body: "Inter", system-ui, sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, monospace;
}

:root[data-theme="light"] {
  --bg: #faf9f7;
  --bg-alt: #f2f1ee;
  --panel: #ffffff;
  --panel-edge: #e0e2de;
  --text: #171d1a;
  --body-text: #33403a;
  --muted: #5c6963;
  --faint: #8a948f;
  --accent: #177a4c;
  --accent-bright: #116340;
  --accent-dim: #6db898;
  --accent-ink: #116340;
}

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

html { scroll-behavior: smooth; scroll-padding-top: 84px; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  transition: background 0.2s, color 0.2s;
}

.container { max-width: 1000px; margin: 0 auto; padding: 0 24px; }
.container.narrow { max-width: 740px; }

h1, h2, h3 { font-family: var(--font-display); line-height: 1.15; letter-spacing: -0.015em; }

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

.accent { color: var(--accent); }

.skip-link {
  position: absolute; left: -9999px; top: 0; z-index: 100;
  background: var(--accent); color: #0b0d0e;
  padding: 10px 18px; border-radius: 0 0 8px 0;
  font-family: var(--font-mono); font-size: 0.9rem; text-decoration: none;
}
.skip-link:focus { left: 0; color: #0b0d0e; }

/* ---------- reading progress ---------- */

.progress-bar {
  position: fixed; top: 0; left: 0; height: 3px; width: 0;
  background: var(--accent); z-index: 60;
}

/* ---------- masthead ---------- */

.masthead {
  border-bottom: 1px solid var(--panel-edge);
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  position: sticky; top: 0; z-index: 50;
}
.masthead .container {
  display: flex; align-items: center; gap: 20px;
  height: 64px;
}
.brand {
  display: flex; align-items: center; gap: 10px;
  text-decoration: none; color: var(--text);
  font-family: var(--font-display); font-weight: 700; font-size: 1.02rem;
  white-space: nowrap;
}
.brand:hover { color: var(--text); }
.brand-mark { width: 24px; height: 24px; flex: none; }
.mark-dim { fill: var(--faint); opacity: 0.55; }
.mark-hot { fill: var(--accent); }
.masthead-links { display: flex; gap: 18px; margin-left: auto; align-items: center; }
.masthead-links a {
  color: var(--muted); text-decoration: none;
  font-family: var(--font-mono); font-size: 0.84rem;
  transition: color 0.15s;
}
.masthead-links a:hover,
.masthead-links a[aria-current="page"] { color: var(--accent); }

.theme-toggle {
  background: none; border: 1px solid var(--panel-edge); border-radius: 7px;
  width: 34px; height: 34px; cursor: pointer;
  display: inline-flex; align-items: center; justify-content: center;
  color: var(--muted); flex: none;
}
.theme-toggle:hover { border-color: var(--accent); color: var(--accent); }
.theme-toggle svg { width: 16px; height: 16px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; }
:root[data-theme="light"] .icon-sun { display: none; }
:root:not([data-theme="light"]) .icon-moon { display: none; }

/* ---------- homepage ---------- */

.home-hero {
  padding: clamp(48px, 8vh, 96px) 0 clamp(28px, 4vh, 48px);
  background: radial-gradient(ellipse 75% 60% at 50% 0%, color-mix(in srgb, var(--accent) 8%, transparent), transparent 65%);
}
.home-hero h1 {
  font-size: clamp(1.9rem, 4.6vw, 2.9rem);
  font-weight: 700;
  max-width: 22ch;
  margin-bottom: 0.5em;
}
.proposition { color: var(--muted); font-size: 1.14rem; max-width: 56ch; }

.kicker {
  font-family: var(--font-mono); font-size: 0.78rem;
  letter-spacing: 0.16em; text-transform: uppercase;
  color: var(--accent); margin-bottom: 1.2rem; display: block;
}

.section { padding: clamp(36px, 5vh, 60px) 0; }
.section-rule { border-top: 1px solid var(--panel-edge); }

/* featured essay */
.featured {
  display: block;
  background: var(--panel);
  border: 1px solid var(--panel-edge);
  border-left: 4px solid var(--accent);
  border-radius: 14px;
  padding: clamp(26px, 4vw, 44px);
  text-decoration: none;
  transition: border-color 0.2s, transform 0.2s;
}
.featured:hover { transform: translateY(-2px); border-color: var(--accent-dim); border-left-color: var(--accent); }
.featured .meta-line { margin-bottom: 10px; }
.featured h3 {
  color: var(--text);
  font-size: clamp(1.5rem, 3.4vw, 2.1rem);
  margin-bottom: 12px;
}
.featured:hover h3 { color: var(--accent); }
.featured .argument { color: var(--body-text); font-size: 1.06rem; max-width: 62ch; }
.featured .read-more { margin-top: 18px; }

.meta-line {
  display: flex; flex-wrap: wrap; gap: 6px 14px; align-items: baseline;
  font-family: var(--font-mono); font-size: 0.78rem;
  color: var(--faint); letter-spacing: 0.04em;
}
.meta-line .topic-chip { color: var(--accent); text-transform: uppercase; letter-spacing: 0.1em; }

/* post list */
.post-list { list-style: none; display: grid; gap: 16px; }
.post-item {
  display: block;
  background: var(--panel);
  border: 1px solid var(--panel-edge);
  border-radius: 12px;
  padding: 24px 26px;
  text-decoration: none;
  transition: border-color 0.2s, transform 0.2s;
}
.post-item:hover { border-color: var(--accent-dim); transform: translateY(-2px); }
.post-item h3 { color: var(--text); font-size: 1.24rem; font-weight: 600; margin: 8px 0 8px; }
.post-item:hover h3 { color: var(--accent); }
.post-item p { color: var(--muted); font-size: 0.95rem; }
.read-more {
  display: inline-block; margin-top: 12px;
  font-family: var(--font-mono); font-size: 0.82rem;
  color: var(--accent);
}

.post-item.pending { opacity: 0.75; cursor: default; }
.post-item.pending:hover { transform: none; border-color: var(--panel-edge); }
.post-item.pending:hover h3 { color: var(--text); }
.pending-tag {
  font-family: var(--font-mono); font-size: 0.72rem;
  color: var(--faint); border: 1px dashed var(--panel-edge);
  border-radius: 5px; padding: 2px 8px;
}

/* topic cards */
.topic-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 16px; }
.topic-card {
  display: block;
  background: var(--panel);
  border: 1px solid var(--panel-edge);
  border-radius: 12px;
  padding: 22px 24px;
  text-decoration: none;
  transition: border-color 0.2s, transform 0.2s;
}
.topic-card:hover { border-color: var(--accent-dim); transform: translateY(-2px); }
.topic-card h3 { color: var(--text); font-size: 1.06rem; margin-bottom: 8px; }
.topic-card:hover h3 { color: var(--accent); }
.topic-card p { color: var(--muted); font-size: 0.9rem; }
.topic-card .count { display: inline-block; margin-top: 10px; font-family: var(--font-mono); font-size: 0.76rem; color: var(--faint); }

/* prose blocks */
.prose p { color: var(--muted); margin-bottom: 1.2em; }
.prose strong { color: var(--text); }
.prose em { color: var(--text); }
.prose ul { margin: 0 0 1.2em 1.2em; color: var(--muted); }
.prose li { margin-bottom: 0.5em; }
.prose h2 { font-size: 1.4rem; margin: 1.8em 0 0.6em; }
.prose h3 { font-size: 1.1rem; margin: 1.4em 0 0.5em; }

/* subscribe */
.subscribe-box {
  background: var(--panel);
  border: 1px solid var(--panel-edge);
  border-radius: 14px;
  padding: clamp(24px, 4vw, 36px);
}
.subscribe-box h2 { font-size: 1.4rem; margin-bottom: 8px; }
.subscribe-box > p { color: var(--muted); max-width: 58ch; margin-bottom: 18px; }
.subscribe-form { display: flex; gap: 10px; flex-wrap: wrap; max-width: 480px; }
.subscribe-form input[type="email"] {
  flex: 1 1 220px;
  background: var(--bg);
  border: 1px solid var(--panel-edge);
  border-radius: 8px;
  padding: 11px 14px;
  color: var(--text);
  font-family: var(--font-body); font-size: 0.95rem;
}
.subscribe-form input[type="email"]:focus { outline: 2px solid var(--accent); outline-offset: 1px; border-color: transparent; }
.subscribe-form button {
  background: var(--accent);
  color: #0b1410;
  border: none; border-radius: 8px;
  padding: 11px 22px;
  font-family: var(--font-display); font-weight: 600; font-size: 0.95rem;
  cursor: pointer;
}
:root[data-theme="light"] .subscribe-form button { color: #ffffff; }
.subscribe-form button:hover { background: var(--accent-bright); }
.subscribe-note { margin-top: 12px; font-size: 0.85rem; color: var(--faint); }
.subscribe-note.error { color: #d08a3e; }

/* ---------- article pages ---------- */

.article-wrap { max-width: 740px; margin: 0 auto; padding: clamp(36px, 6vh, 64px) 24px clamp(48px, 7vh, 80px); }

.article-head { margin-bottom: 2.2rem; }
.article-head .meta-line { margin-bottom: 14px; }
.article-head h1 { font-size: clamp(1.8rem, 4.4vw, 2.6rem); margin-bottom: 0.4em; }
.standfirst { color: var(--muted); font-size: 1.15rem; line-height: 1.6; }

.argument-line {
  margin-top: 1.4rem;
  border: 1px solid var(--panel-edge);
  border-left: 3px solid var(--accent);
  border-radius: 0 10px 10px 0;
  background: var(--panel);
  padding: 14px 18px;
  font-size: 0.95rem;
  color: var(--body-text);
}
.argument-line .label {
  display: block;
  font-family: var(--font-mono); font-size: 0.72rem;
  letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--accent); margin-bottom: 4px;
}

.article p { color: var(--body-text); margin-bottom: 1.35em; }
.article h2 {
  font-size: 1.4rem;
  margin: 2em 0 0.7em;
  color: var(--text);
  position: relative;
}
.article ul, .article ol { margin: 0 0 1.35em 1.3em; }
.article li { color: var(--body-text); margin-bottom: 0.7em; }
.article strong { color: var(--text); }
.article em { color: var(--text); }

.anchor-btn {
  margin-left: 8px;
  font-family: var(--font-mono); font-size: 0.8em;
  color: var(--faint); text-decoration: none;
  opacity: 0; transition: opacity 0.15s;
  background: none; border: none; cursor: pointer;
}
.article h2:hover .anchor-btn, .anchor-btn:focus { opacity: 1; }
.anchor-btn:hover { color: var(--accent); }

/* elevated arguments (pull quotes that carry the thesis) */
.article blockquote {
  border-left: 3px solid var(--accent);
  margin: 1.8em 0;
  padding: 0.5em 0 0.5em 1.3em;
}
.article blockquote p {
  font-family: var(--font-display);
  font-size: 1.3rem;
  line-height: 1.4;
  color: var(--text);
  margin: 0;
}

.article code {
  font-family: var(--font-mono);
  font-size: 0.86em;
  background: var(--panel);
  border: 1px solid var(--panel-edge);
  border-radius: 5px;
  padding: 0.12em 0.4em;
  color: var(--accent-ink);
}
.article pre {
  background: var(--bg-alt);
  border: 1px solid var(--panel-edge);
  border-radius: 10px;
  padding: 18px 20px;
  overflow-x: auto;
  margin: 0 0 1.4em;
}
.article pre code {
  background: none; border: none; padding: 0;
  color: var(--body-text);
  font-size: 0.86rem;
  line-height: 1.6;
}

/* chart figures (inline SVG data graphics) */
:root {
  --ch-blue: #5b80e8;
  --ch-amber: #c9832e;
  --ch-green: #2f9e6f;
  --ch-navy: #3b5fa0;
  --ch-mapgreen: #58b97a;
  --ch-neutral: #2a3134;
}
:root[data-theme="light"] {
  --ch-neutral: #d7dcd7;
}
.chart-figure {
  margin: 0 0 1.6em;
  background: var(--panel);
  border: 1px solid var(--panel-edge);
  border-radius: 12px;
  padding: 18px 18px 12px;
}
.chart-figure svg { width: 100%; height: auto; display: block; }
.ch-label { font-family: var(--font-body); font-size: 13px; fill: var(--muted); }
.ch-val { font-family: var(--font-mono); font-size: 13px; fill: var(--text); font-weight: 500; }
.ch-big { font-family: var(--font-display); font-size: 26px; font-weight: 700; fill: var(--text); }
.ch-sub { font-family: var(--font-mono); font-size: 11px; fill: var(--faint); letter-spacing: 0.06em; }
.ch-onnavy, .ch-onnavy.ch-val { fill: #e8ecf5; }
.ch-ongreen, .ch-ongreen.ch-val { fill: #10331f; }
.chart-figure figcaption { padding-top: 10px; }

.hero-figure { margin: 0 0 2.2rem; }
.hero-figure img {
  width: 100%; height: auto; display: block;
  border-radius: 12px;
  border: 1px solid var(--panel-edge);
}

figure { margin: 0 0 1.4em; }
figure img, figure svg { max-width: 100%; height: auto; border-radius: 10px; }
figcaption { font-size: 0.85rem; color: var(--faint); margin-top: 8px; }
figcaption .source { font-family: var(--font-mono); }

/* table of contents */
.toc {
  border: 1px solid var(--panel-edge);
  border-radius: 10px;
  background: var(--panel);
  padding: 18px 22px;
  margin: 0 0 2rem;
  font-size: 0.92rem;
}
.toc-title {
  font-family: var(--font-mono); font-size: 0.74rem;
  letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--faint); margin-bottom: 10px;
}
.toc ol { list-style: none; margin: 0; }
.toc li { margin-bottom: 6px; }
.toc a { color: var(--muted); text-decoration: none; }
.toc a:hover { color: var(--accent); }

/* footnotes */
.footnotes {
  margin-top: 2.5rem;
  padding-top: 1.4rem;
  border-top: 1px solid var(--panel-edge);
  font-size: 0.88rem;
}
.footnotes ol { margin-left: 1.2em; }
.footnotes li { color: var(--muted); margin-bottom: 0.6em; }
sup.fn { font-size: 0.72em; }
sup.fn a { text-decoration: none; }

/* disclosure note */
.disclosure-note {
  margin: 2rem 0 0;
  padding: 14px 18px;
  border: 1px solid var(--panel-edge);
  border-radius: 10px;
  background: var(--bg-alt);
  font-size: 0.88rem;
  color: var(--muted);
}
.disclosure-note strong { color: var(--text); }

/* ---------- trust ledger ---------- */

.trust-ledger {
  margin-top: 2.6rem;
  border: 1px solid var(--accent-dim);
  border-radius: 12px;
  overflow: hidden;
}
.trust-ledger summary {
  cursor: pointer;
  list-style: none;
  padding: 16px 20px;
  background: color-mix(in srgb, var(--accent) 7%, var(--panel));
  font-family: var(--font-mono); font-size: 0.86rem;
  color: var(--text);
  display: flex; align-items: center; gap: 10px;
}
.trust-ledger summary::-webkit-details-marker { display: none; }
.trust-ledger summary::before { content: "▸"; color: var(--accent); transition: transform 0.15s; }
.trust-ledger[open] summary::before { transform: rotate(90deg); }
.trust-ledger summary .tl-sub { color: var(--faint); font-size: 0.76rem; margin-left: auto; }
.trust-ledger-body { padding: 6px 20px 18px; background: var(--panel); }
.trust-ledger h3 {
  font-family: var(--font-mono); font-size: 0.74rem;
  letter-spacing: 0.13em; text-transform: uppercase;
  color: var(--accent); margin: 16px 0 6px;
}
.trust-ledger p, .trust-ledger li { font-size: 0.88rem; color: var(--muted); margin-bottom: 0.4em; }
.trust-ledger ul { list-style: none; }
.trust-ledger li { padding-left: 16px; position: relative; }
.trust-ledger li::before { content: "–"; position: absolute; left: 0; color: var(--faint); }
.trust-ledger a { color: var(--accent-ink); }
.tl-dates {
  display: flex; flex-wrap: wrap; gap: 6px 24px;
  margin-top: 14px; padding-top: 12px;
  border-top: 1px solid var(--panel-edge);
  font-family: var(--font-mono); font-size: 0.76rem; color: var(--faint);
}

/* prev / next */
.pager {
  display: grid; grid-template-columns: 1fr 1fr; gap: 14px;
  margin-top: 2.4rem;
}
.pager a {
  display: block;
  border: 1px solid var(--panel-edge);
  border-radius: 10px;
  padding: 14px 16px;
  text-decoration: none;
  transition: border-color 0.2s;
}
.pager a:hover { border-color: var(--accent-dim); }
.pager .dir { font-family: var(--font-mono); font-size: 0.72rem; color: var(--faint); text-transform: uppercase; letter-spacing: 0.1em; }
.pager .title { display: block; color: var(--text); font-size: 0.92rem; margin-top: 4px; }
.pager a:hover .title { color: var(--accent); }
.pager .next { text-align: right; grid-column: 2; }

/* related */
.related { margin-top: 2.4rem; }
.related h2 { font-size: 1.05rem; font-family: var(--font-mono); font-weight: 500; color: var(--muted); margin-bottom: 1rem; }

.article-foot { margin-top: 2.6rem; padding-top: 1.4rem; border-top: 1px solid var(--panel-edge); }
.back { font-family: var(--font-mono); font-size: 0.88rem; text-decoration: none; }

/* ---------- search ---------- */

.search-input {
  width: 100%;
  background: var(--panel);
  border: 1px solid var(--panel-edge);
  border-radius: 10px;
  padding: 14px 18px;
  color: var(--text);
  font-family: var(--font-body); font-size: 1.05rem;
  margin-bottom: 1.4rem;
}
.search-input:focus { outline: 2px solid var(--accent); outline-offset: 1px; }
.search-status { font-family: var(--font-mono); font-size: 0.84rem; color: var(--faint); margin-bottom: 1rem; }
.search-result mark {
  background: color-mix(in srgb, var(--accent) 28%, transparent);
  color: var(--text);
  border-radius: 3px; padding: 0 2px;
}

/* ---------- editorial pages ---------- */

.page-head { padding: clamp(40px, 7vh, 72px) 0 8px; }
.page-head h1 { font-size: clamp(1.7rem, 4vw, 2.4rem); margin-bottom: 0.4em; }
.page-head .lede { color: var(--muted); font-size: 1.1rem; max-width: 60ch; }

dl.policy-list dt { font-weight: 600; color: var(--text); margin-top: 1.2em; font-family: var(--font-display); }
dl.policy-list dd { color: var(--muted); margin-left: 0; }

table.plain {
  width: 100%; border-collapse: collapse; margin: 0 0 1.4em;
  font-size: 0.92rem;
}
table.plain th, table.plain td {
  text-align: left; padding: 10px 14px;
  border-bottom: 1px solid var(--panel-edge);
  color: var(--muted);
}
table.plain th { color: var(--text); font-family: var(--font-mono); font-size: 0.78rem; letter-spacing: 0.08em; text-transform: uppercase; }
.table-scroll { overflow-x: auto; }

/* ---------- footer ---------- */

.footer {
  border-top: 1px solid var(--panel-edge);
  padding: 40px 0 48px;
  background: var(--bg-alt);
  margin-top: clamp(32px, 6vh, 64px);
}
.footer-cols {
  display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 32px;
}
.footer-brand { display: flex; align-items: flex-start; gap: 10px; color: var(--muted); font-size: 0.92rem; }
.footer-brand .brand-mark { width: 22px; height: 22px; margin-top: 2px; }
.footer h4 {
  font-family: var(--font-mono); font-size: 0.74rem;
  letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--faint); margin-bottom: 12px;
}
.footer ul { list-style: none; }
.footer li { margin-bottom: 8px; }
.footer li a { color: var(--muted); text-decoration: none; font-size: 0.9rem; }
.footer li a:hover { color: var(--accent); }
.footer-note { color: var(--faint); font-size: 0.82rem; margin-top: 28px; }

/* ---------- responsive / a11y / print ---------- */

@media (max-width: 720px) {
  .masthead-links { gap: 12px; }
  .masthead-links a { font-size: 0.78rem; }
  .footer-cols { grid-template-columns: 1fr; gap: 24px; }
  .pager { grid-template-columns: 1fr; }
  .pager .next { grid-column: auto; text-align: left; }
  body { font-size: 16px; }
}

@media (max-width: 560px) {
  .masthead .container { flex-wrap: wrap; height: auto; padding-top: 10px; padding-bottom: 10px; }
  .masthead-links { margin-left: 0; width: 100%; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; animation: none !important; }
}

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

@media print {
  .masthead, .footer, .pager, .related, .progress-bar, .theme-toggle,
  .article-foot, .anchor-btn, .skip-link { display: none !important; }
  body { background: #fff; color: #111; font-size: 11pt; }
  .article p, .article li { color: #222; }
  .article h1, .article h2, .article blockquote p, .article strong { color: #000; }
  .article blockquote { border-left-color: #000; }
  .trust-ledger { border-color: #999; }
  .trust-ledger summary { background: #f2f2f2; color: #000; }
  .trust-ledger[open] .trust-ledger-body, .trust-ledger-body { display: block; }
  a { color: #000; text-decoration: underline; }
  .article a[href^="http"]::after { content: " (" attr(href) ")"; font-size: 0.8em; color: #444; }
}