/* ECHO interiors: one visual language, different rhythms for reading and working. */
.echo-interior {
  color-scheme: dark;
  --bg: var(--echo-ground);
  --panel: var(--echo-surface);
  --text: var(--echo-ink);
  --muted: var(--echo-ink-muted);
  --dim: var(--echo-ink-muted);
  --accent: var(--echo-core);
  --line: var(--echo-line);
  --line-strong: var(--echo-line-strong);
  --novel-line: var(--line);
  --cyan: var(--accent);
  --green: var(--accent);
  --blue: var(--echo-ink-muted);
  --violet: var(--echo-ink-muted);
  --paper: var(--text);
  --gutter: clamp(22px, 5vw, 80px);
  --mono: var(--echo-font-telemetry);
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--echo-font-sans);
  -webkit-font-smoothing: antialiased;
}
.echo-interior *, .echo-interior *::before, .echo-interior *::after { box-sizing: border-box; }
.echo-interior :is(a, button, input, select, textarea):focus-visible { outline: 2px solid var(--accent); outline-offset: 5px; }
.echo-interior [hidden] { display: none !important; }
.echo-interior :is(.kicker, .eyebrow) { color: var(--muted); font: 400 11px/1.6 var(--echo-font-display); letter-spacing: .22em; text-transform: uppercase; }
.echo-interior :is(.locale-switch button, .quiet, .copy-btn) { min-height: 44px; min-width: 44px; color: var(--muted); font-size: 11px; }
.echo-interior .locale-switch button[aria-pressed='true'] { color: var(--accent); }
.echo-interior .back-echo { min-height: 40px; border: 1px solid var(--line-strong); border-radius: var(--echo-radius-sm); color: var(--text); font-size: 11px; background: transparent; }
.echo-interior .back-echo:hover { background: var(--echo-line); }
.echo-interior :is(.novel-header, .dev-header) { height: 82px; border-bottom: 1px solid var(--line); }
.echo-interior :is(.novel-header, .dev-header)::before { background: var(--echo-glass); backdrop-filter: blur(var(--echo-blur-glass)) saturate(140%); }
.echo-interior :is(.universe-brand, .dev-brand) { align-items: center; min-height: 44px; }
.echo-interior :is(.universe-nav, .dev-nav) a { display: inline-flex; align-items: center; min-height: 44px; font-size: 11px; color: var(--muted); }
.echo-interior :is(.universe-nav, .dev-nav) a:hover { color: var(--echo-ink); text-shadow: none; }
.echo-interior :is(.universe-nav, .dev-nav) a::after { background: var(--accent); }
.echo-interior section[id] { scroll-margin-top: 105px; }
.interior-actions { display: flex; align-items: center; gap: 30px; margin-top: 32px; font-size: 13px; }
.interior-primary { display: inline-flex; align-items: center; justify-content: space-between; gap: 50px; min-height: 50px; padding: 0 22px; background: var(--echo-action); color: var(--echo-on-action); border-radius: var(--echo-radius-sm); font-weight: 500; transition: opacity var(--echo-duration-fast) var(--echo-ease); }
.interior-primary:hover { opacity: .88; }
.interior-actions > a:last-child { padding-block: 14px; color: var(--text); }

/* Fiction archive */
.archive-edition .novel-home { background: var(--bg); }
.archive-edition .novel-hero { min-height: 810px; padding: 160px 0 76px; background: radial-gradient(ellipse at 78% 45%, rgba(52, 59, 69, .231), transparent 52%); }
.archive-edition .novel-hero::before { opacity: .25; background-image: linear-gradient(rgba(130, 143, 161, .071) 1px, transparent 1px), linear-gradient(90deg, rgba(130, 143, 161, .071) 1px, transparent 1px); background-size: 72px 72px; mask-image: linear-gradient(90deg, transparent, #000); }
.archive-edition .novel-hero::after { display: none; }
.archive-coordinate { position: absolute; top: 112px; inset-inline: var(--gutter); display: flex; justify-content: space-between; gap: 12px; color: var(--dim); font: 9px var(--mono); letter-spacing: .16em; }
.archive-edition .novel-hero-grid { max-width: 1320px; grid-template-columns: 1.1fr .9fr; gap: clamp(30px, 6vw, 90px); }
.archive-edition .novel-path { margin-bottom: 38px; font-size: 9px; color: var(--dim); }
.archive-edition .novel-path a { color: var(--muted); }
.archive-edition .novel-hero-copy h1 span { max-width: none; font-family: var(--echo-font-display); font-size: clamp(44px, 5.4vw, 78px); font-weight: 400; letter-spacing: .02em; line-height: 1.05; color: var(--text); }
.archive-edition .novel-hero-copy h1 strong { margin-top: 26px; font-size: clamp(25px, 2.8vw, 38px); letter-spacing: .22em; color: var(--echo-ink-muted); font-weight: 400; }
.archive-edition .novel-deck { max-width: 510px; color: var(--muted); font-size: 14px; }
.archive-edition .novel-hero-actions :is(a, button) { min-height: 50px; border-radius: var(--echo-radius-sm); font-size: 12px; }
.archive-edition .primary-action { background: var(--echo-action); color: var(--echo-on-action); border-color: var(--echo-action); box-shadow: none; padding-inline: 22px; min-width: 170px; font-weight: 500; }
.archive-edition .primary-action:hover { opacity: .88; }
.archive-edition .primary-action b { color: var(--echo-on-action); }
.archive-edition .follow-button { min-width: 154px; color: var(--muted); background: transparent; }
.archive-edition .follow-button :is(i, span) { color: inherit; }
.archive-edition .follow-button.active { color: var(--echo-core); border-color: var(--echo-core); }
.archive-edition .novel-metadata { margin-top: 36px; }
.archive-edition .novel-metadata small { color: var(--dim); font-size: 10px; }
.archive-edition .novel-metadata b { color: var(--muted); font-size: 10px; }
.archive-edition .novel-cover-stage { min-height: 580px; }
.archive-edition .archive-rings { width: 550px; border-color: var(--echo-line); }
.archive-edition .archive-rings i { border-color: var(--echo-line); animation: none; }
.archive-edition .novel-cover { width: min(100%, 420px); aspect-ratio: .76; padding: 26px; border-radius: var(--echo-radius-md); border-color: var(--echo-line-strong); overflow: hidden; transform: rotate(-3deg); background: var(--echo-surface-raised); box-shadow: var(--echo-shadow-window); transition: transform .6s ease; }
.archive-edition .novel-cover-stage:hover .novel-cover { transform: rotate(0); }
.archive-cover-art { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; object-position: 52% center; filter: saturate(.65); }
.archive-edition .novel-cover::before { z-index: 1; inset: 0; width: auto; background: linear-gradient(180deg, rgba(9, 10, 12, .533), transparent 30%, rgba(9, 10, 12, .8) 72%, var(--echo-surface)); }
.archive-edition .novel-cover > :not(img) { z-index: 2; position: relative; }
.archive-edition .novel-cover :is(header, footer) { color: var(--echo-ink); font-size: 9px; }
.archive-edition .novel-cover :is(header b, footer b) { color: var(--echo-ink); }
.archive-edition .cover-signal { display: none; }
.archive-edition .cover-title { margin-top: auto; padding: 36px 0; }
.archive-edition .cover-title small { font-size: 9px; color: var(--echo-ink-muted); }
.archive-edition .cover-title strong { font-family: var(--echo-font-display); font-size: clamp(24px, 2.6vw, 36px); font-weight: 400; letter-spacing: .04em; line-height: 1.12; color: var(--echo-ink); }
.archive-edition .cover-title p { font-size: 13px; color: var(--echo-ink); }
.archive-edition .novel-cover footer { margin-top: 0; }
.archive-edition .cover-caption { bottom: 1%; left: -3%; border-radius: var(--echo-radius-md); background: var(--echo-glass); backdrop-filter: blur(var(--echo-blur-glass)) saturate(140%); border-color: var(--line); padding: 15px 22px; }
.archive-edition .cover-caption span { font-size: 10px; color: var(--muted); }
.archive-edition .cover-caption b { color: var(--echo-ink); font-size: 11px; font-weight: 500; }
.archive-edition .serial-state { background: var(--echo-surface); }
.archive-edition .status-grid article { gap: 18px; padding: 26px 18px; min-height: 128px; }
.archive-edition .status-grid article > span { color: var(--echo-ink); font-family: var(--echo-font-mono); font-size: 30px; font-weight: 400; letter-spacing: -.02em; }
.archive-edition .status-grid small { color: var(--dim); font-size: 10px; }
.archive-edition .status-grid strong { color: var(--text); font-size: 11px; }
.archive-edition :is(.novel-section-heading h2, .editorial-copy h2) { color: var(--text); font-weight: 500; font-size: clamp(32px, 4vw, 52px); letter-spacing: -.04em; line-height: 1.25; }
.archive-edition :is(.novel-section-heading > p, .editorial-copy p:not(.kicker)) { color: var(--muted); font-size: 13px; }
.archive-edition .chapter-row { min-height: 158px; grid-template-columns: 80px 1fr 195px; gap: 24px; padding: 28px 10px; }
.archive-edition .chapter-live { position: relative; padding: 26px; padding-left: 228px; min-height: 230px; background: var(--echo-surface); border: 1px solid var(--line); border-radius: var(--echo-radius-md); }
.chapter-thumbnail { position: absolute; width: 170px; height: calc(100% - 48px); left: 24px; top: 24px; object-fit: cover; border-radius: var(--echo-radius-sm); filter: saturate(.55); }
.archive-edition .chapter-live:hover { background: var(--echo-surface-raised); border-color: var(--line-strong); }
.archive-edition .chapter-number { font: 10px var(--mono); color: var(--dim); }
.archive-edition .chapter-copy small { color: var(--dim); font: 9px var(--mono); }
.archive-edition .chapter-copy h3 { color: var(--text); font-size: 29px; font-weight: 500; }
.archive-edition .chapter-copy p { color: var(--muted); font-size: 12px; line-height: 1.8; }
.archive-edition .chapter-state :is(span, i) { color: var(--echo-ink-muted); font-size: 10px; }
.archive-edition .chapter-state i { color: var(--echo-core); font-size: 25px; }
.archive-edition .badge { border-radius: var(--echo-radius-xs); padding: 6px 8px; background: transparent; border-color: var(--line-strong); color: var(--muted); font: 500 10px var(--mono); letter-spacing: .08em; }
.archive-edition .badge.candidate { color: var(--echo-ink); } /* neutral; the dashed candidate line comes from universe/styles.css */
.archive-edition .chapter-planned { opacity: .8; }
.archive-edition .editorial-section { background: linear-gradient(var(--echo-surface), var(--echo-ground)); }
.archive-edition .editorial-layout { gap: 60px; }
.archive-edition :is(.editorial-protocol article, .governance-detail, .editorial-note) { border-radius: var(--echo-radius-md); background: var(--echo-surface); border-color: var(--line); }
.archive-edition .editorial-protocol b { font-size: 13px; color: var(--text); }
.archive-edition .editorial-protocol p { font-size: 11px; color: var(--muted); }
.archive-edition .governance-step { padding: 22px 18px; grid-template-columns: 24px minmax(0, 1fr) auto; gap: 12px; }
.archive-edition .governance-step > span { color: var(--dim); }
.archive-edition .governance-step > i { font-size: 10px; color: var(--dim); }
.archive-edition .governance-step > i:is(.active, .done) { color: var(--echo-core); }
.archive-edition .governance-detail { padding: 26px 20px; }
.archive-edition .governance-detail header > strong { color: var(--echo-ink); font-family: var(--echo-font-mono); font-size: 32px; font-weight: 400; }
.archive-edition .resonance-actions button { background: transparent; border-color: var(--line-strong); border-radius: var(--echo-radius-sm); color: var(--muted); font-size: 12px; }
.archive-edition .resonance-actions button.active { color: var(--echo-core); border-color: var(--echo-core); background: var(--echo-core-soft); box-shadow: none; }
.archive-edition .resonance-meter i { background: var(--echo-core); box-shadow: none; }
.archive-edition .resonance-split small { color: var(--dim); font-size: 10px; }
.archive-edition .editorial-note { padding: 24px; }
.archive-edition .editorial-note b { color: var(--echo-ink); font: 400 11px var(--echo-font-display); letter-spacing: .22em; }
.archive-edition .editorial-note p { color: var(--muted); font-size: 11px; }
.archive-edition .novel-footer { color: var(--dim); border-color: var(--line); }
.archive-edition .novel-footer a { color: var(--echo-ink); }

/* Reader: quieter contrast, generous type, and a complete paper palette. */
.reader-edition { --reader-ink: color-mix(in srgb, var(--echo-ink) 88%, var(--echo-ink-muted)); --reader-soft: var(--echo-ink-muted); --reader-faint: color-mix(in srgb, var(--echo-ink-muted) 82%, var(--echo-ink-faint)); --reader-panel: var(--echo-surface); --reader-bar: var(--echo-glass); background: var(--echo-ground); }
/* Paper is a snow island (reader.js sets data-echo-theme="snow" on <body>): chrome uses the snow tokens, the stock stays warm. */
.reader-edition[data-theme='paper'] { --accent: var(--echo-core); --text: var(--echo-ink); --muted: var(--echo-ink-muted); --reader-ink: #26282d; --reader-soft: var(--echo-ink-muted); --reader-faint: #646b75; --reader-panel: #e6e2d9; --reader-bar: rgba(238, 235, 228, .95); --line: var(--echo-line-strong); --line-strong: rgba(10, 12, 16, .24); background: #eeebe4; }
.reader-edition .reader-header { min-height: 78px; border-color: var(--line); background: var(--reader-bar); backdrop-filter: blur(var(--echo-blur-glass)) saturate(140%); }
.reader-edition .reader-back { min-height: 44px; color: var(--reader-soft); font-size: 11px; }
.reader-edition .reader-back span { color: var(--reader-soft); font-size: 20px; }
.reader-edition .reader-title small { font: 9px var(--mono); color: var(--reader-faint); }
.reader-edition .reader-title strong { font-size: 12px; color: var(--reader-ink); }
.reader-edition .reader-actions > button { display: inline-flex; align-items: center; justify-content: center; min-width: 44px; min-height: 44px; border-radius: 3px; font-size: 12px; background: var(--reader-panel); color: var(--reader-soft); border-color: var(--line); }
.reader-edition .reader-actions #theme-toggle { gap: 8px; }
.reader-edition .reader-shell { grid-template-columns: 160px minmax(0, 730px) 60px; padding-top: 138px; gap: clamp(28px, 5vw, 72px); }
.reader-edition .reader-rail > a { color: var(--reader-soft); font: 10px var(--mono); }
.reader-edition .rail-index { color: var(--reader-ink); font-family: var(--echo-font-mono); font-size: 64px; font-weight: 400; letter-spacing: -.04em; }
.reader-edition .reader-rail dt { font-size: 10px; color: var(--reader-faint); }
.reader-edition .reader-rail dd { font-size: 10px; color: var(--reader-soft); }
.reader-edition .reader-rail dl div { border-color: var(--line); }
.reader-edition .rail-spine span { color: var(--reader-faint); font-size: 8px; }
.reader-edition .rail-spine i { background: linear-gradient(var(--line-strong), transparent); }
.reader-edition .reader-breadcrumb { color: var(--reader-faint); font-size: 8px; flex-wrap: wrap; }
.reader-edition .reader-breadcrumb a { color: var(--reader-soft); }
.reader-edition :is(.candidate-banner, .resume-prompt, .language-note) { background: var(--reader-panel); border-color: var(--line); border-radius: var(--echo-radius-md); }
.reader-edition .candidate-banner { margin-top: 26px; grid-template-columns: 1fr; gap: 8px; padding: 17px 20px; border-left: 2px solid var(--line-strong); }
.reader-edition :is(.candidate-banner b, .language-note b, .resume-prompt p b) { color: var(--reader-ink); font: 500 10px var(--mono); letter-spacing: .08em; }
.reader-edition :is(.candidate-banner p, .language-note p, .resume-prompt p) { color: var(--reader-soft); font-size: 11px; }
.reader-edition .chapter-heading { padding: 64px 0 50px; }
.reader-edition .chapter-heading h1 span { color: var(--reader-ink); font-size: clamp(42px, 6vw, 68px); letter-spacing: .14em; }
.reader-edition .chapter-heading h1 small { font-size: 10px; color: var(--reader-faint); }
.reader-edition .chapter-logline { color: var(--reader-soft); font-size: 16px; }
.reader-edition .chapter-byline { color: var(--reader-faint); font-size: 10px; flex-wrap: wrap; }
.reader-frontispiece { position: relative; overflow: hidden; margin: 44px 0 0; aspect-ratio: 2.25; border: 1px solid var(--line); }
.reader-frontispiece::after { content: ''; position: absolute; inset: 0; background: linear-gradient(transparent 45%, rgba(9, 10, 12, .851)); }
.reader-frontispiece img { width: 100%; height: 100%; object-fit: cover; object-position: center 45%; filter: saturate(.5); }
.reader-frontispiece figcaption { position: absolute; left: 24px; bottom: 20px; z-index: 1; text-align: left; color: var(--echo-ink); font: 9px/1.7 var(--mono); letter-spacing: .12em; }
.reader-edition .chapter-body { color: var(--reader-ink); line-height: 2.1; letter-spacing: .03em; }
.reader-edition .chapter-body .chapter-opening::first-letter { color: var(--reader-ink); }
.reader-edition .chapter-illustration { margin: 60px 0 68px; }
.reader-edition .chapter-illustration-frame { border-radius: var(--echo-radius-md); border-color: var(--line); box-shadow: none; }
.reader-edition .chapter-illustration-index { color: var(--reader-faint); font-size: 9px; }
.reader-edition .chapter-illustration figcaption strong { color: var(--reader-ink); font-size: 13px; }
.reader-edition .chapter-illustration figcaption p { color: var(--reader-soft); font-size: 11px; }
.reader-edition .preview-end { background: var(--reader-panel); border: 1px solid var(--line); border-radius: var(--echo-radius-lg); padding: 42px; }
.reader-edition .preview-end h2 { color: var(--reader-ink); }
.reader-edition .preview-end > p:not(.kicker) { color: var(--reader-soft); font-size: 13px; }
.reader-edition :is(.preview-actions a, .preview-actions button, .resume-prompt button) { min-height: 44px; border-radius: var(--echo-radius-sm); color: var(--reader-soft); border-color: var(--line-strong); font-size: 11px; }
.reader-edition .preview-actions i { color: var(--accent); }
.reader-edition .chapter-footnote { color: var(--reader-faint); border-color: var(--line); font-size: 9px; }
.reader-edition .chapter-footnote b { color: var(--reader-soft); }
.reader-edition .reader-margin { color: var(--reader-faint); }
.reader-edition .reading-progress i { background: var(--accent); box-shadow: none; }
.echo-interior .novel-toast { border-radius: var(--echo-radius-sm); color: var(--text); border-color: var(--line); background: var(--echo-glass); backdrop-filter: blur(var(--echo-blur-glass)) saturate(140%); font-size: 12px; }

/* Developer center */
.developer-edition main { max-width: 1320px; padding-top: 0; }
.developer-edition .dev-header { padding: 0; }
.developer-edition .dev-hero { display: grid; grid-template-columns: 1.1fr .9fr; gap: 55px; padding: 155px 0 0; }
.dev-wordmark { margin: 30px 0 26px; font-family: var(--echo-font-display); font-size: clamp(30px, 3.6vw, 50px); line-height: 1.16; font-weight: 400; letter-spacing: .02em; }
.dev-wordmark em { color: var(--echo-ink-muted); font-style: normal; }
.developer-edition .dev-hero h1 { max-width: none; font-size: clamp(22px, 2.5vw, 32px); font-weight: 400; line-height: 1.35; margin-bottom: 18px; }
.developer-edition .lead { max-width: 480px; font-size: 14px; }
.api-observatory { position: relative; align-self: center; padding: 22px; border: 1px solid var(--line); background: radial-gradient(circle at 50% 42%, rgba(238, 241, 244, .04), transparent 60%), linear-gradient(rgba(238, 241, 244, .03) 1px, transparent 1px), linear-gradient(90deg, rgba(238, 241, 244, .03) 1px, transparent 1px), var(--echo-surface); background-size: auto, 28px 28px, 28px 28px, auto; border-radius: var(--echo-radius-lg); }
.observatory-top, .observatory-bottom { display: flex; justify-content: space-between; gap: 12px; font: 8px var(--mono); letter-spacing: .1em; color: var(--dim); }
.observatory-top b { color: var(--echo-ink-muted); font-weight: 400; }
.api-orbit { position: relative; height: 245px; display: grid; place-items: center; }
.api-orbit i { position: absolute; top: 50%; left: 50%; border: 1px solid var(--echo-line-strong); border-radius: 50%; width: 200px; height: 200px; transform: translate(-50%, -50%); }
.api-orbit i:nth-child(2) { width: 240px; height: 110px; transform: translate(-50%, -50%) rotate(-36deg); border-color: var(--echo-line-strong); }
.api-orbit i:nth-child(3) { width: 110px; height: 110px; border-style: dashed; border-color: var(--echo-line); }
.api-orbit strong { position: relative; width: 76px; color: var(--echo-ink); line-height: 0; }
.api-orbit strong .echo-mark { width: 100%; height: auto; }
.api-orbit > span { position: absolute; right: 0; bottom: 32px; font: 8px var(--mono); letter-spacing: .15em; color: var(--dim); }
.api-route { display: flex; align-items: center; gap: 10px; border: 1px solid var(--line-strong); border-radius: var(--echo-radius-sm); background: var(--echo-surface-sunken); padding: 16px 12px; font: 11px var(--mono); }
.api-route span { color: var(--accent); font-size: 10px; }
.api-route code { color: var(--text); overflow-wrap: anywhere; }
.api-route b { margin-left: auto; font-weight: 400; color: var(--accent); }
.api-nodes { display: flex; justify-content: space-between; gap: 8px; padding: 24px 0; font: 8px var(--mono); color: var(--muted); }
.api-nodes span::before { content: '↳ '; color: var(--echo-ink-faint); }
.observatory-bottom { border-top: 1px solid var(--line); padding-top: 16px; }
.developer-edition .hero-facts { grid-column: 1 / -1; margin-top: 6px; gap: 0; border-top: 1px solid var(--line); }
.developer-edition .hero-facts span { border: 0; border-right: 1px solid var(--line); border-radius: 0; padding: 28px; background: transparent; }
.developer-edition .hero-facts span:first-child { padding-left: 0; }
.developer-edition .hero-facts span:last-child { border-right: 0; }
.developer-edition .hero-facts b { color: var(--echo-ink); font-family: var(--echo-font-mono); font-size: 32px; font-weight: 400; }
.developer-edition .hero-facts small { color: var(--muted); font-size: 10px; }
.developer-edition .section-head h2 { font-weight: 450; font-size: clamp(30px, 3.7vw, 46px); letter-spacing: -.04em; }
.developer-edition :is(.code-block, .play-result, .tier-card, .table-wrap) { border-radius: var(--echo-radius-md); background: var(--panel); border-color: var(--line); }
.developer-edition :is(.code-top, .result-top) { background: var(--echo-surface); color: var(--dim); border-color: var(--line); font-size: 10px; }
.developer-edition .copy-btn { border-radius: var(--echo-radius-sm); min-height: 36px; }
.developer-edition :is(pre, pre code) { color: var(--echo-ink); font-size: 12px; line-height: 1.8; }
.developer-edition .tier-card { padding: 30px 24px; border-top: 2px solid var(--line-strong); }
.developer-edition .tier-public { border-top-color: var(--accent); }
.developer-edition .tier-index { color: var(--echo-ink-muted); font: 500 11px var(--mono); letter-spacing: .08em; }
.developer-edition .tier-card h3 { color: var(--text); font-weight: 500; font-size: 23px; }
.developer-edition .tier-card p { color: var(--muted); font-size: 13px; }
.developer-edition .tier-card code { color: var(--muted); background: var(--echo-surface-sunken); border-color: var(--line); border-radius: var(--echo-radius-xs); overflow-wrap: anywhere; }
.developer-edition .note { background: var(--echo-surface); border-radius: var(--echo-radius-md); }
.developer-edition :is(input, select) { min-height: 48px; background: var(--echo-surface-sunken); border-color: var(--line-strong); border-radius: var(--echo-radius-sm); color: var(--text); font-size: 13px; }
.developer-edition .filter-label { color: var(--muted); font-size: 12px; }
.developer-edition .endpoint-table th { color: var(--dim); background: var(--echo-surface); font-size: 11px; }
.developer-edition .endpoint-table td { padding-block: 18px; color: var(--muted); font-size: 12px; border-color: var(--line); }
.developer-edition .endpoint-table td code { color: var(--text); font-size: 12px; }
.developer-edition .endpoint-table .method { color: var(--echo-core); background: var(--echo-core-soft); border-color: transparent; border-radius: var(--echo-radius-xs); }
.developer-edition .send-btn { min-height: 48px; color: var(--echo-on-action); background: var(--echo-action); border: 1px solid var(--echo-action); border-radius: var(--echo-radius-sm); font-size: 12px; font-weight: 500; }
.developer-edition .send-btn:hover { background: var(--echo-action); opacity: .88; }
.developer-edition .result-status { color: var(--muted); }
.developer-edition .result-status.ok { color: var(--accent); }
.developer-edition .result-status.err { color: var(--echo-breach); }
.developer-edition .limit-list li { border-color: var(--line); }
.developer-edition .limit-list b { color: var(--text); }
.developer-edition .spec-link { border-radius: var(--echo-radius-md); background: var(--panel); border-color: var(--line); color: var(--muted); padding: 22px; }
.developer-edition .spec-link b { color: var(--accent); }
.developer-edition .dev-footer { color: var(--dim); }

/* Canon review */
.review-edition :is(.topbar, main, footer) { width: min(1280px, calc(100% - var(--gutter) * 2)); }
.review-edition .topbar { height: 82px; }
.review-edition .brand { gap: 14px; letter-spacing: normal; }
.review-edition .brand-desk { color: var(--echo-ink-muted); font-size: 12px; letter-spacing: .04em; }
.review-edition main { padding: 66px 0 80px; }
.review-edition .intro { max-width: none; display: grid; grid-template-columns: 1.3fr .7fr; gap: 80px; align-items: center; margin-bottom: 60px; }
.review-wordmark { margin: 27px 0; font-family: var(--echo-font-display); font-size: clamp(28px, 3.2vw, 46px); font-weight: 400; line-height: 1.16; letter-spacing: .02em; }
.review-wordmark em { color: var(--echo-ink-muted); font-style: normal; }
.review-edition h1 { font-size: clamp(24px, 2.3vw, 33px); font-weight: 400; line-height: 1.5; letter-spacing: -.03em; }
.review-intro-copy > p:last-child { color: var(--muted); max-width: 600px; font-size: 14px; line-height: 1.9; }
.canon-seal { border: 1px solid var(--line); border-radius: var(--echo-radius-lg); background: var(--echo-surface); padding: 22px; }
.seal-geometry { position: relative; height: 230px; display: grid; place-items: center; }
.seal-geometry i { position: absolute; width: 154px; height: 154px; border: 1px solid var(--line-strong); transform: rotate(45deg); }
.seal-geometry i:nth-child(2) { width: 176px; height: 176px; border-color: var(--echo-line-strong); border-radius: 50%; }
/* The seal's C is the ECHO frame without its core, exactly as the brand defines the letter. */
.seal-geometry strong { position: relative; width: 84px; color: var(--echo-ink); line-height: 0; }
.seal-geometry strong .echo-mark { width: 100%; height: auto; }
.seal-geometry > span { position: absolute; bottom: 1px; color: var(--dim); font: 8px var(--mono); letter-spacing: .2em; }
.seal-steps { list-style: none; padding: 0; margin: 24px 0 0; }
.seal-steps li { display: flex; align-items: center; gap: 18px; padding: 14px 3px; border-top: 1px solid var(--line); font-size: 11px; }
.seal-steps span { color: var(--echo-ink-muted); font: 500 11px var(--mono); letter-spacing: .08em; }
.seal-steps b { font-weight: 400; color: var(--muted); }
.review-edition :is(.login-card, .workspace) { border-radius: var(--echo-radius-lg); border-color: var(--line); background: var(--panel); box-shadow: none; backdrop-filter: none; }
.review-edition .candidate-card { background: var(--echo-surface-raised); padding: 28px; }
.review-edition .login-card { padding: 38px; gap: 70px; }
.review-edition .step { font: 500 12px var(--mono); letter-spacing: .08em; color: var(--echo-ink-muted); }
.review-edition .login-card h2 { font-size: 28px; margin-top: 18px; }
.review-edition .login-card p { font-size: 13px; max-width: 440px; }
.review-edition :is(input, textarea) { background: var(--echo-surface-sunken); border-color: var(--line-strong); border-radius: var(--echo-radius-sm); color: var(--text); }
.review-edition input { height: 52px; }
.review-edition :is(.primary, .quiet, .action) { border-radius: var(--echo-radius-sm); }
.review-edition .primary { background: var(--echo-action); color: var(--echo-on-action); height: 48px; border-color: var(--echo-action); font-size: 13px; font-weight: 500; }
.review-edition .primary:hover { opacity: .88; }
.review-edition .quiet:hover { color: var(--echo-ink); border-color: var(--line-strong); background: var(--echo-line); }
.review-edition .workspace { padding: 32px; }
.review-edition .candidate-card { background: var(--echo-surface); padding: 28px; }
.review-edition .metric { border: 1px solid var(--line); border-radius: var(--echo-radius-md); background: var(--echo-surface); padding: 16px; }
.review-edition .metric b { color: var(--echo-ink); font-family: var(--echo-font-mono); font-weight: 400; }
.review-edition .action { min-height: 44px; padding-inline: 18px; }
.review-edition .action:disabled { opacity: .4; cursor: not-allowed; }
.review-edition .badge { border-radius: var(--echo-radius-xs); }
.review-edition footer { font: 500 11px var(--echo-font-telemetry); letter-spacing: .08em; }

/* ECHO family telemetry role: IDs, coordinates, codes and routes in mono uppercase at 0.08em. */
.echo-interior :is(.archive-coordinate, .novel-path, .chapter-number, .chapter-copy small, .observatory-top, .observatory-bottom, .api-orbit > span, .api-nodes, .api-route span, .seal-geometry > span, .reader-title small, .reader-rail > a, .reader-breadcrumb, .chapter-illustration-index, .reader-frontispiece figcaption, .novel-cover header, .novel-cover footer, .cover-title small, .novel-metadata b) { font-family: var(--echo-font-telemetry); font-weight: 500; letter-spacing: .08em; text-transform: uppercase; }
@media (max-width: 1100px) {
  .archive-edition .novel-cover { width: 340px; }
  .archive-edition .novel-cover-stage { min-height: 505px; }
  .archive-edition .novel-hero { min-height: 780px; }
  .archive-edition .chapter-live { padding-left: 192px; grid-template-columns: 55px 1fr 160px; }
  .chapter-thumbnail { width: 142px; }
  .reader-edition .reader-shell { grid-template-columns: 135px minmax(0, 730px); gap: 36px; }
  .reader-edition .reader-margin { display: none; }
  .developer-edition .dev-hero { gap: 34px; }
  .review-edition .intro { gap: 40px; }
}
/* The novel catalogue keeps its section nav on narrow screens, like developers: brand + actions on
   top, the three section links on a second row that scrolls sideways if it ever has to. From 900px
   down this replaces the fixed bar universe/styles.css gives the universe page. */
@media (max-width: 900px) {
  .echo-interior.archive-edition .novel-header { grid-template-columns: minmax(0, 1fr) auto; row-gap: 0; height: auto; padding-top: 8px; }
  .archive-edition .novel-header .universe-nav { position: static; grid-row: 2; grid-column: 1 / -1; height: auto; margin-left: -10px; padding: 0; justify-content: flex-start; gap: 6px; overflow-x: auto; scrollbar-width: none; background: none; border-block: 0; }
  .archive-edition .novel-header .universe-nav::-webkit-scrollbar { display: none; }
  .archive-edition .novel-header .universe-nav a { flex: none; min-width: 44px; padding-inline: 10px; justify-content: center; }
  .archive-edition .novel-header .universe-nav a:focus-visible { outline-offset: -4px; }
  .archive-edition section[id] { scroll-margin-top: 122px; }
}
@media (max-width: 800px) {
  .echo-interior :is(.novel-header, .dev-header) { height: 74px; }
  /* Developers keeps its section nav on phones: brand + actions on top, the section links on a
     second row that scrolls sideways. The hero and section anchors clear the taller header. */
  .developer-edition .dev-header { grid-template-columns: minmax(0, 1fr) auto; row-gap: 2px; height: auto; padding-top: 8px; }
  .developer-edition .dev-nav { grid-row: 2; grid-column: 1 / -1; justify-content: flex-start; gap: 22px; overflow-x: auto; scrollbar-width: none; }
  .developer-edition .dev-nav::-webkit-scrollbar { display: none; }
  .developer-edition .dev-nav a { flex: none; }
  .developer-edition .dev-nav a::after { bottom: 9px; }
  .developer-edition .dev-nav a:focus-visible { outline-offset: -4px; }
  .developer-edition section[id] { scroll-margin-top: 122px; }
  .archive-edition .novel-hero { padding: 162px 0 56px; }
  .archive-coordinate { top: 114px; font-size: 8px; }
  .archive-coordinate span:nth-child(2) { display: none; }
  .archive-edition .novel-hero-grid { grid-template-columns: 1fr; gap: 40px; }
  .archive-edition .novel-hero-copy h1 span { font-size: clamp(42px, 9vw, 64px); }
  .archive-edition .novel-path { margin-bottom: 28px; }
  .archive-edition .novel-cover-stage { min-height: 540px; width: min(100%, 460px); margin-inline: auto; }
  .archive-edition .novel-cover { width: 360px; }
  .archive-edition .cover-caption { bottom: 3%; left: 0; }
  .archive-edition .status-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .archive-edition .status-grid article { border-bottom: 1px solid var(--line); }
  .archive-edition .status-grid article:nth-child(2n) { border-right: 0; }
  .archive-edition .chapter-row { grid-template-columns: 55px 1fr; gap: 18px; }
  .archive-edition .chapter-live { padding-left: 164px; grid-template-columns: 1fr; gap: 12px; }
  .chapter-thumbnail { width: 116px; }
  .archive-edition .chapter-row .chapter-state { grid-column: 2; }
  .archive-edition .chapter-live .chapter-state { grid-column: 1; }
  .archive-edition .chapter-copy h3 { font-size: 26px; }
  .archive-edition .novel-section-heading { grid-template-columns: 1fr; gap: 24px; }
  .archive-edition .editorial-layout { grid-template-columns: 1fr; gap: 38px; }
  .archive-edition :is(.chapter-section, .editorial-section) { padding-block: 74px; }
  .reader-edition .reader-header { grid-template-columns: 1fr auto; }
  .reader-edition .reader-title { display: none; }
  .reader-edition .reader-shell { display: block; max-width: 760px; padding-top: 110px; }
  .reader-edition .reader-rail { position: static; }
  .reader-edition .reader-rail :is(.rail-index, dl, .rail-spine) { display: none; }
  .reader-edition .reader-breadcrumb { margin-top: 28px; }
  .developer-edition .dev-hero { grid-template-columns: 1fr; padding-top: 149px; gap: 38px; }
  .dev-wordmark { font-size: clamp(34px, 6.5vw, 48px); }
  .developer-edition .lead { max-width: 600px; }
  .api-observatory { max-width: 560px; width: 100%; }
  .developer-edition .hero-facts span { padding: 22px 16px; flex-basis: 100px; }
  .developer-edition .hero-facts b { font-size: 28px; }
  .developer-edition .hero-facts small { font-size: 9px; letter-spacing: .03em; }
  .developer-edition .dev-section { padding-block: 65px; }
  .developer-edition .tier-grid { grid-template-columns: 1fr; }
  .review-edition .intro { grid-template-columns: 1fr; }
  .review-wordmark { font-size: clamp(28px, 6vw, 40px); }
  .review-edition .canon-seal { display: grid; grid-template-columns: 1fr 1fr; align-items: center; gap: 24px; }
  .seal-steps { margin: 0; }
  .review-edition .login-card { grid-template-columns: 1fr; gap: 24px; padding: 30px; }
}
@media (max-width: 520px) {
  .echo-interior { --gutter: 22px; }
  .echo-interior :is(.universe-actions, .dev-actions) { gap: 6px; }
  .echo-interior .back-echo { min-width: 60px; font-size: 9px; padding-inline: 8px; }
  .echo-interior .locale-switch button { min-width: 34px; padding-inline: 4px; }
  .archive-edition .novel-hero-copy h1 span { font-size: clamp(36px, 10vw, 46px); }
  .archive-edition .novel-hero-copy h1 strong { font-size: 28px; }
  .archive-edition .novel-hero-actions { gap: 8px; flex-direction: row; margin-top: 24px; }
  .archive-edition .novel-deck { margin-top: 22px; }
  .archive-edition .novel-hero-copy h1 strong { margin-top: 18px; }
  .archive-edition .novel-hero-actions :is(a, button) { flex: 1; min-width: 0; padding-inline: 16px; }
  .archive-edition .novel-metadata { grid-template-columns: 1fr 1fr; margin-top: 26px; }
  .archive-edition .novel-metadata > span:last-child { display: none; }
  .archive-edition .novel-cover-stage { min-height: 450px; }
  .archive-edition .novel-cover { width: min(86%, 320px); padding: 22px; }
  .archive-edition .archive-rings { width: 400px; }
  .archive-edition .cover-title strong { font-size: 26px; }
  .archive-edition .novel-cover :is(header, footer) { font-size: 7px; }
  .archive-edition .cover-caption { bottom: 0; }
  .archive-edition .status-grid article { padding: 22px 10px; gap: 10px; min-height: 114px; flex-direction: column; align-items: flex-start; }
  .archive-edition .status-grid article > span { font-size: 30px; }
  .archive-edition .status-grid strong { margin-top: 4px; font-size: 10px; }
  .archive-edition .chapter-live { padding: 204px 20px 24px; }
  .chapter-thumbnail { top: 16px; left: 16px; width: calc(100% - 32px); height: 166px; object-position: center 48%; }
  .archive-edition .chapter-row { gap: 14px; }
  .archive-edition .chapter-copy p { font-size: 12px; }
  .archive-edition .resonance-actions { grid-template-columns: 1fr 1fr; }
  .archive-edition .resonance-actions button { padding-inline: 9px; gap: 6px; font-size: 11px; }
  .archive-edition .resonance-split { flex-direction: row; flex-wrap: wrap; }
  .archive-edition .governance-step { grid-template-columns: 20px minmax(0, 1fr); }
  .archive-edition .governance-step > i { grid-column: 2; text-align: left; }
  .archive-edition .editorial-note { grid-template-columns: 1fr; gap: 12px; }
  .reader-edition .reader-header { min-height: 74px; padding-inline: 10px; }
  .reader-edition .reader-back { font-size: 10px; gap: 5px; }
  .reader-edition .reader-actions { gap: 3px; }
  .reader-edition .reader-actions :is(#font-down, #font-up) { display: inline-flex; min-width: 36px; }
  .reader-edition .reader-actions #theme-toggle { min-width: 36px; }
  .reader-edition .reader-actions #theme-toggle span { display: none; }
  .reader-edition .reader-actions .locale-switch button { min-width: 30px; }
  .reader-edition .reader-shell { padding-inline: 22px; }
  .reader-edition .chapter-heading { padding: 48px 0 38px; }
  .reader-edition .chapter-heading h1 span { font-size: 41px; letter-spacing: .08em; }
  .reader-edition .chapter-logline { font-size: 15px; }
  .reader-frontispiece { aspect-ratio: 1.5; }
  .reader-frontispiece figcaption { left: 16px; bottom: 15px; font-size: 8px; }
  .reader-edition .chapter-illustration figcaption { grid-template-columns: 1fr; gap: 9px; }
  .reader-edition .preview-end { padding: 30px 22px; }
  .reader-edition .preview-end h2 { font-size: 27px; }
  .developer-edition .dev-hero { padding-top: 142px; }
  .dev-wordmark { font-size: clamp(26px, 7.4vw, 34px); }
  .api-observatory { padding: 18px; }
  .api-orbit { height: 230px; }
  .api-orbit i:nth-child(2) { width: 225px; }
  .api-nodes { font-size: 7px; }
  .developer-edition .hero-facts { display: grid; grid-template-columns: 1fr 1fr 1fr; }
  .developer-edition .hero-facts span { padding: 18px 10px; }
  .developer-edition .hero-facts b { font-size: 24px; }
  .developer-edition .hero-facts b[data-i18n='factAuthValue'] { font-size: 18px; min-height: 29px; display: flex; align-items: center; }
  .developer-edition .hero-facts small { font-size: 9px; }
  .developer-edition .filter-row { align-items: stretch; }
  .developer-edition #endpoint-filter { width: 100%; min-width: 0; }
  .developer-edition .endpoint-table { min-width: 580px; }
  .developer-edition .table-wrap { overflow-x: auto; }
  .developer-edition .play-controls { flex-direction: column; align-items: stretch; }
  .developer-edition .play-controls select { min-width: 0; width: 100%; }
  .developer-edition .spec-links { grid-template-columns: 1fr; }
  .review-edition main { padding-top: 42px; }
  .review-edition .intro { margin-bottom: 34px; gap: 28px; }
  .review-wordmark { font-size: clamp(24px, 7vw, 30px); }
  .review-edition h1 { font-size: 23px; }
  .review-edition .canon-seal { gap: 20px; padding: 18px; grid-template-columns: 100px 1fr; }
  .seal-geometry { height: 140px; }
  .seal-geometry i { width: 78px; height: 78px; }
  .seal-geometry i:nth-child(2) { width: 94px; height: 94px; }
  .seal-geometry strong { font-size: 44px; }
  .seal-geometry > span { font-size: 5px; letter-spacing: .1em; }
  .seal-steps li { gap: 10px; padding-block: 12px; font-size: 10px; }
  .review-edition :is(.login-card, .workspace) { padding: 24px; }
  .review-edition .login-card h2 { font-size: 24px; }
  .review-edition .candidate-card { padding: 18px; }
  .review-edition .candidate-head { flex-direction: column; }
  .review-edition .metrics { grid-template-columns: 1fr; }
  .review-edition footer { gap: 18px; flex-wrap: wrap; font-size: 9px; }
}
@media (prefers-reduced-motion: reduce) {
  html:has(.echo-interior) { scroll-behavior: auto; }
  .echo-interior *, .echo-interior *::before, .echo-interior *::after { animation: none !important; transition: none !important; scroll-behavior: auto !important; }
}

/* Brand type floor: Chinese never renders below the 12px caption size. */
:root[lang^="zh"] .echo-interior :is(.locale-switch button, .universe-nav a, .dev-nav a, .back-echo, .reader-back b, .quiet) { font-size: 12px; }
/* The language switches name Chinese ("中", "中文") on the English pages too. */
.echo-interior .locale-switch button[data-locale="zh"], .review-edition #lang-toggle { font-size: 12px; }
:root[lang^="zh"] .archive-edition :is(.governance-detail header p, .resonance-actions button span, .resonance-split small, .novel-metadata small, .novel-metadata b[data-i18n], .cover-caption span, .cover-caption b, .status-grid small, .status-grid strong, .chapter-state span, .governance-step p, .governance-step > i, .governance-boundary, .editorial-note p, .novel-footer span) { font-size: 12px; }
:root[lang^="zh"] .reader-edition :is(.reader-rail dt, .reader-rail dd, .candidate-banner p, .chapter-byline span, .chapter-illustration figcaption p, .preview-actions a, .preview-actions button, .chapter-footnote b) { font-size: 12px; }
:root[lang^="zh"] .developer-edition :is(.observatory-bottom span, .hero-facts small, .copy-btn, .tier-card code, .endpoint-table th, .result-status, .dev-footer nav a) { font-size: 12px; }
:root[lang^="zh"] .review-edition :is(.seal-steps b, footer a) { font-size: 12px; }