/* === base/page-contract.css === */
@page {
  size: var(--openpress-page-width) var(--openpress-page-height);
  margin: var(--openpress-page-margin);
}

* {
  box-sizing: border-box;
}

html {
  background: var(--openpress-color-app-bg);
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--openpress-color-text-on-dark);
  background: #1a1a1a;
  font-family: var(--openpress-font-body);
  font-size: var(--openpress-text-md);
  line-height: var(--openpress-leading-body);
  -webkit-print-color-adjust: exact;
  print-color-adjust: exact;
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
}

.reader-app {
  display: grid;
  grid-template-rows: 56px minmax(0, 1fr);
  grid-template-columns: 200px minmax(0, 1fr) 340px;
  grid-template-areas:
    "nav nav nav"
    "left main right";
  min-height: 100vh;
  height: 100vh;
  overflow: hidden;
  transition: grid-template-columns 240ms cubic-bezier(0.22, 0.61, 0.36, 1);
}

button,
.reader-stage {
  outline: none;
}

body.exporting .reader-page,
body.exporting .reader-page.is-active {
  animation: none !important;
  transform: none !important;
  transition: none !important;
}

button:focus,
.reader-stage:focus {
  outline: none;
}

button:focus-visible {
  outline: 1px solid rgba(255, 255, 255, 0.4);
  outline-offset: 2px;
}

.reader-app.is-closed-left {
  grid-template-columns: 0 minmax(0, 1fr) 340px;
}

.reader-app.is-closed-right {
  grid-template-columns: 200px minmax(0, 1fr) 0;
}

.reader-app.is-closed-left.is-closed-right {
  grid-template-columns: 0 minmax(0, 1fr) 0;
}

.reader-app.is-closed-left .reader-thumb-strip,
.reader-app.is-closed-right .reader-side-nav {
  display: none;
}

.reader-navbar {
  grid-area: nav;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  padding: 0 24px;
  gap: 24px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  background: rgba(22, 22, 22, 0.6);
  position: relative;
}

.navbar-section {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
}

.navbar-left {
  justify-self: start;
}

.navbar-right {
  justify-self: end;
}

.navbar-brand {
  display: flex;
  align-items: baseline;
  gap: 14px;
  color: var(--openpress-color-text-on-dark);
  min-width: 0;
}

.navbar-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  padding: 0;
  background: transparent;
  border: 0;
  color: var(--openpress-color-text-placeholder);
  font-size: 16px;
  line-height: 1;
  cursor: pointer;
  opacity: 0.6;
  transition: opacity 150ms ease, color 150ms ease;
}

.navbar-icon:hover {
  opacity: 1;
  color: var(--openpress-color-text-on-dark);
}

.navbar-icon[aria-pressed="false"] {
  opacity: 0.35;
}

.navbar-hints {
  justify-self: center;
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--openpress-color-text-placeholder);
  font-size: 11px;
  letter-spacing: 0.1em;
  opacity: 0.7;
}

.navbar-hints .navbar-sep {
  color: var(--openpress-color-border-strong);
}

.navbar-icon-hamburger {
  flex-direction: column;
  gap: 4px;
  width: 36px;
  height: 36px;
}

.navbar-icon-hamburger span {
  display: block;
  width: 16px;
  height: 1px;
  background: currentColor;
  transition: transform 180ms ease, opacity 180ms ease;
}

.navbar-icon-hamburger[aria-pressed="true"] span:nth-child(1) {
  transform: translateY(0);
}

.navbar-icon-hamburger[aria-pressed="false"] span {
  opacity: 0.6;
}


.navbar-mark {
  font-family: var(--openpress-font-serif);
  font-size: 18px;
  font-weight: 400;
  letter-spacing: 0.02em;
}

.navbar-sub {
  font-size: 11px;
  color: var(--openpress-color-text-placeholder);
  letter-spacing: 0.1em;
}

.navbar-actions {
  display: flex;
  gap: 8px;
  justify-self: end;
}

.navbar-btn {
  height: 32px;
  padding: 0 14px;
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.18);
  color: var(--openpress-color-text-secondary);
  font-family: inherit;
  font-size: 11px;
  letter-spacing: 0.1em;
  cursor: pointer;
  transition: border-color 150ms, color 150ms;
}

.navbar-btn:hover {
  border-color: rgba(255, 255, 255, 0.45);
  color: var(--openpress-color-text-on-dark);
}

.navbar-menu-btn {
  display: none;
  width: 36px;
  height: 36px;
  background: transparent;
  border: 0;
  color: var(--openpress-color-text-secondary);
  font-family: inherit;
  font-size: 22px;
  line-height: 1;
  cursor: pointer;
  padding: 0;
  letter-spacing: 0.08em;
}

.navbar-menu-btn:hover {
  color: var(--openpress-color-text-on-dark);
}

.mobile-menu {
  position: fixed;
  inset: 0;
  z-index: 30;
  display: flex;
  align-items: flex-end;
  animation: mobile-menu-in 180ms ease-out both;
}

.mobile-menu[hidden] {
  display: none;
}

@keyframes mobile-menu-in {
  from { opacity: 0; }
  to { opacity: 1; }
}

.mobile-menu-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(15, 15, 15, 0.55);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
}

.mobile-menu-sheet {
  position: relative;
  z-index: 1;
  width: 100%;
  padding: 14px;
  padding-bottom: calc(14px + env(safe-area-inset-bottom));
  display: flex;
  flex-direction: column;
  gap: 8px;
  animation: mobile-menu-sheet-in 220ms cubic-bezier(0.22, 0.61, 0.36, 1) both;
}

@keyframes mobile-menu-sheet-in {
  from { transform: translateY(12px); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}

.mobile-menu-item,
.mobile-menu-cancel {
  width: 100%;
  height: 54px;
  font-family: inherit;
  font-size: 15px;
  letter-spacing: 0.06em;
  color: var(--openpress-color-text-on-dark);
  cursor: pointer;
  padding: 0;
}

.mobile-menu-item {
  background: rgba(40, 40, 40, 0.85);
  -webkit-backdrop-filter: blur(20px);
  backdrop-filter: blur(20px);
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.mobile-menu-item:active {
  background: rgba(60, 60, 60, 0.92);
}

.mobile-menu-cancel {
  margin-top: 4px;
  background: rgba(70, 70, 70, 0.88);
  -webkit-backdrop-filter: blur(20px);
  backdrop-filter: blur(20px);
  border: 0;
  letter-spacing: 0.08em;
  font-weight: 500;
}

.reader-stage {
  grid-area: main;
  min-width: 0;
  min-height: 0;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  overflow: auto;
  overscroll-behavior: contain;
  scroll-behavior: smooth;
  container-type: inline-size;
  scrollbar-width: thin;
  scrollbar-color: rgba(255, 255, 255, 0.18) transparent;
}

.reader-stage::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

.reader-stage::-webkit-scrollbar-track {
  background: transparent;
}

.reader-stage::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.15);
  border-radius: 0;
  border: 2px solid transparent;
  background-clip: padding-box;
}

.reader-stage::-webkit-scrollbar-thumb:hover {
  background: rgba(255, 255, 255, 0.28);
  background-clip: padding-box;
  border: 2px solid transparent;
}

.reader-stage::-webkit-scrollbar-corner {
  background: transparent;
}

.reader-pages {
  min-height: 0;
  width: 100%;
  height: auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 28px;
  padding: 32px 24px 48px;
  --reader-page-width: var(--openpress-page-width);
}

.reader-pages.is-spread {
  --reader-page-width: var(--openpress-page-width);
}

.reader-spread {
  display: grid;
  grid-template-columns: minmax(0, var(--reader-page-width));
  justify-content: center;
  gap: 28px;
  width: 100%;
}

.reader-spread.has-two {
  grid-template-columns: repeat(2, minmax(0, var(--reader-page-width)));
}

.reader-page {
  display: none;
  position: relative;
  width: var(--reader-page-width, var(--openpress-page-width));
  height: var(--openpress-page-height);
  --page-margin-x: clamp(28px, 5cqw, 48px);
  --page-margin-top: clamp(28px, 5cqw, 48px);
  --page-margin-bottom: clamp(18px, 3cqw, 28px);
  --page-header-height: clamp(12px, 1.9cqw, 20px);
  --page-footer-height: clamp(18px, 2.6cqw, 26px);
  --page-frame-gap: clamp(8px, 1.4cqw, 14px);
  overflow: hidden;
  color: var(--openpress-color-ink);
  background: var(--openpress-color-document);
  container-type: inline-size;
  box-shadow: 0 18px 44px rgba(0, 0, 0, 0.22);
}

.reader-app.is-ready .reader-page,
.reader-page.measurement {
  display: block;
}

.page-frame {
  width: 100%;
  height: 100%;
  min-height: inherit;
  display: grid;
  grid-template-rows: var(--page-header-height) minmax(0, 1fr) var(--page-footer-height);
  row-gap: var(--page-frame-gap);
  padding: var(--page-margin-top) var(--page-margin-x) var(--page-margin-bottom);
  background: var(--openpress-color-document);
}

.reader-page.no-footer .page-frame {
  grid-template-rows: var(--page-header-height) minmax(0, 1fr);
}

.reader-page.no-footer .page-footer {
  display: none;
}

.page-header,
.page-footer {
  min-width: 0;
  overflow: hidden;
}

.page-header {
  display: flex;
  align-items: flex-start;
  color: var(--openpress-color-muted);
  font-size: clamp(7pt, 1.2cqw, 8pt);
  letter-spacing: 0.1em;
  opacity: 0.62;
  pointer-events: none;
}

.page-body {
  min-width: 0;
  min-height: 0;
  overflow: visible;
}

.page-footer {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
  font-size: clamp(7pt, 1.25cqw, 8pt);
  color: var(--openpress-color-muted);
  letter-spacing: 0.1em;
  opacity: 0.7;
  pointer-events: none;
}

.page-footer .footer-left {
  flex: 1;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.page-footer .footer-right {
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.14em;
  flex-shrink: 0;
}

.reader-page.measurement {
  display: block !important;
  position: absolute;
  left: -99999px;
  top: 0;
  visibility: hidden;
  box-shadow: none;
  outline: 0;
  transform: none !important;
}

.reader-page.is-active.page-in-forward {
  animation: page-in-fwd 280ms cubic-bezier(0.33, 1, 0.68, 1) both;
}

.reader-page.is-active.page-in-backward {
  animation: page-in-bwd 280ms cubic-bezier(0.33, 1, 0.68, 1) both;
}

@keyframes page-in-fwd {
  0% { opacity: 0; transform: translateX(10px); }
  100% { opacity: 1; transform: translateX(0); }
}

@keyframes page-in-bwd {
  0% { opacity: 0; transform: translateX(-10px); }
  100% { opacity: 1; transform: translateX(0); }
}

/* === base/typography.css === */
/* Page-surface styles (cover, back-cover, toc) live in
 * document/theme/page-surfaces/. */

.reader-page--content {
  padding: 0;
}

.content-body {
  background: var(--openpress-color-document);
}

h2,
h3,
h4 {
  break-after: avoid;
  color: var(--openpress-color-ink);
  letter-spacing: 0.04em;
}

h2 {
  margin: 0 0 var(--openpress-space-4);
  padding: 0;
  font-family: var(--openpress-font-serif);
  font-size: clamp(5.7pt, 3.4cqw, 17pt);
  line-height: 1.45;
  font-weight: 300;
  border: 0;
}

h2::before {
  content: "";
  display: block;
  width: 36px;
  height: 1px;
  background: var(--openpress-color-ink);
  margin-bottom: var(--openpress-space-4);
}

.reader-page--content h2[data-chapter] {
  display: flex;
  align-items: baseline;
  gap: 0.55em;
  margin: 0 0 var(--openpress-space-4);
}

.reader-page--content h2[data-chapter]::before {
  content: attr(data-chapter);
  display: inline-block;
  flex-shrink: 0;
  font-family: var(--openpress-font-serif);
  font-size: 1.55em;
  font-weight: 300;
  color: var(--openpress-color-muted);
  line-height: 1;
  letter-spacing: 0.06em;
  width: auto;
  min-width: 0;
  height: auto;
  background: transparent;
  padding: 0;
  margin: 0;
  border: 0;
}

.reader-page--content h3[data-section] {
  display: flex;
  align-items: baseline;
  gap: 0.55em;
}

.reader-page--content h3[data-section]::before {
  content: attr(data-section);
  flex-shrink: 0;
  font-family: var(--openpress-font-serif);
  font-size: 0.95em;
  font-weight: 300;
  color: var(--openpress-color-muted);
  letter-spacing: 0.08em;
  line-height: inherit;
}

h2 + p,
h2 + h3 {
  margin-top: var(--openpress-space-3);
}

h3 {
  margin: var(--openpress-space-3) 0 var(--openpress-space-2);
  font-family: var(--openpress-font-serif);
  font-size: clamp(4.8pt, 2.4cqw, 13pt);
  line-height: 1.55;
  font-weight: 400;
  color: var(--openpress-color-ink);
  letter-spacing: 0.03em;
}

.reader-page--content .page-body > h3:first-child {
  margin-top: 0;
}

h4 {
  margin: var(--openpress-space-3) 0 var(--openpress-space-1);
  font-family: var(--openpress-font-body);
  font-size: clamp(4.4pt, 1.9cqw, 11pt);
  font-weight: 500;
  color: var(--openpress-color-muted);
  letter-spacing: 0.04em;
}

p {
  margin: 0 0 var(--openpress-space-2);
  font-size: clamp(4.2pt, 1.85cqw, 10.5pt);
  line-height: 1.85;
}

.reader-page--content p,
.reader-page--content li,
.reader-page--content td {
  hanging-punctuation: first allow-end;
}

.reader-page--content.is-chapter-end .page-body::after {
  content: "―";
  display: block;
  text-align: center;
  margin-top: var(--openpress-space-1);
  color: var(--openpress-color-muted);
  font-size: 1em;
  letter-spacing: 0.4em;
  opacity: 0.45;
}

strong {
  font-weight: 600;
  color: var(--openpress-color-ink);
}

em {
  font-style: italic;
  font-family: var(--openpress-font-serif);
  color: var(--openpress-color-ink);
}

del,
s {
  color: var(--openpress-color-muted);
  text-decoration-thickness: 1px;
  text-decoration-color: var(--openpress-color-muted);
}

mark {
  background: var(--openpress-chart-gold-bg);
  color: var(--openpress-color-ink);
  padding: 0 0.15em;
  border-radius: 1px;
}

a {
  color: var(--openpress-color-ink);
  text-decoration-line: underline;
  text-decoration-style: dotted;
  text-decoration-color: var(--openpress-color-muted);
  text-underline-offset: 2px;
}

/* Inline 語意強調 — 受控 status 色票
 * Markdown 內用 <span class="status-warn|status-success|status-info">。
 * 不提供 .accent-<color>（按色相命名）以避免破壞語意系統。
 */
.status-warn {
  color: var(--openpress-status-warn);
  font-weight: 600;
}

.status-success {
  color: var(--openpress-status-success);
  font-weight: 600;
}

.status-info {
  color: var(--openpress-status-info);
  font-weight: 600;
}

.text-muted {
  color: var(--openpress-color-muted);
}

figcaption,
caption {
  margin-top: 2mm;
  color: var(--openpress-color-muted);
  font-size: clamp(3.8pt, 1.45cqw, 8.5pt);
  line-height: 1.5;
  letter-spacing: 0.02em;
  text-align: center;
}

caption {
  caption-side: bottom;
  margin: var(--openpress-space-1) 0 0;
  text-align: center;
}

ol,
ul {
  margin: 0 0 var(--openpress-space-3);
  padding-left: 7mm;
  font-size: clamp(4.2pt, 1.85cqw, 10.5pt);
  line-height: 1.85;
}

ol {
  list-style: decimal outside;
}

ul {
  list-style: disc outside;
}

li {
  margin: 0 0 1.4mm;
  padding-left: 1mm;
}

figure {
  break-inside: avoid;
  margin: var(--openpress-space-4) 0 var(--openpress-space-2);
}

figure img {
  display: block;
  max-width: 100%;
  max-height: 135mm;
  margin: 0 auto;
  padding: 6px;
  border: 1px solid var(--openpress-color-line);
  background: #ffffff;
  box-sizing: border-box;
}

.reader-page--content .page-body > figure {
  width: min(86%, 150mm);
  margin-left: auto;
  margin-right: auto;
}

.reader-page--content .page-body > figure img {
  width: 100%;
  max-height: 92mm;
  object-fit: contain;
}

table {
  width: 100%;
  margin: var(--openpress-space-3) 0 var(--openpress-space-4);
  border-collapse: collapse;
  border: 0;
  border-top: 1px solid var(--openpress-color-ink);
  background: transparent;
  font-size: clamp(3.5pt, 1.55cqw, 9pt);
  line-height: var(--openpress-leading-table);
  break-inside: avoid;
}

thead {
  display: table-header-group;
}

th,
td {
  padding: 3.4mm 2.4mm;
  border: 0;
  border-bottom: 1px solid var(--openpress-color-line);
  vertical-align: top;
  min-width: 0;
  overflow-wrap: anywhere;
  word-break: normal;
}

th {
  color: var(--openpress-color-ink);
  background: transparent;
  border-bottom: 1px solid var(--openpress-color-ink);
  text-align: left;
  font-weight: 500;
  letter-spacing: 0.02em;
  white-space: nowrap;
}

.reader-page--content tbody tr:nth-child(even) td {
  background: #fafafa;
}

.reader-page--content table:not(.figure-grid) tbody tr:last-child td {
  border-bottom: 1px solid var(--openpress-color-ink);
}

code {
  font-family: var(--openpress-font-mono);
  font-size: 0.92em;
  padding: 0.05em 0.25em;
  background: rgba(0, 0, 0, 0.04);
  border-radius: 2px;
  overflow-wrap: anywhere;
  word-break: normal;
}

pre {
  max-width: 100%;
  margin: var(--openpress-space-2) 0 var(--openpress-space-3);
  padding: 2.6mm 3.2mm;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
  word-break: normal;
  background: #f7f7f4;
  border: 0;
  border-top: 1px solid var(--openpress-color-line);
  border-bottom: 1px solid var(--openpress-color-line);
}

pre code {
  display: block;
  padding: 0;
  background: transparent;
  border-radius: 0;
  font-size: clamp(4pt, 1.65cqw, 9.2pt);
  line-height: 1.65;
  color: #262626;
}

hr {
  margin: var(--openpress-space-4) 0;
  border: 0;
  border-top: 1px solid var(--openpress-color-line);
}

/* === page-surfaces/cover.css === */
/* page-surfaces / cover
 * Cover and back-cover share most of their layout chrome (meta header, byline
 * footer, central main column). Shared selectors live here so cover is the
 * primary reference; back-cover.css only refines the parts that differ.
 */

.reader-page--cover,
.reader-page--back-cover {
  background: var(--openpress-color-document);
  padding: clamp(28px, 5cqw, 48px) clamp(24px, 4.5cqw, 42px);
  flex-direction: column;
  justify-content: space-between;
  gap: clamp(16px, 2.5cqw, 24px);
}

.reader-app.is-ready .reader-page--cover,
.reader-app.is-ready .reader-page--back-cover,
.reader-page--cover.is-active,
.reader-page--back-cover.is-active {
  display: flex;
}

.cover-meta,
.back-cover-meta {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: var(--openpress-space-3);
  padding-bottom: var(--openpress-space-2);
  border-bottom: 1px solid var(--openpress-color-ink);
  font-family: var(--openpress-font-body);
  font-size: clamp(8pt, 1.25cqw, 9.5pt);
  color: var(--openpress-color-muted);
  letter-spacing: 0.12em;
  flex-shrink: 0;
}

.mihua-logo,
.openpress-logo {
  display: block;
  width: clamp(112px, 18cqw, 154px);
  height: auto;
  flex-shrink: 0;
  object-fit: contain;
}

.cover-meta-title {
  margin-left: auto;
  max-width: 48%;
  padding-top: 0.35em;
  text-align: right;
  white-space: nowrap;
}

.cover-main,
.back-cover-main {
  display: flex;
  flex-direction: column;
  flex: 1;
  min-height: 0;
}

.cover-title {
  margin: 0;
  font-family: var(--openpress-font-serif);
  font-size: clamp(36px, 8.5cqw, 64px);
  font-weight: 300;
  line-height: 1;
  letter-spacing: 0.01em;
  color: var(--openpress-color-ink);
}

.cover-tagline {
  margin: var(--openpress-space-2) 0 0;
  font-family: var(--openpress-font-serif);
  font-size: clamp(14px, 2.4cqw, 20px);
  font-weight: 300;
  letter-spacing: 0.08em;
  color: var(--openpress-color-muted);
}

.cover-rule,
.back-cover-rule {
  height: 1px;
  width: 40px;
  background: var(--openpress-color-ink);
  margin: var(--openpress-space-3) 0;
}

.cover-subtitle {
  margin: 0;
  font-family: var(--openpress-font-body);
  font-size: clamp(10.5pt, 1.85cqw, 12.5pt);
  font-weight: 400;
  letter-spacing: 0.02em;
  line-height: 1.55;
  color: var(--openpress-color-ink);
}

.cover-summary {
  margin: var(--openpress-space-2) 0 0;
  font-family: var(--openpress-font-body);
  font-size: clamp(9pt, 1.65cqw, 10pt);
  line-height: 1.8;
  color: var(--openpress-color-muted);
  max-width: 90%;
}

.cover-visual,
.back-cover-visual {
  margin: var(--openpress-space-3) 0 0;
  flex-shrink: 0;
}

.cover-visual img,
.back-cover-visual img {
  display: block;
  width: 100%;
  height: auto;
  max-height: 22cqh;
  object-fit: cover;
  border: 0;
  padding: 0;
  background: transparent;
}

.cover-byline,
.back-cover-byline {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding-top: var(--openpress-space-2);
  border-top: 1px solid var(--openpress-color-ink);
  font-family: var(--openpress-font-body);
  font-size: clamp(8pt, 1.25cqw, 9.5pt);
  color: var(--openpress-color-muted);
  letter-spacing: 0.12em;
  flex-shrink: 0;
}

.cover-byline span:first-child,
.back-cover-byline span:first-child {
  font-family: var(--openpress-font-serif);
  font-weight: 400;
  letter-spacing: 0.04em;
  color: var(--openpress-color-ink);
}

/* === page-surfaces/chapter-opener.css === */
/* page-surfaces / chapter-opener
 * Optional H2-level divider for book-like documents. Formal reports can omit
 * the `kind: chapter-opener` source page and this surface will not appear.
 */

.reader-page--chapter-opener {
  position: relative;
  overflow: hidden;
  background:
    linear-gradient(90deg, rgba(31, 35, 40, 0.08), transparent 42%),
    var(--openpress-color-document);
}

.reader-page--chapter-opener:has(.chapter-opener-illustration) {
  --chapter-opener-bg: #6f9f8a;
  --chapter-opener-ink: #101211;
  --chapter-opener-title: #101211;
  --chapter-opener-paper: var(--openpress-color-document);
  background: var(--chapter-opener-bg);
}

.reader-page--chapter-opener:has(.chapter-opener-tone--sage) {
  --chapter-opener-bg: #6f9f8a;
  --chapter-opener-title: #101211;
  --chapter-opener-paper: var(--openpress-color-document);
}

.reader-page--chapter-opener:has(.chapter-opener-tone--lavender) {
  --chapter-opener-bg: #8680bf;
  --chapter-opener-title: #101211;
  --chapter-opener-paper: var(--openpress-color-document);
}

.reader-page--chapter-opener:has(.chapter-opener-tone--mint) {
  --chapter-opener-bg: #bfd4cd;
  --chapter-opener-title: #101211;
  --chapter-opener-paper: var(--openpress-color-document);
}

.reader-page--chapter-opener:has(.chapter-opener-tone--amber) {
  --chapter-opener-bg: #d7b56d;
  --chapter-opener-title: #101211;
  --chapter-opener-paper: var(--openpress-color-document);
}

.reader-page--chapter-opener::before {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: 5mm;
  background: color-mix(in srgb, var(--openpress-color-soft-line), transparent 28%);
  border-right: 1px solid var(--openpress-color-line);
}

.reader-page--chapter-opener:has(.chapter-opener-illustration)::before {
  content: none;
}

.reader-page--chapter-opener .page-frame {
  background: transparent;
}

.reader-page--chapter-opener .page-body {
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: clamp(20px, 3.4cqw, 40px);
  width: min(138mm, 84%);
  max-width: none;
  min-height: 0;
  margin-inline: auto;
  padding-bottom: 4mm;
  z-index: 1;
}

.reader-page--chapter-opener:has(.chapter-opener-illustration) .page-body {
  justify-content: flex-end;
  align-items: flex-start;
  width: min(168mm, 86%);
  padding-bottom: 28mm;
  gap: clamp(10px, 1.8cqw, 20px);
  z-index: 2;
}

.reader-page--chapter-opener .page-body::before {
  content: none;
}

.reader-page--chapter-opener:has(.chapter-opener-illustration) .chapter-opener-body {
  display: contents;
}

.chapter-opener-illustration {
  position: absolute;
  top: 22mm;
  right: 14mm;
  width: min(112mm, 54%);
  margin: 0;
  color: var(--chapter-opener-ink, #101211);
  z-index: 1;
}

.chapter-opener-illustration svg {
  display: block;
  width: 100%;
  height: auto;
  overflow: visible;
}

.chapter-opener-illustration__paper {
  fill: var(--chapter-opener-paper, var(--openpress-color-document));
}

.chapter-opener-illustration__stroke,
.chapter-opener-illustration__arrow,
.chapter-opener-illustration__thin {
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.chapter-opener-illustration__stroke,
.chapter-opener-illustration__arrow {
  stroke-width: 14;
}

.chapter-opener-illustration__thin {
  stroke-width: 8;
}

.chapter-opener-illustration__node,
.chapter-opener-illustration__dot {
  fill: currentColor;
}

.chapter-opener-kicker {
  display: none;
}

.reader-page--chapter-opener:has(.chapter-opener-illustration) .chapter-opener-kicker {
  display: inline-flex;
  align-items: center;
  width: fit-content;
  min-height: 8mm;
  margin: 0 0 clamp(4px, 1cqw, 10px);
  padding: 0 7mm;
  border: 1px solid currentColor;
  border-radius: 999px;
  color: var(--chapter-opener-ink, #101211);
  font-size: clamp(10pt, 1.8cqw, 14pt);
  font-weight: 700;
  line-height: 1;
}

.chapter-opener-title {
  max-width: 100%;
  margin: 0;
  color: var(--openpress-color-ink);
  font-family: var(--openpress-font-serif);
  font-size: clamp(36pt, 8.4cqw, 64pt);
  font-weight: 600;
  line-height: 0.98;
}

.reader-page--chapter-opener:has(.chapter-opener-illustration) .chapter-opener-title {
  max-width: 118mm;
  color: var(--chapter-opener-title, var(--openpress-color-ink));
  font-size: clamp(52px, 12.4cqw, 112px);
  line-height: 0.92;
}

.chapter-opener-title::before {
  content: none;
}

.chapter-opener-subtitle {
  max-width: 112mm;
  margin: 0;
  color: var(--openpress-color-ink);
  font-size: clamp(18pt, 3.7cqw, 28pt);
  line-height: 1.35;
}

.reader-page--chapter-opener:has(.chapter-opener-illustration) .chapter-opener-subtitle {
  max-width: 100mm;
  color: var(--chapter-opener-title, var(--openpress-color-ink));
}

.chapter-opener-summary {
  max-width: 108mm;
  margin: 0;
  color: var(--openpress-color-muted);
  font-size: clamp(10pt, 1.6cqw, 12pt);
  line-height: 1.7;
}

.chapter-opener-body > :first-child {
  margin-top: 0;
}

.chapter-opener-body > :last-child {
  margin-bottom: 0;
}

/* === page-surfaces/back-cover.css === */
/* page-surfaces / back-cover
 * Refinements on top of cover.css: back-cover centers its main column and
 * uses a kicker + statement + summary instead of title + tagline + summary.
 */

.back-cover-main {
  justify-content: center;
}

.back-cover-kicker {
  margin: 0;
  font-family: var(--openpress-font-serif);
  font-size: clamp(30px, 6.8cqw, 54px);
  font-weight: 300;
  line-height: 1;
  letter-spacing: 0.01em;
  color: var(--openpress-color-ink);
}

.back-cover-statement {
  margin: 0;
  max-width: 84%;
  font-family: var(--openpress-font-body);
  font-size: clamp(11.5pt, 2.05cqw, 14pt);
  font-weight: 400;
  line-height: 1.6;
  letter-spacing: 0.02em;
  color: var(--openpress-color-ink);
}

.back-cover-summary {
  margin: var(--openpress-space-2) 0 0;
  max-width: 90%;
  font-family: var(--openpress-font-body);
  font-size: clamp(9pt, 1.65cqw, 10pt);
  line-height: 1.8;
  color: var(--openpress-color-muted);
}

.back-cover-visual img {
  max-height: 18cqh;
  opacity: 0.9;
}

/* === page-surfaces/toc.css === */
/* page-surfaces / toc
 * Table-of-contents page surface rendered by the manuscript <Toc> helper.
 * Entries flow through the generated toc:<sourceId> chain and TocArea.
 */

.reader-page--toc {
  padding: 0;
}

.reader-page--toc .page-frame {
  grid-template-rows: auto minmax(0, 1fr);
}

.reader-page--toc .toc-header {
  display: block;
  overflow: visible;
  opacity: 1;
}

.reader-page--toc .openpress-toc-area {
  height: 100%;
}

.reader-page--toc h2 {
  margin-top: 0;
  font-family: var(--openpress-font-serif);
  font-weight: 300;
  letter-spacing: 0.12em;
  font-size: clamp(15pt, 3.6cqw, 18pt);
  border-bottom: 0;
  padding-bottom: 0;
}

.reader-page--toc h2.toc-heading--continuation {
  display: none;
}

.toc-list {
  display: flex;
  flex-direction: column;
  gap: 0.45mm;
  margin: 0;
  padding: 8mm 0 0;
  list-style: none;
}

.toc-continuation .toc-list {
  padding-top: 3mm;
}

.toc-list li {
  border-bottom: 0;
}

.toc-list a {
  display: grid;
  grid-template-columns: 9mm minmax(0, 1fr) 12mm;
  column-gap: 3mm;
  align-items: baseline;
  color: var(--openpress-color-ink);
  text-decoration: none;
  font-family: var(--openpress-font-serif);
  padding: 1.6mm 0;
  font-weight: 400;
  line-height: 1.38;
}

.toc-list a:hover .toc-title {
  color: var(--openpress-color-muted);
}

.toc-index {
  display: inline-block;
  color: var(--openpress-color-muted);
  font-family: var(--openpress-font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 400;
  letter-spacing: 0;
  font-size: 9.5pt;
  text-align: left;
}

.toc-level-2 a {
  margin-top: 2mm;
  padding: 2.4mm 0 1.5mm;
  border-top: 1px solid rgba(169, 180, 194, 0.42);
}

.toc-level-2:first-child a {
  margin-top: 0;
  border-top: 0;
}

.toc-level-2 .toc-title {
  color: var(--openpress-color-ink);
  font-size: 12pt;
  font-weight: 500;
}

.toc-level-2 .toc-title::after {
  content: none;
}

.toc-level-2 .toc-page {
  color: var(--openpress-color-ink);
  font-size: 9.8pt;
}

.toc-level-3 a {
  grid-template-columns: 9mm minmax(0, 1fr) 12mm;
  padding: 1mm 0 1mm 7mm;
  color: var(--openpress-color-muted);
  font-size: 10pt;
}

.toc-level-3 .toc-index {
  font-size: 9pt;
}

.toc-level-3 .toc-page {
  font-size: 9.5pt;
}

.toc-title {
  display: flex;
  gap: 3mm;
  align-items: baseline;
  color: var(--openpress-color-ink);
  font-family: var(--openpress-font-serif);
}

.toc-title::after {
  content: "";
  flex: 1;
  min-width: 10mm;
  border-bottom: 1px dotted rgba(72, 101, 129, 0.32);
  transform: translateY(-0.22em);
}

.toc-page {
  color: var(--openpress-color-muted);
  font-family: var(--openpress-font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 400;
  font-size: 9.8pt;
  justify-self: end;
  min-width: 10mm;
  text-align: right;
}

/* === page-surfaces/workspace-test.css === */
/* Multi-Press workspace test fixtures.
   Two extra Press in press/index.tsx (social-square + slide-16-9) render
   designed placeholders that exercise gallery routing, per-slug export,
   and PNG export. A real social/slide press should ship its own theme;
   this file gives the dogfood enough visual weight to spot regressions.

   Font sizes are absolute px — these pages are fixed canvas (1080² and
   1920×1080), not responsive, so `vw` would shrink type to viewport
   instead of page width. */

.reader-page--social-test {
  --social-paper: #ffffff;
  --social-paper-2: #f7f8f8;
  --social-paper-3: #eff3f8;
  --social-ink: #08090a;
  --social-muted: #6f7378;
  --social-line: rgb(8 9 10 / 10%);
  --social-line-strong: rgb(8 9 10 / 18%);
  --social-accent: #0047ff;
  --social-accent-soft: #eef4ff;
  --social-font-serif: "Noto Serif TC", "Noto Serif CJK TC", "Noto Serif SC", "Songti TC", "Songti SC", serif;
  --social-font-sans: "Noto Sans TC", "Noto Sans CJK TC", system-ui, sans-serif;
  --social-font-mono: "IBM Plex Mono", "SFMono-Regular", "Roboto Mono", ui-monospace, monospace;
  background: var(--social-paper);
  color: var(--social-ink);
}

.reader-page--slide-test {
  --canvas-paper: #fafaf8;
  --canvas-panel: #f0f0ee;
  --canvas-ink: #0a0a0a;
  --canvas-muted: #737373;
  --canvas-accent: #002fa7;
  --canvas-accent-on: #ffffff;
  --canvas-rule: #d4d4d2;
  --canvas-grid: color-mix(in srgb, var(--canvas-ink) 6%, transparent);
  --canvas-font-body: "Inter", "Noto Sans TC", system-ui, sans-serif;
  --canvas-font-display: "Inter", "Noto Sans TC", system-ui, sans-serif;
  --canvas-font-mono: "IBM Plex Mono", "SFMono-Regular", "Roboto Mono", ui-monospace, monospace;
  background: var(--canvas-paper);
  color: var(--canvas-ink);
}

.canvas-test {
  position: relative;
  display: grid;
  grid-template-rows: auto 1fr auto;
  height: 100%;
  width: 100%;
  gap: 24px;
  font-family: var(--canvas-font-body);
  background:
    linear-gradient(90deg, transparent 0 58%, var(--canvas-panel) 58% 100%),
    var(--canvas-paper);
  overflow: hidden;
}

.canvas-test__grid {
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0.45;
  background-image:
    linear-gradient(var(--canvas-grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--canvas-grid) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: linear-gradient(180deg, transparent, black 30%, black 70%, transparent);
}

.canvas-test__header {
  position: relative;
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--canvas-font-mono);
  color: var(--canvas-ink);
}

.canvas-test__mark {
  display: inline-grid;
  place-items: center;
  border-radius: 50%;
  background: var(--canvas-ink);
  color: var(--canvas-paper);
  line-height: 1;
}

.canvas-test__brand {
  font-weight: 600;
}

.canvas-test__body {
  position: relative;
  display: grid;
  align-content: center;
  max-width: 88%;
}

.canvas-test__eyebrow {
  margin: 0;
  font-family: var(--canvas-font-mono);
  letter-spacing: 0;
  text-transform: uppercase;
  color: var(--canvas-accent);
}

.canvas-test__title {
  margin: 0;
  font-family: var(--canvas-font-display);
  line-height: 1.02;
  letter-spacing: 0;
  color: var(--canvas-ink);
}

.canvas-test__lede {
  margin: 0;
  line-height: 1.5;
  color: var(--canvas-muted);
}

.canvas-test__footer {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  font-family: var(--canvas-font-mono);
  color: var(--canvas-muted);
}

.canvas-test__chip {
  display: inline-flex;
  align-items: center;
  border: 1px solid var(--canvas-rule);
  border-radius: 999px;
  background: color-mix(in srgb, var(--canvas-paper) 82%, var(--canvas-ink) 5%);
  color: var(--canvas-ink);
  font-weight: 600;
  letter-spacing: 0;
}

.canvas-test__path code {
  font-family: var(--canvas-font-mono);
  border-radius: 4px;
  border: 1px solid var(--canvas-rule);
  background: color-mix(in srgb, var(--canvas-paper) 72%, transparent);
  color: var(--canvas-muted);
}

/* Square hero: 1080×1080 canvas. Sizes calibrated so the page reads
   well at 100% and is recognizable at gallery-thumb scale (~270px wide). */
.canvas-test--social {
  padding: 80px 90px;
  gap: 36px;
  text-align: center;
  background:
    linear-gradient(90deg, transparent 0 64%, var(--canvas-panel) 64% 100%),
    linear-gradient(180deg, transparent 0 74%, color-mix(in srgb, var(--canvas-accent) 13%, transparent) 74% 100%),
    var(--canvas-paper);
}
.canvas-test--social .canvas-test__header { justify-content: center; font-size: 20px; gap: 14px; }
.canvas-test--social .canvas-test__mark { width: 32px; height: 32px; font-size: 16px; }
.canvas-test--social .canvas-test__body { justify-self: center; gap: 28px; }
.canvas-test--social .canvas-test__eyebrow { font-size: 22px; }
.canvas-test--social .canvas-test__title { font-size: 168px; }
.canvas-test--social .canvas-test__lede { max-width: 22ch; margin: 0 auto; font-size: 28px; }
.canvas-test--social .canvas-test__footer { justify-content: center; font-size: 20px; }
.canvas-test--social .canvas-test__chip { padding: 10px 22px; font-size: 20px; }
.canvas-test--social .canvas-test__path code { padding: 4px 12px; font-size: 18px; }

/* Social card fixture: clean editorial cards. The primitives here do not
   define reusable OpenPress component style; they only skin this dogfood
   Press so social-square output is readable at both page and thumbnail size. */
.social-magazine {
  position: relative;
  display: grid;
  grid-template-rows: auto 1fr auto;
  width: 100%;
  height: 100%;
  overflow: hidden;
  padding: 78px 86px 62px;
  background: var(--social-paper);
  color: var(--social-ink);
  font-family: var(--social-font-serif);
}

.social-magazine__grain {
  display: none;
}

.social-magazine__cover-art {
  display: none;
}

.social-magazine__header,
.social-magazine__content,
.social-magazine__footer {
  position: relative;
  z-index: 2;
}

.social-magazine__header {
  display: flex;
  align-items: center;
  gap: 15px;
  min-height: 36px;
  color: var(--social-muted);
  font-family: var(--social-font-mono);
  font-size: 16px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.social-magazine__issue {
  color: var(--social-ink);
  font-weight: 500;
}

.social-magazine__dot {
  width: 6px;
  height: 6px;
  border-radius: 999px;
  background: var(--social-accent);
}

.social-magazine__content {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  align-content: center;
  gap: 44px;
  min-height: 0;
  padding: 52px 0 54px;
}

.social-magazine__hero {
  display: grid;
  gap: 24px;
  max-width: 740px;
}

.social-magazine__kicker {
  margin: 0;
  color: var(--social-accent);
  font-family: var(--social-font-mono);
  font-size: 17px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.social-magazine__title {
  margin: 0;
  color: var(--social-ink);
  font-family: var(--social-font-serif);
  font-size: 112px;
  font-weight: 500;
  letter-spacing: 0;
  line-height: 1.02;
}

.social-magazine__subtitle {
  margin: 0;
  color: var(--social-muted);
  font-family: var(--social-font-serif);
  font-size: 38px;
  font-style: italic;
  line-height: 1.2;
}

.social-magazine__lede {
  max-width: 27ch;
  margin: 0;
  color: rgb(8 9 10 / 78%);
  font-family: var(--social-font-serif);
  font-size: 28px;
  line-height: 1.55;
}

.social-magazine__footer {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  padding-top: 18px;
  border-top: 1px solid var(--social-line-strong);
  color: var(--social-muted);
  font-family: var(--social-font-mono);
  font-size: 16px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.social-magazine__side-note {
  display: grid;
  justify-self: end;
  align-self: end;
  width: 270px;
  border: 1px solid var(--social-line-strong);
  background: rgb(255 255 255 / 86%);
}

.social-magazine__side-note span {
  display: block;
  padding: 18px 22px;
  border-bottom: 1px solid var(--social-line);
  color: var(--social-ink);
  font-family: var(--social-font-mono);
  font-size: 15px;
  letter-spacing: 0.03em;
  text-transform: uppercase;
}

.social-magazine__side-note span:last-child {
  border-bottom: 0;
}

.social-magazine__ledger {
  display: grid;
  gap: 0;
  max-width: 862px;
  border-top: 1px solid var(--social-line-strong);
}

.social-magazine__ledger-row {
  display: grid;
  grid-template-columns: 68px 138px minmax(0, 1fr);
  align-items: baseline;
  gap: 24px;
  min-height: 108px;
  padding: 24px 0 22px;
  border-bottom: 1px solid var(--social-line);
}

.social-magazine__ledger-row span {
  color: var(--social-accent);
  font-family: var(--social-font-mono);
  font-size: 22px;
  font-weight: 600;
  letter-spacing: 0;
}

.social-magazine__ledger-row strong {
  color: var(--social-ink);
  font-family: var(--social-font-sans);
  font-size: 28px;
  font-weight: 700;
}

.social-magazine__ledger-row p {
  margin: 0;
  color: rgb(8 9 10 / 72%);
  font-family: var(--social-font-sans);
  font-size: 23px;
  line-height: 1.5;
}

.social-magazine__quote {
  max-width: 780px;
  margin: 0;
  padding: 34px 40px 38px;
  border-left: 4px solid var(--social-accent);
  background: var(--social-accent-soft);
}

.social-magazine__quote p {
  margin: 0;
  color: var(--social-ink);
  font-family: var(--social-font-serif);
  font-size: 45px;
  font-style: italic;
  font-weight: 500;
  letter-spacing: 0;
  line-height: 1.36;
}

.social-magazine__notes {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0;
  max-width: 862px;
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--social-line-strong);
  border-left: 1px solid var(--social-line-strong);
}

.social-magazine__notes li {
  display: grid;
  min-height: 112px;
  align-items: end;
  padding: 20px;
  border-right: 1px solid var(--social-line-strong);
  border-bottom: 1px solid var(--social-line-strong);
  color: var(--social-ink);
  font-family: var(--social-font-mono);
  font-size: 18px;
  line-height: 1.35;
  background: rgb(255 255 255 / 72%);
}

.social-magazine--cover .social-magazine__content {
  grid-template-columns: minmax(0, 1fr);
  align-content: start;
  align-items: start;
  padding-top: 54px;
}

.social-magazine--cover .social-magazine__cover-art {
  position: absolute;
  z-index: 1;
  right: 0;
  bottom: 0;
  left: 0;
  display: block;
  height: 560px;
  background-image: url("/openpress/media/social-cover-collage.png");
  background-position: center bottom;
  background-size: cover;
  pointer-events: none;
}

.social-magazine--cover .social-magazine__hero {
  max-width: 588px;
  gap: 17px;
  padding: 34px 38px 38px;
  border: 1px solid var(--social-line-strong);
  background: rgb(255 255 255 / 92%);
}

.social-magazine--cover .social-magazine__title {
  max-width: 9.4ch;
  font-size: 96px;
  line-height: 0.98;
}

.social-magazine--cover .social-magazine__lede {
  max-width: 28ch;
  font-size: 24px;
}

.social-magazine--cover .social-magazine__subtitle {
  font-size: 32px;
}

.social-magazine--cover .social-magazine__side-note {
  position: absolute;
  right: 0;
  bottom: 36px;
  background: rgb(255 255 255 / 84%);
}

.social-magazine--model .social-magazine__content {
  align-content: center;
  gap: 34px;
}

.social-magazine--model .social-magazine__title,
.social-magazine--workflow .social-magazine__title {
  max-width: 9ch;
  font-size: 76px;
  line-height: 1.08;
}

.social-magazine--model .social-magazine__lede {
  max-width: 34ch;
  font-size: 26px;
  font-family: var(--social-font-sans);
}

.social-magazine--workflow .social-magazine__content {
  align-content: center;
  gap: 36px;
}

.social-magazine--workflow .social-magazine__hero {
  max-width: 640px;
}

/* Slide deck fixture: 1920×1080 canvas. The pages intentionally cover
   common deck shapes — cover, agenda, cards, timeline, and closing —
   so slide output does not regress into a single centered hero style. */
.canvas-test--slide {
  padding: 80px 96px 64px;
  gap: 42px;
  text-align: left;
  background: var(--canvas-paper);
}

.canvas-test--slide::before,
.canvas-test--slide::after {
  content: "";
  position: absolute;
  pointer-events: none;
}

.canvas-test--slide::before {
  inset: 0 0 0 68%;
  background: var(--canvas-panel);
}

.canvas-test--slide::after {
  inset: auto 0 0 0;
  height: 178px;
  background: color-mix(in srgb, var(--canvas-panel) 76%, transparent);
}

.canvas-test--slide .canvas-test__grid {
  opacity: 0.36;
  background-image: radial-gradient(var(--canvas-grid) 1.3px, transparent 1.3px);
  background-size: 28px 28px;
  mask-image: none;
}

.canvas-test--slide .canvas-test__header {
  justify-content: space-between;
  font-size: 24px;
  gap: 18px;
  padding-bottom: 22px;
  border-bottom: 1px solid var(--canvas-rule);
}

.canvas-test--slide .canvas-test__mark {
  width: 42px;
  height: 42px;
  border-radius: 0;
  background: var(--canvas-ink);
  color: var(--canvas-paper);
  font-size: 22px;
}

.canvas-test--slide .canvas-test__brand {
  font-weight: 700;
}

.canvas-test--slide .canvas-test__body {
  justify-self: stretch;
  align-content: start;
  gap: 30px;
  max-width: none;
}

.canvas-test--slide .canvas-test__eyebrow {
  color: var(--canvas-accent);
  font-size: 24px;
  font-weight: 700;
  text-transform: uppercase;
}

.canvas-test--slide .canvas-test__title {
  font-size: 112px;
  font-weight: 200;
  line-height: 1.03;
}

.canvas-test--slide .canvas-test__lede {
  max-width: 30ch;
  color: var(--canvas-ink);
  font-size: 34px;
  font-weight: 400;
  line-height: 1.46;
}

.canvas-test--slide .canvas-test__footer {
  justify-content: space-between;
  align-items: end;
  font-size: 23px;
}

.canvas-test--slide .canvas-test__chip {
  padding: 16px 26px;
  border-radius: 0;
  border-color: var(--canvas-ink);
  background: var(--canvas-ink);
  color: var(--canvas-paper);
  font-size: 24px;
}

.canvas-test--slide .canvas-test__path code {
  padding: 10px 16px;
  border-radius: 0;
  background: var(--canvas-paper);
  color: var(--canvas-muted);
  font-size: 22px;
}

.canvas-test__slide-layout {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 0.92fr) minmax(420px, 0.74fr);
  align-items: center;
  gap: 82px;
  min-height: 0;
}

.canvas-test__agenda,
.canvas-test__timeline {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0;
}

.canvas-test__agenda {
  display: grid;
  gap: 0;
  border-top: 1px solid var(--canvas-rule);
}

.canvas-test__agenda li {
  display: grid;
  grid-template-columns: 88px minmax(0, 1fr);
  align-items: center;
  gap: 34px;
  min-height: 128px;
  padding: 28px 0;
  border-bottom: 1px solid var(--canvas-rule);
  background: transparent;
}

.canvas-test__agenda li span,
.canvas-test__timeline li span,
.canvas-test__cards article span {
  font-family: var(--canvas-font-mono);
  color: var(--canvas-accent);
  line-height: 1;
}

.canvas-test__agenda li span { font-size: 28px; font-weight: 600; }
.canvas-test__agenda li strong {
  color: var(--canvas-ink);
  font-size: 34px;
  font-weight: 600;
  line-height: 1.35;
}

.canvas-test__cards {
  position: relative;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0;
  border-top: 1px solid var(--canvas-rule);
  border-left: 1px solid var(--canvas-rule);
}

.canvas-test__cards article {
  display: grid;
  align-content: space-between;
  min-height: 390px;
  padding: 36px;
  border-right: 1px solid var(--canvas-rule);
  border-bottom: 1px solid var(--canvas-rule);
  background: color-mix(in srgb, var(--canvas-paper) 88%, white 8%);
}

.canvas-test__cards article span { font-size: 26px; font-weight: 700; }
.canvas-test__cards article p {
  margin: 0;
  color: var(--canvas-ink);
  font-size: 31px;
  line-height: 1.45;
}

.canvas-test__timeline {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  align-items: stretch;
  gap: 0;
  border-top: 1px solid var(--canvas-rule);
}

.canvas-test__timeline li {
  display: grid;
  align-content: start;
  gap: 34px;
  min-height: 340px;
  padding: 38px 30px;
  border-right: 1px solid var(--canvas-rule);
}

.canvas-test__timeline li:last-child {
  border-right: 0;
}

.canvas-test__timeline li span { font-size: 26px; font-weight: 700; }
.canvas-test__timeline li p {
  margin: 0;
  color: var(--canvas-ink);
  font-size: 33px;
  line-height: 1.35;
}

.canvas-test__notes {
  position: relative;
  display: grid;
  align-content: start;
  gap: 0;
  padding: 34px 38px;
  border: 1px solid var(--canvas-rule);
  background: color-mix(in srgb, var(--canvas-panel) 82%, white 10%);
}

.canvas-test__notes span {
  display: block;
  padding: 18px 0;
  border-bottom: 1px solid var(--canvas-rule);
  color: var(--canvas-ink);
  font-family: var(--canvas-font-mono);
  font-size: 26px;
  line-height: 1.4;
}

.canvas-test__notes span:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.canvas-test--slide-title .canvas-test__slide-layout {
  grid-template-columns: minmax(0, 1.12fr) minmax(390px, 0.5fr);
}

.canvas-test--slide-title .canvas-test__title {
  font-size: 142px;
  font-weight: 200;
}

.canvas-test--slide-agenda .canvas-test__slide-layout {
  grid-template-columns: minmax(0, 0.62fr) minmax(680px, 1fr);
}

.canvas-test--slide-agenda .canvas-test__title,
.canvas-test--slide-cards .canvas-test__title,
.canvas-test--slide-timeline .canvas-test__title,
.canvas-test--slide-closing .canvas-test__title {
  font-size: 82px;
  font-weight: 300;
}

.canvas-test--slide-cards .canvas-test__slide-layout,
.canvas-test--slide-timeline .canvas-test__slide-layout {
  grid-template-columns: 1fr;
  align-content: center;
}

.canvas-test--slide-cards .canvas-test__body,
.canvas-test--slide-timeline .canvas-test__body {
  max-width: 980px;
}

.canvas-test--slide-closing .canvas-test__slide-layout {
  grid-template-columns: minmax(0, 0.95fr) minmax(420px, 0.52fr);
}

/* === shell/reader-controls.css === */
.reader-side-nav {
  grid-area: right;
  display: grid;
  grid-template-rows: minmax(0, 1fr) auto;
  gap: 0;
  padding: 20px 0;
  border-left: 1px solid rgba(255, 255, 255, 0.06);
  color: var(--openpress-color-text-placeholder);
  font-size: 13px;
  letter-spacing: 0.06em;
  user-select: none;
  overflow: hidden;
}

.reader-side-nav .reader-bookmarks {
  position: relative;
  overflow-y: auto;
  padding: 0 18px 24px 28px;
  scrollbar-width: thin;
  scrollbar-color: rgba(255, 255, 255, 0.15) transparent;
}

.reader-side-nav .reader-bookmarks::-webkit-scrollbar { width: 4px; }
.reader-side-nav .reader-bookmarks::-webkit-scrollbar-thumb { background: rgba(255, 255, 255, 0.15); }

.reader-bookmarks-rail {
  position: absolute;
  left: 16px;
  top: 0;
  bottom: 24px;
  width: 1px;
  background: rgba(255, 255, 255, 0.1);
}

.reader-bookmarks-rail .reader-bookmarks-rail-fill {
  position: absolute;
  left: -1px;
  top: 0;
  width: 3px;
  height: var(--progress, 0%);
  background: var(--openpress-color-text-on-dark);
  transition: height 320ms cubic-bezier(0.22, 0.61, 0.36, 1);
}

.side-nav-indicator {
  display: none;
}

.reader-side-nav .side-menu {
  display: flex;
  flex-direction: column;
  gap: 2px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding: 12px 18px 0 32px;
  position: relative;
}

.reader-side-nav .side-menu::before {
  content: "";
  position: absolute;
  left: 16px;
  top: 14px;
  bottom: 4px;
  width: 1px;
  background: rgba(255, 255, 255, 0.18);
}

.reader-side-nav .side-menu-item {
  display: grid;
  grid-template-columns: 16px 1fr;
  align-items: center;
  gap: 12px;
  background: transparent;
  border: 0;
  color: var(--openpress-color-text-placeholder);
  font-family: inherit;
  font-size: 11px;
  letter-spacing: 0.16em;
  cursor: pointer;
  padding: 7px 0;
  text-align: left;
  white-space: nowrap;
  transition: color 150ms ease;
  line-height: 1.4;
}

.reader-side-nav .side-menu-item:hover:not(:disabled):not(.side-menu-static) {
  color: var(--openpress-color-text-on-dark);
}

.reader-side-nav .side-menu-item:disabled {
  opacity: 0.3;
  cursor: not-allowed;
}

.side-menu-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  line-height: 1;
  letter-spacing: 0;
  opacity: 0.75;
}

.side-menu-label {
  min-width: 0;
}

.side-menu-static {
  cursor: default;
}

.side-menu-count {
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.12em;
}

.side-menu-count .sep {
  margin: 0 4px;
  opacity: 0.5;
}

.reader-progress-track {
  width: 2px;
  height: 180px;
  background: rgba(255, 255, 255, 0.12);
  position: relative;
}

.reader-progress-track .reader-progress-fill {
  position: absolute;
  top: 0;
  left: -1px;
  width: 4px;
  height: var(--progress, 0%);
  background: rgba(255, 255, 255, 0.6);
  transition: height 320ms cubic-bezier(0.22, 0.61, 0.36, 1),
              width 320ms cubic-bezier(0.22, 0.61, 0.36, 1);
}

.reader-side-count {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3px;
  font-variant-numeric: tabular-nums;
  font-size: 13px;
  letter-spacing: 0.08em;
  opacity: 0.7;
}

.reader-side-count .sep {
  color: var(--openpress-color-border-strong);
  font-size: 10px;
}

.reader-thumb-strip {
  grid-area: left;
  display: flex;
  flex-direction: column;
  gap: 14px;
  width: 100%;
  height: 100%;
  overflow-y: auto;
  padding: 20px 16px;
  border-right: 1px solid rgba(255, 255, 255, 0.06);
  scrollbar-width: thin;
  scrollbar-color: rgba(255, 255, 255, 0.15) transparent;
}

.reader-thumb-strip::-webkit-scrollbar { width: 4px; }
.reader-thumb-strip::-webkit-scrollbar-thumb { background: rgba(255, 255, 255, 0.15); }

.thumb-strip-item {
  display: flex;
  flex-direction: column;
  gap: 6px;
  background: transparent;
  border: 0;
  cursor: pointer;
  padding: 0;
  width: 100%;
  text-align: left;
  font-family: inherit;
  color: var(--openpress-color-text-placeholder);
  transition: color 150ms ease;
}

.thumb-strip-frame {
  position: relative;
  width: 100%;
  aspect-ratio: 210 / 297;
  overflow: hidden;
  background: var(--openpress-color-document);
  outline: 1px solid rgba(255, 255, 255, 0.08);
  transition: outline 150ms ease;
}

.thumb-strip-content {
  position: absolute;
  top: 0;
  left: 0;
  width: 980px;
  transform-origin: 0 0;
  pointer-events: none;
}

.thumb-strip-item:hover .thumb-strip-frame {
  outline-color: rgba(255, 255, 255, 0.25);
}

.thumb-strip-item.is-active .thumb-strip-frame {
  outline: 2px solid var(--openpress-color-focus);
  outline-offset: 2px;
  box-shadow: 0 0 0 1px rgba(0, 0, 0, 0.5), 0 4px 16px rgba(15, 98, 254, 0.35);
}

.thumb-strip-item.is-active .thumb-strip-label {
  color: var(--openpress-color-focus);
}

.thumb-strip-item.is-active {
  color: var(--openpress-color-text-on-dark);
}

.thumb-strip-label {
  display: flex;
  align-items: baseline;
  gap: 6px;
  font-size: 10px;
  letter-spacing: 0.06em;
  padding: 0 2px;
}

.thumb-strip-index {
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.06em;
  flex-shrink: 0;
}

.thumb-strip-title {
  flex: 1;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.reader-bookmarks {
  display: flex;
  flex-direction: column;
  gap: 0;
  width: 100%;
  overflow: hidden;
  padding: 0;
  min-width: 0;
}

.bookmark-group {
  display: flex;
  flex-direction: column;
}

.bookmark-item {
  display: grid;
  width: 100%;
  min-width: 0;
  column-gap: 10px;
  align-items: baseline;
  padding: 7px 0;
  background: transparent;
  border: 0;
  cursor: pointer;
  text-align: left;
  font-family: inherit;
  letter-spacing: 0.02em;
  color: var(--openpress-color-text-secondary);
  transition: color 150ms ease;
}

.bookmark-title {
  min-width: 0;
}

.bookmark-h2 {
  grid-template-columns: 28px minmax(0, 1fr);
  font-size: 14.5px;
  line-height: 1.5;
  font-weight: 400;
  opacity: 0.7;
  padding: 8px 0;
}

.bookmark-h2:hover {
  opacity: 1;
}

.bookmark-h2.is-active {
  opacity: 1;
  color: var(--openpress-color-text-on-dark);
}

.bookmark-h3 {
  grid-template-columns: 34px minmax(0, 1fr);
  padding: 6px 0 6px 38px;
  margin-left: 0;
  font-size: 12.5px;
  line-height: 1.45;
  opacity: 0.5;
  color: var(--openpress-color-text-placeholder);
}

.bookmark-h3:hover {
  opacity: 0.85;
}

.bookmark-h3.is-active {
  opacity: 1;
  color: var(--openpress-color-text-on-dark);
}

.bookmark-index {
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.06em;
  color: inherit;
}

.bookmark-title {
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  color: inherit;
}

.bookmark-h3 .bookmark-title {
  -webkit-line-clamp: 1;
}

.bookmark-subs {
  display: flex;
  flex-direction: column;
  overflow: hidden;
  max-height: 0;
  transition: max-height 220ms ease;
}

.bookmark-group.is-open .bookmark-subs {
  max-height: none;
  overflow: visible;
}

.bookmark-item:focus-visible {
  outline: 1px solid var(--openpress-color-focus);
  outline-offset: 2px;
}


.reader-thumbs {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  align-content: start;
  gap: 24px;
  padding: 48px;
  overflow-y: auto;
  background: rgba(15, 15, 15, 0.96);
  backdrop-filter: blur(18px);
  animation: thumbs-in 140ms ease-out both;
}

.reader-thumbs[hidden] {
  display: none;
}

@keyframes thumbs-in {
  from { opacity: 0; }
  to { opacity: 1; }
}

.thumb-item {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 0;
  margin: 0;
  background: transparent;
  border: 0;
  color: var(--openpress-color-text-secondary);
  font-family: inherit;
  text-align: left;
  cursor: pointer;
}

.thumb-frame {
  position: relative;
  width: 100%;
  aspect-ratio: 210 / 297;
  overflow: hidden;
  background: var(--openpress-color-document);
  outline: 1px solid var(--openpress-color-border-subtle);
  outline-offset: 0;
  transition: outline-color 120ms ease, transform 120ms ease;
}

.thumb-item:hover .thumb-frame {
  outline-color: var(--openpress-color-text-secondary);
  transform: translateY(-2px);
}

.thumb-item.is-active .thumb-frame {
  outline: 1px solid var(--openpress-color-text-on-dark);
}

.thumb-content {
  position: absolute;
  top: 0;
  left: 0;
  width: 980px;
  transform-origin: 0 0;
  pointer-events: none;
}

.thumb-label {
  display: flex;
  align-items: baseline;
  gap: 8px;
  font-size: 12px;
  line-height: 1.35;
  color: var(--openpress-color-text-secondary);
}

.thumb-index {
  flex-shrink: 0;
  color: var(--openpress-color-text-placeholder);
  font-variant-numeric: tabular-nums;
  font-size: 11px;
  letter-spacing: 0.06em;
}

.thumb-title {
  flex: 1;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.thumb-item.is-active .thumb-label {
  color: var(--openpress-color-text-on-dark);
}

.thumb-item:focus-visible .thumb-frame {
  outline: 2px solid var(--openpress-color-focus);
}

body.thumbs-open {
  overflow: hidden;
}

@media screen and (max-width: 1199px) {
  .reader-app,
  .reader-app.is-closed-left,
  .reader-app.is-closed-right,
  .reader-app.is-closed-left.is-closed-right {
    grid-template-columns: minmax(0, 1fr);
    grid-template-areas:
      "nav"
      "main";
  }

  .reader-thumb-strip {
    position: fixed;
    top: 56px;
    left: 0;
    width: clamp(240px, 60vw, 320px);
    height: calc(100vh - 56px);
    z-index: 25;
    background: var(--openpress-color-app-bg);
    transform: translateX(0);
    transition: transform 240ms cubic-bezier(0.22, 0.61, 0.36, 1);
    box-shadow: 16px 0 32px rgba(0, 0, 0, 0.55);
    display: flex !important;
  }

  .reader-app.is-closed-left .reader-thumb-strip {
    transform: translateX(-100%);
    box-shadow: none;
  }

  .reader-side-nav {
    position: fixed;
    top: 56px;
    right: 0;
    width: clamp(280px, 70vw, 360px);
    height: calc(100vh - 56px);
    z-index: 25;
    background: var(--openpress-color-app-bg);
    transform: translateX(0);
    transition: transform 240ms cubic-bezier(0.22, 0.61, 0.36, 1);
    box-shadow: -16px 0 32px rgba(0, 0, 0, 0.55);
    padding: 20px 0;
    display: grid !important;
  }

  .reader-app.is-closed-right .reader-side-nav {
    transform: translateX(100%);
    box-shadow: none;
  }

  .reader-app.is-floating-backdrop::before {
    content: "";
    position: fixed;
    top: 56px;
    inset-inline: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.35);
    z-index: 24;
    -webkit-backdrop-filter: blur(2px);
    backdrop-filter: blur(2px);
  }
}

@media screen and (max-width: 767px) {
  .reader-app {
    grid-template-rows: 52px minmax(0, 1fr);
    grid-template-columns: 1fr;
    grid-template-areas:
      "nav"
      "main";
  }

  .reader-thumb-strip,
  .reader-side-nav {
    top: 52px;
    height: calc(100vh - 52px);
  }

  .reader-app.is-floating-backdrop::before {
    top: 52px;
  }

  .reader-thumb-strip {
    display: none;
  }

  .reader-navbar {
    padding: 0 14px;
    grid-template-columns: 1fr auto;
  }

  .navbar-sub,
  .navbar-hints,
  [data-reader-thumbs] {
    display: none;
  }

  .navbar-icon[data-toggle-right],
  .navbar-icon[data-toggle-left] {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    color: var(--openpress-color-text-secondary);
    opacity: 1;
  }

  .navbar-icon[data-toggle-left] {
    font-size: 18px;
  }

  .navbar-mark {
    font-size: 16px;
  }

  .navbar-btn,
  .navbar-menu-btn {
    display: none;
  }

  .reader-stage {
    overflow: auto;
    -webkit-overflow-scrolling: touch;
    background: var(--openpress-color-app-bg);
  }

  .reader-thumbs {
    padding: 16px;
    gap: 12px;
    grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
  }

  .thumb-label {
    font-size: 10px;
  }

  .reader-side-nav {
    width: clamp(260px, 80vw, 340px);
  }
}

/* === base/print.css === */
@media print {
  html,
  body {
    background: #fff;
  }

  .reader-app {
    display: block;
    height: auto;
    overflow: visible;
    grid-template-columns: none !important;
    grid-template-rows: none !important;
    grid-template-areas: none !important;
  }

  .reader-navbar,
  .reader-side-nav,
  .reader-thumb-strip,
  .reader-thumbs,
  .reader-page.measurement {
    display: none !important;
  }

  .reader-stage,
  .reader-pages {
    display: block;
    padding: 0;
    perspective: none;
    width: auto;
    height: auto;
    background: #fff;
  }

  .reader-page,
  .reader-page.is-active,
  .reader-page--cover.is-active,
  .reader-page--back-cover.is-active {
    display: block;
    width: auto;
    aspect-ratio: auto;
    max-height: none;
    overflow: visible;
    box-shadow: none;
    outline: 0;
    margin: 0;
    break-after: auto;
    animation: none !important;
    transform: none !important;
  }

  .reader-page--cover,
  .reader-page--toc,
  .reader-page--content,
  .reader-page--back-cover {
    padding: 0;
  }

  .reader-page--toc {
    break-before: page;
  }

  .reader-page--back-cover {
    break-before: page;
  }

  .reader-page--content h2[data-chapter] {
    break-before: page;
    break-after: avoid;
  }

  h2,
  h3,
  h4 {
    break-after: avoid;
  }

  figure,
  table,
  .toc-list {
    break-inside: avoid;
  }

  .toc-list a {
    display: grid;
    grid-template-columns: 10mm 1fr 14mm;
    gap: 4mm;
    align-items: baseline;
  }

  a {
    color: inherit;
  }
}

/* === engine/katex.css === */
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