/* ScaledPapers — Paper reader (outline + document + margin notes) */

:root, [data-theme="light"] {
  --color-bg:               #f5f4f0;
  --color-surface:          #f9f8f4;
  --color-surface-2:        #fdfcf9;
  --color-surface-offset:   #eeece7;
  --color-surface-dynamic:  #e5e3dd;
  --color-divider:          #d8d6d0;
  --color-border:           #ccc9c2;
  --color-text:             #1e1c17;
  --color-text-muted:       #6b6a65;
  --color-text-faint:       #b0ae9e;
  --color-text-inverse:     #f5f4f0;
  --color-primary:          #c06000;
  --color-primary-hover:    #9c4d00;
  --color-primary-active:   #7a3a00;
  --color-primary-highlight:#f0dcc4;
  --color-success:          #3a7a1e;
  --color-blue:             #005f8a;
  --color-purple:           #6a38a0;
  --reader-font-scale:      1;
  --font-display: 'Instrument Serif', Georgia, serif;
  --font-body:    'DM Sans', 'Helvetica Neue', sans-serif;
  --font-reading: 'Newsreader', Georgia, serif;
  --reader-paper-max:       40rem;
  --rail-width:             280px;
  --focus-rail-width:       clamp(360px, 28vw, 460px);
  --shelf-width:            min(220px, 28vw);
  --toc-width:              11.5rem;
  --nav-h:                  52px;
  --transition:             180ms cubic-bezier(0.16, 1, 0.3, 1);
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-full: 9999px;
  --space-1: 0.25rem;  --space-2: 0.5rem;   --space-3: 0.75rem;
  --space-4: 1rem;     --space-5: 1.25rem;  --space-6: 1.5rem;
  --space-8: 2rem;     --space-10: 2.5rem;  --space-12: 3rem;
}

[data-theme="dark"] {
  --color-bg:               #141310;
  --color-surface:          #191816;
  --color-surface-2:        #1e1d1a;
  --color-surface-offset:   #1b1a17;
  --color-surface-dynamic:  #252320;
  --color-divider:          #2b2927;
  --color-border:           #373532;
  --color-text:             #e0ded8;
  --color-text-muted:       #7e7c75;
  --color-text-faint:       #55534d;
  --color-text-inverse:     #1a1917;
  --color-primary:          #e5841e;
  --color-primary-hover:    #f09840;
  --color-primary-active:   #f5b070;
  --color-primary-highlight:#3d2a12;
  --color-success:          #6daa45;
  --color-blue:             #5591c7;
  --color-purple:           #a86fdf;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    --color-bg:#141310; --color-surface:#191816; --color-surface-2:#1e1d1a;
    --color-surface-offset:#1b1a17; --color-surface-dynamic:#252320;
    --color-divider:#2b2927; --color-border:#373532;
    --color-text:#e0ded8; --color-text-muted:#7e7c75; --color-text-faint:#55534d;
    --color-text-inverse:#1a1917; --color-primary:#e5841e;
    --color-primary-hover:#f09840; --color-primary-active:#f5b070;
    --color-primary-highlight:#3d2a12; --color-success:#6daa45;
    --color-blue:#5591c7; --color-purple:#a86fdf;
  }
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html {
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--nav-h) + 48px);
}
body.reader-body {
  min-height: 100dvh;
  max-width: 100%;
  overflow-x: hidden;
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
}
img, svg { display: block; max-width: 100%; }
button { font: inherit; color: inherit; cursor: pointer; background: none; border: none; }
a { color: var(--color-primary); text-underline-offset: 2px; }
a:hover { color: var(--color-primary-hover); }
:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}
.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}

/* Header */
.reader-nav {
  position: sticky;
  top: 0;
  z-index: 60;
  border-bottom: 1px solid var(--color-divider);
  background: color-mix(in oklch, var(--color-bg) 92%, transparent);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}
.reader-nav-inner {
  max-width: 1440px;
  margin-inline: auto;
  padding: var(--space-2) var(--space-6);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  min-height: var(--nav-h);
}
.reader-nav-start {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  min-width: 0;
  flex-shrink: 0;
}
.reader-shelf-toggle {
  display: none;
  padding: var(--space-1) var(--space-3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-text-muted);
  white-space: nowrap;
}
.reader-shelf-toggle:hover,
.reader-shelf-toggle[aria-expanded="true"] {
  background: var(--color-surface-offset);
  color: var(--color-text);
}
.reader-shelf-toggle[aria-expanded="true"] {
  color: var(--color-primary);
  border-color: var(--color-primary);
  background: var(--color-primary-highlight);
}
.reader-nav-brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  text-decoration: none;
  color: var(--color-text);
  font-family: var(--font-display);
  font-size: 1.0625rem;
  letter-spacing: -0.02em;
  flex-shrink: 0;
}
.reader-nav-logo { width: 26px; height: 26px; flex-shrink: 0; }
.reader-nav-context {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.reader-nav-meta {
  flex: 1;
  min-width: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-4);
}
.reader-nav-tools {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-shrink: 0;
}
.reader-auth {
  position: relative;
}
.reader-auth-icon {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  color: var(--color-text-muted);
}
.reader-auth-icon:hover,
.reader-auth-icon[aria-expanded="true"] {
  background: var(--color-surface-offset);
  color: var(--color-text);
}
.reader-auth-panel {
  position: absolute;
  top: calc(100% + var(--space-2));
  right: 0;
  z-index: 30;
  width: min(18rem, calc(100vw - var(--space-6)));
  padding: var(--space-3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
  box-shadow: 0 18px 48px rgba(0, 0, 0, 0.18);
}
.reader-auth-panel[hidden] {
  display: none !important;
}
.reader-auth-form,
.reader-auth-session {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-wrap: wrap;
}
.reader-auth-form[hidden],
.reader-auth-session[hidden] {
  display: none !important;
}
.reader-auth-input {
  flex: 1 1 9rem;
  min-width: 0;
  padding: var(--space-1) var(--space-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  background: var(--color-surface);
  color: var(--color-text);
  font-size: 0.75rem;
}
.reader-auth-btn {
  padding: var(--space-1) var(--space-3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  color: var(--color-text-muted);
  font-size: 0.75rem;
  font-weight: 600;
}
.reader-auth-btn:hover {
  background: var(--color-surface-offset);
  color: var(--color-text);
}
.reader-auth-btn:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}
.reader-auth-email,
.reader-auth-status {
  flex-basis: 100%;
  max-width: 100%;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-size: 0.72rem;
  color: var(--color-text-muted);
}
.reader-auth-status {
  color: var(--color-text-faint);
}
.reader-focus-toggle {
  padding: var(--space-1) var(--space-3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-text-muted);
}
.reader-focus-toggle:hover {
  background: var(--color-surface-offset);
  color: var(--color-text);
}
.reader-focus-toggle[aria-pressed="true"] {
  color: var(--color-primary);
  border-color: var(--color-primary);
  background: var(--color-primary-highlight);
}
.reader-ai-mobile-toggle {
  display: none;
  padding: var(--space-1) var(--space-3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-text-muted);
}
.reader-ai-mobile-toggle:hover {
  background: var(--color-surface-offset);
  color: var(--color-text);
}
.reader-ai-mobile-toggle[aria-expanded="true"] {
  color: var(--color-primary);
  border-color: var(--color-primary);
  background: var(--color-primary-highlight);
}
.reader-nav-settings {
  position: relative;
  display: flex;
  align-items: center;
}
.reader-settings-toggle {
  display: none;
  width: 36px;
  height: 36px;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  color: var(--color-text-muted);
}
.reader-settings-toggle:hover,
.reader-settings-toggle[aria-expanded="true"] {
  background: var(--color-surface-offset);
  color: var(--color-text);
}
.reader-settings-toggle[aria-expanded="true"] {
  color: var(--color-primary);
  border-color: var(--color-primary);
  background: var(--color-primary-highlight);
}
.reader-settings-panel {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}
.reader-settings-item {
  display: flex;
  align-items: center;
}
.reader-settings-label {
  display: none;
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-text-faint);
}
.reader-font-stepper {
  display: flex;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  overflow: hidden;
}
.reader-font-btn {
  padding: var(--space-1) var(--space-3);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-text-muted);
}
.reader-font-btn:hover {
  background: var(--color-surface-offset);
  color: var(--color-text);
}
.theme-toggle {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-full);
  color: var(--color-text-muted);
}
.theme-toggle:hover {
  background: var(--color-surface-offset);
  color: var(--color-text);
}
.reader-progress {
  height: 2px;
  background: var(--color-divider);
}
.reader-progress-bar {
  display: block;
  width: 0%;
  height: 100%;
  background: var(--color-primary);
  transition: width 120ms linear;
}

/* Issue strip */
.reader-issue-bar {
  max-width: 1440px;
  margin-inline: auto;
  padding: var(--space-6) var(--space-6) var(--space-5);
  border-bottom: 1px solid var(--color-divider);
  background: var(--color-surface);
  display: grid;
  grid-template-columns: 1fr auto;
  gap: var(--space-4) var(--space-8);
}
.reader-overview-kicker {
  font-size: 0.6875rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-primary);
  font-weight: 700;
  margin-bottom: var(--space-2);
}
.reader-overview-title {
  font-family: var(--font-display);
  font-size: clamp(1.4rem, 1rem + 1.2vw, 2rem);
  line-height: 1.12;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-2);
}
.reader-overview-subtitle {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  max-width: 68ch;
  line-height: 1.6;
}
.reader-overview-how {
  margin-top: var(--space-2);
  font-size: 0.82rem;
  color: var(--color-text-muted);
  line-height: 1.55;
}
.reader-overview-trust {
  margin-top: var(--space-3);
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}
.reader-overview-chip {
  display: inline-flex;
  align-items: center;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  padding: 0.15rem 0.5rem;
  font-size: 0.67rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  color: var(--color-text-muted);
  background: var(--color-surface-2);
}
.reader-overview-actions {
  justify-self: end;
  display: grid;
  gap: var(--space-2);
  align-content: start;
}
.reader-overview-cta {
  justify-self: end;
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-full);
  border: 1px solid var(--color-primary);
  background: var(--color-primary);
  color: #fff;
  font-size: 0.8rem;
  font-weight: 700;
}
.reader-overview-cta:hover {
  background: var(--color-primary-hover);
  border-color: var(--color-primary-hover);
}
.reader-overview-cta--secondary {
  justify-self: end;
  text-decoration: none;
  background: transparent;
  color: var(--color-text-muted);
  border-color: var(--color-border);
}
.reader-overview-cta--secondary:hover {
  background: var(--color-surface-offset);
  border-color: var(--color-primary);
  color: var(--color-primary);
}
.reader-overview-filters {
  grid-column: 1 / -1;
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
}
.reader-overview-filter {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  padding: var(--space-2) var(--space-4);
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--color-text-muted);
}
.reader-overview-filter:hover {
  color: var(--color-text);
  background: var(--color-surface-offset);
}
.reader-overview-filter.is-active {
  color: var(--color-primary);
  border-color: var(--color-primary);
  background: var(--color-primary-highlight);
}
kbd {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 0.72em;
  padding: 0.1em 0.4em;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
  background: var(--color-surface-2);
  color: var(--color-text-muted);
}

/* Layout: shelf | (toc + main) | rail */
.reader-layout {
  max-width: 1440px;
  margin-inline: auto;
  display: grid;
  grid-template-columns: var(--shelf-width) minmax(0, 1fr) var(--reader-split-width, 12px) var(--reader-rail-width, var(--rail-width));
  min-height: calc(100dvh - var(--nav-h) - 52px);
  border-bottom: 1px solid var(--color-divider);
}

.reader-shelf {
  border-right: 1px solid var(--color-divider);
  background: var(--color-bg);
  padding: var(--space-6) var(--space-3);
  position: sticky;
  top: calc(var(--nav-h) + 2px);
  align-self: start;
  max-height: calc(100dvh - var(--nav-h) - 2px);
  overflow: auto;
}
.reader-shelf-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: var(--space-4);
  padding-inline: var(--space-1);
}
.reader-shelf-head-actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}
.reader-shelf-close {
  display: none;
  padding: var(--space-1) var(--space-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  font-size: 0.68rem;
  font-weight: 600;
  color: var(--color-text-muted);
}
.reader-shelf-close:hover {
  color: var(--color-text);
  background: var(--color-surface-offset);
}
.reader-shelf-backdrop {
  position: fixed;
  inset: 0;
  z-index: 50;
  border: none;
  background: color-mix(in oklch, var(--color-bg) 28%, transparent);
  backdrop-filter: blur(2px);
}
.reader-shelf-backdrop[hidden] {
  display: none;
}
.reader-shelf-title {
  font-size: 0.625rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-text-faint);
}
.reader-shelf-count {
  font-size: 0.6875rem;
  font-weight: 600;
  color: var(--color-text-muted);
}
.reader-shelf-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}
.reader-shelf-item {
  width: 100%;
  text-align: left;
  padding: var(--space-3);
  border-radius: var(--radius-lg);
  border: 1px solid transparent;
  background: transparent;
  display: grid;
  grid-template-columns: auto 1fr;
  gap: var(--space-1) var(--space-2);
  align-items: start;
  transition: background var(--transition), border-color var(--transition);
}
.reader-shelf-item:hover { background: var(--color-surface-offset); }
.reader-shelf-item.is-active {
  background: var(--color-surface);
  border-color: var(--color-border);
  box-shadow: inset 3px 0 0 var(--color-primary);
}
.reader-shelf-empty {
  grid-template-columns: 1fr;
}
.reader-shelf-empty-link {
  color: var(--color-primary);
  font-size: 0.75rem;
  font-weight: 700;
  text-decoration: none;
}
.reader-shelf-empty-link:hover {
  text-decoration: underline;
}
.reader-shelf-item-type {
  grid-column: 1 / -1;
  font-size: 0.5625rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-primary);
}
.reader-shelf-item-license {
  grid-column: 1 / -1;
  justify-self: start;
}
.reader-shelf-item-score {
  font-family: var(--font-display);
  font-size: 0.9375rem;
  color: var(--color-primary);
  line-height: 1.2;
}
.reader-shelf-item-name {
  font-size: 0.75rem;
  color: var(--color-text);
  line-height: 1.35;
}

.reader-doc-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  min-width: 0;
  background: var(--color-surface-2);
  border-inline: 1px solid var(--color-divider);
}

.reader-toc-slot {
  border-right: 1px solid var(--color-divider);
  background: var(--color-surface);
  position: sticky;
  top: var(--nav-h);
  align-self: start;
  max-height: calc(100dvh - var(--nav-h) - 12px);
  overflow-y: auto;
  padding: var(--space-6) var(--space-4);
}

.reader-toc[hidden] { display: none !important; }
.reader-toc-heading {
  font-size: 0.625rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-text-faint);
  margin-bottom: var(--space-4);
}
.reader-toc-list {
  list-style: none;
  padding-bottom: var(--space-4);
}
.reader-toc-list li { margin-bottom: var(--space-1); }
.reader-toc-list a {
  display: block;
  padding: var(--space-2) var(--space-2);
  border-radius: var(--radius-md);
  font-size: 0.75rem;
  line-height: 1.35;
  color: var(--color-text-muted);
  text-decoration: none;
  border-left: 2px solid transparent;
}
.reader-toc-list a:hover {
  color: var(--color-text);
  background: var(--color-surface-offset);
}
.reader-toc-list a.is-active-toc {
  color: var(--color-text);
  font-weight: 600;
  border-left-color: var(--color-primary);
  background: var(--color-primary-highlight);
}

.reader-main {
  padding: var(--space-10) var(--space-8) var(--space-16);
  min-width: 0;
}
.reader-article {
  animation: reader-fade-in 180ms ease-out;
}
.reader-article[hidden] { display: none !important; }

/* Paper chrome */
.reader-paper {
  max-width: var(--reader-paper-max);
  margin-inline: auto;
}
.reader-paper.is-pdf-view {
  max-width: min(96vw, 82rem);
}
.reader-paper.is-pdf-view .reader-paper-title {
  display: none;
}
.reader-paper.is-pdf-view .reader-paper-header {
  display: none;
}
body.reader-body.reader-pdf-mode .reader-main {
  padding-top: 0;
  padding-bottom: 0;
}
.reader-paper-header {
  margin-bottom: var(--space-10);
  padding-bottom: var(--space-8);
  border-bottom: 1px solid var(--color-divider);
}
.reader-paper.is-pdf-view .reader-paper-header {
  margin-bottom: var(--space-4);
  padding-bottom: var(--space-4);
}
.reader-paper-venue {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-text-faint);
  margin-bottom: var(--space-3);
}
.reader-paper-title {
  font-family: var(--font-display);
  font-size: clamp(1.375rem, 1rem + 1.5vw, 2rem);
  font-weight: 400;
  line-height: 1.18;
  letter-spacing: -0.02em;
  margin-top: var(--space-4);
  margin-bottom: var(--space-4);
  text-wrap: balance;
}
.reader-paper-byline {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  line-height: 1.55;
  max-width: none;
}
.reader-license-badges {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-top: var(--space-3);
}
.reader-license-chip {
  display: inline-flex;
  align-items: center;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  padding: 0.2rem 0.55rem;
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--color-text-muted);
  background: var(--color-surface-2);
}
.reader-license-chip--ok {
  color: var(--color-success);
  border-color: color-mix(in oklch, var(--color-success) 45%, var(--color-border));
  background: color-mix(in oklch, var(--color-success) 10%, var(--color-surface));
}
.reader-license-chip--warn {
  color: var(--color-primary);
  border-color: color-mix(in oklch, var(--color-primary) 45%, var(--color-border));
  background: var(--color-primary-highlight);
}
.reader-license-note {
  margin-top: var(--space-2);
  font-size: 0.76rem;
  color: var(--color-text-faint);
  line-height: 1.45;
}
.reader-paper-actions {
  margin-top: var(--space-5);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-3);
}
.reader-paper-actions .reader-resource-links {
  margin-top: 0;
}
.reader-paper-btn {
  display: inline-flex;
  align-items: center;
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-md);
  background: var(--color-primary);
  color: #fff;
  font-size: 0.8125rem;
  font-weight: 600;
  text-decoration: none;
}
.reader-paper-btn:hover { background: var(--color-primary-hover); color: #fff; }
.reader-paper-btn--ghost {
  background: transparent;
  color: var(--color-text);
  border: 1px solid var(--color-border);
}
.reader-paper-btn--ghost:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.reader-abstract {
  margin-bottom: var(--space-8);
  padding: var(--space-6);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  border-left-width: 4px;
  border-left-color: var(--color-primary);
  background: color-mix(in oklch, var(--color-primary) 6%, var(--color-surface));
}
.reader-abstract-title {
  font-family: var(--font-body);
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-text-faint);
  margin-bottom: var(--space-3);
}
.reader-abstract p {
  font-family: var(--font-reading);
  font-size: calc(1.0625rem * var(--reader-font-scale));
  line-height: 1.75;
  color: var(--color-text);
  max-width: none;
}
.reader-rights-panel {
  margin-top: var(--space-5);
  padding-top: var(--space-4);
  border-top: 1px solid var(--color-border);
}
.reader-rights-row {
  display: flex;
  justify-content: space-between;
  gap: var(--space-4);
  margin-bottom: var(--space-2);
  font-size: 0.8rem;
  color: var(--color-text-muted);
}
.reader-rights-key {
  font-weight: 700;
  color: var(--color-text-faint);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.reader-rights-links {
  display: flex;
  gap: var(--space-4);
  margin-top: var(--space-3);
  font-size: 0.8rem;
}
.reader-resource-links {
  margin-top: var(--space-4);
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  align-items: center;
  font-size: 0.85rem;
}
.reader-resource-links a {
  color: var(--color-text-muted);
  text-decoration: none;
}
.reader-resource-links a:hover {
  color: var(--color-primary);
}
.reader-resource-links--nav {
  margin-top: 0;
  gap: var(--space-3);
  font-size: 0.78rem;
  flex-wrap: nowrap;
}
.reader-license-restricted {
  margin-top: var(--space-3);
  padding: var(--space-4);
  border: 1px solid var(--color-border);
  border-left-width: 4px;
  border-left-color: var(--color-primary);
  border-radius: var(--radius-md);
  background: color-mix(in oklch, var(--color-primary) 7%, var(--color-surface));
  color: var(--color-text-muted);
  line-height: 1.6;
}
.reader-keywords {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  margin-bottom: var(--space-10);
  line-height: 1.5;
}
.reader-keywords-label { font-weight: 700; color: var(--color-text-faint); margin-right: var(--space-2); }

.reader-prose--paper {
  font-family: var(--font-reading);
  font-size: calc(1.0625rem * var(--reader-font-scale));
  line-height: 1.8;
  color: var(--color-text);
}
.reader-prose--paper p {
  max-width: none;
  margin-bottom: var(--space-5);
}
.reader-paper-fulltext {
  white-space: pre-wrap;
  line-height: 1.7;
  word-break: break-word;
  max-height: none;
}
.reader-pdf-embed {
  display: block;
  line-height: 1;
  height: calc(100dvh - var(--nav-h) - 2px);
  overflow: auto;
}
.reader-pdf-embed--loading {
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-muted);
  font-size: 0.9rem;
}
.reader-pdf-pages {
  display: grid;
  gap: var(--space-4);
}
.reader-pdf-page {
  position: relative;
  margin-inline: auto;
  box-shadow: 0 8px 22px color-mix(in oklch, var(--color-bg) 72%, transparent);
  background: #fff;
  border-radius: var(--radius-lg);
  outline: 1px solid var(--color-border);
  outline-offset: -1px;
  overflow: hidden;
}
.reader-pdf-canvas {
  display: block;
  vertical-align: top;
  background: #fff;
}
.reader-pdf-text-layer {
  position: absolute;
  inset: 0;
  overflow: visible;
  line-height: 1;
}
.reader-pdf-text-layer span,
.reader-pdf-text-layer br {
  color: transparent;
  position: absolute;
  white-space: pre;
  transform-origin: 0% 0%;
  cursor: text;
  padding-inline-end: 0.06em;
}
.reader-pdf-text-layer mark.reader-highlight-mark {
  background: color-mix(in oklch, var(--color-primary) 35%, transparent);
  color: transparent;
  padding: 0;
  border-radius: 0.1em;
}
.reader-pdf-highlight {
  position: absolute;
  background: color-mix(in oklch, var(--color-primary) 35%, transparent);
  border-radius: 0.1em;
  pointer-events: none;
}
.reader-pdf-text-layer::selection,
.reader-pdf-text-layer span::selection {
  background: color-mix(in oklch, var(--color-primary) 35%, transparent);
}
.reader-paper-fulltext--html {
  white-space: normal;
  word-break: normal;
  overflow-wrap: anywhere;
  line-height: 1.7;
}
.reader-paper-fulltext--html p,
.reader-paper-fulltext--html li,
.reader-paper-fulltext--html blockquote {
  font-family: var(--font-reading);
  font-size: calc(1.0625rem * var(--reader-font-scale));
}
.reader-paper-fulltext--html p { margin-bottom: var(--space-5); }
.reader-paper-fulltext--html h1,
.reader-paper-fulltext--html h2,
.reader-paper-fulltext--html h3,
.reader-paper-fulltext--html h4 {
  font-family: var(--font-body);
  line-height: 1.3;
  margin-top: var(--space-8);
  margin-bottom: var(--space-4);
}
.reader-paper-fulltext--html h1 { font-size: clamp(1.4rem, 1rem + 1.2vw, 1.9rem); }
.reader-paper-fulltext--html h2 { font-size: 1.3rem; }
.reader-paper-fulltext--html h3 { font-size: 1.12rem; }
.reader-paper-fulltext--html ul,
.reader-paper-fulltext--html ol { padding-left: 1.25rem; margin-bottom: var(--space-5); }
.reader-paper-fulltext--html figure {
  margin: var(--space-8) 0;
}
.reader-paper-fulltext--html figcaption {
  margin-top: var(--space-2);
  color: var(--color-text-muted);
  font-size: 0.85rem;
  line-height: 1.5;
}
.reader-paper-fulltext--html img,
.reader-paper-fulltext--html video,
.reader-paper-fulltext--html iframe,
.reader-paper-fulltext--html table {
  max-width: 100%;
}
.reader-paper-fulltext--html img.reader-ai-image-selected {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
  border-radius: 4px;
}
.reader-paper-fulltext--html table {
  display: block;
  overflow-x: auto;
  border-collapse: collapse;
  margin-bottom: var(--space-5);
}
.reader-paper-fulltext--html th,
.reader-paper-fulltext--html td {
  border: 1px solid var(--color-border);
  padding: var(--space-2) var(--space-3);
}
.reader-section-heading {
  font-family: var(--font-body);
  font-size: 1.0625rem;
  font-weight: 700;
  margin-top: var(--space-10);
  margin-bottom: var(--space-4);
  scroll-margin-top: calc(var(--nav-h) + var(--space-6));
  color: var(--color-text);
  display: flex;
  align-items: baseline;
  gap: var(--space-3);
}
.reader-section-heading:first-of-type { margin-top: 0; }
.reader-section-num {
  font-variant-numeric: tabular-nums;
  color: var(--color-primary);
  font-weight: 800;
  min-width: 1.5rem;
}
.reader-section-heading--refs {
  margin-top: var(--space-12);
  font-size: 0.9375rem;
}
.reader-code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 0.88em;
  padding: 0.1em 0.35em;
  border-radius: var(--radius-sm);
  background: var(--color-surface-offset);
  border: 1px solid var(--color-border);
}

.reader-figure {
  margin: var(--space-10) 0;
}
.reader-figure-placeholder {
  aspect-ratio: 16 / 9;
  max-height: 220px;
  border-radius: var(--radius-lg);
  border: 1px dashed var(--color-border);
  background: repeating-linear-gradient(
    -12deg,
    var(--color-surface-offset),
    var(--color-surface-offset) 12px,
    color-mix(in oklch, var(--color-surface) 70%, var(--color-border)) 12px,
    color-mix(in oklch, var(--color-surface) 70%, var(--color-border)) 24px
  );
}
.reader-figure-cap {
  margin-top: var(--space-3);
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  line-height: 1.5;
  font-family: var(--font-body);
}

.reader-infra {
  margin-top: var(--space-12);
  padding: var(--space-6);
  border-radius: var(--radius-xl);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
}
.reader-infra--inline { margin-top: var(--space-10); }
.reader-infra-title {
  font-size: 0.625rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-text-faint);
  margin-bottom: var(--space-4);
}
.reader-infra-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
  gap: var(--space-4);
  font-size: 0.875rem;
}
.reader-infra-grid--tight { grid-template-columns: repeat(3, 1fr); }
.reader-infra-grid dt {
  font-size: 0.5625rem;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--color-text-faint);
  font-weight: 600;
  margin-bottom: var(--space-1);
}
.reader-infra-grid dd { font-weight: 500; }
.metric-value--good { color: var(--color-success); }
.metric-value--warn { color: var(--color-primary); }

.reader-refs { margin-top: var(--space-12); padding-top: var(--space-8); border-top: 1px solid var(--color-divider); }
.reader-refs-list {
  padding-left: 1.25rem;
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  line-height: 1.65;
}
.reader-refs-list li { margin-bottom: var(--space-3); }

.reader-rail {
  padding: var(--space-6) var(--space-5);
  background: var(--color-bg);
  position: sticky;
  top: calc(var(--nav-h) + 2px);
  align-self: start;
  height: calc(100dvh - var(--nav-h) - 2px);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}
.reader-split-handle {
  position: relative;
  align-self: stretch;
  width: var(--reader-split-width, 12px);
  z-index: 5;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: col-resize;
  touch-action: none;
  background: transparent;
  border: none;
  padding: 0;
  margin: 0;
}
.reader-split-handle::before {
  content: "";
  position: absolute;
  inset: 0;
  width: 1px;
  margin-inline: auto;
  background: var(--color-divider);
  opacity: 0;
  transition: opacity var(--transition);
}
.reader-split-handle:hover::before,
.reader-split-handle:focus-visible::before,
body.reader-rail-resizing .reader-split-handle::before {
  opacity: 1;
}
.reader-split-handle-grip {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 1.1rem;
  height: 1.75rem;
  border-radius: var(--radius-full);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-text-muted);
  box-shadow: 0 2px 8px color-mix(in oklch, var(--color-bg) 55%, transparent);
  opacity: 0;
  transition: opacity var(--transition), border-color var(--transition), color var(--transition);
  pointer-events: none;
}
.reader-split-handle-grip::before {
  content: "‹›";
  font-size: 0.62rem;
  font-weight: 700;
  letter-spacing: -0.12em;
  line-height: 1;
}
.reader-split-handle:hover .reader-split-handle-grip,
.reader-split-handle:focus-visible .reader-split-handle-grip,
body.reader-rail-resizing .reader-split-handle-grip {
  opacity: 1;
  border-color: color-mix(in oklch, var(--color-primary) 45%, var(--color-border));
  color: var(--color-primary);
}
body.reader-rail-resizing,
body.reader-rail-resizing * {
  cursor: col-resize !important;
  user-select: none !important;
}
.reader-rail-block { margin-bottom: var(--space-8); }
.reader-rail-block:last-child { margin-bottom: 0; }
.reader-rail-title {
  font-size: 0.625rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-text-faint);
  margin-bottom: var(--space-3);
}
.reader-rail-hint {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  margin-bottom: var(--space-3);
  line-height: 1.45;
}
.reader-notes {
  width: 100%;
  min-height: 200px;
  padding: var(--space-3);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-text);
  resize: vertical;
  line-height: 1.5;
  font-size: 0.875rem;
}
.reader-notes:focus {
  border-color: var(--color-primary);
  outline: none;
}
.reader-clear-notes {
  margin-top: var(--space-3);
  padding: var(--space-2) var(--space-3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text-muted);
  font-size: 0.75rem;
  font-weight: 600;
}
.reader-clear-notes:hover {
  color: var(--color-primary);
  border-color: var(--color-primary);
}
.reader-note-actions {
  margin-top: var(--space-3);
  display: flex;
  gap: var(--space-2);
  flex-wrap: wrap;
}
.reader-note-actions .reader-clear-notes {
  margin-top: 0;
}
.reader-rail-block.reader-ai-chat {
  display: flex;
  flex-direction: column;
  flex: 1 1 0;
  min-height: 0;
  margin-bottom: 0;
  overflow: hidden;
}
.reader-rail-block.reader-ai-chat:last-child {
  margin-bottom: 0;
}
.reader-ai-chat-header {
  flex-shrink: 0;
}
.reader-ai-chat-header-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
}
.reader-ai-close {
  display: none;
  padding: var(--space-1) var(--space-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  font-size: 0.68rem;
  font-weight: 600;
  color: var(--color-text-muted);
}
.reader-ai-close:hover {
  color: var(--color-text);
  background: var(--color-surface-offset);
}
.reader-ai-backdrop {
  position: fixed;
  inset: 0;
  z-index: 35;
  border: none;
  background: color-mix(in oklch, var(--color-bg) 28%, transparent);
  backdrop-filter: blur(2px);
}
.reader-ai-backdrop[hidden] {
  display: none;
}
.reader-ai-messages {
  flex: 1 1 0;
  min-height: 0;
  margin-bottom: var(--space-3);
  overflow-y: auto;
  overscroll-behavior: contain;
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  padding: var(--space-2) var(--space-1);
}
.reader-ai-message {
  max-width: 92%;
  padding: var(--space-3);
  border-radius: 1rem;
  font-size: 0.82rem;
  line-height: 1.55;
  white-space: normal;
  word-break: break-word;
}
.reader-ai-message p,
.reader-ai-message ol,
.reader-ai-message ul,
.reader-ai-message h3,
.reader-ai-message h4,
.reader-ai-message h5,
.reader-ai-message h6 {
  margin: 0;
}
.reader-ai-message h3 {
  font-size: 0.96rem;
  font-weight: 650;
  line-height: 1.35;
}
.reader-ai-message h4 {
  font-size: 0.9rem;
  font-weight: 650;
  line-height: 1.35;
}
.reader-ai-message h5,
.reader-ai-message h6 {
  font-size: 0.84rem;
  font-weight: 650;
  line-height: 1.35;
}
.reader-ai-message p + p,
.reader-ai-message p + ol,
.reader-ai-message p + ul,
.reader-ai-message p + h3,
.reader-ai-message p + h4,
.reader-ai-message p + h5,
.reader-ai-message p + h6,
.reader-ai-message h3 + p,
.reader-ai-message h4 + p,
.reader-ai-message h5 + p,
.reader-ai-message h6 + p,
.reader-ai-message h3 + ol,
.reader-ai-message h3 + ul,
.reader-ai-message h4 + ol,
.reader-ai-message h4 + ul,
.reader-ai-message ol + p,
.reader-ai-message ul + p,
.reader-ai-message ol + ol,
.reader-ai-message ul + ul,
.reader-ai-message ol + h3,
.reader-ai-message ol + h4,
.reader-ai-message ul + h3,
.reader-ai-message ul + h4 {
  margin-top: var(--space-3);
}
.reader-ai-message ol,
.reader-ai-message ul {
  padding-left: 1.25rem;
}
.reader-ai-message-table-wrap {
  overflow-x: auto;
}
.reader-ai-message table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.76rem;
  line-height: 1.4;
}
.reader-ai-message th,
.reader-ai-message td {
  border: 1px solid var(--color-border);
  padding: 0.35rem 0.45rem;
  text-align: left;
  vertical-align: top;
}
.reader-ai-message th {
  background: var(--color-surface-offset);
  font-weight: 650;
}
.reader-ai-message p + .reader-ai-message-table-wrap,
.reader-ai-message h3 + .reader-ai-message-table-wrap,
.reader-ai-message h4 + .reader-ai-message-table-wrap,
.reader-ai-message ul + .reader-ai-message-table-wrap,
.reader-ai-message ol + .reader-ai-message-table-wrap,
.reader-ai-message .reader-ai-message-table-wrap + p,
.reader-ai-message .reader-ai-message-table-wrap + h3,
.reader-ai-message .reader-ai-message-table-wrap + h4 {
  margin-top: var(--space-3);
}
.reader-ai-message code {
  font-size: 0.78rem;
  padding: 0.08rem 0.25rem;
  border-radius: 0.3rem;
  background: color-mix(in oklch, var(--color-text) 8%, transparent);
}
.reader-ai-message .katex {
  font-size: 1.02em;
  color: var(--color-text);
}
.reader-ai-message .katex-display {
  margin: var(--space-2) 0;
  overflow-x: auto;
  overflow-y: hidden;
}
.reader-ai-message--user {
  align-self: flex-end;
  border-bottom-right-radius: 0.35rem;
  background: color-mix(in oklch, var(--color-primary) 16%, var(--color-surface));
  border: 1px solid color-mix(in oklch, var(--color-primary) 24%, var(--color-border));
}
.reader-ai-message--assistant {
  align-self: flex-start;
  border-bottom-left-radius: 0.35rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
}
.reader-ai-message--assistant.has-model-info {
  position: relative;
  padding-top: calc(var(--space-3) + 0.1rem);
  padding-right: calc(var(--space-3) + 1.35rem);
}
.reader-ai-message-info-wrap {
  position: absolute;
  top: 0.4rem;
  right: 0.4rem;
  z-index: 2;
}
.reader-ai-message-info {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.35rem;
  height: 1.35rem;
  border-radius: var(--radius-full);
  color: var(--color-text-faint);
}
.reader-ai-message-info:hover,
.reader-ai-message-info[aria-expanded="true"] {
  color: var(--color-text);
  background: var(--color-surface-offset);
}
.reader-ai-message-info-popover {
  position: absolute;
  top: calc(100% + 0.35rem);
  right: 0;
  z-index: 3;
  min-width: 10rem;
  max-width: 14rem;
  padding: 0.55rem 0.65rem;
  border: 1px solid var(--color-border);
  border-radius: 0.65rem;
  background: var(--color-surface);
  box-shadow: 0 10px 24px color-mix(in oklch, var(--color-bg) 78%, transparent);
}
.reader-ai-message-info-popover[hidden] {
  display: none;
}
.reader-ai-message-info-title {
  margin: 0 0 0.2rem;
  font-size: 0.62rem;
  font-weight: 650;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-text-faint);
}
.reader-ai-message-info-label {
  margin: 0;
  font-size: 0.78rem;
  font-weight: 650;
  color: var(--color-text);
}
.reader-ai-message-info-id {
  margin: 0.25rem 0 0;
  font-size: 0.65rem;
  line-height: 1.35;
  color: var(--color-text-faint);
  word-break: break-word;
}
.reader-ai-message-info-premium {
  display: inline-block;
  margin-top: 0.35rem;
  padding: 0.08rem 0.35rem;
  border: 1px solid color-mix(in oklch, var(--color-primary) 42%, var(--color-border));
  border-radius: var(--radius-full);
  font-size: 0.62rem;
  font-weight: 650;
  color: var(--color-primary);
}
.reader-ai-message.is-loading {
  color: var(--color-text-faint);
}
.reader-ai-message.is-error {
  border-color: color-mix(in oklch, var(--color-primary) 45%, var(--color-border));
  color: var(--color-primary);
}
.reader-ai-composer {
  flex-shrink: 0;
  padding: var(--space-2) var(--space-3);
  border: 1px solid var(--color-border);
  border-radius: 1.1rem;
  background: var(--color-surface);
}
.reader-ai-composer:focus-within {
  border-color: color-mix(in oklch, var(--color-primary) 45%, var(--color-border));
}
.reader-ai-composer-row {
  display: flex;
  align-items: flex-end;
  gap: var(--space-2);
}
.reader-ai-composer-input {
  flex: 1 1 auto;
  min-width: 0;
  width: auto;
  border: none;
  background: transparent;
  color: var(--color-text);
  resize: none;
  min-height: 1.4rem;
  max-height: 8rem;
  line-height: 1.5;
  font-size: 0.86rem;
}
.reader-ai-send {
  display: none;
  flex-shrink: 0;
  width: 36px;
  height: 36px;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-full);
  background: var(--color-primary);
  color: #fff;
}
.reader-ai-send:hover:not(:disabled) {
  background: var(--color-primary-hover);
}
.reader-ai-send:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}
.reader-ai-composer-input:focus {
  outline: none;
}
.reader-ai-composer-input:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}
.reader-ai-composer-footer {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: var(--space-2);
  margin-top: var(--space-2);
}
.reader-ai-composer-hint {
  display: none;
  margin: 0;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-size: 0.68rem;
  color: var(--color-text-faint);
}
.reader-ai-model-menu {
  position: relative;
  flex-shrink: 0;
}
.reader-ai-model-toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  max-width: 10.5rem;
  min-height: 1.85rem;
  padding: 0.25rem 0.5rem 0.25rem 0.62rem;
  border: 1px solid color-mix(in oklch, var(--color-border) 80%, transparent);
  border-radius: var(--radius-full);
  background: color-mix(in oklch, var(--color-surface-offset) 42%, transparent);
  color: var(--color-text-muted);
  font-size: 0.72rem;
  line-height: 1;
}
.reader-ai-model-toggle:hover:not(:disabled),
.reader-ai-model-toggle[aria-expanded="true"] {
  border-color: color-mix(in oklch, var(--color-primary) 42%, var(--color-border));
  color: var(--color-text);
  background: var(--color-surface-offset);
}
.reader-ai-model-toggle:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}
.reader-ai-model-name {
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.reader-ai-model-detail,
.reader-ai-model-option-detail,
.reader-ai-model-premium {
  color: var(--color-text-faint);
}
.reader-ai-model-list {
  position: absolute;
  right: 0;
  bottom: calc(100% + var(--space-2));
  z-index: 70;
  width: min(14rem, calc(100vw - 2rem));
  max-height: 15rem;
  overflow-y: auto;
  padding: 0.35rem;
  border: 1px solid var(--color-border);
  border-radius: 0.9rem;
  background: color-mix(in oklch, var(--color-surface) 94%, var(--color-bg));
  box-shadow: 0 16px 32px color-mix(in oklch, var(--color-bg) 78%, transparent);
}
.reader-ai-model-list[hidden] {
  display: none;
}
.reader-ai-model-option {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  width: 100%;
  padding: 0.55rem 0.65rem;
  border-radius: 0.65rem;
  text-align: left;
  color: var(--color-text);
}
.reader-ai-model-option:hover:not(:disabled),
.reader-ai-model-option.is-selected {
  background: var(--color-surface-offset);
}
.reader-ai-model-option.is-selected {
  box-shadow: inset 2px 0 0 var(--color-primary);
}
.reader-ai-model-option:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}
.reader-ai-model-option-header {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  min-width: 0;
  font-size: 0.78rem;
  font-weight: 650;
}
.reader-ai-model-option-name {
  min-width: 0;
  flex: 1 1 auto;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.reader-ai-model-option-detail,
.reader-ai-model-premium {
  flex-shrink: 0;
  font-size: 0.65rem;
  font-weight: 600;
}
.reader-ai-model-option-detail {
  padding-left: 0.25rem;
  color: var(--color-text-faint);
}
.reader-ai-model-premium {
  padding: 0.08rem 0.35rem;
  border: 1px solid color-mix(in oklch, var(--color-primary) 42%, var(--color-border));
  border-radius: var(--radius-full);
  color: var(--color-primary);
}
.reader-ai-model-option-meta {
  display: block;
  color: var(--color-text-faint);
  font-size: 0.68rem;
  line-height: 1.35;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.reader-highlight-mark {
  background: color-mix(in oklch, var(--color-primary) 24%, transparent);
  color: inherit;
  padding: 0.03em 0.08em;
  border-radius: 0.2em;
}
.reader-context-menu {
  position: fixed;
  z-index: 100;
  min-width: 11rem;
  padding: var(--space-1);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  box-shadow: 0 12px 24px color-mix(in oklch, var(--color-bg) 78%, transparent);
}
.reader-context-menu-item {
  width: 100%;
  text-align: left;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
  color: var(--color-text);
}
.reader-context-menu-item:hover {
  background: var(--color-surface-offset);
  color: var(--color-primary);
}
.reader-context-menu-item:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

.reader-footer {
  max-width: 1440px;
  margin-inline: auto;
  padding: var(--space-8) var(--space-6);
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  align-items: center;
  justify-content: space-between;
  font-size: 0.75rem;
  color: var(--color-text-faint);
}
.reader-footer nav { display: flex; gap: var(--space-5); }
.reader-footer a {
  color: var(--color-text-muted);
  text-decoration: none;
}
.reader-footer a:hover { color: var(--color-text); }

.about-page .reader-nav-inner {
  justify-content: space-between;
}
.about-main {
  max-width: 960px;
  margin-inline: auto;
  padding: var(--space-10) var(--space-6) var(--space-12);
}
.about-layout {
  display: grid;
  grid-template-columns: minmax(0, 18rem) minmax(0, 1fr);
  gap: var(--space-10);
  align-items: start;
}
.about-photo {
  margin: 0;
}
.about-photo img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
}
.about-copy {
  font-family: var(--font-reading);
  font-size: 1.0625rem;
  line-height: 1.75;
  color: var(--color-text);
}
.about-copy p {
  margin-bottom: var(--space-5);
}
.about-copy p:last-child {
  margin-bottom: 0;
}
@media (max-width: 768px) {
  .about-main {
    padding: var(--space-8) var(--space-4) var(--space-10);
  }
  .about-layout {
    grid-template-columns: 1fr;
    gap: var(--space-8);
  }
  .about-photo {
    max-width: 16rem;
  }
}

.swipe-home[hidden],
#reader-app[hidden] {
  display: none !important;
}
.swipe-home {
  min-height: 100svh;
  display: flex;
  justify-content: center;
  align-items: stretch;
  padding: var(--space-4) var(--space-6);
  background: radial-gradient(circle at top, color-mix(in oklch, var(--color-primary) 14%, transparent), transparent 45%), var(--color-bg);
}
.swipe-home-inner {
  width: min(100%, 30rem);
  height: calc(100svh - (var(--space-4) * 2) - var(--space-4));
  min-height: 0;
  display: grid;
  grid-template-rows: auto auto auto auto 1fr auto;
  gap: var(--space-3);
}
.swipe-home-kicker {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-primary);
}
.swipe-home-title {
  font-family: var(--font-display);
  font-size: clamp(1.35rem, 1.55vw, 1.75rem);
  line-height: 1.08;
  letter-spacing: -0.02em;
}
.swipe-home-subtitle {
  color: var(--color-text-muted);
  font-size: 0.92rem;
}
.swipe-home-meta {
  display: flex;
  justify-content: space-between;
  gap: var(--space-4);
  font-size: 0.78rem;
  color: var(--color-text-faint);
}
.swipe-card {
  position: relative;
  height: auto;
  min-height: 0;
  flex: 1 1 auto;
  padding: var(--space-6);
  border-radius: var(--radius-xl);
  border: 1px solid var(--color-border);
  background: linear-gradient(165deg, color-mix(in oklch, var(--color-surface) 88%, var(--color-primary) 12%), var(--color-surface-2));
  box-shadow: 0 18px 40px color-mix(in oklch, var(--color-bg) 70%, transparent);
  transform-origin: center;
  transition: transform 140ms ease, opacity 140ms ease;
  touch-action: pan-y;
  user-select: none;
  display: flex;
  flex-direction: column;
}
.swipe-card-type {
  font-size: 0.66rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-primary);
}
.swipe-card-title {
  margin-top: var(--space-2);
  font-family: var(--font-body);
  font-size: clamp(1.12rem, 0.98rem + 0.65vw, 1.35rem);
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.02em;
}
.swipe-card-meta {
  margin-top: var(--space-2);
  font-size: 0.78rem;
  color: var(--color-text-faint);
}
.swipe-card-summary {
  margin-top: var(--space-4);
  color: var(--color-text-muted);
  line-height: 1.55;
  flex: 1 1 auto;
  overflow: auto;
  padding-right: var(--space-1);
  -webkit-overflow-scrolling: touch;
  overscroll-behavior: contain;
  touch-action: pan-y;
}
.swipe-card-badge {
  position: absolute;
  /* Float badges just above card so they do not cover title text. */
  top: calc(var(--space-4) * -1);
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  border: 1px solid var(--color-border);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  opacity: 0;
  pointer-events: none;
  z-index: 2;
}
.swipe-card-badge--left {
  left: var(--space-4);
  color: #ff6a6a;
  border-color: color-mix(in oklch, #ff6a6a 55%, var(--color-border));
}
.swipe-card-badge--right {
  right: var(--space-4);
  color: var(--color-success);
  border-color: color-mix(in oklch, var(--color-success) 55%, var(--color-border));
}
.swipe-home-empty {
  font-size: 0.82rem;
  color: var(--color-text-muted);
  border: 1px dashed var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-3);
}
.swipe-home-actions {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-2);
}
.swipe-action {
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-full);
  border: 1px solid var(--color-border);
  font-size: 0.82rem;
  font-weight: 700;
}
.swipe-action:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}
.swipe-action--skip:hover {
  border-color: #ff6a6a;
  color: #ff6a6a;
}
.swipe-action--like {
  background: color-mix(in oklch, var(--color-success) 24%, transparent);
  border-color: color-mix(in oklch, var(--color-success) 55%, var(--color-border));
}
.swipe-action--like:hover {
  color: var(--color-success);
}
.swipe-action--open {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: #fff;
}
.swipe-action--open:hover {
  background: var(--color-primary-hover);
  border-color: var(--color-primary-hover);
}

/* Focus mode */
body.reader-body.reader-focus .reader-shelf,
body.reader-body.reader-focus .reader-toc-slot,
body.reader-body.reader-focus .reader-issue-chip {
  display: none;
}
body.reader-body.reader-focus .reader-layout {
  grid-template-columns: minmax(0, 1fr) var(--reader-split-width, 12px) var(--reader-rail-width, var(--focus-rail-width));
}
body.reader-body.reader-focus .reader-doc-grid {
  grid-template-columns: 1fr;
  border-inline: none;
}
body.reader-body.reader-focus .reader-rail {
  border-left: 1px solid var(--color-divider);
  height: calc(100dvh - var(--nav-h) - 2px);
}
body.reader-body.reader-focus .reader-rail .reader-rail-block.reader-ai-chat {
  margin-bottom: 0;
  flex: 1 1 0;
  min-height: 0;
}
body.reader-body.reader-focus .reader-ai-composer-footer {
  justify-content: space-between;
}
body.reader-body.reader-focus .reader-ai-composer-hint {
  display: block;
}
body.reader-body.reader-focus .reader-ai-model-list {
  width: min(17rem, calc(100vw - 2rem));
}
body.reader-body.reader-focus .reader-main {
  padding-inline: var(--space-6);
}
body.reader-body.reader-focus .reader-paper {
  max-width: 46rem;
}
body.reader-body.reader-focus .reader-paper.is-pdf-view {
  max-width: min(98vw, 90rem);
}
body.reader-body.reader-focus.reader-pdf-mode .reader-main {
  padding-top: 0;
  padding-bottom: 0;
}

@keyframes reader-fade-in {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

@media (max-width: 1100px) {
  .reader-layout {
    grid-template-columns: minmax(0, 1fr) var(--reader-split-width, 12px) var(--reader-rail-width, var(--rail-width));
    grid-template-rows: auto 1fr;
  }
  .reader-shelf {
    grid-column: 1 / -1;
    grid-row: 1;
    border-right: none;
    border-bottom: 1px solid var(--color-divider);
    position: static;
    max-height: none;
  }
  .reader-shelf-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  }
  .reader-doc-grid {
    grid-column: 1;
    grid-row: 2;
  }
  .reader-split-handle {
    grid-column: 2;
    grid-row: 2;
  }
  .reader-rail {
    grid-column: 3;
    grid-row: 2;
    border-left: 1px solid var(--color-divider);
    position: relative;
    height: auto;
    min-height: min(72dvh, 640px);
    max-height: none;
    overflow: hidden;
  }
  .reader-rail-block.reader-ai-chat {
    min-height: min(68dvh, 600px);
  }
}

@media (max-width: 860px) {
  .reader-split-handle {
    display: none;
  }
  .reader-layout {
    grid-template-columns: 1fr;
  }
  .reader-doc-grid {
    grid-template-columns: 1fr;
  }
  .reader-toc-slot {
    display: none;
  }
  .reader-ai-mobile-toggle {
    display: inline-flex;
    align-items: center;
  }
  .reader-settings-toggle {
    display: inline-flex;
  }
  .reader-nav-settings {
    position: relative;
  }
  .reader-settings-panel {
    display: none;
    position: absolute;
    top: calc(100% + var(--space-2));
    right: 0;
    z-index: 50;
    flex-direction: column;
    align-items: stretch;
    gap: var(--space-3);
    min-width: min(16rem, calc(100vw - var(--space-6)));
    padding: var(--space-3);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    background: var(--color-surface);
    box-shadow: 0 18px 48px rgba(0, 0, 0, 0.18);
  }
  body.reader-body.reader-settings-open .reader-settings-panel {
    display: flex;
  }
  .reader-settings-item {
    flex-direction: column;
    align-items: stretch;
    gap: var(--space-2);
  }
  .reader-settings-label {
    display: block;
  }
  .reader-settings-item .reader-auth {
    width: 100%;
  }
  .reader-settings-item .reader-auth-panel {
    position: static;
    width: 100%;
    margin-top: var(--space-2);
    padding: 0;
    border: none;
    border-radius: 0;
    box-shadow: none;
    background: transparent;
  }
  .reader-settings-item .reader-auth-form,
  .reader-settings-item .reader-auth-session {
    width: 100%;
  }
  .reader-settings-panel .reader-auth-input {
    font-size: 16px;
  }
  .reader-shelf-toggle {
    display: inline-flex;
    align-items: center;
  }
  .reader-ai-close {
    display: inline-flex;
    align-items: center;
  }
  .reader-shelf-close {
    display: inline-flex;
    align-items: center;
  }
  .reader-shelf {
    position: fixed;
    top: calc(var(--nav-h) + 2px);
    left: 0;
    bottom: auto;
    height: calc(100svh - var(--nav-h) - 2px);
    max-height: calc(100svh - var(--nav-h) - 2px);
    z-index: 55;
    width: min(88vw, 22rem);
    max-width: calc(100vw - var(--space-4));
    align-self: auto;
    grid-column: unset;
    grid-row: unset;
    border-right: 1px solid var(--color-divider);
    border-bottom: none;
    box-shadow: 16px 0 48px color-mix(in oklch, var(--color-bg) 72%, transparent);
    transform: translateX(calc(-100% - 1px));
    transition: transform var(--transition), visibility var(--transition);
    visibility: hidden;
    padding: var(--space-4) var(--space-3);
    padding-bottom: calc(var(--space-4) + env(safe-area-inset-bottom));
    display: flex;
    flex-direction: column;
    overflow: hidden;
    overscroll-behavior: contain;
  }
  body.reader-body.reader-shelf-open .reader-shelf {
    transform: translateX(0);
    visibility: visible;
  }
  .reader-shelf-head {
    flex-shrink: 0;
  }
  .reader-shelf-list {
    display: flex;
    flex-direction: column;
    grid-template-columns: unset;
    flex: 1 1 0;
    min-height: 0;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
    overscroll-behavior: contain;
  }
  .reader-rail {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    top: auto;
    z-index: 40;
    grid-column: unset;
    grid-row: unset;
    width: 100%;
    min-height: 0;
    height: min(74dvh, 680px);
    max-height: calc(100dvh - var(--nav-h) - env(safe-area-inset-bottom));
    padding: var(--space-4) var(--space-3) calc(var(--space-4) + env(safe-area-inset-bottom));
    border-left: none;
    border-top: 1px solid var(--color-divider);
    box-shadow: 0 -16px 48px color-mix(in oklch, var(--color-bg) 72%, transparent);
    transform: translateY(calc(100% + 1px));
    transition: transform var(--transition), visibility var(--transition);
    visibility: hidden;
    overflow: hidden;
  }
  body.reader-body.reader-ai-open .reader-rail {
    transform: translateY(0);
    visibility: visible;
    display: flex;
    flex-direction: column;
  }
  body.reader-body.reader-ai-keyboard-open .reader-ai-chat-header .reader-rail-hint {
    display: none;
  }
  .reader-ai-composer {
    flex-shrink: 0;
    padding: var(--space-2) var(--space-3);
  }
  .reader-ai-composer-row {
    align-items: center;
  }
  .reader-ai-composer-input {
    padding: 0;
    min-height: 1.25rem;
    line-height: 1.4;
    font-size: 16px;
  }
  .reader-ai-send {
    display: inline-flex;
  }
  .reader-ai-composer-hint {
    display: none;
  }
  .reader-rail-block.reader-ai-chat {
    height: 100%;
    min-height: 0;
  }
  .reader-ai-chat-header {
    margin-bottom: var(--space-2);
    padding-bottom: var(--space-2);
    border-bottom: 1px solid var(--color-divider);
  }
  .reader-nav-meta { display: none; }
  .reader-focus-toggle { display: none; }
  .reader-infra-grid--tight { grid-template-columns: 1fr; }
  .reader-overview-actions {
    grid-column: 1 / -1;
    justify-self: start;
  }
  .reader-overview-cta { justify-self: start; }
  .reader-overview-cta--secondary { justify-self: start; }
}

@media (max-width: 640px) {
  .reader-nav-inner,
  .reader-issue-bar,
  .reader-main,
  .reader-rail,
  .reader-shelf,
  .reader-footer {
    padding-inline: var(--space-3);
  }
  .reader-nav-inner {
    gap: var(--space-2);
  }
  .reader-nav-brand span {
    font-size: 0.95rem;
  }
  .reader-nav-tools {
    gap: var(--space-1);
  }
  .reader-font-btn {
    padding: var(--space-1) var(--space-2);
  }
  .theme-toggle {
    width: 32px;
    height: 32px;
  }
  .reader-issue-bar {
    grid-template-columns: 1fr;
    gap: var(--space-3);
  }
  .reader-overview-actions {
    justify-self: start;
    width: 100%;
  }
  .reader-overview-cta,
  .reader-overview-cta--secondary {
    justify-self: start;
  }
  .reader-layout {
    min-height: auto;
  }
  .reader-shelf-list {
    grid-template-columns: 1fr;
  }
  .reader-main {
    padding-top: var(--space-6);
    padding-bottom: var(--space-8);
  }
  .reader-paper-title {
    margin-top: var(--space-2);
  }
  .reader-abstract {
    padding: var(--space-4);
  }
  .reader-notes {
    min-height: 140px;
  }
  .swipe-home {
    min-height: 100svh;
    padding: var(--space-3) var(--space-3) calc(var(--space-3) + env(safe-area-inset-bottom));
  }
  .swipe-home-inner {
    width: 100%;
    height: calc(100svh - (var(--space-3) * 2) - env(safe-area-inset-bottom) - var(--space-3));
    min-height: 0;
    display: grid;
    grid-template-rows: auto auto auto auto 1fr auto;
    gap: var(--space-2);
  }
  .swipe-home-actions {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    position: relative;
    z-index: 2;
    padding-top: var(--space-2);
    background: linear-gradient(to top, var(--color-bg), color-mix(in oklch, var(--color-bg) 70%, transparent));
  }
  .swipe-action {
    padding: var(--space-2);
    font-size: 0.78rem;
  }
  .swipe-card {
    padding: var(--space-4);
    height: auto;
    min-height: 0;
    flex: 1 1 auto;
  }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}