:root {
  --paper: #edf8f9;
  --paper-deep: #dceff2;
  --ink: #29424a;
  --muted: #718b91;
  --line: rgba(69, 58, 46, 0.14);
  --accent: #86a8c9;
  --accent-dark: #688cac;
  --glow-a: #c7edf2;
  --glow-b: #d9e5f5;
  --ai: #dc8b96;
  --human: #75ad91;
  --reading-paper: #fffefa;
  --reading-ink: #2f302e;
  --shadow: 0 18px 50px rgba(63, 48, 32, 0.12);
  --serif: "Noto Serif SC", "Source Han Serif SC", "Songti SC", SimSun, serif;
  --sans: Inter, "PingFang SC", "Microsoft YaHei", sans-serif;
  --reader-font: var(--serif);
  --reader-font-size: 20px;
  --reader-line-height: 2;
}

* { box-sizing: border-box; }

html {
  -webkit-tap-highlight-color: transparent;
}

html, body {
  margin: 0;
  min-height: 100%;
  color: var(--ink);
  background: var(--paper);
  font-family: var(--sans);
}

body {
  -webkit-user-select: none;
  user-select: none;
  -webkit-touch-callout: none;
}

input,
textarea,
[contenteditable="true"],
.chapter-text,
.chapter-text * {
  -webkit-user-select: text;
  user-select: text;
}

.chapter-text ::selection {
  color: inherit;
  background: color-mix(in srgb, var(--accent) 30%, transparent);
}

button,
a,
label,
select,
[role="button"] {
  -webkit-tap-highlight-color: transparent;
  -webkit-touch-callout: none;
}

button:focus:not(:focus-visible),
[role="button"]:focus:not(:focus-visible) {
  outline: none;
}

img,
svg {
  -webkit-user-drag: none;
}

button, input, textarea, select { font: inherit; }
button { cursor: pointer; }

.desk {
  min-height: 100vh;
  padding: 0 0 54px;
  background:
    radial-gradient(circle at 10% 0%, rgba(201, 103, 73, .10), transparent 30%),
    linear-gradient(180deg, color-mix(in srgb, var(--paper) 82%, white) 0%, var(--paper) 100%);
}

.desk-header {
  position: sticky;
  top: 0;
  z-index: 20;
  min-height: 58px;
  margin: 0;
  padding: 9px 28px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 24px;
  border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, var(--paper) 92%, transparent);
  backdrop-filter: blur(12px);
}

.desk-brand {
  display: flex;
  align-items: center;
  gap: 10px;
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--accent);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .18em;
}

h1 {
  margin: 0;
  font-family: var(--serif);
  font-weight: 700;
  font-size: 17px;
  letter-spacing: .08em;
}

.subtitle {
  margin: 10px 0 0;
  color: var(--muted);
  font-family: var(--serif);
  font-size: 13px;
  line-height: 1.7;
}

.book-count {
  padding: 3px 9px;
  border-radius: 999px;
  color: var(--accent);
  background: color-mix(in srgb, var(--accent) 13%, transparent);
  font-size: 11px;
  font-weight: 700;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 14px;
}

.theme-control {
  display: flex;
  align-items: center;
  gap: 7px;
  color: var(--muted);
  font-size: 12px;
}
.theme-control select {
  min-height: 36px;
  padding: 0 28px 0 11px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--ink);
  background: rgba(255,255,255,.5);
}

.connection {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  color: var(--muted);
  font-size: 13px;
}

.connection i {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #d2a348;
}

.connection.online i { background: #4d9b70; }
.connection.offline i { background: #bd554a; }

.primary, .ghost {
  min-height: 42px;
  padding: 0 18px;
  border-radius: 999px;
  border: 1px solid transparent;
  transition: .18s ease;
}

.primary {
  color: white;
  background: var(--ink);
}

.primary:hover { background: var(--accent-dark); transform: translateY(-1px); }

.ghost {
  color: var(--ink);
  background: rgba(255,255,255,.45);
  border-color: var(--line);
}

.ghost:hover { background: white; }
.small { min-height: 34px; padding: 0 13px; font-size: 13px; }

.reminder-list {
  border-bottom: 1px solid var(--line);
}
.reading-reminder {
  min-height: 46px;
  padding: 7px 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  color: var(--ink);
  background: color-mix(in srgb, var(--accent) 11%, transparent);
  font-family: var(--serif);
  font-size: 13px;
}
.reading-reminder + .reading-reminder { border-top: 1px solid var(--line); }

.desk-summary {
  padding: 14px 28px;
  display: flex;
  gap: 30px;
  border-bottom: 1px solid var(--line);
}
.desk-summary div { display: grid; gap: 2px; }
.desk-summary strong { color: var(--accent); font-size: 18px; }
.desk-summary span { color: var(--muted); font-size: 11px; }

.book-grid {
  max-width: 1320px;
  margin: 0 auto;
  padding: 22px 28px;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(178px, 1fr));
  gap: 18px;
}

.book-card {
  position: relative;
  min-height: 228px;
  padding: 18px 16px 14px 20px;
  border: 1px solid rgba(86, 65, 45, .10);
  border-radius: 7px 12px 12px 7px;
  color: #f9f4ea;
  background:
    linear-gradient(90deg, rgba(0,0,0,.18), transparent 8%),
    var(--cover, #7a5145);
  box-shadow: var(--shadow);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transform: translateY(0);
  transition: .2s ease;
}

.book-card:nth-child(4n+2) { --cover: #526d68; }
.book-card:nth-child(4n+3) { --cover: #77664d; }
.book-card:nth-child(4n+4) { --cover: #5c6074; }
.book-card:hover { transform: translateY(-5px); }
.book-card::after {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 80% 10%, rgba(255,255,255,.16), transparent 32%);
  pointer-events: none;
}

.book-status {
  position: relative;
  z-index: 1;
  width: fit-content;
  padding: 2px 7px;
  border-radius: 999px;
  color: rgba(255,255,255,.86);
  background: rgba(255,255,255,.14);
  font-size: 9px;
  font-weight: 700;
}
.book-status.done { background: rgba(122,162,126,.58); }

.book-card h2 {
  position: relative;
  z-index: 1;
  margin: 26px 0 6px;
  font-family: var(--serif);
  font-size: 18px;
  font-weight: 700;
  line-height: 1.35;
}

.book-author { position: relative; z-index: 1; opacity: .66; margin: 0; font-size: 11px; }
.book-meta { position: relative; z-index: 1; margin-top: auto; font-size: 11px; opacity: .86; }
.book-meta > span, .book-meta > small { display: block; }
.book-meta > small { margin-top: 3px; opacity: .7; }
.progress-track { height: 3px; background: rgba(255,255,255,.2); margin: 12px 0; }
.progress-track i { display: block; height: 100%; background: #fff; }
.progress-label { margin: -8px 0 8px; text-align: right; font-size: 9px; opacity: .72; }

.book-actions { position: relative; z-index: 2; display: flex; gap: 8px; }
.book-actions button {
  flex: 1;
  min-height: 32px;
  border: 1px solid rgba(255,255,255,.25);
  color: white;
  background: rgba(255,255,255,.10);
  border-radius: 8px;
  font-size: 10px;
}
.book-actions button:hover { background: rgba(255,255,255,.2); }
.book-actions .timeline { flex: 1.25; }
.book-actions .delete { flex: 0 0 38px; }

.empty-card {
  max-width: 620px;
  margin: 10vh auto 0;
  padding: 60px 28px;
  text-align: center;
  border: 1px dashed rgba(69,58,46,.25);
  border-radius: 24px;
}
.empty-icon { font-size: 48px; color: var(--accent); }
.empty-card h2 { font-family: var(--serif); font-weight: 500; font-size: 28px; margin: 12px 0 8px; }
.empty-card p { color: var(--muted); margin-bottom: 24px; }

.reader {
  min-height: 100vh;
  background: var(--paper);
}

.reader-bar {
  position: sticky;
  top: 0;
  z-index: 20;
  height: 72px;
  padding: 0 22px;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, var(--paper) 93%, transparent);
  backdrop-filter: blur(14px);
}

.reader-bar > :last-child { justify-self: end; }
.reader-title { text-align: center; display: flex; flex-direction: column; gap: 2px; }
.reader-title strong { font-family: var(--serif); font-size: 16px; }
.reader-title span { color: var(--muted); font-size: 12px; }
.reader-actions { display: flex; align-items: center; gap: 8px; }
.reader-actions .square { min-width: 44px; padding: 0 12px; font-family: var(--serif); }

.reading-settings {
  position: fixed;
  z-index: 45;
  top: 82px;
  right: 22px;
  width: min(360px, calc(100vw - 28px));
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: color-mix(in srgb, var(--paper) 94%, white);
  box-shadow: var(--shadow);
}
.reading-settings > header,
.timeline-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.reading-settings > header { margin-bottom: 18px; }
.reading-settings > header strong { font-family: var(--serif); font-size: 17px; }
.setting-group, .range-setting { display: grid; gap: 9px; margin-top: 15px; }
.setting-group > span, .range-setting > span { color: var(--muted); font-size: 12px; }
.font-options, .identity-options { display: flex; gap: 7px; }
.font-options button, .identity-options button {
  min-height: 38px;
  flex: 1;
  padding: 0 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--muted);
  background: rgba(255,255,255,.56);
}
.font-options button.active, .identity-options button.active {
  border-color: var(--accent);
  color: white;
  background: var(--accent);
}
.identity-options button[data-author="a2"].active,
.identity-options button[data-reply-author="a2"].active {
  border-color: var(--ai);
  background: var(--ai);
}
.range-setting input { width: 100%; accent-color: var(--accent); }
.range-setting output { color: var(--ink); font-weight: 700; }

.reader-layout {
  display: grid;
  grid-template-columns: 250px minmax(0, 760px) 330px;
  justify-content: center;
  min-height: calc(100vh - 72px);
}

.toc-panel, .annotation-panel {
  position: sticky;
  top: 72px;
  height: calc(100vh - 72px);
  overflow-y: auto;
  padding: 28px 20px;
  background: rgba(236,229,218,.55);
}

.toc-panel { border-right: 1px solid var(--line); }
.annotation-panel { border-left: 1px solid var(--line); }
.panel-title {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 18px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .08em;
}
.chapter-progress {
  color: var(--muted);
  font-size: 10px;
  font-weight: 400;
  letter-spacing: 0;
}
.count {
  min-width: 24px;
  padding: 3px 8px;
  border-radius: 99px;
  color: white;
  background: var(--accent);
  text-align: center;
  font-size: 11px;
}

.chapter-list { display: flex; flex-direction: column; gap: 4px; }
.chapter-list button {
  width: 100%;
  padding: 10px 12px;
  border: 0;
  border-radius: 10px;
  text-align: left;
  color: var(--muted);
  background: transparent;
  display: grid;
  gap: 3px;
}
.chapter-list button span {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-size: 13px;
  line-height: 1.45;
}
.chapter-list button small { color: var(--muted); font-size: 9px; }
.chapter-list button:hover:not(:disabled), .chapter-list button.active {
  color: var(--ink);
  background: rgba(255,255,255,.8);
}
.chapter-list button.active { box-shadow: inset 3px 0 0 var(--accent); }
.chapter-list button:disabled { opacity: .45; cursor: default; }

.reading-column {
  min-height: calc(100vh - 72px);
  padding: 64px clamp(28px, 6vw, 80px) 100px;
  background: rgba(255,255,255,.26);
}

.chapter-heading { margin: 0 0 48px; text-align: center; }
.chapter-heading p { color: var(--accent); font-size: 11px; letter-spacing: .18em; }
.chapter-heading h2 { margin: 8px 0 0; font-family: var(--serif); font-size: 30px; font-weight: 500; }

.chapter-text {
  font-family: var(--reader-font);
  font-size: var(--reader-font-size);
  line-height: var(--reader-line-height);
  letter-spacing: .035em;
}
.chapter-text p {
  margin: 0 0 1.1em;
  text-indent: 2em;
}
.chapter-text p:first-child { text-indent: 0; }
.chapter-text mark {
  color: inherit;
  background: linear-gradient(transparent 58%, rgba(201,103,73,.25) 58%);
  cursor: pointer;
}
.chapter-text mark.ai {
  background: linear-gradient(transparent 58%, rgba(88,117,143,.28) 58%);
}
.chapter-text mark.multi {
  background:
    linear-gradient(transparent 54%, color-mix(in srgb, var(--ai) 30%, transparent) 54% 72%, transparent 72%),
    linear-gradient(transparent 78%, color-mix(in srgb, var(--human) 34%, transparent) 78%);
  text-decoration: underline dotted color-mix(in srgb, var(--ink) 45%, transparent);
  text-underline-offset: 4px;
}
.chapter-text mark.active { outline: 2px solid rgba(201,103,73,.35); border-radius: 3px; }

.chapter-nav { display: flex; justify-content: space-between; gap: 18px; margin-top: 70px; }
.chapter-nav button:disabled { opacity: .35; cursor: default; transform: none; }

.annotation-list { display: flex; flex-direction: column; gap: 14px; }
.annotation-card {
  padding: 14px;
  border-radius: 13px;
  border: 1px solid var(--line);
  background: rgba(255,255,255,.65);
}
.annotation-card.selected { border-color: rgba(201,103,73,.55); box-shadow: 0 0 0 3px rgba(201,103,73,.08); }
.annotation-quote {
  margin: 0 0 12px;
  padding-left: 10px;
  border-left: 2px solid var(--accent);
  color: var(--muted);
  font-family: var(--serif);
  font-size: 13px;
  line-height: 1.55;
}
.thread { display: flex; flex-direction: column; gap: 10px; }
.thread-entry { padding-left: 10px; border-left: 2px solid var(--human); }
.thread-entry.ai { border-left-color: var(--ai); }
.thread-entry header { display: flex; justify-content: space-between; gap: 8px; margin-bottom: 4px; font-size: 11px; color: var(--muted); }
.thread-entry strong { color: var(--human); }
.thread-entry.ai strong { color: var(--ai); }
.thread-entry p { margin: 0; font-family: var(--serif); font-size: 14px; line-height: 1.65; white-space: pre-wrap; }
.reply-box { margin-top: 12px; }
.reply-identity {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 7px;
  color: var(--muted);
  font-size: 11px;
}
.identity-options.compact { width: 132px; }
.identity-options.compact button { min-height: 30px; padding: 0 8px; font-size: 11px; }
.reply-row { display: flex; gap: 7px; }
.reply-row input { min-width: 0; flex: 1; padding: 8px 10px; border: 1px solid var(--line); border-radius: 9px; background: white; }
.reply-row button { border: 0; border-radius: 9px; padding: 0 10px; color: white; background: var(--ink); }

.selection-menu {
  position: fixed;
  z-index: 70;
  width: 320px;
  padding: 13px;
  border: 1px solid var(--line);
  border-radius: 15px;
  color: var(--ink);
  background: color-mix(in srgb, var(--paper) 94%, white);
  box-shadow: 0 8px 24px rgba(0,0,0,.2);
}
.selection-menu blockquote {
  max-height: 72px;
  margin: 0 0 10px;
  overflow: hidden;
  color: var(--muted);
  font-family: var(--serif);
  font-size: 12px;
  line-height: 1.55;
}
.selection-menu > span {
  display: block;
  margin: 0 3px 7px;
  color: var(--muted);
  font-size: 11px;
}
.selection-menu .identity-options button { min-height: 36px; }
.selection-menu textarea {
  width: 100%;
  margin-top: 10px;
  padding: 9px 10px;
  resize: vertical;
  border: 1px solid var(--line);
  border-radius: 10px;
  color: var(--ink);
  background: rgba(255,255,255,.76);
  font-family: var(--serif);
  line-height: 1.55;
}
.selection-actions {
  margin-top: 9px;
  display: flex;
  justify-content: flex-end;
  gap: 7px;
}

.drawer-backdrop {
  position: fixed;
  z-index: 54;
  inset: 0;
  background: rgba(38,34,30,.32);
  backdrop-filter: blur(2px);
}
.mobile-toc {
  position: fixed;
  z-index: 55;
  top: 0;
  bottom: 0;
  left: 0;
  width: min(360px, 88vw);
  padding: 18px 16px 28px;
  overflow-y: auto;
  border-right: 1px solid var(--line);
  color: var(--ink);
  background: var(--paper);
  box-shadow: 18px 0 50px rgba(40,32,24,.18);
}
.mobile-toc > header {
  position: sticky;
  top: -18px;
  z-index: 1;
  margin: -18px -16px 12px;
  padding: 18px 16px 12px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, var(--paper) 94%, transparent);
  backdrop-filter: blur(10px);
}
.mobile-toc > header div { display: grid; gap: 3px; }
.mobile-toc > header span { font-family: var(--serif); font-weight: 700; }
.mobile-toc > header small { color: var(--muted); }
.drawer-open { overflow: hidden; }

.reader.immersive .toc-panel,
.reader.immersive .annotation-panel { display: none; }
.reader.immersive .reader-layout { display: block; }
.reader.immersive .reading-column { max-width: 820px; margin: 0 auto; background: transparent; }
.reader.immersive .reader-bar {
  position: fixed;
  width: 100%;
  opacity: .15;
  border-bottom-color: transparent;
  transition: opacity .2s;
}
.reader.immersive .reader-bar:hover,
.reader.immersive .reader-bar:focus-within { opacity: 1; }
.reader.immersive .reading-column { padding-top: 120px; }

.modal {
  width: min(92vw, 460px);
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: 20px;
  color: var(--ink);
  background: var(--paper);
  box-shadow: var(--shadow);
}
.modal::backdrop { background: rgba(35,30,25,.42); backdrop-filter: blur(4px); }
.modal h2 { margin: 0 0 22px; font-family: var(--serif); font-size: 28px; font-weight: 500; }
.modal label { display: grid; gap: 7px; margin: 14px 0; color: var(--muted); font-size: 13px; }
.modal input { width: 100%; padding: 12px 13px; border: 1px solid var(--line); border-radius: 10px; background: white; }
.file-name { color: var(--muted); font-size: 12px; }
.modal-actions { display: flex; justify-content: flex-end; gap: 8px; margin-top: 24px; }

.timeline-modal {
  width: min(94vw, 720px);
  max-height: 84vh;
  overflow: hidden;
}
.timeline-header { margin-bottom: 18px; }
.timeline-header h2 { margin-bottom: 0; }
.timeline-list {
  max-height: calc(84vh - 120px);
  overflow-y: auto;
  padding-right: 5px;
}
.timeline-list h3 {
  position: sticky;
  top: 0;
  z-index: 1;
  margin: 18px 0 9px;
  padding: 7px 0;
  color: var(--accent);
  background: var(--paper);
  font-size: 12px;
}
.timeline-entry {
  margin-bottom: 10px;
  padding: 13px 15px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--human);
  border-radius: 12px;
  background: rgba(255,255,255,.62);
}
.timeline-entry.ai { border-left-color: var(--ai); }
.timeline-entry header { display: flex; flex-wrap: wrap; gap: 6px 10px; color: var(--muted); font-size: 11px; }
.timeline-entry header strong { color: var(--human); }
.timeline-entry.ai header strong { color: var(--ai); }
.timeline-entry header time { margin-left: auto; }
.timeline-entry blockquote { margin: 9px 0 5px; color: var(--muted); font-family: var(--serif); font-size: 12px; }
.timeline-entry p { margin: 0; font-family: var(--serif); line-height: 1.65; white-space: pre-wrap; }
.timeline-empty { padding: 48px 0; color: var(--muted); text-align: center; font-family: var(--serif); }

.toast {
  position: fixed;
  z-index: 100;
  left: 50%;
  bottom: 28px;
  transform: translate(-50%, 20px);
  padding: 11px 17px;
  border-radius: 999px;
  color: white;
  background: rgba(47,44,40,.92);
  opacity: 0;
  pointer-events: none;
  transition: .2s;
}
.toast.show { opacity: 1; transform: translate(-50%, 0); }

@media (max-width: 980px) {
  .reader-layout { grid-template-columns: minmax(0, 1fr) 310px; }
  .toc-panel { display: none; }
  .reading-column { padding-left: clamp(22px, 5vw, 52px); padding-right: clamp(22px, 5vw, 52px); }
}

@media (max-width: 720px) {
  .desk { padding: 0 0 48px; }
  .desk-header {
    min-height: 58px;
    padding: 9px 14px;
    align-items: center;
    flex-wrap: wrap;
  }
  .desk-brand { flex: 1; }
  .desk-brand .connection { display: none; }
  .header-actions { gap: 7px; }
  .theme-control > span { display: none; }
  .theme-control select { min-height: 34px; max-width: 80px; }
  #authorSettingsButton { display: none; }
  #importButton { min-height: 34px; padding: 0 11px; font-size: 11px; }
  .desk-summary { padding: 12px 16px; gap: 24px; }
  .reading-reminder { padding: 8px 16px; align-items: flex-start; }
  .book-grid { padding: 18px 16px; grid-template-columns: 1fr; }
  .book-card { min-height: 222px; }
  .reader-bar { height: 62px; padding: 0 8px; grid-template-columns: auto 1fr; }
  .reader-bar .ghost { min-height: 36px; padding: 0 10px; font-size: 12px; }
  .reader-title { display: none; }
  .reader-actions { gap: 5px; }
  .reader-actions { justify-self: end; }
  .reader-actions .square { min-width: 38px; padding: 0 8px; }
  .reading-settings {
    top: auto;
    right: 10px;
    bottom: calc(10px + env(safe-area-inset-bottom));
    left: 10px;
    width: auto;
    padding: 18px;
    border-radius: 20px;
  }
  .reader-layout { display: block; }
  .toc-panel { display: none; }
  .annotation-panel {
    position: fixed;
    z-index: 30;
    inset: 62px 0 0;
    height: auto;
    padding: 22px 18px 80px;
    border: 0;
    background: var(--paper);
  }
  .reader:not(.immersive) .reading-column { display: none; }
  .reader.immersive .reading-column { display: block; padding: 105px 22px 80px; }
  .reader.immersive .reader-bar { opacity: .65; }
  .chapter-heading { margin-bottom: 34px; }
  .chapter-heading h2 { font-size: 25px; }
  .chapter-nav { margin-top: 48px; }
  .chapter-nav button { padding: 0 12px; font-size: 13px; }
  .selection-menu {
    top: auto !important;
    right: 10px;
    bottom: calc(10px + env(safe-area-inset-bottom));
    left: 10px !important;
    width: auto;
    max-height: calc(100vh - 80px);
    overflow-y: auto;
    padding: 14px;
    border-radius: 18px;
  }
  .selection-menu blockquote { max-height: 62px; margin-bottom: 9px; }
  .selection-menu > span { margin-bottom: 9px; font-size: 12px; }
  .selection-menu .identity-options button { min-height: 46px; font-size: 14px; }
  .selection-menu textarea { min-height: 82px; resize: none; font-size: 16px; }
  .selection-actions button { min-height: 42px; flex: 1; }
  .identity-options button { min-height: 44px; }
  .annotation-panel { padding-bottom: calc(80px + env(safe-area-inset-bottom)); }
  .timeline-modal {
    width: calc(100vw - 20px);
    max-height: 88vh;
    padding: 20px 16px;
    border-radius: 18px;
  }
  .timeline-list { max-height: calc(88vh - 110px); }
  .timeline-entry header time { width: 100%; margin-left: 0; }
}

/* FLOAT v3：清透主题、沉浸阅读与“我的” */
[hidden] { display: none !important; }

body {
  background:
    radial-gradient(circle at 12% 4%, color-mix(in srgb, var(--glow-a) 74%, transparent), transparent 34%),
    radial-gradient(circle at 88% 24%, color-mix(in srgb, var(--glow-b) 64%, transparent), transparent 32%),
    var(--paper);
  background-attachment: fixed;
}

.desk {
  padding-bottom: 110px;
  background:
    radial-gradient(circle at 9% 0%, color-mix(in srgb, var(--glow-a) 72%, transparent), transparent 32%),
    radial-gradient(circle at 92% 18%, color-mix(in srgb, var(--glow-b) 58%, transparent), transparent 30%);
}

.glass-card,
.glass-button {
  border: 1px solid rgba(255,255,255,.72);
  background: color-mix(in srgb, var(--paper) 54%, rgba(255,255,255,.72));
  box-shadow:
    0 12px 34px color-mix(in srgb, var(--ink) 11%, transparent),
    inset 0 1px 0 rgba(255,255,255,.88);
  backdrop-filter: blur(18px) saturate(118%);
  -webkit-backdrop-filter: blur(18px) saturate(118%);
}

.glass-button {
  min-height: 40px;
  padding: 0 15px;
  border-radius: 999px;
  color: var(--ink);
  transition: transform .18s ease, background .18s ease;
}
.glass-button:hover { transform: translateY(-1px); background: rgba(255,255,255,.84); }
.glass-button:active { transform: translateY(1px); }
.glass-button.small { min-height: 34px; padding: 0 12px; font-size: 12px; }
.icon-button { width: 42px; padding: 0; font-size: 17px; }

.desk-header {
  background: color-mix(in srgb, var(--paper) 66%, transparent);
  border-color: rgba(255,255,255,.65);
}
.desk-brand h1 { letter-spacing: .16em; }

.welcome-panel {
  max-width: 1264px;
  margin: 0 auto;
  padding: 54px 28px 20px;
}
.welcome-panel h2 {
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(27px, 4vw, 42px);
  font-weight: 500;
}
.welcome-panel > p:last-child {
  margin: 10px 0 0;
  color: var(--muted);
  font-family: var(--serif);
}

.desk-summary {
  max-width: 1264px;
  margin: 0 auto 4px;
  border: 0;
}
.book-card { border-color: rgba(255,255,255,.36); }
.book-card:nth-child(4n+1) { --cover: color-mix(in srgb, var(--accent-dark) 78%, #4b6669); }
.book-card:nth-child(4n+2) { --cover: color-mix(in srgb, var(--accent) 72%, #496a65); }
.book-card:nth-child(4n+3) { --cover: color-mix(in srgb, var(--glow-b) 46%, #5a5869); }
.book-card:nth-child(4n+4) { --cover: color-mix(in srgb, var(--glow-a) 44%, #56645c); }

.bottom-nav {
  position: fixed;
  z-index: 35;
  left: 50%;
  bottom: calc(18px + env(safe-area-inset-bottom));
  transform: translateX(-50%);
  width: min(420px, calc(100vw - 32px));
  height: 62px;
  padding: 7px;
  border-radius: 24px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 7px;
}
.bottom-nav button {
  border: 0;
  border-radius: 18px;
  color: var(--muted);
  background: transparent;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  font-size: 13px;
}
.bottom-nav button span { font-size: 16px; }
.bottom-nav button.active {
  color: var(--ink);
  background: color-mix(in srgb, var(--accent) 18%, rgba(255,255,255,.68));
  box-shadow: inset 0 1px 0 rgba(255,255,255,.8);
}

.profile-page {
  width: min(760px, calc(100% - 32px));
  margin: 0 auto;
  padding: 48px 0 24px;
}
.profile-card,
.settings-card {
  border-radius: 28px;
}
.profile-card {
  padding: clamp(22px, 5vw, 40px);
  display: grid;
  grid-template-columns: 150px 1fr;
  gap: 34px;
  align-items: start;
}
.avatar-upload {
  position: relative;
  width: 132px;
  height: 132px;
  border: 5px solid rgba(255,255,255,.75);
  border-radius: 50%;
  overflow: hidden;
  display: grid;
  place-items: center;
  color: var(--ink);
  background:
    radial-gradient(circle at 36% 28%, white, color-mix(in srgb, var(--accent) 42%, white) 56%, var(--accent));
  box-shadow: 0 12px 30px color-mix(in srgb, var(--accent-dark) 22%, transparent);
  cursor: pointer;
}
.avatar-upload img { width: 100%; height: 100%; object-fit: cover; }
.avatar-upload > span { font-family: var(--serif); font-size: 30px; }
.avatar-upload i {
  position: absolute;
  inset: auto 0 0;
  padding: 7px;
  color: white;
  background: rgba(25,35,37,.55);
  text-align: center;
  font-size: 10px;
  font-style: normal;
  opacity: 0;
  transition: opacity .2s;
}
.avatar-upload:hover i { opacity: 1; }
.profile-fields { display: grid; gap: 14px; }
.profile-fields label { display: grid; gap: 7px; color: var(--muted); font-size: 12px; }
.profile-fields input,
.profile-fields textarea {
  width: 100%;
  padding: 11px 13px;
  border: 1px solid color-mix(in srgb, var(--ink) 14%, transparent);
  border-radius: 13px;
  color: var(--ink);
  background: rgba(255,255,255,.62);
  resize: none;
}
.profile-fields button { justify-self: end; }

.settings-card {
  margin-top: 18px;
  overflow: hidden;
}
.settings-card > summary {
  min-height: 86px;
  padding: 20px 24px;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
}
.settings-card > summary::-webkit-details-marker { display: none; }
.settings-card > summary span { display: grid; gap: 5px; }
.settings-card > summary strong { font-family: var(--serif); font-size: 19px; }
.settings-card > summary small { color: var(--muted); }
.settings-card > summary i { font-style: normal; transition: transform .2s; }
.settings-card[open] > summary i { transform: rotate(180deg); }
.settings-content {
  padding: 2px 24px 28px;
  border-top: 1px solid rgba(255,255,255,.7);
}
.settings-content fieldset { margin: 22px 0 0; padding: 0; border: 0; }
.settings-content legend,
.settings-content .range-setting > span {
  margin-bottom: 10px;
  color: var(--muted);
  font-size: 12px;
}
.theme-options {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 9px;
}
.theme-options button,
.background-options button,
.line-height-options button {
  min-height: 46px;
  border: 1px solid color-mix(in srgb, var(--ink) 12%, transparent);
  border-radius: 14px;
  color: var(--ink);
  background: rgba(255,255,255,.55);
}
.theme-options button {
  padding: 7px 10px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.theme-options i {
  width: 30px;
  height: 30px;
  border-radius: 10px;
  background: var(--swatch);
  box-shadow: inset 0 0 0 1px rgba(0,0,0,.04);
}
.theme-options [data-theme="water"] { --swatch: linear-gradient(135deg,#c7edf2 52%,#a7bed8 52%); }
.theme-options [data-theme="calico"] { --swatch: conic-gradient(#e49950 0 34%,#fff0da 0 69%,#4e4843 0); }
.theme-options [data-theme="fog"] { --swatch: linear-gradient(135deg,#f7f6f3 50%,#5e5b58 50%); }
.theme-options [data-theme="peach"] { --swatch: linear-gradient(135deg,#efcbd6 52%,#d7d5e8 52%); }
.theme-options [data-theme="laurel"] { --swatch: linear-gradient(135deg,#b8d4bc 52%,#e7dcc5 52%); }
.theme-options [data-theme="fir"] { --swatch: linear-gradient(135deg,#e5e4e1 52%,#20201e 52%); }
.theme-options button.active,
.background-options button.active,
.line-height-options button.active {
  border-color: var(--accent);
  box-shadow: 0 0 0 2px color-mix(in srgb, var(--accent) 18%, transparent);
  background: rgba(255,255,255,.86);
}
.background-options,
.line-height-options {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 7px;
}
.background-options [data-reading-bg="white"] { background: #fffefa; }
.background-options [data-reading-bg="cream"] { background: #f7efdc; }
.background-options [data-reading-bg="green"] { background: #eaf4ec; }
.background-options [data-reading-bg="gray"] { background: #eef0f1; }
.background-options [data-reading-bg="night"] { color: #e8eeec; background: #20282b; }

.reader {
  min-height: 100vh;
  color: var(--reading-ink);
  background: var(--reading-paper);
}
.reader-bar {
  position: fixed;
  width: 100%;
  height: 68px;
  border-color: transparent;
  color: var(--ink);
  background: linear-gradient(180deg, color-mix(in srgb, var(--reading-paper) 88%, transparent), transparent);
  opacity: .72;
  transition: opacity .2s;
}
.reader-bar:hover,
.reader-bar:focus-within { opacity: 1; }
.reader.immersive .reader-bar { opacity: .72; }
.reader.immersive .reader-bar:hover,
.reader.immersive .reader-bar:focus-within { opacity: 1; }
.reader-layout { display: block; min-height: 100vh; }
.reading-column {
  width: min(820px, 100%);
  min-height: 100vh;
  margin: 0 auto;
  padding: 118px clamp(30px, 7vw, 82px) 110px;
  color: var(--reading-ink);
  background: transparent;
}
.chapter-text mark,
.chapter-text mark.ai,
.chapter-text mark.multi {
  color: inherit;
  background: transparent;
  text-decoration-line: underline;
  text-decoration-thickness: 2px;
  text-underline-offset: 5px;
  text-decoration-color: var(--human);
  cursor: pointer;
}
.chapter-text mark.ai { text-decoration-color: var(--ai); }
.chapter-text mark.multi {
  text-decoration-style: double;
  text-decoration-color: color-mix(in srgb, var(--human) 50%, var(--ai));
}
.chapter-text mark.active {
  outline: 0;
  border-radius: 0;
  text-decoration-thickness: 3px;
}

.chapter-scrubber {
  position: fixed;
  z-index: 28;
  top: 26vh;
  right: 7px;
  height: 48vh;
  width: 34px;
  display: flex;
  flex-direction: column;
  align-items: center;
  color: var(--muted);
  opacity: .38;
  transition: opacity .2s;
}
.chapter-scrubber:hover,
.chapter-scrubber:focus-within,
.chapter-scrubber.dragging { opacity: 1; }
.chapter-scrubber output {
  position: absolute;
  top: 50%;
  right: 30px;
  transform: translateY(-50%);
  min-width: 48px;
  padding: 6px 8px;
  border-radius: 999px;
  color: var(--ink);
  background: color-mix(in srgb, var(--reading-paper) 88%, transparent);
  box-shadow: 0 6px 20px rgba(0,0,0,.12);
  text-align: center;
  font-size: 11px;
  opacity: 0;
}
.chapter-scrubber:hover output,
.chapter-scrubber:focus-within output,
.chapter-scrubber.dragging output { opacity: 1; }
.chapter-scrubber input {
  width: 8px;
  height: 100%;
  margin: 0;
  writing-mode: vertical-lr;
  direction: rtl;
  accent-color: var(--accent);
  cursor: ns-resize;
}

.annotation-drawer {
  position: fixed;
  z-index: 56;
  top: 0;
  right: 0;
  bottom: 0;
  width: min(430px, 92vw);
  padding: 18px 17px 40px;
  overflow-y: auto;
  color: var(--ink);
  background: color-mix(in srgb, var(--paper) 88%, white);
  box-shadow: -18px 0 50px rgba(30,39,41,.18);
}
.annotation-drawer > header,
.inline-annotation-panel > header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
}
.annotation-drawer > header {
  position: sticky;
  z-index: 2;
  top: -18px;
  margin: -18px -17px 16px;
  padding: 18px 17px 14px;
  border-bottom: 1px solid rgba(255,255,255,.72);
  background: color-mix(in srgb, var(--paper) 82%, transparent);
  backdrop-filter: blur(16px);
}
.annotation-drawer > header div { display: grid; gap: 3px; }
.annotation-drawer > header span { font-family: var(--serif); font-weight: 700; }
.annotation-drawer > header small { color: var(--muted); }
.annotation-card {
  border-color: rgba(255,255,255,.75);
  background: rgba(255,255,255,.62);
  box-shadow: 0 8px 24px color-mix(in srgb, var(--ink) 7%, transparent);
}
.annotation-card.selected { border-color: color-mix(in srgb, var(--accent) 70%, white); }
.thread-entry.reply {
  margin-left: 22px;
  padding: 8px 0 8px 13px;
  border-left-width: 2px;
  background: linear-gradient(90deg, color-mix(in srgb, var(--human) 7%, transparent), transparent);
}
.thread-entry.reply.ai {
  background: linear-gradient(90deg, color-mix(in srgb, var(--ai) 8%, transparent), transparent);
}

.inline-annotation-panel {
  position: fixed;
  z-index: 72;
  width: min(390px, calc(100vw - 24px));
  max-height: min(58vh, 520px);
  padding: 14px;
  overflow-y: auto;
  border: 1px solid rgba(255,255,255,.82);
  border-radius: 20px;
  color: var(--ink);
  background: color-mix(in srgb, var(--paper) 84%, white);
  box-shadow: 0 18px 50px rgba(31,39,40,.22);
  backdrop-filter: blur(20px);
}
.inline-annotation-panel > header {
  position: sticky;
  z-index: 3;
  top: -14px;
  margin: -14px -14px 12px;
  padding: 13px 14px 10px;
  background: color-mix(in srgb, var(--paper) 82%, transparent);
  backdrop-filter: blur(18px);
}
.inline-annotation-panel > header strong { font-family: var(--serif); }
.inline-annotation-panel .annotation-list { gap: 10px; }

.mobile-toc {
  background: color-mix(in srgb, var(--paper) 90%, white);
}
.drawer-home {
  width: 100%;
  margin-top: 22px;
}

.timeline-modal {
  width: min(94vw, 760px);
  color: var(--ink);
  background: var(--paper);
}
.timeline-book-card {
  margin-bottom: 14px;
  padding: 14px 15px;
  border: 1px solid rgba(255,255,255,.75);
  border-radius: 16px;
  background: rgba(255,255,255,.55);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.timeline-book-card > div { display: grid; gap: 4px; }
.timeline-book-card strong { font-family: var(--serif); }
.timeline-book-card span { color: var(--muted); font-size: 11px; }
.timeline-day {
  border-top: 1px solid var(--line);
}
.timeline-day > summary {
  position: sticky;
  z-index: 2;
  top: 0;
  padding: 13px 3px;
  list-style: none;
  color: var(--accent-dark);
  background: color-mix(in srgb, var(--paper) 92%, transparent);
  backdrop-filter: blur(10px);
  display: flex;
  justify-content: space-between;
  cursor: pointer;
  font-size: 13px;
  font-weight: 700;
}
.timeline-day > summary::-webkit-details-marker { display: none; }
.timeline-day > summary small { color: var(--muted); font-weight: 400; }
.timeline-thread {
  margin-bottom: 14px;
  display: flex;
  flex-direction: column;
  gap: 9px;
}
.timeline-thread .timeline-entry { margin-bottom: 0; }
.timeline-thread .timeline-entry.reply { margin-left: 28px; }

body[data-theme="fir"] .primary,
body[data-theme="fir"] .bottom-nav button.active {
  color: white;
  background: var(--ink);
}
body[data-theme="fir"] .glass-card,
body[data-theme="fir"] .glass-button {
  border-color: rgba(31,31,29,.26);
  border-radius: 12px;
  box-shadow: 0 8px 24px rgba(18,34,29,.09);
}
body[data-theme="fog"] .glass-card,
body[data-theme="fog"] .glass-button {
  box-shadow: 0 7px 22px rgba(40,38,35,.07);
}

@media (max-width: 720px) {
  .desk { padding-bottom: 104px; }
  .desk-header { flex-wrap: nowrap; }
  .welcome-panel { padding: 40px 18px 14px; }
  .welcome-panel h2 { font-size: 29px; }
  .profile-page { width: calc(100% - 28px); padding-top: 24px; }
  .profile-card { grid-template-columns: 92px 1fr; gap: 16px; padding: 20px 16px; }
  .avatar-upload { width: 88px; height: 88px; border-width: 4px; }
  .avatar-upload i { opacity: 1; }
  .theme-options { grid-template-columns: repeat(2, 1fr); }
  .background-options,
  .line-height-options { grid-template-columns: repeat(5, minmax(0, 1fr)); }
  .background-options button,
  .line-height-options button { min-height: 42px; padding: 0 3px; font-size: 11px; }
  .settings-content { padding: 2px 16px 24px; }
  .bottom-nav { bottom: calc(10px + env(safe-area-inset-bottom)); }

  .reader-bar {
    height: 60px;
    padding: 0 10px;
    grid-template-columns: auto 1fr auto;
    opacity: .78;
  }
  .reader-title { display: none; }
  .reader-actions .glass-button { min-height: 38px; padding: 0 11px; font-size: 11px; }
  .reading-column { padding: 92px 24px 86px; }
  .chapter-text { letter-spacing: .02em; }
  .chapter-scrubber { top: 24vh; right: 2px; height: 52vh; width: 27px; }
  .chapter-scrubber output { right: 24px; }
  .inline-annotation-panel {
    top: auto !important;
    right: 9px;
    bottom: calc(9px + env(safe-area-inset-bottom));
    left: 9px !important;
    width: auto;
    max-height: min(62vh, 560px);
    border-radius: 22px;
  }
  .annotation-drawer {
    top: 19vh;
    width: 100%;
    border-radius: 24px 24px 0 0;
    box-shadow: 0 -18px 50px rgba(30,39,41,.18);
  }
  .timeline-book-card { align-items: flex-start; }
  .timeline-book-card .glass-button { padding: 0 10px; font-size: 11px; }
}

/* FLOAT v4：按移动端设计稿拆分书桌、书架与全页阅读辅助界面 */
.desk-page,
.shelf-page {
  width: min(760px, calc(100% - 32px));
  margin: 0 auto;
}

.welcome-panel {
  max-width: none;
  padding: 48px 4px 24px;
}

.quick-entry,
.desk-section,
.desk-summary {
  width: 100%;
  margin: 0 0 16px;
  padding: 18px;
  border: 0;
  border-radius: 24px;
}

.quick-entry > p,
.desk-section > p,
.desk-summary > p {
  margin: 0 0 16px;
  color: var(--muted);
  font-size: 12px;
}

.quick-entry > div {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}

.quick-entry button {
  min-height: 88px;
  padding: 8px;
  border: 0;
  border-radius: 18px;
  color: var(--ink);
  background: rgba(255,255,255,.35);
  display: grid;
  place-items: center;
  gap: 7px;
}

.quick-entry button i {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: color-mix(in srgb, var(--accent) 48%, white);
  display: grid;
  place-items: center;
  font-family: var(--serif);
  font-style: normal;
  font-size: 16px;
}

.quick-entry button:last-child i {
  background: color-mix(in srgb, var(--human) 46%, white);
}

.quick-entry button span { font-size: 12px; }

.current-book {
  display: grid;
  grid-template-columns: 100px minmax(0, 1fr);
  gap: 20px;
  align-items: stretch;
}

.current-book-cover,
.book-cover {
  position: relative;
  overflow: hidden;
  border-radius: 12px;
  background:
    linear-gradient(180deg, color-mix(in srgb, var(--accent) 34%, #cab15e), #435e55);
  box-shadow: 0 10px 24px color-mix(in srgb, var(--ink) 15%, transparent);
}

.current-book-cover::after,
.book-cover::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 78% 18%, rgba(255,255,255,.28), transparent 28%),
    linear-gradient(135deg, transparent 54%, rgba(0,0,0,.12));
}

.current-book-copy { min-width: 0; }
.current-book-title {
  display: flex;
  justify-content: space-between;
  gap: 12px;
}
.current-book-title h3 {
  margin: 3px 0 5px;
  overflow: hidden;
  text-overflow: ellipsis;
  font-family: var(--serif);
  font-size: 20px;
  white-space: nowrap;
}
.current-book-title p,
.current-chapter {
  margin: 0;
  color: var(--muted);
  font-size: 11px;
}
.current-book-title > strong {
  color: var(--muted);
  font-size: 12px;
  font-weight: 500;
}
.current-chapter { margin-top: 15px; }
.current-book .progress-track,
.book-card .progress-track {
  height: 4px;
  margin: 13px 0;
  border-radius: 99px;
  background: color-mix(in srgb, var(--ink) 10%, transparent);
  overflow: hidden;
}
.current-book .progress-track i,
.book-card .progress-track i {
  border-radius: inherit;
  background: var(--human);
}
.current-book-actions {
  display: flex;
  gap: 8px;
}
.current-book-actions button {
  min-height: 36px;
  flex: 1;
  padding: 0 10px;
  border-radius: 12px;
  font-size: 11px;
}

.desk-summary { display: block; }
.co-reading-status {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 22px;
}
.co-reading-status > div {
  min-width: 0;
  display: flex;
  align-items: center;
  gap: 11px;
}
.co-reading-status i {
  width: 42px;
  height: 42px;
  flex: 0 0 42px;
  border-radius: 50%;
  color: white;
  background: var(--human);
  display: grid;
  place-items: center;
  font-style: normal;
  font-size: 11px;
}
.co-reading-status i.ai-avatar { background: var(--ai); }
.co-reading-status span { min-width: 0; display: grid; gap: 4px; }
.co-reading-status strong {
  overflow: hidden;
  text-overflow: ellipsis;
  font-size: 12px;
  white-space: nowrap;
}
.co-reading-status small { color: var(--muted); font-size: 9px; }

.shelf-page { padding: 42px 0 20px; }
.shelf-heading {
  padding: 0 4px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
}
.shelf-heading h2 {
  margin: 4px 0 7px;
  font-family: var(--serif);
  font-size: 30px;
  font-weight: 600;
}
.shelf-heading > div > p:last-child {
  margin: 0;
  color: var(--muted);
  font-size: 12px;
}
.shelf-heading > div > p:last-child strong { color: var(--ink); }

.book-grid {
  max-width: none;
  padding: 0;
  grid-template-columns: 1fr;
  gap: 12px;
}

.book-card {
  min-height: 142px;
  padding: 14px;
  border: 1px solid rgba(255,255,255,.72);
  border-radius: 22px;
  color: var(--ink);
  background: color-mix(in srgb, var(--paper) 54%, rgba(255,255,255,.72));
  box-shadow:
    0 10px 28px color-mix(in srgb, var(--ink) 9%, transparent),
    inset 0 1px 0 rgba(255,255,255,.88);
  display: grid;
  grid-template-columns: 84px minmax(0, 1fr);
  gap: 16px;
  overflow: visible;
  transform: none;
  backdrop-filter: blur(18px) saturate(118%);
  -webkit-backdrop-filter: blur(18px) saturate(118%);
}
.book-card:hover { transform: translateY(-2px); }
.book-card::after { display: none; }
.book-card:nth-child(4n+2) .book-cover {
  background: linear-gradient(180deg, #f1bd91, #d77f74 52%, #66788a);
}
.book-card:nth-child(4n+3) .book-cover {
  background: linear-gradient(180deg, #dac690, #8196a7);
}
.book-card:nth-child(4n+4) .book-cover {
  background: linear-gradient(180deg, #d4b7c2, #9ca9bd);
}
.book-cover { min-height: 114px; }
.book-cover span {
  position: absolute;
  z-index: 2;
  right: 7px;
  bottom: 7px;
  color: rgba(255,255,255,.86);
  font-size: 9px;
}
.book-card-body { min-width: 0; }
.book-card-body > header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
}
.book-card-body > header > div { min-width: 0; }
.book-card-body > header > strong {
  color: var(--muted);
  font-size: 11px;
  font-weight: 500;
}
.book-status {
  padding: 2px 7px;
  color: var(--accent-dark);
  background: color-mix(in srgb, var(--accent) 16%, white);
}
.book-status.done {
  color: var(--human);
  background: color-mix(in srgb, var(--human) 14%, white);
}
.book-card h2 {
  margin: 6px 0 2px;
  overflow: hidden;
  text-overflow: ellipsis;
  color: var(--ink);
  font-size: 17px;
  white-space: nowrap;
}
.book-author {
  margin: 3px 0 0;
  overflow: hidden;
  color: var(--muted);
  text-overflow: ellipsis;
  white-space: nowrap;
}
.book-chapter {
  margin: 8px 0 0;
  color: var(--muted);
  font-size: 10px;
}
.book-chapter small { margin-left: 5px; }
.book-card .progress-track { margin: 9px 0; }
.book-actions { gap: 7px; }
.book-actions button {
  min-height: 30px;
  border-color: color-mix(in srgb, var(--ink) 12%, transparent);
  border-radius: 10px;
  color: var(--ink);
  background: rgba(255,255,255,.46);
}
.book-actions button:hover { background: rgba(255,255,255,.82); }
.book-actions .delete { flex-basis: 32px; color: var(--muted); }

.bottom-nav { grid-template-columns: repeat(3, 1fr); }

.backup-card {
  margin-top: 18px;
  padding: 22px 24px;
  border-radius: 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
}
.backup-card > div:first-child { min-width: 0; display: grid; gap: 5px; }
.backup-card strong { font-family: var(--serif); font-size: 19px; }
.backup-card small { color: var(--muted); line-height: 1.5; }
.backup-actions { display: flex; gap: 8px; }
.backup-actions button { white-space: nowrap; }
.cloud-sync-box {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: minmax(150px, .8fr) minmax(280px, 1.7fr) auto;
  align-items: center;
  gap: 10px;
  width: 100%;
  padding-top: 13px;
  border-top: 1px solid var(--line);
}
.cloud-sync-heading { display: grid; gap: 3px; }
.cloud-sync-heading span { display: flex; align-items: center; gap: 7px; font-weight: 700; }
.cloud-sync-heading i { width: 8px; height: 8px; border-radius: 50%; background: var(--muted); }
.cloud-sync-heading i.online { background: #69ad8b; box-shadow: 0 0 0 4px rgba(105,173,139,.12); }
.cloud-sync-heading i.syncing,
.cloud-sync-heading i.pending { background: var(--accent); }
.cloud-sync-heading i.offline { background: #cf765f; }
.cloud-sync-fields { display: grid; grid-template-columns: 1.35fr 1fr; gap: 8px; }
.cloud-sync-fields input {
  min-width: 0;
  height: 38px;
  padding: 0 11px;
  border: 1px solid var(--line);
  border-radius: 12px;
  color: var(--ink);
  background: rgba(255,255,255,.68);
}
.cloud-sync-actions { display: flex; gap: 7px; }

.toc-title-row {
  display: flex !important;
  align-items: center;
  gap: 10px !important;
}
.toc-title-row > div { display: grid; gap: 3px; }
.toc-title-row .icon-button { width: 36px; min-height: 36px; }

.chapter-scrubber {
  --scrubber-length: 48vh;
  height: var(--scrubber-length);
  opacity: .68;
}
.chapter-scrubber output {
  top: var(--scroll-percent, 0%);
  transition: top .08s linear;
}
.chapter-scrubber input {
  position: absolute;
  top: 50%;
  left: 50%;
  width: var(--scrubber-length);
  height: 24px;
  margin: 0;
  appearance: auto;
  -webkit-appearance: auto;
  writing-mode: horizontal-tb;
  direction: ltr;
  transform: translate(-50%, -50%) rotate(90deg);
  transform-origin: center;
}

dialog.timeline-modal[open] {
  display: flex;
  flex-direction: column;
}
.timeline-list { min-height: 0; }

@media (max-width: 720px) {
  .desk {
    padding-bottom: 104px;
    overflow-x: hidden;
  }
  .desk-page,
  .shelf-page { width: calc(100% - 28px); }
  .desk-header {
    min-height: 60px;
    padding: 10px 14px;
  }
  .desk-brand h1 { font-size: 16px; }
  .book-count { display: none; }
  .welcome-panel { padding: 38px 4px 22px; }
  .welcome-panel h2 { font-size: 31px; }
  .quick-entry,
  .desk-section,
  .desk-summary {
    margin-bottom: 12px;
    padding: 15px;
    border-radius: 20px;
  }
  .quick-entry button { min-height: 76px; }
  .current-book {
    grid-template-columns: 76px minmax(0, 1fr);
    gap: 13px;
  }
  .current-book-cover { min-height: 112px; }
  .current-book-title h3 { font-size: 18px; }
  .current-chapter { margin-top: 12px; }
  .co-reading-status { gap: 12px; }
  .co-reading-status i {
    width: 38px;
    height: 38px;
    flex-basis: 38px;
  }
  .shelf-page { padding-top: 28px; }
  .shelf-heading h2 { font-size: 27px; }
  .book-grid { padding: 0; }
  .book-card {
    min-height: 130px;
    padding: 12px;
    grid-template-columns: 72px minmax(0, 1fr);
    gap: 12px;
    border-radius: 18px;
  }
  .book-cover { min-height: 106px; }
  .book-card h2 { font-size: 16px; }
  .bottom-nav {
    width: calc(100vw - 28px);
    height: 60px;
    padding: 6px;
    border-radius: 22px;
  }
  .bottom-nav button {
    border-radius: 17px;
    gap: 5px;
    font-size: 12px;
  }
  .bottom-nav button span { font-size: 14px; }

  .theme-options { grid-template-columns: 1fr; }
  .theme-options button {
    min-height: 58px;
    padding: 8px 12px;
    justify-content: flex-start;
  }
  .theme-options i {
    width: 72px;
    height: 40px;
    border-radius: 12px;
  }
  .backup-card {
    padding: 19px 16px;
    border-radius: 20px;
    align-items: stretch;
    flex-direction: column;
  }
  .backup-actions { display: grid; grid-template-columns: 1fr 1fr; }
  .backup-actions button { min-height: 44px; padding: 0 10px; }
  .cloud-sync-box { grid-template-columns: 1fr; }
  .cloud-sync-fields { grid-template-columns: 1fr; }
  .cloud-sync-actions { display: grid; grid-template-columns: 1fr 1fr; }

  .reader-bar,
  .reader.immersive .reader-bar {
    height: 62px;
    opacity: 1;
    background: color-mix(in srgb, var(--reading-paper) 92%, transparent);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
  }
  .reader.immersive .reading-column {
    padding: 92px 24px 88px;
  }
  .chapter-scrubber {
    --scrubber-length: 54vh;
    top: 25vh;
    right: 0;
    height: var(--scrubber-length);
    width: 28px;
    opacity: .78;
  }
  .chapter-scrubber output { right: 25px; }

  .mobile-toc {
    width: min(400px, 90vw);
    padding-bottom: calc(24px + env(safe-area-inset-bottom));
  }

  .annotation-drawer {
    inset: 0;
    width: 100%;
    height: 100dvh;
    padding: 18px 16px calc(28px + env(safe-area-inset-bottom));
    border-radius: 0;
    background: var(--paper);
    box-shadow: none;
  }
  .annotation-drawer > header {
    top: -18px;
    margin: -18px -16px 16px;
    padding: calc(18px + env(safe-area-inset-top)) 16px 14px;
    background: color-mix(in srgb, var(--paper) 94%, transparent);
  }
  .annotation-card {
    padding: 15px;
    border-radius: 18px;
  }

  .timeline-modal {
    inset: 0;
    width: 100vw;
    height: 100dvh;
    max-width: none;
    max-height: none;
    margin: 0;
    padding: calc(18px + env(safe-area-inset-top)) 16px calc(18px + env(safe-area-inset-bottom));
    border: 0;
    border-radius: 0;
    background: var(--paper);
  }
  .timeline-header { flex: 0 0 auto; }
  .timeline-header h2 { font-size: 28px; }
  .timeline-book-card {
    flex: 0 0 auto;
    margin-bottom: 8px;
    border-radius: 18px;
  }
  .timeline-list {
    max-height: none;
    flex: 1 1 auto;
    overflow-y: auto;
    padding: 0 1px 28px;
  }
  .timeline-day > summary {
    top: 0;
    padding: 14px 4px;
  }
  .timeline-entry {
    margin-bottom: 10px;
    padding: 14px;
    border-radius: 16px;
  }
  .timeline-entry header time {
    width: auto;
    margin-left: auto;
  }
}

@media (max-width: 390px) {
  .book-card {
    grid-template-columns: 64px minmax(0, 1fr);
    gap: 10px;
  }
  .book-actions .timeline { flex: 1; }
  .book-actions button { padding: 0 7px; font-size: 9px; }
  .co-reading-status strong { font-size: 11px; }
}

/* FLOAT v5：精简主界面、头像资料与阅读页快捷排版 */
.profile-page {
  padding-top: 26px;
}

.profile-card {
  padding: 26px;
  grid-template-columns: 136px minmax(0, 1fr);
  gap: 26px;
  align-items: center;
}

.avatar-upload {
  width: 132px;
  height: 132px;
  border-width: 4px;
}

.avatar-upload img {
  border-radius: 50%;
}

.avatar-upload i {
  inset: auto 7px 7px auto;
  width: 32px;
  height: 32px;
  padding: 0;
  border: 2px solid rgba(255, 255, 255, .88);
  border-radius: 50%;
  display: grid;
  place-items: center;
  color: white;
  background: color-mix(in srgb, var(--accent-dark) 78%, #263234);
  font-family: var(--sans);
  font-size: 15px;
  opacity: 1;
}

.profile-fields {
  width: 100%;
  gap: 11px;
}

.profile-fields label {
  gap: 5px;
}

.profile-fields input {
  min-height: 44px;
}

.profile-fields input[readonly] {
  color: color-mix(in srgb, var(--ink) 82%, var(--muted));
  background: rgba(255, 255, 255, .42);
}

.profile-fields.editing input {
  border-color: color-mix(in srgb, var(--accent) 72%, white);
  background: rgba(255, 255, 255, .78);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 12%, transparent);
}

.profile-actions {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
}

.profile-icon-button {
  width: 42px;
  height: 42px;
  padding: 0;
  border: 1px solid color-mix(in srgb, var(--ink) 14%, transparent);
  border-radius: 50%;
  display: grid;
  place-items: center;
  color: var(--ink);
  background: rgba(255, 255, 255, .68);
  font-family: var(--sans);
  font-size: 17px;
}

.profile-icon-button.primary {
  color: white;
  border-color: transparent;
  background: var(--accent-dark);
}

.profile-icon-button:disabled {
  opacity: .34;
}

.settings-card > summary {
  min-height: 68px;
  padding: 14px 20px;
}

.settings-card > summary strong,
.backup-card strong {
  font-size: 17px;
}

.settings-card > summary small,
.backup-card small {
  font-size: 11px;
}

.backup-card {
  padding: 16px 20px;
  border-radius: 22px;
}

.reader-format-button {
  width: 42px;
  min-width: 42px;
  padding: 0;
  border-radius: 50%;
  font-family: var(--serif);
  font-size: 20px;
}

.reader-format-button[aria-expanded="true"] {
  color: white;
  border-color: var(--accent);
  background: var(--accent);
}

.reader-quick-settings {
  position: fixed;
  z-index: 42;
  top: 72px;
  right: 14px;
  width: min(470px, calc(100vw - 28px));
  padding: 13px;
  border-radius: 18px;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  color: var(--ink);
  background: color-mix(in srgb, var(--reading-paper) 92%, white);
  box-shadow: 0 16px 42px rgba(28, 38, 39, .16);
}

.reader-quick-settings > label,
.quick-stepper {
  min-width: 0;
  display: grid;
  gap: 6px;
}

.reader-quick-settings > label > span,
.quick-stepper > span {
  color: var(--muted);
  font-size: 10px;
  text-align: center;
}

.reader-quick-settings select,
.quick-stepper > div {
  width: 100%;
  min-height: 38px;
  border: 1px solid color-mix(in srgb, var(--ink) 13%, transparent);
  border-radius: 12px;
  color: var(--ink);
  background: rgba(255, 255, 255, .72);
}

.reader-quick-settings select {
  padding: 0 9px;
  text-align: center;
}

.quick-stepper > div {
  display: grid;
  grid-template-columns: 32px 1fr 32px;
  align-items: center;
}

.quick-stepper button {
  height: 100%;
  padding: 0;
  border: 0;
  color: var(--ink);
  background: transparent;
  font-size: 17px;
}

.quick-stepper output {
  text-align: center;
  font-size: 12px;
  font-weight: 700;
}

.timeline-tabs {
  flex: 0 0 auto;
  margin: 0 0 12px;
  padding: 2px 0 5px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: none;
}

.timeline-tabs::-webkit-scrollbar {
  display: none;
}

.timeline-tabs button {
  min-height: 36px;
  padding: 0 15px;
  border: 1px solid color-mix(in srgb, var(--ink) 12%, transparent);
  border-radius: 999px;
  flex: 0 0 auto;
  color: var(--muted);
  background: rgba(255, 255, 255, .48);
  white-space: nowrap;
}

.timeline-tabs button.active {
  color: white;
  border-color: var(--accent);
  background: var(--accent);
}

.timeline-entry .timeline-book-name {
  display: block;
  margin-top: 8px;
  color: var(--accent-dark);
  font-size: 11px;
  font-weight: 700;
}

.profile-page .settings-card > summary strong,
.profile-page .backup-card strong {
  font-family: Inter, "Noto Sans SC", "Noto Sans CJK SC", system-ui, sans-serif;
  font-size: 15px;
  font-weight: 600;
  letter-spacing: -.02em;
}

.profile-page .settings-card > summary small,
.profile-page .backup-card small {
  font-family: Inter, "Noto Sans SC", "Noto Sans CJK SC", system-ui, sans-serif;
  font-size: 11px;
  font-weight: 400;
  line-height: 1.45;
}

.annotation-card,
.timeline-entry {
  position: relative;
}

.annotation-delete {
  position: absolute;
  z-index: 2;
  top: 7px;
  right: 7px;
  display: grid;
  width: 22px;
  min-width: 22px;
  height: 22px;
  min-height: 22px;
  padding: 0;
  place-items: center;
  border: 0;
  border-radius: 50%;
  color: color-mix(in srgb, var(--muted) 72%, transparent);
  background: transparent;
  box-shadow: none;
  font-family: Arial, sans-serif;
  font-size: 15px;
  font-weight: 400;
  line-height: 1;
}

.annotation-delete:hover,
.annotation-delete:focus-visible {
  color: var(--ink);
  background: color-mix(in srgb, var(--ink) 7%, transparent);
  transform: none;
}

.annotation-card > .annotation-quote,
.timeline-entry > header {
  padding-right: 20px;
}

@media (max-width: 720px) {
  .welcome-panel {
    padding-top: 30px;
  }

  .profile-page {
    padding-top: 16px;
  }

  .profile-card {
    padding: 18px 16px;
    display: flex;
    flex-direction: column;
    gap: 15px;
  }

  .avatar-upload {
    width: 112px;
    height: 112px;
  }

  .profile-actions {
    justify-content: center;
  }

  .settings-card,
  .backup-card {
    margin-top: 10px;
  }

  .settings-card > summary {
    min-height: 58px;
    padding: 10px 15px;
  }

  .backup-card {
    padding: 13px 15px;
    gap: 10px;
    border-radius: 20px;
  }

  .backup-actions button {
    min-height: 38px;
    font-size: 13px;
  }

  .reader-actions {
    gap: 7px;
  }

  .reader-format-button {
    width: 40px;
    min-width: 40px;
    min-height: 40px !important;
    padding: 0 !important;
    font-size: 19px !important;
  }

  .reader-quick-settings {
    top: calc(68px + env(safe-area-inset-top));
    right: 10px;
    left: 10px;
    width: auto;
    padding: 11px;
    gap: 7px;
    border-radius: 16px;
  }

  .reader-quick-settings select,
  .quick-stepper > div {
    min-height: 36px;
  }

  .quick-stepper > div {
    grid-template-columns: 27px 1fr 27px;
  }

  .timeline-tabs {
    margin-bottom: 8px;
  }

  .timeline-tabs button {
    min-height: 34px;
    padding: 0 13px;
    font-size: 12px;
  }
}

/* Android edge-to-edge：主题背景延伸到系统状态栏，内容避开状态栏手势区。 */
.desk-page {
  padding-top: env(safe-area-inset-top);
}

.shelf-page {
  padding-top: calc(42px + env(safe-area-inset-top));
}

.profile-page {
  padding-top: calc(26px + env(safe-area-inset-top));
}

.reader-bar,
.reader.immersive .reader-bar {
  height: calc(68px + env(safe-area-inset-top));
  padding-top: env(safe-area-inset-top);
}

.reading-column {
  padding-top: calc(118px + env(safe-area-inset-top));
}

.reader.immersive .reading-column {
  padding-top: calc(120px + env(safe-area-inset-top));
}

@media (max-width: 720px) {
  .mobile-toc {
    padding: 0 16px calc(24px + env(safe-area-inset-bottom));
    overflow: hidden;
    display: flex;
    flex-direction: column;
  }

  .mobile-toc > header {
    position: relative;
    top: auto;
    flex: 0 0 auto;
    margin: 0 -16px;
    padding: calc(12px + env(safe-area-inset-top)) 16px 12px;
  }

  .mobile-toc > .chapter-list {
    min-height: 0;
    padding-top: 12px;
    overflow-y: auto;
    overscroll-behavior: contain;
  }

  .shelf-page {
    padding-top: calc(28px + env(safe-area-inset-top));
  }

  .profile-page {
    padding-top: calc(16px + env(safe-area-inset-top));
  }

  .reader-bar,
  .reader.immersive .reader-bar {
    height: calc(62px + env(safe-area-inset-top));
    padding-top: env(safe-area-inset-top);
  }

  .reading-column,
  .reader.immersive .reading-column {
    padding-top: calc(92px + env(safe-area-inset-top));
  }
}