:root {
  --bg: #f7f5ef;
  --fg: #2c2c2c;
  --muted: #8a8678;
  --card: #ffffff;
  --accent: #3f51b5;
  --border: #e4e0d3;
  --hl-y: rgba(255, 213, 79, .45);
  --hl-g: rgba(129, 199, 132, .45);
  --hl-b: rgba(121, 194, 244, .45);
  --hl-p: rgba(244, 143, 177, .45);
  --sel-bg: rgba(63, 81, 181, .18);
}
body.sepia {
  --bg: #f2e8d5; --fg: #4a3f2f; --muted: #9c8f74;
  --card: #faf3e3; --border: #e0d3ba;
}
body.dark {
  --bg: #121212; --fg: #cfcfcf; --muted: #6d6d6d;
  --card: #1e1e1e; --border: #2e2e2e;
  --sel-bg: rgba(121, 194, 244, .25);
}

* { margin: 0; padding: 0; box-sizing: border-box; -webkit-tap-highlight-color: transparent; }
html, body { height: 100%; }
body {
  font-family: -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg); color: var(--fg);
  transition: background .25s, color .25s;
  overscroll-behavior: none;
}
.hidden { display: none !important; }
.dim { color: var(--muted); }
.ellipsis { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.err { color: #e53935; font-size: 13px; margin-top: 8px; text-align: center; }

.view { min-height: 100vh; display: flex; flex-direction: column; }

/* ---------- 登录 ---------- */
#view-login { align-items: center; justify-content: center; }
.login-box {
  width: min(340px, 88vw); background: var(--card);
  border: 1px solid var(--border); border-radius: 16px;
  padding: 36px 28px; text-align: center;
  box-shadow: 0 8px 30px rgba(0,0,0,.06);
}
.login-logo { font-size: 44px; }
.login-box h1 { font-size: 22px; margin: 12px 0 4px; }
.login-sub { color: var(--muted); font-size: 14px; margin-bottom: 20px; }
.login-box input {
  width: 100%; padding: 12px 14px; font-size: 16px;
  border: 1px solid var(--border); border-radius: 10px;
  background: var(--bg); color: var(--fg); outline: none;
}
.login-box input:focus { border-color: var(--accent); }

/* ---------- 顶栏 ---------- */
.topbar {
  display: flex; align-items: center; gap: 10px;
  padding: calc(env(safe-area-inset-top) + 12px) 16px 10px;
  border-bottom: 1px solid var(--border);
  position: sticky; top: 0; background: var(--bg); z-index: 30;
}
.topbar .title { font-size: 17px; font-weight: 600; }
.topbar .sub { color: var(--muted); font-size: 13px; margin-left: 2px; flex: 1; }
.icon-btn {
  border: none; background: transparent; color: var(--fg);
  font-size: 18px; padding: 6px 10px; border-radius: 8px; cursor: pointer;
}
.icon-btn:active { background: var(--border); }
.btn {
  border: 1px solid var(--border); background: var(--card); color: var(--fg);
  padding: 9px 18px; border-radius: 10px; font-size: 15px; cursor: pointer;
}
.btn.primary { background: var(--accent); color: #fff; border-color: var(--accent); }
.btn.danger { color: #e53935; border-color: #e53935; background: transparent; }
#login-btn { width: 100%; margin-top: 16px; }

/* ---------- 书库 ---------- */
.book-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  gap: 14px; padding: 16px;
}
.book-card {
  background: var(--card); border: 1px solid var(--border); border-radius: 12px;
  padding: 14px; cursor: pointer; transition: transform .1s;
}
.book-card:active { transform: scale(.97); }
.book-cover {
  height: 150px; border-radius: 8px; margin-bottom: 10px;
  display: flex; align-items: center; justify-content: center;
  font-size: 13px; color: #fff; text-align: center; padding: 8px;
  background: linear-gradient(145deg, #5c6bc0, #283593);
  word-break: break-all; overflow: hidden;
}
.book-card:nth-child(3n+2) .book-cover { background: linear-gradient(145deg, #26a69a, #00695c); }
.book-card:nth-child(3n+3) .book-cover { background: linear-gradient(145deg, #8d6e63, #4e342e); }
.book-name { font-size: 14px; font-weight: 600; word-break: break-all; }
.book-meta { color: var(--muted); font-size: 12px; margin-top: 3px; }
.empty { text-align: center; color: var(--muted); padding: 60px 20px; font-size: 15px; }
.empty .dim { font-size: 13px; margin-top: 6px; }

/* ---------- 阅读 ---------- */
.reader-bar { justify-content: space-between; }
#reader-title { flex: 1; text-align: center; font-size: 16px; }

.page-wrap, .scroll-wrap { flex: 1; position: relative; overflow: hidden; }
.page-content {
  max-width: 780px; margin: 0 auto; padding: 24px 22px 40px;
  font-family: Georgia, "Noto Serif SC", "Songti SC", serif;
  font-size: 19px; line-height: 1.8; color: var(--fg);
  white-space: pre-wrap; word-break: break-word;
}
.page-content p { margin: 0 0 .4em; }
.scroll-content {
  max-width: 780px; margin: 0 auto; padding: 20px 22px 60px;
  font-family: Georgia, "Noto Serif SC", "Songti SC", serif;
  font-size: 19px; line-height: 1.8; color: var(--fg);
  white-space: pre-wrap; word-break: break-word;
  overflow-y: auto; height: calc(100vh - 52px);
}
.page-nav {
  display: flex; align-items: center; justify-content: center; gap: 14px;
  padding: 10px 16px calc(env(safe-area-inset-bottom) + 14px);
  border-top: 1px solid var(--border);
}
.nav-btn {
  border: 1px solid var(--border); background: var(--card); color: var(--fg);
  padding: 8px 22px; border-radius: 999px; font-size: 14px; cursor: pointer;
}
.nav-btn:disabled { opacity: .35; }
.page-ind { color: var(--muted); font-size: 13px; min-width: 60px; text-align: center; }

.chapter-label {
  font-size: 13px; color: var(--muted); text-align: center;
  margin-bottom: 18px; letter-spacing: 2px;
}
@keyframes fadeIn { from { opacity: .3; transform: translateX(10px); } to { opacity: 1; transform: none; } }
.fade-in { animation: fadeIn .22s ease; }

mark {
  padding: 1px 0; border-radius: 2px; cursor: pointer;
  text-decoration: none;
}
mark.c-yellow { background: var(--hl-y); }
mark.c-green  { background: var(--hl-g); }
mark.c-blue   { background: var(--hl-b); }
mark.c-pink   { background: var(--hl-p); }

/* 选中工具条 */
.sel-bar {
  position: fixed; z-index: 60; display: flex; gap: 6px;
  background: #2d2d2d; border-radius: 12px; padding: 7px 9px;
  box-shadow: 0 6px 20px rgba(0,0,0,.35);
  transform: translate(-50%, -100%);
}
.hl-btn { width: 26px; height: 26px; border-radius: 50%; border: 2px solid #fff; cursor: pointer; }
.hl-btn[data-color="yellow"] { background: #ffd54f; }
.hl-btn[data-color="green"]  { background: #81c784; }
.hl-btn[data-color="blue"]   { background: #79c2f4; }
.hl-btn[data-color="pink"]   { background: #f48fb1; }
.note-btn { border: none; background: #fff; border-radius: 8px; font-size: 15px; padding: 0 8px; cursor: pointer; }

/* 面板 */
.panel {
  position: fixed; top: 0; right: 0; bottom: 0; width: min(320px, 88vw);
  background: var(--card); border-left: 1px solid var(--border);
  z-index: 50; overflow-y: auto; padding: calc(env(safe-area-inset-top) + 16px) 18px 24px;
  box-shadow: -8px 0 30px rgba(0,0,0,.1);
  animation: slideIn .18s ease;
}
@keyframes slideIn { from { transform: translateX(30px); opacity: 0; } to { transform: none; opacity: 1; } }
.panel-head {
  display: flex; justify-content: space-between; align-items: center;
  font-size: 16px; font-weight: 600; margin-bottom: 14px;
}
.panel-row {
  display: flex; align-items: center; justify-content: space-between;
  padding: 12px 0; border-bottom: 1px solid var(--border); font-size: 14px;
}
.panel-row input[type=range] { width: 130px; }
.theme-row, .mode-row { display: flex; gap: 8px; }
.theme-dot { width: 28px; height: 28px; border-radius: 50%; border: 2px solid var(--border); cursor: pointer; }
.dot-light { background: #f7f5ef; }
.dot-sepia { background: #f2e8d5; }
.dot-dark { background: #2b2b2b; }
.theme-dot.active { border-color: var(--accent); }
.chip {
  border: 1px solid var(--border); background: transparent; color: var(--fg);
  padding: 6px 14px; border-radius: 999px; font-size: 13px; cursor: pointer;
}
.chip.active { background: var(--accent); color: #fff; border-color: var(--accent); }

.toc-list .toc-item {
  padding: 10px 8px; border-bottom: 1px solid var(--border);
  font-size: 14px; cursor: pointer;
}
.toc-item:active { background: var(--border); }

.ann-list .ann-item {
  padding: 10px 8px; border-bottom: 1px solid var(--border);
  cursor: pointer; font-size: 13px;
}
.ann-item .ann-text {
  color: var(--fg); margin-bottom: 4px;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
}
.ann-item .ann-note {
  color: var(--muted); font-style: italic;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
}
.ann-item .ann-meta { color: var(--muted); font-size: 11px; margin-top: 4px; }
.ann-color-dot { display: inline-block; width: 10px; height: 10px; border-radius: 50%; margin-right: 6px; }

/* 笔记弹层 */
.overlay {
  position: fixed; inset: 0; background: rgba(0,0,0,.45); z-index: 80;
  display: flex; align-items: center; justify-content: center;
}
.note-card {
  width: min(400px, 92vw); background: var(--card); border-radius: 14px;
  padding: 18px; box-shadow: 0 10px 40px rgba(0,0,0,.3);
}
.note-card-head { font-weight: 600; margin-bottom: 10px; }
.note-src {
  background: var(--bg); border-radius: 8px; padding: 10px; font-size: 13px;
  color: var(--muted); max-height: 90px; overflow-y: auto; margin-bottom: 10px;
  border: 1px solid var(--border);
}
.note-card textarea {
  width: 100%; border: 1px solid var(--border); border-radius: 10px;
  padding: 10px; font-size: 15px; background: var(--bg); color: var(--fg);
  resize: vertical; outline: none; font-family: inherit;
}
.note-card-actions { display: flex; gap: 8px; margin-top: 12px; align-items: center; }
.spacer { flex: 1; }

/* ---------- 章节对比 ---------- */
#compare-body { padding: 14px; max-width: 720px; margin: 0 auto; }
#compare-body .card { background: var(--card); border: 1px solid var(--border); border-radius: 14px; padding: 16px; margin-bottom: 14px; }
#compare-body .card h3 { font-size: 14px; margin-bottom: 12px; }
.field { margin-bottom: 12px; }
.field:last-child { margin-bottom: 0; }
.field label { display: block; font-size: 12px; color: var(--muted); margin-bottom: 5px; }
.field select {
  width: 100%; padding: 10px 12px; border: 1px solid var(--border); border-radius: 10px;
  background: var(--card); color: var(--fg); font-size: 13px; outline: none;
}
.field select:focus { border-color: var(--accent); }
#compare-body .hint { font-size: 11px; color: var(--muted); margin-top: 8px; line-height: 1.6; }
#compare-body .btn { padding: 10px 0; width: 100%; border: none; border-radius: 10px; font-size: 14px; cursor: pointer; }
#compare-body .btn.primary { background: var(--accent); color: #fff; }
#compare-body .btn.primary:disabled { opacity: .6; }

.stat { display: flex; gap: 8px; margin-bottom: 12px; font-size: 12px; flex-wrap: wrap; }
.stat span { padding: 4px 10px; border-radius: 8px; border: 1px solid var(--border); background: var(--card); }
.stat .s-add { color: #2e7d32; border-color: #81c784; background: #e8f5e9; }
.stat .s-del { color: #c62828; border-color: #ef9a9a; background: #ffebee; }
.stat .s-rep { color: #7e57c2; border-color: #b39ddb; background: #f3e5f5; }
.stat .s-same { color: var(--muted); }

.diff { font-family: "Songti SC", "SimSun", serif; font-size: 15px; line-height: 1.9; background: var(--card); border: 1px solid var(--border); border-radius: 14px; padding: 12px; }
.d-row { padding: 2px 10px; border-radius: 6px; margin: 2px 0; white-space: pre-wrap; word-break: break-word; }
.d-add { background: #e8f5e9; }
.d-add::before { content: "+"; color: #2e7d32; font-family: monospace; margin-right: 6px; font-weight: 700; }
.d-del { background: #ffebee; }
.d-del::before { content: "−"; color: #c62828; font-family: monospace; margin-right: 6px; font-weight: 700; }
.d-same { color: var(--muted); font-size: 12px; text-align: center; padding: 6px; cursor: pointer; user-select: none; border-radius: 8px; }
.d-same:hover { background: var(--border); }
.d-same-body .d-row { color: var(--muted); }
.d-replace { border: 1px dashed #b39ddb; border-radius: 8px; margin: 6px 0; padding: 4px 0; }
.d-replace .tag { font-size: 10px; color: #7e57c2; padding: 0 8px; }
.ann-bubble {
  background: #fff8e1; border: 1px solid #ffd54f; border-radius: 10px;
  padding: 8px 12px; font-size: 12px; color: #8d6e63; margin: 8px 0;
  line-height: 1.6;
}
.ann-bubble b { color: #5d4037; }
.theme-dark .d-add { background: #1b3a24; }
.theme-dark .d-del { background: #3d1f22; }
.theme-dark .d-replace { border-color: #7e57c2; }
.theme-dark .ann-bubble { background: #3d3220; border-color: #8d6e63; color: #d6c9a8; }