/* ============================================================ tokens ==== */
:root {
  --bg: #f4f1ea;
  --surface: #fffdf9;
  --surface-2: #f7f3ea;
  --ink: #1f2328;
  --ink-2: #5c6067;
  --muted: #8a8f98;
  --line: #e6e1d5;
  --accent: #2a78d6;          /* validated series/accent hue (light) */
  --accent-ink: #fffdf9;
  --danger: #d03b3b;
  --radius: 10px;
  --shadow: 0 4px 18px rgba(30, 30, 40, 0.12);
  --shadow-lg: 0 10px 40px rgba(30, 30, 40, 0.2);
  --chart-bar: #2a78d6;
  --hl-yellow: rgba(242, 201, 76, 0.45);
  --hl-green: rgba(111, 207, 151, 0.45);
  --hl-blue: rgba(86, 204, 242, 0.45);
  --hl-pink: rgba(242, 120, 159, 0.45);
}

* { box-sizing: border-box; }

/* The hidden attribute must always win, even over display:flex/grid rules. */
[hidden] { display: none !important; }

html, body {
  margin: 0;
  height: 100%;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--ink);
  -webkit-font-smoothing: antialiased;
  -webkit-tap-highlight-color: transparent;
}

button {
  font: inherit;
  color: inherit;
  background: none;
  border: none;
  cursor: pointer;
  touch-action: manipulation; /* no 300ms delay / double-tap zoom on controls */
}

input, select, textarea { font: inherit; color: inherit; }

h1, h2, h3 { margin: 0; font-weight: 650; }

/* ========================================================== buttons ===== */
.primary-btn {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  background: var(--accent);
  color: var(--accent-ink);
  padding: 9px 16px;
  border-radius: var(--radius);
  font-weight: 600;
  transition: filter 0.15s;
}
.primary-btn:hover { filter: brightness(1.08); }

.ghost-btn {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 8px 14px;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--ink-2);
  font-weight: 550;
}
.ghost-btn:hover { color: var(--ink); border-color: var(--muted); }

.icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border-radius: 8px;
  color: inherit;
  opacity: 0.75;
}
.icon-btn:hover { opacity: 1; background: rgba(127, 127, 127, 0.12); }

.danger { color: var(--danger); }

/* ============================================================= auth ===== */
#auth-view {
  position: fixed;
  inset: 0;
  z-index: 5;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg);
  padding: 20px;
}

.auth-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 18px;
  box-shadow: var(--shadow);
  width: min(380px, 100%);
  padding: 36px 32px 28px;
  text-align: center;
}

.brand-center { justify-content: center; }

.auth-sub { color: var(--muted); margin: 8px 0 22px; font-size: 14px; }

#auth-form { display: flex; flex-direction: column; gap: 10px; }
#auth-form input {
  padding: 11px 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  outline: none;
}
#auth-form input:focus { border-color: var(--accent); }
#auth-form .primary-btn { justify-content: center; margin-top: 4px; }

#auth-error { color: var(--danger); font-size: 13px; text-align: left; }

#auth-toggle { margin-top: 16px; color: var(--accent); font-size: 13.5px; }
#auth-toggle:hover { text-decoration: underline; }

#user-chip {
  font-size: 13px;
  color: var(--ink-2);
  max-width: 180px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  padding-left: 6px;
}

/* ========================================================== library ===== */
#library-view {
  max-width: 1180px;
  margin: 0 auto;
  padding: 22px 28px 60px;
}

.lib-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  flex-wrap: wrap;
  padding-bottom: 20px;
}

.brand { display: flex; align-items: center; gap: 10px; }
.brand h1 { font-size: 22px; letter-spacing: 0.2px; }
.brand svg { border-radius: 7px; }

.lib-controls { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }

#lib-search {
  width: 220px;
  padding: 9px 13px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  outline: none;
}
#lib-search:focus { border-color: var(--accent); }

#lib-sort {
  padding: 9px 10px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--ink-2);
}

.book-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(158px, 1fr));
  gap: 22px;
}

.book-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 14px;
  overflow: hidden;
  cursor: pointer;
  transition: transform 0.15s, box-shadow 0.15s;
}
.book-card:hover, .book-card:focus-visible {
  transform: translateY(-3px);
  box-shadow: var(--shadow);
  outline: none;
}

.card-cover-wrap { position: relative; aspect-ratio: 2 / 3; background: var(--surface-2); }

.card-cover {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.card-cover-ph {
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 34px;
  font-weight: 700;
  color: rgba(255, 253, 249, 0.92);
  letter-spacing: 1px;
}

.card-badge {
  position: absolute;
  left: 8px;
  bottom: 8px;
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.6px;
  background: rgba(20, 22, 26, 0.62);
  color: #fffdf9;
  padding: 3px 7px;
  border-radius: 6px;
}

.card-menu-btn {
  position: absolute;
  top: 6px;
  right: 6px;
  background: rgba(20, 22, 26, 0.5);
  color: #fffdf9;
  opacity: 0;
  transition: opacity 0.15s;
}
.book-card:hover .card-menu-btn, .card-menu-btn:focus-visible { opacity: 1; }

.card-info { padding: 10px 12px 12px; }

.card-title {
  font-weight: 620;
  font-size: 14px;
  line-height: 1.3;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  min-height: 2.6em;
}

.card-author {
  font-size: 12px;
  color: var(--muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  margin-top: 2px;
  min-height: 1.2em;
}

.card-progress {
  height: 4px;
  border-radius: 3px;
  background: var(--surface-2);
  margin-top: 9px;
  overflow: hidden;
}
.card-progress-fill { height: 100%; background: var(--accent); border-radius: 3px; }

.card-meta {
  display: flex;
  justify-content: space-between;
  font-size: 11.5px;
  color: var(--muted);
  margin-top: 6px;
}

.card-menu {
  position: fixed;
  z-index: 80;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  padding: 5px;
  min-width: 190px;
}
.card-menu button {
  display: block;
  width: 100%;
  text-align: left;
  padding: 9px 12px;
  border-radius: 7px;
  font-size: 14px;
}
.card-menu button:hover { background: var(--surface-2); }

.lib-empty {
  text-align: center;
  padding: 90px 20px;
  color: var(--ink-2);
}
.lib-empty h2 { margin: 18px 0 6px; color: var(--ink); }
.lib-empty p { margin: 0 0 18px; }

#drop-overlay {
  position: fixed;
  inset: 0;
  z-index: 100;
  background: rgba(42, 120, 214, 0.14);
  backdrop-filter: blur(2px);
  display: flex;
  align-items: center;
  justify-content: center;
  pointer-events: none;
}
.drop-inner {
  background: var(--surface);
  border: 2px dashed var(--accent);
  border-radius: 16px;
  padding: 30px 44px;
  font-size: 17px;
  font-weight: 600;
  color: var(--accent);
  box-shadow: var(--shadow-lg);
}

/* ============================================================ modal ===== */
.modal-scrim {
  position: fixed;
  inset: 0;
  z-index: 90;
  background: rgba(20, 22, 26, 0.45);
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding: 7vh 16px;
  overflow-y: auto;
}

.modal {
  background: var(--surface);
  border-radius: 16px;
  box-shadow: var(--shadow-lg);
  width: min(560px, 100%);
  padding: 20px 24px 26px;
}

.modal-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}
.modal h3 { font-size: 13px; color: var(--ink-2); margin: 20px 0 10px; text-transform: uppercase; letter-spacing: 0.5px; }

/* ------- stat tiles: values wear ink, never series color -------------- */
.stat-tiles {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(110px, 1fr));
  gap: 10px;
}
.stat-tile {
  background: var(--surface-2);
  border-radius: 12px;
  padding: 13px 14px;
  display: flex;
  flex-direction: column;
  gap: 3px;
}
.stat-val { font-size: 22px; font-weight: 700; color: var(--ink); }
.stat-sub { font-size: 14px; font-weight: 500; color: var(--muted); }
.stat-label { font-size: 12px; color: var(--ink-2); }

/* ------- 14-day bar chart (single series, validated hue) --------------- */
.chart {
  display: flex;
  align-items: flex-end;
  gap: 6px;
  height: 120px;
  border-bottom: 1px solid var(--line);   /* recessive baseline */
  padding: 18px 2px 0;
}
.chart-col {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-end;
  height: 100%;
  position: relative;
  min-width: 0;
}
.chart-bar {
  width: min(100%, 18px);
  background: var(--chart-bar);
  border-radius: 4px 4px 0 0;             /* rounded data-end, flat baseline */
  position: relative;
  transition: filter 0.12s;
}
.chart-bar.zero { background: var(--line); }
.chart-bar:hover { filter: brightness(1.12); }
.chart-tip {
  display: none;
  position: absolute;
  bottom: calc(100% + 6px);
  left: 50%;
  transform: translateX(-50%);
  background: var(--ink);
  color: var(--surface);
  font-size: 11px;
  padding: 4px 8px;
  border-radius: 6px;
  white-space: nowrap;
  z-index: 5;
  pointer-events: none;
}
.chart-bar:hover .chart-tip { display: block; }
.chart-val {
  position: absolute;
  top: -4px;
  font-size: 10.5px;
  color: var(--ink-2);                    /* labels wear text tokens */
  white-space: nowrap;
}
.chart-day { font-size: 10.5px; color: var(--muted); margin-top: 5px; }

.chart-data { margin-top: 10px; font-size: 13px; color: var(--ink-2); }
.chart-data summary { cursor: pointer; }
.chart-data table { width: 100%; border-collapse: collapse; margin-top: 8px; }
.chart-data th, .chart-data td {
  text-align: left;
  padding: 4px 8px;
  border-bottom: 1px solid var(--line);
  font-variant-numeric: tabular-nums;
}

.stats-top .top-row {
  display: flex;
  justify-content: space-between;
  gap: 14px;
  padding: 7px 0;
  border-bottom: 1px solid var(--line);
  font-size: 14px;
}
.top-title { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.top-time { color: var(--ink-2); flex-shrink: 0; }

/* =========================================================== toasts ===== */
#toasts {
  position: fixed;
  bottom: 18px;
  right: 18px;
  z-index: 200;
  display: flex;
  flex-direction: column;
  gap: 8px;
  max-width: 340px;
}
.toast {
  background: var(--ink);
  color: var(--surface);
  padding: 11px 15px;
  border-radius: 10px;
  font-size: 13.5px;
  box-shadow: var(--shadow);
  transition: opacity 0.3s, transform 0.3s;
}
.toast-error { background: var(--danger); color: #fff; }
.toast.gone { opacity: 0; transform: translateY(6px); }

/* ====================================================== reader themes === */
#reader-view {
  --r-bg: #efece4;
  --r-surface: #faf9f6;
  --r-chrome: #fffdf9;
  --r-ink: #1f2328;
  --r-ink-2: #5c6067;
  --r-line: #e6e1d5;
  position: fixed;
  inset: 0;
  z-index: 10;
  display: flex;
  flex-direction: column;
  background: var(--r-bg);
  color: var(--r-ink);
}
#reader-view[data-theme="sepia"] {
  --r-bg: #eadfc6;
  --r-surface: #f4ecd8;
  --r-chrome: #f8f1e0;
  --r-ink: #453723;
  --r-ink-2: #7a6a50;
  --r-line: #ddd0b3;
}
#reader-view[data-theme="dark"] {
  --r-bg: #101317;
  --r-surface: #15181c;
  --r-chrome: #1a1e24;
  --r-ink: #d5d1c9;
  --r-ink-2: #8f939b;
  --r-line: #2b3038;
  --hl-yellow: rgba(242, 201, 76, 0.3);
  --hl-green: rgba(111, 207, 151, 0.3);
  --hl-blue: rgba(86, 204, 242, 0.3);
  --hl-pink: rgba(242, 120, 159, 0.3);
}

/* ------------------------------------------------------- reader chrome -- */
.reader-top {
  display: flex;
  align-items: center;
  gap: 12px;
  height: 52px;
  padding: 0 12px;
  background: var(--r-chrome);
  border-bottom: 1px solid var(--r-line);
  flex-shrink: 0;
  z-index: 30;
}

.reader-heading {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  line-height: 1.25;
}
#r-title {
  font-weight: 630;
  font-size: 14px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
#r-chapter {
  font-size: 12px;
  color: var(--r-ink-2);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.reader-actions { display: flex; align-items: center; gap: 2px; }

.reader-body { flex: 1; min-height: 0; position: relative; }

.reader-stage-wrap { position: relative; height: 100%; }

#r-stage { position: absolute; inset: 0; }

.nav-arrow {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  z-index: 20;
  font-size: 34px;
  color: var(--r-ink-2);
  opacity: 0;
  width: 48px;
  height: 90px;
  border-radius: 12px;
  transition: opacity 0.15s;
}
.nav-arrow.left { left: 6px; }
.nav-arrow.right { right: 6px; }
.reader-stage-wrap:hover .nav-arrow { opacity: 0.55; }
.nav-arrow:hover { opacity: 1 !important; background: rgba(127, 127, 127, 0.1); }

.reader-bottom {
  display: flex;
  align-items: center;
  gap: 14px;
  height: calc(44px + env(safe-area-inset-bottom, 0px));
  padding: 0 18px env(safe-area-inset-bottom, 0px);
  background: var(--r-chrome);
  border-top: 1px solid var(--r-line);
  flex-shrink: 0;
  z-index: 30;
}
#r-slider {
  flex: 1;
  accent-color: var(--accent);
  height: 4px;
}
#r-slider:disabled { opacity: 0.4; }
#r-pct {
  font-size: 12.5px;
  color: var(--r-ink-2);
  min-width: 38px;
  text-align: right;
  font-variant-numeric: tabular-nums;
}

#r-scrim {
  position: fixed;
  inset: 0;
  z-index: 40;
  background: rgba(15, 17, 20, 0.35);
}

/* ---------------------------------------------------------- sidebar ----- */
#r-sidebar {
  position: fixed;
  top: 0;
  bottom: 0;
  left: 0;
  width: min(340px, 88vw);
  z-index: 50;
  background: var(--r-chrome);
  border-right: 1px solid var(--r-line);
  transform: translateX(-100%);
  transition: transform 0.22s ease;
  display: flex;
  flex-direction: column;
}
#r-sidebar.open { transform: translateX(0); box-shadow: var(--shadow-lg); }

.side-tabs {
  display: flex;
  border-bottom: 1px solid var(--r-line);
  flex-shrink: 0;
}
.tab-btn {
  flex: 1;
  padding: 13px 4px;
  font-size: 12.5px;
  font-weight: 600;
  color: var(--r-ink-2);
  border-bottom: 2px solid transparent;
}
.tab-btn.active { color: var(--accent); border-bottom-color: var(--accent); }

.side-panels { flex: 1; overflow-y: auto; }
.side-panel { padding: 10px; }

.side-empty { padding: 26px 14px; text-align: center; color: var(--r-ink-2); font-size: 13.5px; }

.toc-item {
  display: block;
  width: 100%;
  text-align: left;
  padding: 9px 10px;
  border-radius: 8px;
  font-size: 13.5px;
  line-height: 1.35;
  color: var(--r-ink);
}
.toc-item:hover { background: rgba(127, 127, 127, 0.1); }
.toc-item.depth-1 { padding-left: 24px; font-size: 13px; color: var(--r-ink-2); }
.toc-item.depth-2 { padding-left: 38px; font-size: 12.5px; color: var(--r-ink-2); }
.toc-item.depth-3 { padding-left: 52px; font-size: 12.5px; color: var(--r-ink-2); }

.hl-item, .bm-item {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  padding: 10px;
  border-radius: 10px;
  cursor: pointer;
}
.hl-item:hover, .bm-item:hover { background: rgba(127, 127, 127, 0.1); }

.hl-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  margin-top: 5px;
  flex-shrink: 0;
}
.dot-yellow { background: #f2c94c; }
.dot-green { background: #6fcf97; }
.dot-blue { background: #56ccf2; }
.dot-pink { background: #f2789f; }

.hl-body { flex: 1; min-width: 0; }
.hl-text { font-size: 13px; line-height: 1.45; }
.hl-note {
  font-size: 12.5px;
  color: var(--r-ink-2);
  margin-top: 4px;
  padding-left: 8px;
  border-left: 2px solid var(--r-line);
}
.hl-del, .bm-del { width: 26px; height: 26px; font-size: 12px; flex-shrink: 0; }

.bm-icon { font-size: 14px; margin-top: 1px; }
.bm-label { flex: 1; font-size: 13.5px; line-height: 1.4; }

#r-search-input {
  width: 100%;
  padding: 9px 12px;
  border: 1px solid var(--r-line);
  border-radius: 9px;
  background: var(--r-surface);
  color: var(--r-ink);
  outline: none;
  margin-bottom: 8px;
}
#r-search-input:focus { border-color: var(--accent); }

.search-item {
  display: block;
  width: 100%;
  text-align: left;
  padding: 9px 10px;
  border-radius: 8px;
}
.search-item:hover { background: rgba(127, 127, 127, 0.1); }
.search-label { display: block; font-size: 11.5px; font-weight: 650; color: var(--accent); }
.search-excerpt { display: block; font-size: 12.5px; color: var(--r-ink); line-height: 1.4; margin-top: 2px; }

/* ------------------------------------------------------ settings drawer - */
#r-drawer {
  position: fixed;
  top: 0;
  bottom: 0;
  right: 0;
  width: min(300px, 86vw);
  z-index: 50;
  background: var(--r-chrome);
  border-left: 1px solid var(--r-line);
  transform: translateX(100%);
  transition: transform 0.22s ease;
  padding: 20px;
  overflow-y: auto;
}
#r-drawer.open { transform: translateX(0); box-shadow: var(--shadow-lg); }
#r-drawer h3 { font-size: 15px; margin-bottom: 16px; }

.set-row { margin-bottom: 18px; }
.set-row > label { display: block; font-size: 12.5px; color: var(--r-ink-2); margin-bottom: 7px; }
.set-row select {
  width: 100%;
  padding: 8px 10px;
  border: 1px solid var(--r-line);
  border-radius: 8px;
  background: var(--r-surface);
  color: var(--r-ink);
}
.set-row input[type="range"] { width: 100%; accent-color: var(--accent); }

.set-themes { display: flex; gap: 8px; }
.theme-chip {
  flex: 1;
  padding: 10px 4px;
  border-radius: 9px;
  border: 2px solid var(--r-line);
  font-size: 12.5px;
  font-weight: 600;
}
.theme-chip.active { border-color: var(--accent); }
.chip-light { background: #faf9f6; color: #1f2328; }
.chip-sepia { background: #f4ecd8; color: #453723; }
.chip-dark { background: #15181c; color: #d5d1c9; }

.stepper {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border: 1px solid var(--r-line);
  border-radius: 9px;
  padding: 2px 6px;
  background: var(--r-surface);
}
.stepper span { font-size: 13.5px; font-variant-numeric: tabular-nums; }

.radio-row { display: flex; gap: 16px; font-size: 13.5px; }
.radio-row label { display: flex; align-items: center; gap: 6px; }
.radio-row input { accent-color: var(--accent); }

/* --------------------------------------------------------- floating ----- */
.floating {
  position: fixed;
  z-index: 60;
  background: var(--r-chrome, var(--surface));
  border: 1px solid var(--r-line, var(--line));
  border-radius: 12px;
  box-shadow: var(--shadow-lg);
}

.pill {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 7px 10px;
  border-radius: 999px;
}

.color-dot {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  border: 2px solid rgba(0, 0, 0, 0.12);
  transition: transform 0.12s;
}
.color-dot:hover { transform: scale(1.18); }

.pill-sep { width: 1px; height: 18px; background: var(--r-line, var(--line)); }

.pill-btn {
  font-size: 12.5px;
  font-weight: 600;
  padding: 5px 8px;
  border-radius: 7px;
  color: var(--r-ink, var(--ink));
}
.pill-btn:hover { background: rgba(127, 127, 127, 0.12); }

/* dictionary popup */
#dict-pop {
  width: min(360px, calc(100vw - 24px));
  max-height: 46vh;
  overflow-y: auto;
  padding: 14px 16px;
}
.dict-head { display: flex; align-items: center; gap: 9px; flex-wrap: wrap; }
.dict-word { font-size: 17px; font-weight: 700; }
.dict-phon { color: var(--r-ink-2, var(--ink-2)); font-size: 13.5px; }
.dict-audio { width: 26px; height: 26px; font-size: 13px; }
.dict-loading, .dict-empty {
  color: var(--r-ink-2, var(--ink-2));
  font-size: 13.5px;
  padding: 10px 0 2px;
}
.dict-meaning { margin-top: 10px; }
.dict-pos {
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.6px;
  color: var(--accent);
}
.dict-meaning ol { margin: 6px 0 0; padding-left: 20px; }
.dict-meaning li { font-size: 13.5px; line-height: 1.5; margin-bottom: 5px; }
.dict-example { color: var(--r-ink-2, var(--ink-2)); font-size: 12.5px; margin-top: 2px; }
.dict-syns { margin-top: 6px; display: flex; flex-wrap: wrap; gap: 5px; }
.dict-actions {
  display: flex;
  align-items: center;
  gap: 9px;
  margin-top: 13px;
  padding-top: 11px;
  border-top: 1px solid var(--r-line, var(--line));
}
.dict-actions-label {
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.6px;
  color: var(--r-ink-2, var(--ink-2));
  margin-right: 2px;
}
.dict-note-btn { margin-left: auto; }
.dict-syn {
  font-size: 12px;
  padding: 3px 9px;
  border-radius: 999px;
  background: rgba(42, 120, 214, 0.1);
  color: var(--accent);
}
.dict-syn:hover { background: rgba(42, 120, 214, 0.2); }

/* note editor */
#note-pop {
  left: 50%;
  top: 26%;
  transform: translateX(-50%);
  width: min(380px, calc(100vw - 24px));
  padding: 14px;
}
#note-text {
  width: 100%;
  resize: vertical;
  border: 1px solid var(--r-line, var(--line));
  border-radius: 9px;
  background: var(--r-surface, var(--surface));
  color: var(--r-ink, var(--ink));
  padding: 10px;
  outline: none;
}
#note-text:focus { border-color: var(--accent); }
.note-actions { display: flex; justify-content: flex-end; gap: 8px; margin-top: 10px; }

/* ======================================================== TXT reader ==== */
.txt-stage {
  position: absolute;
  inset: 0;
  overflow-y: auto;
  background: var(--r-surface);
}
.txt-content {
  max-width: 44em;
  margin: 0 auto;
  padding: 44px 28px 70vh;
  color: var(--r-ink);
}
.txt-content p { margin: 0 0 1em; }

mark.txt-hl { color: inherit; border-radius: 2px; padding: 0.06em 0; cursor: pointer; }
mark.hl-yellow { background: var(--hl-yellow); }
mark.hl-green { background: var(--hl-green); }
mark.hl-blue { background: var(--hl-blue); }
mark.hl-pink { background: var(--hl-pink); }

.txt-content p.flash { animation: flash-bg 1.6s ease; }
@keyframes flash-bg {
  0%, 40% { background: rgba(42, 120, 214, 0.16); }
  100% { background: transparent; }
}

/* ======================================================== PDF reader ==== */
.pdf-stage {
  position: absolute;
  inset: 0;
  overflow: auto;
  display: flex;
  justify-content: center;
  padding: 22px 0;
  background: var(--r-bg);
}

.pdf-page {
  position: relative;
  margin: 0 auto;
  align-self: flex-start;
  background: #fff;
  box-shadow: var(--shadow);
}
.pdf-page canvas { display: block; }

.pdf-hl-layer { position: absolute; inset: 0; z-index: 1; pointer-events: none; }
.pdf-hl {
  position: absolute;
  opacity: 0.42;
  mix-blend-mode: multiply;
  border-radius: 2px;
}
#reader-view[data-theme="dark"] .pdf-hl { mix-blend-mode: normal; opacity: 0.35; }

/* Essential PDF.js text-layer rules (subset of pdf_viewer.css). */
.textLayer {
  position: absolute;
  inset: 0;
  z-index: 2;
  overflow: hidden;
  line-height: 1;
  text-align: initial;
  transform-origin: 0 0;
  caret-color: CanvasText;
  forced-color-adjust: none;
}
.textLayer :is(span, br) {
  color: transparent;
  position: absolute;
  white-space: pre;
  cursor: text;
  transform-origin: 0% 0%;
}
.textLayer ::selection { background: rgba(42, 120, 214, 0.32); }

/* PDF.js lays the text layer out in unrotated page space and marks the
   container with data-main-rotation; these rules re-align rotated pages. */
.textLayer[data-main-rotation="90"] { transform: rotate(90deg) translateY(-100%); }
.textLayer[data-main-rotation="180"] { transform: rotate(180deg) translate(-100%, -100%); }
.textLayer[data-main-rotation="270"] { transform: rotate(270deg) translateX(-100%); }

/* ======================================================== responsive ==== */
/* Touch devices: no hover — reveal hover-gated controls, grow hit targets,
   drop hover-only affordances (swipe/edge-tap replace the arrows). */
@media (hover: none) {
  .card-menu-btn { opacity: 1; }
  .nav-arrow { display: none; }
  .icon-btn { width: 40px; height: 40px; }
  .color-dot { width: 26px; height: 26px; }
  .pill-btn { padding: 8px 10px; }
}

@media (max-width: 640px) {
  #library-view { padding: 16px 14px 40px; }
  .lib-top { flex-direction: column; align-items: stretch; }
  .lib-controls { justify-content: stretch; }
  #lib-search { flex: 1; width: auto; }
  .book-grid { grid-template-columns: repeat(auto-fill, minmax(124px, 1fr)); gap: 14px; }
  .nav-arrow { display: none; }
  .reader-top { padding: 0 6px; gap: 6px; }
  #r-title { font-size: 13px; }
}