*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --font-serif: "Source Han Serif SC", "思源宋体", "Source Han Serif CN", "Noto Serif SC", "Songti SC", "STSong", "SimSun", serif;
  --font-sans: var(--font-serif);
  --accent: #6f5b45;
  --accent-hover: #5a4632;
  --accent-warm: #c8943e;
  --accent-light: #ede5da;
  --accent-cream: #e0cfb5;
  --bg: #f7f3f0;
  --bg-paper: #ebe5df;
  --bg-card: #ffffff;
  --ink: #2c2416;
  --ink-soft: #6b6155;
  --ink-hint: #968b7e;
  --border: rgba(94, 80, 63, 0.1);
  --border-strong: rgba(94, 80, 63, 0.18);
  --shadow-sm: 0 1px 3px rgba(94, 80, 63, 0.07), 0 0 0 0.5px rgba(94, 80, 63, 0.05);
  --danger: #b85a46;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-serif);
  -webkit-font-smoothing: antialiased;
  background: var(--bg);
  min-height: 100vh;
  display: flex;
  color: var(--ink);
}

button,
a {
  font: inherit;
}

.hidden {
  display: none !important;
}

.main {
  margin-left: var(--app-sidebar-width, 82px);
  flex: 1;
  display: flex;
  justify-content: center;
  padding: 44px 48px 80px;
  overflow-y: auto;
}

.content {
  width: 100%;
  max-width: 980px;
}

.page-head {
  margin-bottom: 28px;
}

.page-title {
  font-size: 26px;
  font-weight: 500;
  color: var(--ink);
  letter-spacing: 0.02em;
  line-height: 1.2;
}

.page-controls {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 10px;
  gap: 16px;
  flex-wrap: wrap;
}

.stat-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 16px 7px 12px;
  background: var(--bg-paper);
  border: 0.5px solid var(--border-strong);
  border-radius: 999px;
  font-size: 13px;
  color: var(--ink-soft);
  letter-spacing: 0.01em;
}

.stat-pill svg {
  width: 13px;
  height: 13px;
  color: var(--accent);
  flex-shrink: 0;
}

.stat-pill strong {
  color: var(--ink);
  font-weight: 600;
}

.filter-bar {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
}

.filter-chip {
  height: 28px;
  padding: 0 12px;
  background: transparent;
  border: 0.5px solid var(--border-strong);
  border-radius: 999px;
  font-size: 12.5px;
  color: var(--ink-soft);
  font-family: var(--font-sans);
  cursor: pointer;
  transition: all 0.16s ease;
  display: flex;
  align-items: center;
  gap: 5px;
}

.filter-chip:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.filter-chip.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

.chip-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  flex-shrink: 0;
  background: currentColor;
}

.notes-message {
  margin: 0 0 18px;
  padding: 10px 14px;
  border: 0.5px solid rgba(200, 148, 62, 0.34);
  border-radius: 8px;
  background: rgba(200, 148, 62, 0.08);
  color: var(--ink-soft);
  font-family: var(--font-sans);
  font-size: 13px;
}

.notes-message.is-error {
  border-color: rgba(184, 90, 70, 0.38);
  background: rgba(184, 90, 70, 0.1);
  color: #8f3f2e;
}

.book-group {
  margin-top: 36px;
}

.book-group:first-child {
  margin-top: 0;
}

.book-group-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
}

.book-group-left {
  display: flex;
  align-items: center;
  gap: 10px;
}

.book-swatch {
  width: 4px;
  height: 22px;
  border-radius: 2px;
  flex-shrink: 0;
  background: var(--book-color, var(--accent-cream));
}

.book-name {
  font-size: 17px;
  font-weight: 500;
  color: var(--ink);
  letter-spacing: 0.02em;
}

.book-note-count {
  font-size: 12px;
  color: var(--ink-hint);
  font-family: var(--font-sans);
  letter-spacing: 0.04em;
}

.chapter-section {
  margin-bottom: 8px;
}

.chapter-label {
  font-size: 12px;
  color: var(--ink-hint);
  letter-spacing: 0.08em;
  font-family: var(--font-sans);
  font-weight: 500;
  text-transform: uppercase;
  padding: 10px 0 6px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.chapter-label::after {
  content: "";
  flex: 1;
  height: 0.5px;
  background: var(--border);
}

.note-row {
  display: flex;
  align-items: flex-start;
  gap: 0;
  padding: 13px 16px;
  background: var(--bg-card);
  border: 0.5px solid var(--border);
  border-radius: 10px;
  margin-bottom: 6px;
  transition: all 0.18s ease;
  position: relative;
  overflow: hidden;
}

.note-row::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--book-color, var(--accent-cream));
  border-radius: 10px 0 0 10px;
}

.note-row:hover {
  border-color: var(--border-strong);
  box-shadow: var(--shadow-sm);
  background: #fefcf9;
}

.note-row:hover .note-delete,
.note-row:focus-within .note-delete {
  opacity: 1;
}

.note-icon {
  flex-shrink: 0;
  width: 22px;
  height: 22px;
  margin-right: 12px;
  margin-top: 1px;
  display: grid;
  place-items: center;
  color: var(--accent-cream);
}

.note-icon svg {
  width: 14px;
  height: 14px;
}

.note-text {
  flex: 1;
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink);
  letter-spacing: 0;
  word-break: break-word;
}

.note-time {
  margin-top: 6px;
  color: var(--ink-hint);
  font-family: var(--font-sans);
  font-size: 11px;
  letter-spacing: 0.04em;
}

.note-delete {
  flex-shrink: 0;
  margin-left: 16px;
  margin-top: 2px;
  width: 28px;
  height: 28px;
  border-radius: 6px;
  background: none;
  border: 0;
  display: grid;
  place-items: center;
  color: var(--ink-hint);
  cursor: pointer;
  opacity: 0;
  transition: all 0.16s ease;
}

.note-delete:hover {
  color: var(--danger);
  background: rgba(184, 90, 70, 0.07);
}

.note-delete svg {
  width: 14px;
  height: 14px;
}

.note-row.removing {
  opacity: 0;
  transform: translateX(6px);
  transition: opacity 0.2s ease, transform 0.2s ease;
  pointer-events: none;
}

.empty-state {
  text-align: center;
  padding: 64px 0;
  color: var(--ink-hint);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}

.empty-icon {
  width: 48px;
  height: 48px;
  border: 1.5px dashed var(--accent-cream);
  border-radius: 50%;
  display: grid;
  place-items: center;
  color: var(--accent-cream);
  margin-bottom: 4px;
}

.empty-icon svg {
  width: 20px;
  height: 20px;
}

.empty-title {
  font-size: 16px;
  font-weight: 500;
  color: var(--ink-soft);
}

.empty-sub {
  font-size: 13px;
  color: var(--ink-hint);
  line-height: 1.7;
  font-family: var(--font-sans);
  max-width: 260px;
}

@media (max-width: 760px) {
  body {
    font-size: 12px;
  }

  .main {
    padding: 32px 20px 70px;
  }

  .page-title {
    font-size: 21px;
  }

  .stat-pill,
  .filter-chip,
  .book-note-count,
  .chapter-label,
  .empty-sub,
  .notes-message {
    font-size: 11px;
  }

  .book-name,
  .story-title,
  .empty-title {
    font-size: 14px;
  }

  .note-text {
    font-size: 13px;
    line-height: 1.65;
  }

  .note-time {
    font-size: 10px;
  }
}