:root {
  color-scheme: light;
  --ink: #1f2328;
  --muted: #68717b;
  --line: #d8d5cd;
  --paper: #f5f2ea;
  --panel: #fffdf8;
  --panel-2: #ece7dc;
  --accent: #0f766e;
  --accent-2: #b84a2b;
  --focus: #1c6dd0;
  --shadow: 0 16px 42px rgba(38, 35, 28, 0.12);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-width: 320px;
  background:
    linear-gradient(90deg, rgba(31, 35, 40, 0.035) 1px, transparent 1px),
    linear-gradient(0deg, rgba(31, 35, 40, 0.03) 1px, transparent 1px),
    var(--paper);
  background-size: 24px 24px;
  color: var(--ink);
  font-family: "Avenir Next", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

button,
input {
  font: inherit;
}

button {
  min-height: 36px;
  border: 1px solid var(--line);
  background: var(--panel);
  color: var(--ink);
  cursor: pointer;
}

button:hover,
.import-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}

button:focus-visible,
input:focus-visible,
.import-btn:focus-within {
  outline: 2px solid var(--focus);
  outline-offset: 2px;
}

.app-shell {
  display: grid;
  grid-template-columns: 252px 1fr;
  min-height: 100vh;
}

body.rail-hidden .app-shell {
  grid-template-columns: 1fr;
}

body.rail-hidden .rail {
  display: none;
}

.rail {
  position: sticky;
  top: 0;
  height: 100vh;
  overflow: auto;
  border-right: 1px solid var(--line);
  background: rgba(255, 253, 248, 0.92);
  backdrop-filter: blur(16px);
  padding: 12px;
}

.toolbar-title {
  display: flex;
  gap: 10px;
  align-items: center;
  min-width: 0;
}

.toolbar-right {
  display: flex;
  gap: 8px;
  align-items: center;
  justify-content: flex-end;
  min-width: 0;
}

.rail-toggle {
  display: grid;
  place-items: center;
  width: 34px;
  min-width: 34px;
  min-height: 34px;
  padding: 0;
}

body.rail-hidden .rail-toggle {
  border-color: var(--accent);
  background: var(--accent);
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border: 2px solid var(--ink);
  background: var(--accent);
  color: white;
  font-weight: 800;
  letter-spacing: 0;
}

.sidebar-icon {
  position: relative;
  display: grid;
  gap: 3px;
  width: 16px;
  padding-left: 6px;
}

.sidebar-icon::before {
  content: "";
  position: absolute;
  inset: -4px auto -4px 0;
  width: 3px;
  border-radius: 1px;
  background: var(--accent);
}

.sidebar-icon span {
  display: block;
  height: 2px;
  background: var(--ink);
}

body.rail-hidden .sidebar-icon::before,
body.rail-hidden .sidebar-icon span {
  background: white;
}

h1,
h2,
p {
  margin: 0;
}

h2 {
  margin-top: 2px;
  font-size: 22px;
  line-height: 1.15;
}

.eyebrow,
.field span,
.stats span,
.card-meta,
.category-subtitle {
  color: var(--muted);
  font-size: 11px;
}

.field {
  display: grid;
  gap: 5px;
  margin-bottom: 8px;
}

input {
  width: 100%;
  min-height: 32px;
  border: 1px solid var(--line);
  background: white;
  color: var(--ink);
  padding: 5px 8px;
}

.new-category {
  display: grid;
  grid-template-columns: 1fr 68px;
  gap: 6px;
  margin-bottom: 10px;
}

.category-nav {
  display: grid;
  gap: 2px;
  margin-bottom: 10px;
}

.nav-item {
  position: relative;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 6px;
  align-items: center;
  min-height: 28px;
  padding: 4px 7px;
  border: 1px solid transparent;
  background: transparent;
  text-align: left;
}

.nav-item[draggable="true"] {
  cursor: grab;
}

.nav-item[draggable="true"]:active {
  cursor: grabbing;
}

.nav-item.is-active {
  border-color: var(--ink);
  background: var(--panel-2);
}

.nav-item.is-dragging {
  opacity: 0.52;
}

.nav-item.is-drop-target {
  border-color: var(--accent);
  background: rgba(15, 118, 110, 0.12);
  color: var(--accent);
}

.nav-item.is-drop-before::before,
.nav-item.is-drop-after::after {
  content: "";
  position: absolute;
  left: 6px;
  right: 6px;
  height: 2px;
  border-radius: 2px;
  background: var(--accent-2);
  box-shadow: 0 0 0 2px rgba(184, 74, 43, 0.12);
}

.nav-item.is-drop-before::before {
  top: -2px;
}

.nav-item.is-drop-after::after {
  bottom: -2px;
}

.nav-count {
  min-width: 28px;
  text-align: right;
  color: var(--muted);
}

.rail-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6px;
  padding-top: 10px;
  border-top: 1px solid var(--line);
}

.import-btn {
  display: grid;
  place-items: center;
  min-height: 36px;
  border: 1px solid var(--line);
  background: var(--panel);
  cursor: pointer;
}

.import-btn input {
  position: absolute;
  inline-size: 1px;
  block-size: 1px;
  opacity: 0;
}

.workspace {
  min-width: 0;
  padding: 12px;
}

.toolbar {
  position: sticky;
  top: 0;
  z-index: 4;
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: center;
  padding: 4px 0 10px;
  background: linear-gradient(rgba(245, 242, 234, 0.98), rgba(245, 242, 234, 0.82));
  backdrop-filter: blur(10px);
}

.stats {
  display: flex;
  gap: 6px;
}

.stats div {
  min-width: 58px;
  border: 1px solid var(--line);
  background: rgba(255, 253, 248, 0.78);
  padding: 6px 8px;
  text-align: right;
}

.stats strong {
  display: block;
  font-size: 17px;
  line-height: 1;
}

.board {
  column-width: 248px;
  column-gap: 10px;
}

.category-panel {
  display: inline-block;
  width: 100%;
  margin: 0 0 12px;
  min-height: 96px;
  border: 2px solid #c9c2b5;
  background: rgba(255, 253, 248, 0.94);
  box-shadow: 0 10px 24px rgba(38, 35, 28, 0.12);
  break-inside: avoid;
  page-break-inside: avoid;
}

.category-panel.is-drop-target {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(15, 118, 110, 0.18), var(--shadow);
}

.category-panel.is-drop-before,
.category-panel.is-drop-after {
  border-color: var(--accent-2);
}

.category-panel.is-drop-before {
  box-shadow: inset 0 4px 0 var(--accent-2), 0 10px 24px rgba(38, 35, 28, 0.12);
}

.category-panel.is-drop-after {
  box-shadow: inset 0 -4px 0 var(--accent-2), 0 10px 24px rgba(38, 35, 28, 0.12);
}

.category-header {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  align-items: center;
  min-height: 34px;
  padding: 7px 10px 6px;
  border-bottom: 2px solid #c9c2b5;
  border-left: 5px solid var(--accent);
  background:
    linear-gradient(90deg, rgba(15, 118, 110, 0.18), rgba(184, 74, 43, 0.11)),
    #ebe4d8;
  cursor: grab;
}

.category-header:active {
  cursor: grabbing;
}

.category-header.is-dragging {
  opacity: 0.58;
}

.category-title {
  font-size: 15px;
  font-weight: 800;
}

.category-count {
  color: #4e5761;
  font-size: 12px;
  font-weight: 700;
}

.rating-sort-btn {
  display: inline-grid;
  place-items: center;
  min-height: 22px;
  padding: 0 6px;
  border-color: rgba(31, 35, 40, 0.16);
  background: rgba(255, 253, 248, 0.72);
  color: #5f6871;
  font-size: 11px;
  font-weight: 800;
  line-height: 1;
  white-space: nowrap;
  cursor: pointer;
}

.rating-sort-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.rating-sort-btn.is-active {
  border-color: rgba(15, 118, 110, 0.42);
  background: var(--accent);
  color: white;
}

.book-list {
  display: grid;
  gap: 5px;
  min-height: 52px;
  padding: 6px;
}

.book-card {
  border: 1px solid #ded8cc;
  background: white;
  padding: 6px 7px;
  cursor: grab;
  transition: transform 140ms ease, border-color 140ms ease, box-shadow 140ms ease;
}

.book-card:hover {
  border-color: var(--accent);
  box-shadow: 0 5px 14px rgba(38, 35, 28, 0.1);
  transform: translateY(-1px);
}

.book-card:active {
  cursor: grabbing;
}

.book-card.is-dragging {
  opacity: 0.45;
}

.book-card.is-drop-before {
  border-top-color: var(--accent-2);
  box-shadow: inset 0 2px 0 var(--accent-2);
}

.book-main {
  display: grid;
  grid-template-columns: minmax(0, auto) max-content 1fr max-content;
  gap: 4px;
  align-items: baseline;
  line-height: 1.15;
}

.book-title {
  min-width: 0;
  color: var(--ink);
  font-size: 15px;
  font-weight: 700;
  line-height: 1.15;
  text-decoration: none;
  overflow-wrap: anywhere;
}

.book-title:hover {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.inline-chip {
  display: inline-block;
  margin-left: 0;
  vertical-align: baseline;
  color: var(--muted);
  font-size: 9px;
  font-weight: 500;
}

.rating-pill {
  grid-column: 4;
  justify-self: end;
  min-width: 26px;
  border: 1px solid rgba(15, 118, 110, 0.35);
  background: rgba(15, 118, 110, 0.1);
  color: var(--accent);
  padding: 0 4px;
  font-size: 9px;
  font-weight: 800;
  line-height: 1.35;
  text-align: center;
  white-space: nowrap;
}

.card-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  margin-top: 4px;
}

.chip,
.inline-chip {
  border: 1px solid var(--line);
  background: #faf8f1;
  padding: 0 4px;
  line-height: 1.35;
}

.changed-mark {
  border-color: var(--accent-2);
  color: var(--accent-2);
}

.empty {
  display: grid;
  place-items: center;
  min-height: 42px;
  color: var(--muted);
  border: 1px dashed var(--line);
  background: rgba(236, 231, 220, 0.45);
  font-size: 12px;
}

@media (max-width: 860px) {
  .app-shell {
    grid-template-columns: 1fr;
  }

  .rail {
    position: static;
    height: auto;
  }

  .toolbar {
    position: static;
    align-items: flex-start;
    flex-direction: column;
  }

  .toolbar-title {
    width: 100%;
    justify-content: flex-start;
  }

  .toolbar-right {
    width: 100%;
    justify-content: space-between;
  }

  .stats {
    flex: 1;
  }

  .stats div {
    flex: 1;
  }

  .board {
    column-width: auto;
    column-count: 1;
  }
}