:root {
  --bk-bg: #f4f5f8;
  --bk-surface: #ffffff;
  --bk-surface-2: #f6f7f9;
  --bk-text: #1b1f27;
  --bk-muted: #666f7d;
  --bk-faint: #98a1af;
  --bk-line: #e4e7ec;
  --bk-hover: #f1f3f7;
  --bk-accent: #7b68ee;
  --bk-accent-soft: #efedff;
  --bk-danger: #d64545;
  --bk-shadow: 0 12px 32px rgba(24, 31, 45, 0.16);
  color-scheme: light;
}

:root[data-theme="dark"] {
  --bk-bg: #131316;
  --bk-surface: #1e1e22;
  --bk-surface-2: #26262b;
  --bk-text: #f2f3f5;
  --bk-muted: #a1a1aa;
  --bk-faint: #77777f;
  --bk-line: #33333a;
  --bk-hover: #2a2a30;
  --bk-accent: #a78bfa;
  --bk-accent-soft: #302a4a;
  --bk-danger: #f87171;
  --bk-shadow: 0 14px 36px rgba(0, 0, 0, 0.5);
  color-scheme: dark;
}

* {
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bk-bg);
  color: var(--bk-text);
  font-family: "vivo Sans SC", "Microsoft YaHei", "PingFang SC", "Segoe UI", system-ui, sans-serif;
  font-size: 14px;
  line-height: 1.55;
}

.bk-top {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid var(--bk-line);
  background: var(--bk-surface);
}

.bk-top-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  max-width: 1180px;
  margin: 0 auto;
  padding: 10px 16px;
}

.bk-brand {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 10px 6px 8px;
  border-radius: 8px;
  color: var(--bk-text);
  text-decoration: none;
}

.bk-brand:hover {
  background: var(--bk-hover);
}

.bk-brand svg {
  width: 17px;
  height: 17px;
}

.bk-brand strong {
  font-size: 16px;
  font-weight: 650;
  white-space: nowrap;
}

.bk-search {
  position: relative;
  display: flex;
  align-items: center;
  flex: 1 1 220px;
  max-width: 420px;
}

.bk-search > svg {
  position: absolute;
  left: 10px;
  width: 16px;
  height: 16px;
  color: var(--bk-faint);
  pointer-events: none;
}

.bk-search input {
  width: 100%;
  height: 36px;
  padding: 0 12px 0 32px;
  border: 1px solid var(--bk-line);
  border-radius: 8px;
  background: var(--bk-surface-2);
  color: var(--bk-text);
  font: inherit;
  font-size: 13px;
  outline: none;
}

.bk-search input:focus {
  border-color: var(--bk-accent);
  background: var(--bk-surface);
}

.bk-count {
  margin-left: auto;
  color: var(--bk-muted);
  font-size: 12.5px;
  white-space: nowrap;
}

.bk-main {
  max-width: 1180px;
  margin: 0 auto;
  padding: 16px 16px 60px;
}

.bk-toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  margin-bottom: 14px;
}

.bk-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.bk-chip {
  padding: 5px 12px;
  border: 1px solid var(--bk-line);
  border-radius: 999px;
  background: var(--bk-surface);
  color: var(--bk-muted);
  font: inherit;
  font-size: 12.5px;
  cursor: pointer;
}

.bk-chip.is-on {
  border-color: var(--bk-accent);
  background: var(--bk-accent-soft);
  color: var(--bk-accent);
  font-weight: 600;
}

.bk-sort {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-left: auto;
  color: var(--bk-muted);
  font-size: 12.5px;
}

.bk-sort select {
  height: 32px;
  padding: 0 8px;
  border: 1px solid var(--bk-line);
  border-radius: 8px;
  background: var(--bk-surface);
  color: var(--bk-text);
  font: inherit;
  font-size: 12.5px;
}

.bk-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(168px, 1fr));
  gap: 18px;
}

.bk-card {
  display: flex;
  flex-direction: column;
  gap: 8px;
  cursor: pointer;
}

.bk-cover {
  position: relative;
  aspect-ratio: 2 / 3;
  overflow: hidden;
  border: 1px solid var(--bk-line);
  border-radius: 8px;
  background: linear-gradient(150deg, var(--bk-accent-soft), var(--bk-surface-2));
  box-shadow: 0 8px 20px rgba(24, 31, 45, 0.12);
  transition: transform 0.16s ease, box-shadow 0.16s ease;
}

.bk-card:hover .bk-cover {
  transform: translateY(-3px);
  box-shadow: 0 14px 28px rgba(24, 31, 45, 0.2);
}

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

.bk-cover-fallback {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px;
  color: color-mix(in srgb, var(--bk-accent) 80%, var(--bk-text));
  text-align: center;
}

.bk-cover-fallback svg {
  width: 30px;
  height: 30px;
  opacity: 0.75;
}

.bk-cover-fallback span {
  font-size: 12px;
  font-weight: 600;
  overflow: hidden;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
}

.bk-format {
  position: absolute;
  top: 8px;
  right: 8px;
  padding: 2px 8px;
  border-radius: 999px;
  background: rgba(16, 18, 24, 0.72);
  color: #fff;
  font-size: 10.5px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0;
}

.bk-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 4px;
  background: rgba(0, 0, 0, 0.18);
}

.bk-progress i {
  display: block;
  height: 100%;
  background: var(--bk-accent);
}

.bk-card-title {
  font-weight: 600;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.bk-card-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--bk-muted);
  font-size: 12px;
}

.bk-card-meta span {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.bk-card-edit {
  margin-left: auto;
  flex: 0 0 auto;
  width: 26px;
  height: 26px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 0;
  border-radius: 6px;
  background: transparent;
  color: var(--bk-faint);
  cursor: pointer;
}

.bk-card-edit:hover {
  background: var(--bk-hover);
  color: var(--bk-text);
}

.bk-card-edit:disabled,
.bk-card-edit.is-pending {
  cursor: default;
  opacity: 0.56;
}

.bk-card-edit svg {
  width: 15px;
  height: 15px;
}

.bk-empty {
  grid-column: 1 / -1;
  padding: 70px 20px;
  color: var(--bk-muted);
  text-align: center;
}

/* 弹窗 */
.bk-modal {
  position: fixed;
  inset: 0;
  z-index: 80;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 18px;
  background: rgba(12, 15, 21, 0.55);
}

.bk-dialog {
  width: min(560px, 100%);
  max-height: 88vh;
  overflow-y: auto;
  padding: 18px;
  border: 1px solid var(--bk-line);
  border-radius: 8px;
  background: var(--bk-surface);
  box-shadow: var(--bk-shadow);
}

.bk-dialog-head {
  position: sticky;
  top: -18px;
  z-index: 4;
  display: flex;
  align-items: center;
  gap: 10px;
  margin: -18px -18px 14px;
  padding: 16px 18px 12px;
  border-bottom: 1px solid var(--bk-line);
  background: var(--bk-surface);
}

.bk-dialog-head h2 {
  margin: 0;
  font-size: 17px;
}

.bk-dialog-head .bk-icon-btn {
  margin-left: auto;
}

.bk-file-field {
  display: block;
  margin-bottom: 14px;
  cursor: pointer;
}

.bk-file-field input {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
  pointer-events: none;
}

.bk-file-field > span {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 88px;
  padding: 16px;
  border: 1px dashed var(--bk-line);
  border-radius: 8px;
  background: var(--bk-surface-2);
  color: var(--bk-muted);
}

.bk-file-field > span strong {
  color: var(--bk-text);
}

.bk-file-field:hover > span {
  border-color: var(--bk-accent);
}

.bk-file-field small {
  display: block;
  margin-top: 6px;
  color: var(--bk-faint);
  font-size: 11.5px;
}

.bk-field {
  display: flex;
  flex-direction: column;
  gap: 5px;
  min-width: 0;
  margin-bottom: 12px;
}

.bk-field span {
  color: var(--bk-muted);
  font-size: 12px;
  font-weight: 600;
}

.bk-field input,
.bk-field textarea {
  padding: 8px 10px;
  border: 1px solid var(--bk-line);
  border-radius: 8px;
  background: var(--bk-surface-2);
  color: var(--bk-text);
  font: inherit;
  font-size: 13px;
  outline: none;
}

.bk-field input {
  height: 36px;
}

.bk-field input:focus,
.bk-field textarea:focus {
  border-color: var(--bk-accent);
}

.bk-field-row {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.bk-hint {
  margin: 4px 0 12px;
  color: var(--bk-muted);
  font-size: 12px;
}

.bk-form-error {
  margin: 0 0 10px;
  padding: 8px 10px;
  border-radius: 8px;
  background: color-mix(in srgb, var(--bk-danger) 12%, transparent);
  color: var(--bk-danger);
  font-size: 12.5px;
}

.bk-dialog-actions {
  position: sticky;
  bottom: -18px;
  z-index: 4;
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 14px -18px -18px;
  padding: 12px 18px;
  border-top: 1px solid var(--bk-line);
  background: var(--bk-surface);
}

.bk-spacer {
  flex: 1;
}

.bk-icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border: 1px solid transparent;
  border-radius: 8px;
  background: transparent;
  color: var(--bk-muted);
  cursor: pointer;
}

.bk-icon-btn:hover {
  background: var(--bk-hover);
  color: var(--bk-text);
}

.bk-icon-btn svg {
  width: 17px;
  height: 17px;
}

.bk-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  min-height: 36px;
  padding: 0 13px;
  border: 1px solid var(--bk-line);
  border-radius: 8px;
  background: var(--bk-surface);
  color: var(--bk-text);
  font: inherit;
  font-size: 13px;
  font-weight: 600;
  white-space: nowrap;
  cursor: pointer;
}

.bk-btn:hover {
  background: var(--bk-hover);
}

.bk-btn svg {
  width: 15px;
  height: 15px;
}

.bk-btn-primary {
  border-color: var(--bk-accent);
  background: var(--bk-accent);
  color: #fff;
}

.bk-btn-primary:hover {
  background: color-mix(in srgb, var(--bk-accent) 88%, #000);
  color: #fff;
}

.bk-btn-danger {
  border-color: color-mix(in srgb, var(--bk-danger) 40%, var(--bk-line));
  background: transparent;
  color: var(--bk-danger);
}

.bk-toast {
  position: fixed;
  left: 50%;
  bottom: 28px;
  z-index: 120;
  max-width: min(480px, calc(100vw - 32px));
  padding: 10px 16px;
  border-radius: 8px;
  background: #252a34;
  color: #fff;
  font-size: 13px;
  box-shadow: var(--bk-shadow);
  transform: translateX(-50%);
}

.bk-dialog .pg-rows {
  --pg-accent: var(--bk-accent);
  margin: 4px 0 8px;
}

@media (max-width: 640px) {
  .bk-grid {
    grid-template-columns: repeat(auto-fill, minmax(132px, 1fr));
    gap: 14px;
  }

  .bk-top-inner {
    padding: 8px 12px 10px;
  }

  .bk-search {
    order: 9;
    flex-basis: 100%;
    max-width: none;
  }

  .bk-main {
    padding: 12px 12px 48px;
  }

  .bk-sort {
    margin-left: 0;
  }

  .bk-field-row {
    grid-template-columns: 1fr;
  }
}