/* 呈现壳预览页 — 主工作面 = 壳画布；侧栏只负责换壳 */

html,
body.shells-page {
  height: auto;
  min-height: 100%;
  overflow: auto;
  background: var(--st-bg, #f4f4f5);
}

.shells-page .st-shell.shells-shell {
  max-width: 1280px;
  align-items: start;
  grid-template-columns: 200px minmax(0, 1fr);
}

.shells-page .st-rail {
  width: 200px;
  position: sticky;
  top: var(--st-top-h, 48px);
  max-height: calc(100dvh - var(--st-top-h, 48px));
  overflow-y: auto;
  min-height: 0;
  align-self: start;
  gap: 2px;
}

.st-rail-hint {
  margin: 0 8px 10px;
  font-size: 11px;
  line-height: 1.45;
  color: var(--st-faint, #a1a1aa);
}

.shells-list {
  display: flex;
  flex-direction: column;
  gap: 2px;
  flex: 0 0 auto;
}

.shells-list .st-rail-item {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 2px;
  padding: 8px 10px;
  line-height: 1.25;
}

.shells-list .shell-item-name {
  font-size: 13px;
  font-weight: 600;
  color: inherit;
}

.shells-list .shell-item-task {
  font-size: 11px;
  font-weight: 400;
  color: var(--st-faint, #a1a1aa);
}

.shells-list .st-rail-item.active .shell-item-task {
  color: color-mix(in srgb, var(--st-accent, #2563eb) 65%, #71717a);
}

.shells-main {
  min-height: calc(100dvh - var(--st-top-h, 48px));
  display: flex;
  flex-direction: column;
}

.shells-toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  gap: 12px 20px;
  padding: 14px 24px 12px;
  border-bottom: 1px solid var(--st-border, #e4e4e7);
  background: var(--st-surface, #fff);
  position: sticky;
  top: var(--st-top-h, 48px);
  z-index: 3;
}

.shells-toolbar-block {
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 0;
}

.shells-toolbar-label {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--st-faint, #a1a1aa);
}

.shells-toolbar-meta {
  margin-left: auto;
  align-items: flex-end;
  text-align: right;
  max-width: 280px;
}

.shells-toolbar-meta .shells-meta-title {
  margin: 0;
  font-size: 14px;
  font-weight: 650;
  color: var(--st-text, #18181b);
}

.shells-toolbar-meta .shells-meta-sub {
  margin: 2px 0 0;
  font-size: 12px;
  color: var(--st-muted, #71717a);
  line-height: 1.4;
}

.shells-tones {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.shells-tone-chip {
  font: inherit;
  font-size: 12px;
  padding: 5px 10px;
  border-radius: 6px;
  border: 1px solid var(--st-border, #e4e4e7);
  background: var(--st-surface, #fff);
  cursor: pointer;
  color: var(--st-muted, #71717a);
}

.shells-tone-chip:hover {
  background: #f4f4f5;
  color: var(--st-text, #18181b);
}

.shells-tone-chip:focus-visible {
  outline: 2px solid var(--st-accent, #2563eb);
  outline-offset: 2px;
}

.shells-tone-chip.active {
  border-color: transparent;
  background: var(--st-accent-soft, #dbeafe);
  color: var(--st-accent, #2563eb);
  font-weight: 600;
}

/* 主工作面：尽量大的阅读画布 */
.shells-preview-wrap {
  flex: 1 1 auto;
  padding: 20px 24px 28px;
  background: #ebebed;
}

.shells-preview {
  min-height: min(70vh, 720px);
  padding: 20px 16px 28px;
  border-radius: 10px;
  border: 1px solid var(--st-border, #e4e4e7);
  background: #f4f4f5;
  overflow: visible;
}

.shells-preview .present-shell {
  max-width: 42rem;
  margin: 0 auto;
  box-shadow: none;
}

.shells-preview[data-shell="turn_panel"] .present-shell,
.shells-preview[data-shell="split_board"] .present-shell,
.shells-preview[data-shell="chapter_reader"] .present-shell {
  max-width: 52rem;
}

.shells-preview .present-shell-badge {
  display: none;
}

.shells-details {
  margin: 0 24px 28px;
  border: 1px solid var(--st-border, #e4e4e7);
  border-radius: 8px;
  background: var(--st-surface, #fff);
}

.shells-details > summary {
  cursor: pointer;
  padding: 12px 14px;
  font-size: 13px;
  font-weight: 600;
  color: var(--st-muted, #71717a);
  list-style: none;
}

.shells-details > summary::-webkit-details-marker {
  display: none;
}

.shells-details > summary::before {
  content: "▸ ";
  color: var(--st-faint, #a1a1aa);
}

.shells-details[open] > summary::before {
  content: "▾ ";
}

.shells-details[open] > summary {
  border-bottom: 1px solid var(--st-border, #e4e4e7);
  color: var(--st-text, #18181b);
}

.shells-details-body {
  padding: 14px 16px 16px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.shells-tweak-grid {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.shells-tweak-grid .field {
  display: flex;
  flex-direction: column;
  gap: 4px;
  font-size: 13px;
}

.shells-tweak-grid input[type="text"] {
  font: inherit;
  padding: 6px 8px;
  border-radius: 6px;
  border: 1px solid var(--st-border, #e4e4e7);
  max-width: 320px;
}

.shells-help-list {
  margin: 0;
  padding-left: 1.15rem;
  line-height: 1.55;
  font-size: 13px;
  color: var(--st-muted, #71717a);
}

@media (max-width: 800px) {
  .shells-page .st-shell.shells-shell {
    grid-template-columns: 1fr;
  }

  .shells-page .st-rail {
    position: static;
    max-height: none;
    width: auto;
    overflow: visible;
    border-right: none;
    border-bottom: 1px solid var(--st-border, #e4e4e7);
  }

  .shells-list {
    flex-direction: row;
    flex-wrap: wrap;
  }

  .shells-list .st-rail-item {
    width: auto;
    max-width: 46%;
  }

  .st-rail-hint,
  .st-rail-note {
    display: none;
  }

  .shells-toolbar {
    position: static;
  }

  .shells-toolbar-meta {
    margin-left: 0;
    text-align: left;
    align-items: flex-start;
    max-width: none;
    width: 100%;
  }

  .shells-preview-wrap {
    padding: 12px;
  }

  .shells-preview .present-shell {
    max-width: 100%;
  }

  .shells-details {
    margin: 0 12px 20px;
  }
}