/* 呈现壳预览页
 * 注意：本页也引入 styles.css（present 样式），会给 body 设 overflow:hidden；
 * 必须在此覆盖，否则侧栏后几项点不到。
 */
html,
body.shells-page {
  height: auto;
  min-height: 100%;
  overflow: auto;
}

.shells-page .st-shell.shells-shell {
  max-width: 1180px;
  align-items: start;
}

.shells-page .st-rail {
  --st-rail-w: 220px;
  width: var(--st-rail-w);
  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;
}

.shells-tone-label {
  margin-top: 1rem !important;
}

.shells-density {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 10px;
  align-items: baseline;
  margin: 0.5rem 0 0.35rem;
  padding: 8px 10px;
  border-radius: 8px;
  background: color-mix(in srgb, var(--accent-soft, #e8f0fe) 70%, transparent);
  font-size: 13px;
  line-height: 1.45;
}

.shells-density span {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--muted, #666);
  text-transform: uppercase;
}

.shells-list {
  display: flex;
  flex-direction: column;
  gap: 4px;
  flex: 0 0 auto;
}

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

.shells-tone-chip {
  font: inherit;
  font-size: 12px;
  padding: 4px 10px;
  border-radius: 999px;
  border: 1px solid var(--border, #ddd);
  background: var(--surface, #fff);
  cursor: pointer;
  color: inherit;
}

.shells-tone-chip.active {
  border-color: transparent;
  background: var(--accent-soft, #e8f0fe);
  font-weight: 600;
}

.shells-body {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.shells-meta p {
  margin: 0 0 0.35rem;
  line-height: 1.5;
}

.shells-preview-label,
.shells-tweaks h2,
.shells-help h2 {
  margin: 0 0 0.5rem;
  font-size: 13px;
  font-weight: 700;
  color: var(--muted, #666);
}

.shells-preview {
  min-height: 280px;
  padding: 16px;
  border-radius: 12px;
  border: 1px dashed var(--border, #ccc);
  background:
    radial-gradient(ellipse at 20% 0%, rgba(15, 118, 110, 0.06), transparent 50%),
    var(--bg, #f6f6f4);
}

.shells-preview .present-shell {
  max-width: 640px;
  margin: 0 auto;
  box-shadow: 0 10px 28px rgba(28, 25, 23, 0.07);
}

.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: 780px;
}

/* 预览区不裁切长正文 */
.shells-preview {
  overflow: visible;
}

.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(--border, #ddd);
}

.shells-help ul {
  margin: 0;
  padding-left: 1.2rem;
  line-height: 1.55;
  font-size: 13px;
}

.shells-help .muted {
  font-size: 12px;
  color: var(--muted, #888);
}

@media (max-width: 800px) {
  .shells-page .st-rail {
    position: static;
    max-height: none;
    width: auto;
    overflow: visible;
  }

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