/* ===================================================================
   PDF ⇄ 图片 转换工具箱 - 统一视觉风格
   基础风格来自 png-to-pdf，扩展 Tab、PDF 预览等组件
   =================================================================== */
:root {
  --bg: #f6f7fb;
  --card: #fff;
  --primary: #4f6bed;
  --muted: #6b7280;
  --border: #e5e7eb;
  --text: #111827;
  --shadow: 0 6px 20px rgba(0, 0, 0, .05);
}
html[data-theme="neutral"] {
  --bg: #f5f5f0;
  --card: #fff;
  --muted: #555;
  --border: #ddd;
  --text: #222;
  --shadow: 0 6px 20px rgba(0, 0, 0, .08);
}
html[data-theme="high-contrast"] {
  --bg: #0a0a0a;
  --card: #111;
  --muted: #ddd;
  --border: #333;
  --text: #f5f5f5;
  --shadow: 0 6px 20px rgba(0, 0, 0, .6);
}
html, body {
  margin: 0;
  padding: 0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, Arial;
  background: linear-gradient(135deg, #f1f5ff 0%, #e9f0ff 60%, #f3f6ff 100%);
  min-height: 100vh;
  color: var(--text);
}
[hidden] { display: none !important; }
html[data-theme="neutral"], html[data-theme="neutral"] body {
  background: linear-gradient(135deg, #f5f5f0 0%, #efefe8 60%, #f5f5f0 100%);
}
html[data-theme="high-contrast"], html[data-theme="high-contrast"] body {
  background: linear-gradient(135deg, #0a0a0a 0%, #14141f 60%, #0a0a0a 100%);
}
.wrap { max-width: 880px; margin: 40px auto; padding: 20px; }
.panel {
  background: var(--card);
  border-radius: 12px;
  padding: 24px;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
}
h1 { margin: 0 0 16px; font-size: 22px; color: var(--text); }

/* ========== 顶部工具栏与主题 ========== */
.toolbar {
  display: flex;
  gap: 8px;
  align-items: center;
  padding: 8px 0;
  border-bottom: 1px solid var(--border);
  margin-bottom: 16px;
  flex-wrap: wrap;
}
.toolbar-label { font-size: 12px; color: var(--muted); margin-right: 4px; }
.theme-btn {
  padding: 6px 12px;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--text);
  cursor: pointer;
  font-size: 12px;
  transition: all .2s;
}
.theme-btn:hover { border-color: var(--primary); }
.theme-btn.active { background: var(--primary); color: #fff; border-color: var(--primary); }

/* ========== Tab 切换 ========== */
.tabs { display: flex; gap: 6px; border-bottom: 2px solid var(--border); margin-bottom: 18px; }
.tab-btn {
  padding: 10px 22px;
  border: none;
  background: transparent;
  color: var(--muted);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  border-radius: 8px 8px 0 0;
  border-bottom: 2px solid transparent;
  margin-bottom: -2px;
  transition: all .2s;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.tab-btn:hover:not(.active) { color: var(--primary); background: rgba(79, 107, 237, .06); transform: none; }
.tab-btn.active { color: var(--primary); border-bottom-color: var(--primary); background: rgba(79, 107, 237, .08); }
.tab-panel { display: none; }
.tab-panel.active { display: block; }

/* ========== 拖拽上传区 ========== */
.dropzone {
  border: 2px dashed #cbd5e1;
  border-radius: 12px;
  padding: 32px;
  text-align: center;
  color: var(--muted);
  cursor: pointer;
  transition: all .2s;
  user-select: none;
  background: rgba(79, 107, 237, 0.02);
}
.dropzone:hover, .dropzone.dragover {
  border-color: var(--primary);
  color: var(--primary);
  background: rgba(79, 107, 237, 0.05);
}
.dropzone.dragover { transform: scale(1.01); }
.dropzone-icon { font-size: 32px; margin-bottom: 8px; }
.dropzone-hint { font-size: 12px; color: #9ca3af; margin-top: 6px; }
html[data-theme="high-contrast"] .dropzone { border-color: #444; }

/* ========== 缩略图网格（图片转 PDF） ========== */
#thumbs {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(170px, 1fr));
  gap: 12px;
  margin-top: 16px;
}
.thumb {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px;
  display: flex;
  flex-direction: column;
  transition: all .2s;
  cursor: grab;
}
.thumb:hover {
  border-color: var(--primary);
  box-shadow: 0 4px 12px rgba(79, 107, 237, 0.15);
  transform: translateY(-2px);
}
.thumb.dragging { opacity: 0.5; }
.thumb.drag-over { border-color: var(--primary); background: rgba(79, 107, 237, 0.08); }

.thumb-header { display: flex; align-items: center; gap: 6px; margin-bottom: 8px; }
.drag-handle { cursor: grab; padding: 2px 4px; color: #bbb; font-size: 14px; user-select: none; }
.thumb:hover .drag-handle { color: #888; }
.selectBox { width: 16px; height: 16px; cursor: pointer; accent-color: var(--primary); }

.thumb img {
  width: 100%;
  height: 110px;
  object-fit: cover;
  border-radius: 6px;
  cursor: pointer;
  background: #f3f4f6;
  transition: transform .2s;
}
.thumb img:hover { transform: scale(1.02); }

.thumb-meta { display: flex; justify-content: space-between; align-items: center; font-size: 11px; color: var(--muted); margin-top: 8px; }
.thumb-name { font-weight: 500; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; flex: 1; }

.thumb-actions {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 4px;
  margin-top: 10px;
  padding-top: 8px;
  border-top: 1px solid #f3f4f6;
}
.btn-icon {
  padding: 4px 8px;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: #f9fafb;
  font-size: 11px;
  cursor: pointer;
  transition: all .2s;
}
.btn-icon:hover { background: var(--primary); color: #fff; border-color: var(--primary); }
.btn-icon.delete:hover, .btn-icon.delete-btn:hover { background: #ef4444; border-color: #ef4444; }

/* ========== 操作行与表单控件 ========== */
.action-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  margin-top: 16px;
  flex-wrap: wrap;
}
.action-left, .action-right { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }
.select-wrapper { display: flex; align-items: center; gap: 6px; }
.select-wrapper label { font-size: 13px; color: var(--muted); }
select {
  padding: 8px 12px;
  border-radius: 6px;
  border: 1px solid var(--border);
  font-size: 13px;
  cursor: pointer;
  background: var(--card);
  color: var(--text);
}
.num-input {
  width: 72px;
  padding: 8px 10px;
  border-radius: 6px;
  border: 1px solid var(--border);
  font-size: 13px;
  background: var(--card);
  color: var(--text);
}
.text-input {
  width: 150px;
  padding: 8px 10px;
  border-radius: 6px;
  border: 1px solid var(--border);
  font-size: 13px;
  background: var(--card);
  color: var(--text);
}

button {
  background: var(--primary);
  color: white;
  border: none;
  border-radius: 8px;
  padding: 10px 18px;
  font-size: 14px;
  cursor: pointer;
  transition: all .2s;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-weight: 500;
}
button:hover:not(:disabled) { background: #3d5bd9; transform: translateY(-1px); }
button:disabled { opacity: 0.5; cursor: not-allowed; }
.btn-secondary { background: #f3f4f6; color: #374151; }
.btn-secondary:hover:not(:disabled) { background: #e5e7eb; }
html[data-theme="high-contrast"] .btn-secondary { background: #2a2a2a; color: #eee; }
html[data-theme="high-contrast"] .btn-secondary:hover:not(:disabled) { background: #3a3a3a; }
.btn-danger { background: #fef2f2; color: #dc2626; border: 1px solid #fecaca; }
.btn-danger:hover:not(:disabled) { background: #fee2e2; }
html[data-theme="high-contrast"] .btn-danger { background: #2a1214; color: #f87171; border-color: #5b2020; }
html[data-theme="high-contrast"] .btn-danger:hover:not(:disabled) { background: #3a181a; }

input[type="file"] { display: none; }
.file-label {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 16px;
  background: #f3f4f6;
  border-radius: 8px;
  cursor: pointer;
  font-size: 13px;
  transition: all .2s;
}
.file-label:hover { background: #e5e7eb; }
html[data-theme="high-contrast"] .file-label { background: #2a2a2a; color: #eee; }
html[data-theme="high-contrast"] .file-label:hover { background: #3a3a3a; }

/* ========== 进度条与日志 ========== */
.progress-bar {
  width: 100%;
  height: 4px;
  background: var(--border);
  border-radius: 2px;
  overflow: hidden;
  margin-top: 12px;
  display: none;
}
.progress-bar.show { display: block; }
.progress-fill { height: 100%; background: var(--primary); border-radius: 2px; transition: width 0.3s ease; }

.log {
  margin-top: 12px;
  padding: 10px 14px;
  background: #f9fafb;
  border-radius: 6px;
  color: var(--muted);
  font-size: 13px;
}
.log.success { background: #f0fdf4; color: #166534; }
.log.error { background: #fef2f2; color: #dc2626; }
html[data-theme="high-contrast"] .log { background: #1a1a1a; }
html[data-theme="high-contrast"] .log.success { background: #0f2417; color: #4ade80; }
html[data-theme="high-contrast"] .log.error { background: #2a1214; color: #f87171; }

/* ========== PDF 转图片：信息区与页面预览 ========== */
.pdf-meta {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
  margin-top: 14px;
  font-size: 13px;
  color: var(--muted);
}
.pdf-meta b { color: var(--text); font-weight: 600; margin-left: 2px; }

.pdf-preview { margin-top: 16px; }
.pdf-preview canvas {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  margin: 0 auto 16px;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 8px;
  box-shadow: 0 2px 10px rgba(0, 0, 0, .07);
}

/* ========== 预览模态框 ========== */
.modal { position: fixed; top: 0; left: 0; width: 100%; height: 100%; display: none; align-items: center; justify-content: center; background: rgba(0,0,0,.6); z-index: 9999; backdrop-filter: blur(4px); }
.modal.show { display: flex; }
.modal-content { background: var(--card); border-radius: 12px; overflow: hidden; max-width: 90vw; max-height: 90vh; box-shadow: 0 20px 40px rgba(0,0,0,.3); position: relative; }
.modal-close { position: absolute; top: 12px; right: 12px; border: none; background: rgba(0,0,0,0.5); color: #fff; width: 32px; height: 32px; border-radius: 50%; font-size: 18px; cursor: pointer; display: flex; align-items: center; justify-content: center; z-index: 10; padding: 0; }
.modal-close:hover { background: rgba(0,0,0,0.7); transform: none; }
.modal-toolbar { display: flex; gap: 8px; align-items: center; padding: 10px 14px; background: #f9fafb; border-bottom: 1px solid var(--border); }
.modal-toolbar span { font-size: 13px; color: var(--muted); min-width: 50px; text-align: center; }
html[data-theme="high-contrast"] .modal-toolbar { background: #1a1a1a; }
.image-wrap { overflow: auto; max-height: calc(90vh - 60px); display: flex; justify-content: center; align-items: center; background: #1a1a1a; }
.image-wrap img { max-width: 100%; max-height: 80vh; object-fit: contain; }

.empty-state { text-align: center; padding: 40px 20px; color: var(--muted); }
.empty-state svg { width: 48px; height: 48px; opacity: 0.4; margin-bottom: 12px; }

@media (max-width: 640px) {
  .wrap { margin: 20px auto; padding: 12px; }
  .panel { padding: 16px; }
  #thumbs { grid-template-columns: repeat(auto-fill, minmax(140px, 1fr)); }
}