:root {
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --bg: #f3f5f9;
  --card: #ffffff;
  --border: #e2e6ee;
  --text: #1f2937;
  --text-muted: #6b7280;
  --danger: #dc2626;
  --radius: 12px;
  --shadow: 0 1px 3px rgba(16, 24, 40, .08), 0 1px 2px rgba(16, 24, 40, .04);
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ---------- 头部 ---------- */
.header {
  background: linear-gradient(135deg, #2563eb 0%, #4f46e5 60%, #7c3aed 100%);
  color: #fff;
  padding: 26px 20px 66px;
}
.header-inner {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 16px;
}
.logo {
  background: rgba(255, 255, 255, .16);
  border-radius: 14px;
  padding: 10px;
  display: flex;
}
.header h1 { font-size: 26px; font-weight: 700; letter-spacing: 1px; }
.header .sub { font-size: 13px; opacity: .85; margin-top: 4px; }

/* ---------- 标签页 ---------- */
.tabs {
  max-width: 860px;
  margin: -36px auto 0;
  padding: 0 20px;
  display: flex;
  gap: 10px;
}
.tab {
  border: none;
  background: var(--card);
  color: var(--text-muted);
  font-size: 15px;
  font-weight: 600;
  padding: 13px 26px;
  border-radius: 12px 12px 0 0;
  cursor: pointer;
  box-shadow: var(--shadow);
  transition: color .15s;
}
.tab:hover { color: var(--primary); }
.tab.active {
  color: var(--primary);
  background: var(--bg);
  box-shadow: none;
}

/* ---------- 主容器 ---------- */
.container {
  max-width: 860px;
  width: 100%;
  margin: 0 auto;
  padding: 0 20px 40px;
  flex: 1;
}
.panel { display: none; }
.panel.active { display: block; }

/* ---------- 拖放区 ---------- */
.drop-zone {
  background: var(--card);
  border: 2px dashed #c3cbdb;
  border-radius: var(--radius);
  padding: 42px 20px;
  text-align: center;
  color: var(--text-muted);
  cursor: pointer;
  transition: border-color .15s, background .15s;
}
.drop-zone:hover, .drop-zone.over {
  border-color: var(--primary);
  background: #f0f6ff;
}
.drop-zone.over svg { transform: translateY(-2px); }
.drop-zone svg { color: #9aa7bd; transition: transform .15s; }
.dz-title { margin-top: 14px; font-size: 16px; color: var(--text); }
.dz-hint { margin-top: 6px; font-size: 13px; }
.link { color: var(--primary); font-weight: 600; }

/* ---------- 文件列表 ---------- */
.file-list {
  list-style: none;
  margin-top: 16px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.file-item {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 12px 14px;
  display: flex;
  gap: 14px;
  align-items: center;
}
.file-item.dragging { opacity: .4; }
.file-item.drop-before { box-shadow: 0 -2px 0 0 var(--primary); }
.file-item.drop-after { box-shadow: 0 2px 0 0 var(--primary); }

.thumb {
  width: 52px;
  height: 68px;
  object-fit: contain;
  background: #f8fafc;
  border: 1px solid var(--border);
  border-radius: 6px;
  flex-shrink: 0;
}
.thumb.placeholder {
  display: flex;
  align-items: center;
  justify-content: center;
  color: #aab4c6;
  font-size: 20px;
  font-weight: 700;
}

.file-info { flex: 1; min-width: 0; }
.file-name {
  font-size: 14px;
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.file-meta { font-size: 12px; color: var(--text-muted); margin-top: 3px; }
.file-error { font-size: 12px; color: var(--danger); margin-top: 3px; }

.page-sel {
  margin-top: 8px;
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 13px;
  color: var(--text-muted);
}
.page-sel label { display: flex; align-items: center; gap: 4px; cursor: pointer; }
.page-sel input[type="radio"] { accent-color: var(--primary); }
.page-input {
  width: 140px;
  padding: 4px 8px;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 13px;
}
.page-input:disabled { background: #f3f4f6; color: #9ca3af; }

.file-actions { display: flex; align-items: center; gap: 8px; flex-shrink: 0; }
.handle {
  cursor: grab;
  color: #b6bfd0;
  font-size: 20px;
  line-height: 1;
  user-select: none;
}
.handle:active { cursor: grabbing; }
.remove {
  border: none;
  background: none;
  color: #b6bfd0;
  font-size: 17px;
  cursor: pointer;
  width: 30px;
  height: 30px;
  border-radius: 8px;
  line-height: 1;
}
.remove:hover { background: #fef2f2; color: var(--danger); }

/* ---------- 选项区（拆分） ---------- */
.file-info-bar {
  margin-top: 16px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 12px 16px;
  font-size: 14px;
  display: none;
}
.file-info-bar.show { display: block; }
.file-info-bar b { font-weight: 600; }

.options {
  margin-top: 16px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 18px 20px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.option label { display: flex; align-items: center; gap: 8px; font-size: 14px; cursor: pointer; }
.option input[type="radio"] { accent-color: var(--primary); }
.inline-num {
  width: 64px;
  padding: 4px 8px;
  border: 1px solid var(--border);
  border-radius: 6px;
  text-align: center;
}
.ranges {
  margin-top: 10px;
  margin-left: 26px;
  width: calc(100% - 26px);
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-family: inherit;
  font-size: 13px;
  resize: vertical;
}
.ranges:focus, .page-input:focus, .inline-num:focus { outline: 2px solid rgba(37, 99, 235, .3); border-color: var(--primary); }

/* ---------- 操作区 ---------- */
.actions {
  margin-top: 18px;
  display: flex;
  align-items: center;
  gap: 14px;
}
.btn {
  border: none;
  border-radius: 10px;
  padding: 12px 30px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: background .15s, transform .05s;
}
.btn:active { transform: scale(.98); }
.btn.primary { background: var(--primary); color: #fff; }
.btn.primary:hover:not(:disabled) { background: var(--primary-dark); }
.btn.secondary { background: #fff; color: var(--primary); border: 1px solid var(--primary); }
.btn.secondary:hover:not(:disabled) { background: #f0f6ff; }
.btn:disabled { background: #c7cedb; cursor: not-allowed; }
.status { font-size: 13px; color: var(--text-muted); }

/* ---------- 进度条 ---------- */
.progress-wrap {
  margin-top: 12px;
  display: flex;
  align-items: center;
  gap: 12px;
}
.progress-wrap.hidden { display: none; }
.progress {
  flex: 1;
  height: 8px;
  background: #e5e9f2;
  border-radius: 6px;
  overflow: hidden;
}
.progress-bar {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, #2563eb, #7c3aed);
  border-radius: 6px;
  transition: width .2s;
}
.progress-text { font-size: 12px; color: var(--text-muted); white-space: nowrap; }

/* ---------- 日志面板 ---------- */
.log-panel {
  max-width: 860px;
  margin: 0 auto 20px;
  padding: 0 20px;
  width: 100%;
}
.log-panel summary {
  cursor: pointer;
  font-size: 13px;
  color: var(--text-muted);
  padding: 6px 0;
  user-select: none;
}
.log-panel summary:hover { color: var(--primary); }
.log-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  font-size: 12px;
  color: var(--text-muted);
  margin-bottom: 8px;
}
.log-copy {
  flex-shrink: 0;
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--text);
  font-size: 12px;
  padding: 5px 12px;
  border-radius: 8px;
  cursor: pointer;
}
.log-copy:hover { border-color: var(--primary); color: var(--primary); }
#app-log {
  background: #0f172a;
  color: #a5f3fc;
  font: 12px/1.6 ui-monospace, SFMono-Regular, Consolas, monospace;
  border-radius: 10px;
  padding: 12px 14px;
  max-height: 220px;
  overflow: auto;
  white-space: pre-wrap;
  word-break: break-all;
}

/* ---------- 页脚 ---------- */
.footer {
  text-align: center;
  font-size: 12px;
  color: var(--text-muted);
  padding: 18px;
  border-top: 1px solid var(--border);
}
.footer a { color: var(--primary); text-decoration: none; }

@media (max-width: 560px) {
  .header h1 { font-size: 21px; }
  .tab { padding: 11px 16px; font-size: 14px; }
  .page-input { width: 110px; }
}