* { margin: 0; padding: 0; box-sizing: border-box; }
:root {
  --primary: #2563eb; --primary-hover: #1d4ed8; --primary-light: #eff6ff;
  --danger: #ef4444; --danger-hover: #dc2626; --danger-light: #fef2f2;
  --success: #10b981; --bg: #f1f5f9; --card-bg: #fff;
  --text: #1e293b; --text-secondary: #64748b; --border: #e2e8f0;
  --radius: 12px; --radius-sm: 8px;
  --shadow: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
}
body { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif; background: var(--bg); color: var(--text); min-height: 100vh; }

.header { background: var(--card-bg); border-bottom: 1px solid var(--border); position: sticky; top: 0; z-index: 100; }
.header-inner { max-width: 900px; margin: 0 auto; padding: 0 16px; display: flex; align-items: center; justify-content: space-between; height: 56px; }
.logo { font-size: 20px; font-weight: 700; color: var(--primary); }
.nav-tabs { display: flex; gap: 4px; }
.tab-btn { padding: 8px 16px; border: none; background: transparent; color: var(--text-secondary); font-size: 14px; font-weight: 500; border-radius: var(--radius-sm); cursor: pointer; transition: 0.2s; }
.tab-btn:hover { background: var(--bg); color: var(--text); }
.tab-btn.active { background: var(--primary-light); color: var(--primary); }
.badge { display: inline-block; background: var(--primary); color: #fff; font-size: 10px; padding: 1px 5px; border-radius: 8px; margin-left: 4px; }

.container { max-width: 900px; margin: 0 auto; padding: 16px; display: flex; flex-direction: column; gap: 12px; }
.card { background: var(--card-bg); border-radius: var(--radius); box-shadow: var(--shadow); padding: 16px; }

/* 上传区域 */
.upload-card { 
  padding: 0; position: relative; height: 320px; background: #f8fafc; 
  border: 2px dashed #94a3b8; border-radius: var(--radius); overflow: hidden; transition: all 0.2s;
}
.upload-card:hover { border-color: var(--primary); background: var(--primary-light); }
.upload-inner { position: absolute; top: 0; left: 0; width: 100%; height: 100%; display: flex; flex-direction: column; align-items: center; justify-content: center; padding: 20px; text-align: center; cursor: pointer; }
.upload-icon { font-size: 40px; margin-bottom: 10px; }
.upload-title { font-size: 15px; font-weight: 600; margin-bottom: 6px; color: var(--text); }
.upload-hint { font-size: 12px; color: var(--text-secondary); margin-bottom: 16px; }
.upload-btns { display: flex; gap: 12px; justify-content: center; }
.upload-btn { padding: 8px 24px; border-radius: 20px; font-size: 14px; font-weight: 500; cursor: pointer; transition: 0.2s; border: none; outline: none; }
.upload-btn.primary { background: var(--primary); color: #fff; box-shadow: 0 2px 6px rgba(37, 99, 235, 0.3); }
.upload-btn.primary:hover { background: var(--primary-hover); }
.upload-btn.secondary { background: #fff; color: var(--text); border: 1px solid var(--border); }
.upload-btn.secondary:hover { background: var(--bg); }
.preview-wrap { position: absolute; top: 0; left: 0; width: 100%; height: 100%; display: flex; align-items: center; justify-content: center; background: #fff; border-radius: var(--radius-sm); }
.preview-img { max-width: 95%; max-height: 95%; object-fit: contain; cursor: zoom-in; transition: 0.2s; border-radius: 4px; }
.preview-img:hover { opacity: 0.9; }
.btn-close-preview { position: absolute; top: 12px; right: 12px; width: 32px; height: 32px; border-radius: 50%; border: none; background: rgba(0,0,0,0.6); color: #fff; cursor: pointer; display: flex; align-items: center; justify-content: center; font-size: 16px; z-index: 10; }
.btn-close-preview:hover { background: rgba(0,0,0,0.8); }

/* 控制栏与单选框 */
.control-card { display: flex; flex-direction: column; gap: 16px; }
.control-section { display: flex; flex-direction: column; gap: 8px; }
.control-label-row { font-size: 13px; font-weight: 600; color: var(--text); }
.radio-group { display: flex; flex-wrap: wrap; gap: 10px; }
.radio-item { 
  display: flex; align-items: center; gap: 8px; 
  font-size: 14px; color: var(--text-secondary); cursor: pointer;
  background: #f8fafc; padding: 10px 16px; border-radius: var(--radius-sm);
  border: 1px solid var(--border); transition: 0.2s; user-select: none;
}
.radio-item:hover { border-color: var(--primary); background: var(--primary-light); }
.radio-item input[type="radio"] { accent-color: var(--primary); width: 16px; height: 16px; cursor: pointer; }
.radio-item:has(input:checked) { border-color: var(--primary); background: var(--primary-light); color: var(--primary); font-weight: 500; }

/* 语言下拉框 */
.control-row { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.control-label { font-size: 13px; font-weight: 500; color: var(--text-secondary); white-space: nowrap; min-width: 70px; }
.select { flex: 1; min-width: 120px; padding: 9px 12px; border: 1px solid var(--border); border-radius: var(--radius-sm); font-size: 14px; outline: none; background: #fff; cursor: pointer; }
.select:focus { border-color: var(--primary); }

/* 按钮 */
.btn-row { display: flex; gap: 10px; margin-top: 4px; }
.btn { padding: 10px 20px; border: none; border-radius: var(--radius-sm); font-size: 14px; font-weight: 500; cursor: pointer; transition: 0.2s; display: inline-flex; align-items: center; justify-content: center; gap: 6px; }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }
.btn-primary { background: var(--primary); color: #fff; flex: 1; }
.btn-primary:hover:not(:disabled) { background: var(--primary-hover); }
.btn-secondary { background: var(--primary-light); color: var(--primary); flex: 1; }
.btn-secondary:hover:not(:disabled) { background: #dbeafe; }
.btn-sm { padding: 6px 14px; font-size: 13px; background: var(--bg); color: var(--text); }
.btn-danger { background: var(--danger) !important; color: #fff !important; }

/* ================== 结果对比区（左右并排） ================== */
.result-row {
  display: flex;
  gap: 12px;
  align-items: stretch; /* 让左右卡片高度保持一致 */
}
.result-card { 
  flex: 1; 
  min-width: 0; /* 防止 flex 子项内容溢出 */
  display: flex; 
  flex-direction: column; 
  gap: 10px; 
}
.result-header { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 8px; }
.result-left { display: flex; align-items: center; gap: 10px; }
.result-actions { display: flex; gap: 8px; flex-wrap: wrap; }
.action-btn { padding: 5px 14px; border-radius: 6px; font-size: 13px; cursor: pointer; border: 1px solid var(--border); background: #fff; color: var(--text-secondary); transition: 0.2s; }
.action-btn:hover { background: var(--bg); color: var(--text); }
.action-btn.save-btn { background: var(--primary); color: #fff; border: none; }
.action-btn.save-btn:hover { background: var(--primary-hover); }

/* 清空按钮改红色 */
#btnClearResult { color: var(--danger); border-color: var(--danger); background: var(--danger-light); }
#btnClearResult:hover { background: var(--danger); color: #fff; }

.result-label { font-size: 14px; font-weight: 600; }
.result-status { font-size: 12px; color: var(--text-secondary); }

/* 文本区与展示区撑满剩余空间 */
.result-textarea { width: 100%; flex: 1; min-height: 200px; padding: 12px; border: 1px solid var(--border); border-radius: var(--radius-sm); font-size: 14px; line-height: 1.7; resize: vertical; outline: none; font-family: inherit; }
.result-textarea:focus { border-color: var(--primary); }
.result-display { padding: 12px; background: var(--bg); border-radius: var(--radius-sm); font-size: 14px; line-height: 1.7; flex: 1; min-height: 200px; white-space: pre-wrap; overflow-y: auto; }

/* 历史记录 */
.history-toolbar { display: flex; align-items: center; justify-content: space-between; margin-bottom: 8px; }
.history-actions { display: flex; gap: 8px; }
.history-list { display: flex; flex-direction: column; gap: 8px; }
.history-item { display: flex; align-items: center; gap: 10px; padding: 12px; background: #fff; border: 1px solid var(--border); border-radius: var(--radius-sm); cursor: pointer; }
.history-item:hover { border-color: var(--primary); }
.history-checkbox { width: 18px; height: 18px; accent-color: var(--primary); }
.history-date { font-size: 11px; color: var(--text-secondary); }
.history-preview { font-size: 13px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.empty-state { text-align: center; padding: 40px; color: var(--text-secondary); }

/* 设置页面 */
.settings-card h3 { font-size: 16px; margin-bottom: 8px; }
.settings-hint { font-size: 12px; color: var(--text-secondary); margin-bottom: 20px; }
.settings-form { display: flex; flex-direction: column; gap: 16px; margin-bottom: 20px; }
.form-group { display: grid; grid-template-columns: 120px 1fr; align-items: center; gap: 12px; }
.form-label { font-size: 13px; font-weight: 500; color: var(--text-secondary); text-align: right; white-space: nowrap; }
.form-input { width: 100%; padding: 10px 14px; border: 1px solid var(--border); border-radius: var(--radius-sm); font-size: 14px; outline: none; transition: 0.2s; }
.form-input:focus { border-color: var(--primary); box-shadow: 0 0 0 3px var(--primary-light); }
.settings-btn-row { display: flex; gap: 12px; margin-top: 0; }

/* 弹窗 */
.modal-overlay { position: fixed; inset: 0; background: rgba(0,0,0,0.5); display: flex; align-items: center; justify-content: center; z-index: 200; padding: 16px; }
.modal { background: #fff; border-radius: var(--radius); width: 100%; max-width: 640px; max-height: 85vh; display: flex; flex-direction: column; }
.modal-header { display: flex; justify-content: space-between; padding: 16px; border-bottom: 1px solid var(--border); font-weight: 600; }
.modal-body { padding: 16px; overflow-y: auto; }
.detail-img { max-width: 100%; border-radius: 8px; }
.detail-text { padding: 12px; background: var(--bg); border-radius: 8px; font-size: 14px; line-height: 1.7; white-space: pre-wrap; }
.btn-close { background: transparent; border: none; font-size: 18px; cursor: pointer; color: var(--text-secondary); padding: 4px; }

.image-modal { background: rgba(0,0,0,0.9); z-index: 999; cursor: zoom-out; }
.big-image { max-width: 95%; max-height: 95%; object-fit: contain; border-radius: 4px; box-shadow: 0 10px 30px rgba(0,0,0,0.5); }

.toast { position: fixed; top: 70px; left: 50%; transform: translateX(-50%) translateY(-20px); background: #1e293b; color: #fff; padding: 10px 20px; border-radius: 20px; font-size: 13px; opacity: 0; transition: 0.3s; z-index: 300; pointer-events: none; max-width: 90vw; text-align: center; }
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }
.toast.error { background: var(--danger); }
.spinner { display: inline-block; width: 16px; height: 16px; border: 2px solid rgba(255,255,255,0.3); border-top-color: #fff; border-radius: 50%; animation: spin 0.6s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }

/* 移动端适配 */
@media (max-width: 768px) {
  .header-inner { padding: 0 12px; }
  .logo { font-size: 17px; }
  .tab-btn { padding: 6px 10px; font-size: 13px; }
  .container { padding: 10px; gap: 10px; }
  .upload-card { height: 260px; }
  .upload-inner { padding: 16px; }
  .upload-btns { flex-direction: column; width: 100%; gap: 8px; }
  .upload-btn { width: 100%; padding: 10px; }
  .control-row { flex-direction: column; align-items: stretch; }
  .control-label { min-width: auto; text-align: left; }
  .radio-group { flex-direction: column; }
  .radio-item { width: 100%; }
  .btn-row { flex-direction: column; }
  .btn { width: 100%; padding: 12px; }
  .form-group { grid-template-columns: 1fr; gap: 6px; }
  .form-label { text-align: left; }
  .settings-btn-row { flex-direction: column; }
  /* 移动端左右布局改为上下堆叠 */
  .result-row { flex-direction: column; }
  .result-actions { gap: 6px; width: 100%; justify-content: flex-end; }
  .result-textarea, .result-display { min-height: 150px; }
}