:root {
  --bg: #f8f9fa; --card-bg: #fff; --text: #1a1a2e; --text2: #5a6270; --text3: #a0a8b4;
  --border: #e4e7eb; --primary: #2563eb; --primary-hover: #1d4ed8; --primary-light: #dbeafe;
  --accent: #7c3aed; --danger: #dc2626; --success: #059669; --warning: #d97706;
  --radius: 8px; --radius-lg: 12px; --shadow: 0 1px 3px rgba(0,0,0,.08), 0 1px 2px rgba(0,0,0,.04);
  --shadow-lg: 0 4px 12px rgba(0,0,0,.1); --sidebar-w: 240px; --preview-w: 320px;
  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: "JetBrains Mono", "SF Mono", monospace;
}
.dark {
  --bg: #0f172a; --card-bg: #1e293b; --text: #e2e8f0; --text2: #94a3b8; --text3: #475569;
  --border: #334155; --primary: #3b82f6; --primary-hover: #60a5fa; --primary-light: #1e40af40;
  --accent: #a78bfa; --warning: #fbbf24;
  --shadow: 0 1px 3px rgba(0,0,0,.3); --shadow-lg: 0 4px 12px rgba(0,0,0,.4);
}

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

/* Skip navigation */
.skip-nav { position: absolute; left: -9999px; top: auto; width: 1px; height: 1px; overflow: hidden; }
.skip-nav:focus { position: fixed; left: 16px; top: 16px; width: auto; height: auto; padding: 8px 16px; background: var(--primary); color: #fff; border-radius: var(--radius); z-index: 9999; font-size: 14px; text-decoration: none; }

body {
  font-family: var(--font-sans); background: var(--bg); color: var(--text);
  min-height: 100vh; font-size: 14px; line-height: 1.5;
  transition: background .2s, color .2s;
  -webkit-font-smoothing: antialiased;
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
}

main { display: flex; gap: 16px; padding: 16px; max-width: 1440px; margin: 0 auto; min-height: 100vh; }

/* ===== 暗夜模式按钮 ===== */
.theme-toggle {
  position: fixed; bottom: 20px; right: 20px; width: 44px; height: 44px;
  background: var(--card-bg); border: 1px solid var(--border); border-radius: 50%;
  cursor: pointer; font-size: 18px; z-index: 100; box-shadow: var(--shadow-lg);
  transition: transform .2s, box-shadow .2s;
  display: flex; align-items: center; justify-content: center;
}
.theme-toggle:hover { transform: scale(1.1); box-shadow: 0 6px 20px rgba(0,0,0,.15); }
.theme-toggle:focus-visible { outline: 2px solid var(--primary); outline-offset: 2px; }

/* ===== 侧边栏 ===== */
.sidebar {
  width: var(--sidebar-w); flex-shrink: 0; background: var(--card-bg);
  border-radius: var(--radius-lg); padding: 20px; box-shadow: var(--shadow);
  height: fit-content; position: sticky; top: 16px; z-index: 10; transition: background .2s, box-shadow .2s;
}
.sidebar-brand { display: flex; align-items: center; gap: 8px; margin-bottom: 4px; }
.brand-icon { font-size: 20px; }
.sidebar-brand h1 { font-size: 16px; font-weight: 700; letter-spacing: -0.02em; }
.sidebar-desc { font-size: 12px; color: var(--text2); margin-bottom: 14px; }
.sidebar-links { margin-bottom: 14px; }
.sidebar-links a {
  color: var(--primary); text-decoration: none; font-size: 12px; font-weight: 500;
  transition: color .15s;
}
.sidebar-links a:hover { color: var(--primary-hover); text-decoration: underline; }
.sidebar-links a:visited { color: var(--accent); }
.api-key-group { display: flex; flex-direction: column; gap: 8px; }
.api-key-group input {
  width: 100%; padding: 10px 12px; border: 1px solid var(--border); border-radius: var(--radius);
  font-size: 13px; background: var(--bg); color: var(--text); transition: border-color .15s, box-shadow .15s;
}
.api-key-group input:focus {
  outline: none; border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-light);
}
.btn-fetch-models {
  width: 100%; padding: 10px; background: var(--primary); color: #fff;
  border: none; border-radius: var(--radius); cursor: pointer; font-size: 13px;
  font-weight: 600; transition: background .15s, transform .1s;
}
.btn-fetch-models:hover { background: var(--primary-hover); }
.btn-fetch-models:active { transform: scale(0.98); }
.btn-fetch-models:focus-visible { outline: 2px solid var(--primary); outline-offset: 2px; }
.btn-fetch-models:disabled { opacity: .6; cursor: not-allowed; }
.concurrency-group { margin-top: 14px; display: flex; align-items: center; gap: 8px; }
.concurrency-group label { font-size: 12px; color: var(--text2); font-weight: 500; }
.concurrency-group input {
  width: 60px; padding: 6px 8px; border: 1px solid var(--border); border-radius: var(--radius);
  font-size: 13px; background: var(--bg); color: var(--text); transition: border-color .15s, box-shadow .15s;
}
.concurrency-group input:focus {
  outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px var(--primary-light);
}

/* ===== 内容区 ===== */
.content { flex: 1; min-width: 0; display: flex; flex-direction: column; gap: 12px; }
.card {
  background: var(--card-bg); border-radius: var(--radius-lg); padding: 20px;
  box-shadow: var(--shadow); transition: background .2s, box-shadow .2s; overflow: hidden;
}
.card h2 { font-size: 15px; font-weight: 700; margin-bottom: 6px; letter-spacing: -0.01em; }
.card-desc { font-size: 12px; color: var(--text2); margin-bottom: 14px; }

.mode-tabs { display: flex; gap: 4px; margin-bottom: 16px; background: var(--bg); padding: 3px; border-radius: var(--radius); }
.mode-tab {
  padding: 8px 16px; border: none; background: transparent; color: var(--text2);
  border-radius: 6px; cursor: pointer; font-size: 13px; font-weight: 500;
  transition: background .15s, color .15s, box-shadow .15s; flex: 1; text-align: center;
}
.mode-tab:hover { color: var(--text); }
.mode-tab.active { background: var(--card-bg); color: var(--primary); box-shadow: var(--shadow); font-weight: 600; }
.mode-tab:focus-visible { outline: 2px solid var(--primary); outline-offset: -2px; }

.tab-content { display: none; }
.tab-content.active { display: block; animation: fadeIn .2s ease-out; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(4px); } to { opacity: 1; transform: translateY(0); } }

.form-group { margin-bottom: 12px; }
.form-group label {
  display: block; font-size: 12px; color: var(--text2); margin-bottom: 5px;
  font-weight: 600; text-transform: uppercase; letter-spacing: 0.03em;
}
.form-group textarea, .form-group select, .form-group input[type="number"] {
  width: 100%; padding: 10px 12px; border: 1px solid var(--border); border-radius: var(--radius);
  font-size: 14px; background: var(--bg); color: var(--text);
  transition: border-color .15s, box-shadow .15s; resize: vertical; font-family: inherit;
}
.form-group textarea:focus, .form-group select:focus, .form-group input:focus {
  outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px var(--primary-light);
}
.form-row { display: flex; gap: 10px; }
.form-row .form-group { flex: 1; }

.upload-area {
  border: 2px dashed var(--border); border-radius: var(--radius-lg); padding: 24px;
  text-align: center; cursor: pointer; transition: all .15s; color: var(--text2);
}
.upload-area:hover, .upload-area.drag-over {
  border-color: var(--primary); background: var(--primary-light);
}
.upload-area svg { margin-bottom: 8px; opacity: .6; }
.upload-area p { font-size: 13px; }
.preview-img { max-width: 100%; max-height: 160px; border-radius: var(--radius); object-fit: contain; }

.btn-row { display: flex; gap: 8px; margin-top: 12px; }
.btn-primary {
  padding: 10px 24px; background: var(--primary); color: #fff; border: none;
  border-radius: var(--radius); cursor: pointer; font-size: 14px; font-weight: 600;
  transition: background .15s, transform .1s;
}
.btn-primary:hover { background: var(--primary-hover); }
.btn-primary:active { transform: scale(0.97); }
.btn-primary:disabled { opacity: .5; transform: none; cursor: not-allowed; }
.btn-primary:focus-visible { outline: 2px solid var(--primary); outline-offset: 2px; }
.btn-secondary {
  padding: 10px 16px; background: var(--bg); color: var(--text); border: 1px solid var(--border);
  border-radius: var(--radius); cursor: pointer; font-size: 13px; font-weight: 500;
  transition: border-color .15s, color .15s, background .15s;
}
.btn-secondary:hover { border-color: var(--primary); color: var(--primary); }
.btn-secondary:focus-visible { outline: 2px solid var(--primary); outline-offset: 2px; }

/* ===== 批量 ===== */
.batch-progress { margin-top: 12px; }
.progress-bar { height: 6px; background: var(--border); border-radius: 3px; overflow: hidden; margin-bottom: 6px; }
.progress-fill { height: 100%; background: var(--primary); border-radius: 3px; transition: width .3s; width: 0; }
.progress-text { font-size: 12px; color: var(--text2); font-variant-numeric: tabular-nums; }

/* ===== 任务状态 ===== */
.status-text { font-size: 14px; padding: 8px 0; }
.status-text.loading { color: var(--primary); }
.status-text.success { color: var(--success); }
.status-text.error { color: var(--danger); }
.loading-spinner {
  display: inline-block; width: 14px; height: 14px;
  border: 2px solid var(--border); border-top-color: var(--primary);
  border-radius: 50%; animation: spin .6s linear infinite;
  margin-right: 6px; vertical-align: middle;
}
@keyframes spin { to { transform: rotate(360deg); } }
.task-query { display: flex; gap: 8px; margin: 8px 0; }
.task-query input {
  flex: 1; padding: 8px 12px; border: 1px solid var(--border); border-radius: var(--radius);
  font-size: 13px; background: var(--bg); color: var(--text); transition: border-color .15s, box-shadow .15s;
}
.task-query input:focus {
  outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px var(--primary-light);
}

/* ===== 搜索 ===== */
.search-input {
  width: 100%; padding: 8px 12px; border: 1px solid var(--border); border-radius: var(--radius);
  font-size: 13px; background: var(--bg); color: var(--text); margin-bottom: 8px;
}
.search-input:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px var(--primary-light); }
.card-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 8px; }
.card-header h2 { margin: 0; }
.btn-text {
  background: none; border: none; color: var(--danger); cursor: pointer;
  font-size: 12px; padding: 4px 8px; border-radius: 4px; transition: background .15s;
  font-weight: 500;
}
.btn-text:hover { background: rgba(220,38,38,.08); }
.btn-text:focus-visible { outline: 2px solid var(--danger); outline-offset: 1px; }

/* ===== 历史 ===== */
.history-list { max-height: 280px; overflow-y: auto; }
.history-item {
  display: flex; align-items: center; gap: 8px; padding: 8px 10px;
  border-radius: var(--radius); cursor: pointer; font-size: 12px;
  transition: background .1s;
}
.history-item:hover { background: var(--bg); }
.task-status { min-width: 18px; text-align: center; font-size: 12px; font-weight: 700; }
.task-status.completed { color: var(--success); }
.task-status.failed { color: var(--danger); }
.task-status.pending { color: var(--warning); }
.task-model { font-weight: 600; min-width: 80px; font-family: var(--font-mono); font-size: 11px; }
.task-prompt { color: var(--text2); flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.task-time { color: var(--text3); font-size: 11px; white-space: nowrap; font-variant-numeric: tabular-nums; }

/* ===== 预览 ===== */
.preview-panel { width: var(--preview-w); flex-shrink: 0; display: flex; flex-direction: column; gap: 12px; }
.preview-area { text-align: center; min-height: 100px; display: flex; flex-direction: column; align-items: center; justify-content: center; overflow: hidden; }
.preview-area img { max-width: 100%; border-radius: var(--radius-lg); box-shadow: var(--shadow-lg); cursor: pointer; transition: transform .2s; }
.preview-area img:hover { transform: scale(1.02); }
.download-btn {
  display: block; width: 100%; margin-top: 10px; padding: 10px;
  background: var(--primary); color: #fff; border: none; border-radius: var(--radius);
  cursor: pointer; font-size: 13px; font-weight: 600; transition: background .15s;
}
.download-btn:hover { background: var(--primary-hover); }
.download-btn:focus-visible { outline: 2px solid var(--primary); outline-offset: 2px; }

/* ===== 图库 ===== */
.gallery-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
  gap: 6px; max-height: 480px; overflow-y: auto; padding: 2px;
}
.gallery-item {
  position: relative; border-radius: var(--radius); overflow: hidden;
  background: var(--bg); border: 1px solid var(--border); cursor: pointer;
  transition: transform .15s, box-shadow .15s; aspect-ratio: 1;
}
.gallery-item:hover { transform: translateY(-2px); box-shadow: var(--shadow-lg); }
.gallery-item img { width: 100%; height: 100%; object-fit: cover; display: block; }
.gallery-info { padding: 4px 6px; position: absolute; bottom: 0; left: 0; right: 0;
  background: linear-gradient(transparent, rgba(0,0,0,.7)); color: #fff; }
.gallery-prompt { font-size: 10px; display: block; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.gallery-model { font-size: 9px; opacity: .8; }
.gallery-actions {
  position: absolute; top: 4px; right: 4px; display: none; gap: 3px;
}
.gallery-item:hover .gallery-actions { display: flex; }
.gallery-actions button {
  background: rgba(0,0,0,.7); color: #fff; border: none; border-radius: 4px;
  padding: 4px 8px; font-size: 11px; cursor: pointer; transition: background .15s;
  backdrop-filter: blur(4px);
}
.gallery-actions button:hover { background: rgba(0,0,0,.9); }

/* ===== 灯箱 ===== */
.lightbox {
  display: none; position: fixed; inset: 0; background: rgba(0,0,0,.92);
  z-index: 999; align-items: center; justify-content: center; cursor: pointer;
  backdrop-filter: blur(8px);
}
.lightbox.active { display: flex; animation: fadeIn .2s; }
.lightbox img { max-width: 92vw; max-height: 88vh; border-radius: var(--radius-lg); box-shadow: 0 8px 40px rgba(0,0,0,.5); }
.lightbox-close {
  position: absolute; top: 20px; right: 24px; color: #fff; font-size: 28px;
  cursor: pointer; width: 44px; height: 44px; display: flex; align-items: center;
  justify-content: center; border-radius: 50%; background: rgba(255,255,255,.1);
  transition: background .15s;
}
.lightbox-close:hover { background: rgba(255,255,255,.2); }
.lightbox-info {
  position: absolute; bottom: 24px; left: 50%; transform: translateX(-50%);
  color: #fff; text-align: center; max-width: 80vw; padding: 12px 20px;
  background: rgba(0,0,0,.6); border-radius: var(--radius);
  backdrop-filter: blur(8px);
}
.lightbox-info .lb-prompt { font-size: 13px; margin-bottom: 4px; }
.lightbox-info .lb-model { font-size: 11px; opacity: .7; }

/* ===== 滚动条 ===== */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--text3); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--text2); }

/* ===== 空状态 ===== */
.empty-hint { font-size: 13px; color: var(--text3); text-align: center; padding: 16px; }

/* ===== 响应式 ===== */
main { overflow-x: hidden; }
@media (max-width: 1100px) {
  .preview-panel { width: 280px; }
}
@media (max-width: 900px) {
  main { flex-direction: column; padding: 12px; }
  .sidebar { width: 100%; position: static; }
  .preview-panel { width: 100%; }
  .form-row { flex-wrap: wrap; }
  .form-row .form-group { min-width: 120px; }
}
@media (max-width: 480px) {
  .mode-tabs { flex-wrap: wrap; }
  .btn-row { flex-wrap: wrap; }
  .btn-row button { flex: 1; min-width: 100px; }
}