/* ====== 亮色主题变量 ====== */
  :root {
    --bg: #f8f9fa;
    --card-bg: #ffffff;
    --text: #212529;
    --text-secondary: #6c757d;
    --border: #dee2e6;
    --accent: #4f46e5;
    --accent-hover: #4338ca;
    --accent-soft: rgba(79,70,229,0.10);
    --input-bg: #ffffff;
    --pre-bg: #f6f8fa;
    --pre-text: #1b1f23;
    --tab-bg: #e9ecef;
    --tab-active-bg: #ffffff;
    --radius: 8px;
    --shadow: 0 1px 3px rgba(0,0,0,0.06);
    --sticky-top: 20px;
  }

  /* ====== 黑暗主题变量 ====== */
  [data-theme="dark"] {
    --bg: #0d1117;
    --card-bg: #161b22;
    --text: #e6edf3;
    --text-secondary: #8b949e;
    --border: #30363d;
    --accent: #818cf8;
    --accent-hover: #6366f1;
    --accent-soft: rgba(129,140,248,0.15);
    --input-bg: #0d1117;
    --pre-bg: #0d1117;
    --pre-text: #e6edf3;
    --tab-bg: #21262d;
    --tab-active-bg: #161b22;
    --shadow: 0 1px 3px rgba(0,0,0,0.3);
  }

  * { box-sizing: border-box; margin: 0; padding: 0; }
  body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans SC", sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    padding: 20px;
    transition: background 0.2s, color 0.2s;
  }
  .container { max-width: 1400px; margin: 0 auto; }

  /* ====== 头部 ====== */
  header {
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    padding: 24px 0 20px;
    text-align: center;
    grid-column: 1 / -1;
  }
  header h1 { font-size: 22px; font-weight: 700; }
  header p { color: var(--text-secondary); margin-top: 2px; font-size: 13px; }

  /* ====== 主题切换按钮 ====== */
  .theme-toggle {
    position: absolute;
    right: 0;
    top: 50%;
    transform: translateY(-50%);
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 50%;
    width: 36px;
    height: 36px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text);
    transition: background 0.2s, border-color 0.2s;
    flex-shrink: 0;
  }
  .theme-toggle:hover { border-color: var(--accent); }
  .theme-toggle svg { width: 16px; height: 16px; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }

  /* ====== 左右双栏布局 ====== */
  .layout {
    display: grid;
    grid-template-columns: 1fr 420px;
    gap: 20px;
    align-items: start;
  }
  .layout-left {
    min-width: 0;
  }
  .layout-right {
    min-width: 0;
    align-self: stretch;
    /* 撑满网格行高，为 sticky 面板提供滚动空间 */
  }

  /* ====== 右侧固定面板 ====== */
  .sticky-panel {
    position: sticky;
    top: 20px;
    max-height: calc(100vh - 40px);
    display: flex;
    flex-direction: column;
    gap: 16px;
    min-height: 0;
    overflow-y: auto;
    padding-right: 4px;
  }

  /* ====== 平台页签 ====== */
  .platform-groups {
    display: grid;
    gap: 10px;
    margin-bottom: 16px;
  }
  .platform-group {
    display: grid;
    gap: 8px;
  }
  .platform-group-title {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    font-weight: 700;
    color: var(--text);
  }
  .platform-tabs {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    background: var(--tab-bg);
    border-radius: var(--radius);
    padding: 4px;
  }
  .platform-tab {
    flex: 0 1 auto;
    min-width: 120px;
    padding: 8px 16px;
    font-size: 13px;
    font-weight: 500;
    text-align: center;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    background: transparent;
    color: var(--text-secondary);
    transition: all 0.2s;
  }
  .platform-tab.active {
    background: var(--tab-active-bg);
    color: var(--accent);
    box-shadow: var(--shadow);
  }
  .platform-tab:hover:not(.active) { color: var(--text); }
  .platform-tab .api-badge {
    display: inline-block;
    font-size: 10px;
    font-weight: 400;
    padding: 1px 6px;
    border-radius: 8px;
    background: var(--accent-soft);
    vertical-align: middle;
  }

  /* ====== 卡片 ====== */
  .card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 20px;
    margin-bottom: 14px;
    box-shadow: var(--shadow);
    transition: background 0.2s, border-color 0.2s;
  }
  .card-title {
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 14px;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--border);
  }

  /* ====== 表单 ====== */
  .form-row { margin-bottom: 14px; }
  .form-row:last-child { margin-bottom: 0; }
  .form-label {
    display: flex;
    align-items: baseline;
    gap: 6px;
    margin-bottom: 3px;
    flex-wrap: wrap;
  }
  .form-label label { font-size: 13px; font-weight: 500; }
  .form-label .hint {
    font-size: 11px;
    color: var(--text-secondary);
    line-height: 1.4;
  }
  input, textarea, select {
    width: 100%;
    padding: 7px 10px;
    font-size: 13px;
    font-family: "SF Mono", "Fira Code", "Cascadia Code", monospace;
    border: 1px solid var(--border);
    border-radius: 6px;
    background: var(--input-bg);
    color: var(--text);
    transition: border-color 0.15s, background 0.2s, color 0.2s;
  }
  input:focus, textarea:focus, select:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-soft);
  }
  textarea { resize: vertical; min-height: 72px; }
  select { cursor: pointer; }

  /* ====== 开关 ====== */
  .toggle-row {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 10px;
  }
  .toggle-switch {
    position: relative;
    display: inline-block;
    width: 36px;
    height: 20px;
    flex-shrink: 0;
  }
  .toggle-switch input { opacity: 0; width: 0; height: 0; }
  .toggle-slider {
    position: absolute;
    cursor: pointer;
    top: 0; left: 0; right: 0; bottom: 0;
    background: var(--border);
    border-radius: 20px;
    transition: 0.2s;
  }
  .toggle-slider:before {
    position: absolute;
    content: "";
    height: 14px; width: 14px;
    left: 3px; bottom: 3px;
    background: #fff;
    border-radius: 50%;
    transition: 0.2s;
  }
  .toggle-switch input:checked + .toggle-slider { background: var(--accent); }
  .toggle-switch input:checked + .toggle-slider:before { transform: translateX(16px); }

  /* ====== 可折叠区块 ====== */
  details {
    border: 1px solid var(--border);
    border-radius: var(--radius);
    margin-bottom: 14px;
    overflow: hidden;
  }
  details > summary {
    padding: 10px 20px;
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    background: var(--card-bg);
    color: var(--text-secondary);
    list-style: none;
    display: flex;
    align-items: center;
    gap: 6px;
    transition: background 0.2s, color 0.2s;
  }
  details > summary::-webkit-details-marker { display: none; }
  details > summary:hover { background: var(--bg); color: var(--text); }
  details > summary::before {
    content: "›";
    display: inline-block;
    font-size: 16px;
    font-weight: 700;
    transition: transform 0.2s;
    width: 14px;
    text-align: center;
  }
  details[open] > summary::before { transform: rotate(90deg); }
  details[open] > summary { color: var(--accent); }
  details .details-inner { padding: 14px 20px; background: var(--card-bg); }

  /* ====== 按钮 ====== */
  .btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 10px 24px;
    font-size: 14px;
    font-weight: 500;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    transition: background 0.15s, opacity 0.15s;
    width: 100%;
  }
  .btn-primary { background: var(--accent); color: #fff; }
  .btn-primary:hover { background: var(--accent-hover); }
  .btn-primary:disabled { opacity: 0.5; cursor: not-allowed; }
  .btn-secondary { background: var(--tab-bg); color: var(--text); }
  .btn-secondary:hover { background: var(--border); }
  .btn-sm { padding: 4px 10px; font-size: 11px; width: auto; }

  /* ====== JSON 预览 ====== */
  .preview-card { flex: 0 0 auto; }
  .preview-card pre {
    background: var(--pre-bg);
    color: var(--pre-text);
    padding: 14px;
    border-radius: 6px;
    font-size: 12px;
    overflow-x: auto;
    white-space: pre-wrap;
    word-break: break-all;
    min-height: 200px;
    max-height: 32vh;
    overflow-y: auto;
    transition: background 0.2s, color 0.2s;
  }

  /* ====== 响应结果 ====== */
  .response-card { display: none; margin-top: 20px; }
  .response-card.visible { display: block; }
  .response-grid {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 14px;
    align-items: stretch;
  }
  .response-pane {
    min-width: 0;
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 10px;
    background: var(--card-bg);
  }
  .response-card pre {
    background: var(--pre-bg);
    color: var(--pre-text);
    padding: 14px;
    border-radius: 6px;
    font-size: 12px;
    overflow-x: auto;
    white-space: pre-wrap;
    word-break: break-all;
    height: 62vh;
    max-height: 62vh;
    overflow-y: auto;
    transition: background 0.2s, color 0.2s;
  }
  .response-explain {
    height: 62vh;
    max-height: 62vh;
    overflow-y: auto;
    padding-right: 2px;
    margin-bottom: 10px;
  }
  .response-overview {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 8px;
    margin-bottom: 10px;
  }
  .response-metric {
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 8px 10px;
    background: var(--card-bg);
  }
  .metric-label {
    display: block;
    color: var(--text-secondary);
    font-size: 11px;
    margin-bottom: 2px;
  }
  .metric-value {
    display: block;
    color: var(--text);
    font-family: "SF Mono", "Fira Code", "Cascadia Code", monospace;
    font-size: 12px;
    word-break: break-all;
  }
  .response-section-title {
    font-size: 12px;
    font-weight: 600;
    color: var(--text);
    margin: 10px 0 6px;
  }
  .assistant-output {
    background: var(--pre-bg);
    color: var(--pre-text);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 10px;
    font-size: 13px;
    white-space: pre-wrap;
    word-break: break-word;
    margin-bottom: 8px;
  }
  .response-field {
    border: 1px solid var(--border);
    border-radius: 6px;
    margin-bottom: 8px;
    background: var(--card-bg);
  }
  .response-field summary {
    padding: 8px 10px;
    font-size: 12px;
    color: var(--text);
  }
  .response-field .details-inner {
    padding: 8px 10px;
  }
  .field-path {
    font-family: "SF Mono", "Fira Code", "Cascadia Code", monospace;
    font-weight: 600;
  }
  .field-type {
    color: var(--text-secondary);
    font-size: 11px;
    margin-left: 6px;
  }
  .field-desc {
    font-size: 12px;
    color: var(--text-secondary);
    margin-bottom: 6px;
  }
  .field-json-path {
    display: inline-block;
    font-family: "SF Mono", "Fira Code", "Cascadia Code", monospace;
    font-size: 11px;
    color: var(--accent);
    background: var(--accent-soft);
    border-radius: 4px;
    padding: 2px 5px;
    margin-bottom: 6px;
  }
  .field-value {
    background: var(--pre-bg);
    color: var(--pre-text);
    border-radius: 6px;
    padding: 8px;
    font-size: 11px;
    white-space: pre-wrap;
    word-break: break-all;
    max-height: 180px;
    overflow: auto;
  }
  .raw-json-panel {
    margin-bottom: 0;
  }
  .raw-json-panel pre {
    min-height: 0;
  }
  .platform-actions {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    margin: 0 0 12px;
  }
  .compact-help {
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 10px;
    margin-bottom: 14px;
    font-size: 12px;
    line-height: 1.6;
    color: var(--text-secondary);
    background: var(--accent-soft);
  }
  .compact-help strong,
  .compact-help code {
    color: var(--text);
  }
  .cost-card {
    margin-top: 12px;
  }
  .usage-panel {
    display: grid;
    gap: 10px;
  }
  .usage-price-note {
    font-size: 11px;
    color: var(--text-secondary);
    line-height: 1.5;
  }
  .usage-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 8px;
  }
  .usage-cell {
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 8px;
    background: var(--card-bg);
    min-width: 0;
  }
  .usage-label {
    display: block;
    font-size: 11px;
    color: var(--text-secondary);
    margin-bottom: 3px;
  }
  .usage-value {
    display: block;
    font-family: "SF Mono", "Fira Code", "Cascadia Code", monospace;
    font-size: 12px;
    color: var(--text);
    word-break: break-all;
  }
  .response-actions {
    display: flex;
    gap: 8px;
    align-items: center;
    flex-wrap: wrap;
    justify-content: flex-end;
  }

  /* ====== 状态标签 ====== */
  .status-badge {
    display: inline-block;
    padding: 1px 7px;
    border-radius: 10px;
    font-size: 11px;
    font-weight: 500;
    margin-left: 6px;
  }
  .status-2xx { background: #d1fae5; color: #065f46; }
  .status-4xx { background: #fee2e2; color: #991b1b; }
  .status-5xx { background: #fee2e2; color: #991b1b; }
  .status-err { background: #fef3c7; color: #92400e; }

  /* ====== 工具类 ====== */
  .flex-row { display: flex; gap: 8px; align-items: center; }
  .flex-between { display: flex; justify-content: space-between; align-items: center; }
  .grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
  .grid-3 { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 10px; }
  .mono-help { font-family: "SF Mono", "Fira Code", "Cascadia Code", monospace; font-size: 11px; }
  .text-sm { font-size: 12px; color: var(--text-secondary); }
  .builder-row { display: grid; grid-template-columns: 1fr 130px 90px 1fr 34px; gap: 8px; align-items: start; margin-bottom: 8px; }
  .kv-row { display: grid; grid-template-columns: 1fr 140px 1.5fr 34px; gap: 8px; align-items: start; margin-bottom: 8px; }
  .tool-builder { border: 1px dashed var(--border); border-radius: 6px; padding: 10px; margin-bottom: 10px; }
  .array-item { border: 1px dashed var(--border); border-radius: 6px; padding: 10px; margin-bottom: 10px; }
  .array-item-header { display: flex; gap: 8px; align-items: center; justify-content: space-between; margin-bottom: 8px; }
  .content-row { display: grid; grid-template-columns: 120px 1fr 34px; gap: 8px; align-items: start; margin-bottom: 8px; }
  .tool-row { display: grid; grid-template-columns: 180px 1fr 34px; gap: 8px; align-items: start; }
  .checkbox-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 8px; }
  .checkbox-item { display: flex; gap: 7px; align-items: flex-start; font-size: 12px; color: var(--text); }
  .checkbox-item input { width: auto; margin-top: 2px; }

  /* ====== 响应式：窄屏回退到单列 ====== */
  @media (max-width: 960px) {
    .layout {
      grid-template-columns: 1fr;
    }
    .layout-right {
      order: -1;
    }
    .sticky-panel {
      position: static;
      max-height: none;
    }
    .preview-card pre { max-height: 300px; min-height: 120px; }
    .response-grid { grid-template-columns: 1fr; }
    .response-explain, .response-card pre {
      height: 420px;
      max-height: 420px;
    }
    .usage-grid { grid-template-columns: 1fr; }
  }
  @media (max-width: 640px) {
    body { padding: 10px; }
    header { padding: 16px 0 12px; }
    .theme-toggle { right: 0; width: 32px; height: 32px; }
    .card { padding: 14px; margin-bottom: 10px; }
    .grid-2, .grid-3 { grid-template-columns: 1fr; }
    .response-overview { grid-template-columns: 1fr; }
    .builder-row, .kv-row, .content-row, .tool-row { grid-template-columns: 1fr; }
    details .details-inner { padding: 10px 14px; }
  }