:root {
      --bg: #f3f3f3;
      --panel: #ffffff;
      --ink: #101010;
      --muted: #5a5a5a;
      --border: #cfcfcf;
      --accent: #1a73e8;
      --accent-2: #0b7a75;
      --ok: #1a7f37;
      --warn: #b35c00;
      --err: #b00020;
      --radius: 3px;
      --mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
    }

    * {
      box-sizing: border-box;
    }

    body {
      margin: 0;
      font-family: var(--mono);
      font-size: 15px;
      line-height: 1.55;
      background: var(--bg);
      color: var(--ink);
    }

    main {
      max-width: 1200px;
      margin: 0 auto;
      padding: 16px 16px 48px;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .panel {
      border: 1px solid var(--border);
      background: var(--panel);
      border-radius: var(--radius);
      padding: 12px;
    }

    .panel.is-collapsed #settingsBody {
      display: none;
    }

    .panel-header {
      display: flex;
      gap: 12px;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
    }

    .title {
      display: flex;
      flex-direction: column;
      gap: 4px;
    }

    .title h1 {
      margin: 0;
      font-size: 18px;
      font-weight: 700;
    }

    .title .sub {
      color: var(--muted);
      font-size: 12px;
    }

    .section-title {
      font-size: 13px;
      font-weight: 700;
      margin-bottom: 8px;
      color: var(--ink);
    }

    .section-title-row {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 8px;
    }

    .btn-small {
      padding: 2px 8px;
      font-size: 12px;
    }

    .grid-2 {
      display: grid;
      grid-template-columns: repeat(2, minmax(0, 1fr));
      gap: 10px;
    }

    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, minmax(0, 1fr));
      gap: 10px;
    }

    .row {
      display: flex;
      gap: 10px;
      flex-wrap: wrap;
      align-items: center;
    }

    .label {
      display: block;
      font-size: 12px;
      color: var(--muted);
      margin-bottom: 4px;
    }

    input[type="text"],
    input[type="password"],
    input[type="number"],
    select,
    textarea {
      width: 100%;
      font-family: var(--mono);
      font-size: 14px;
      line-height: 1.5;
      padding: 6px 8px;
      border: 1px solid var(--border);
      border-radius: var(--radius);
      background: #ffffff;
      color: var(--ink);
    }

    textarea {
      resize: vertical;
      min-height: 72px;
    }

    input:focus,
    select:focus,
    textarea:focus {
      outline: none;
      border-color: var(--accent);
    }

    button {
      font-family: var(--mono);
      font-size: 13px;
      line-height: 1.4;
      padding: 4px 8px;
      border-radius: var(--radius);
      border: 1px solid var(--border);
      background: #ffffff;
      color: var(--ink);
      cursor: pointer;
      transition: background 120ms ease, border-color 120ms ease, color 120ms ease;
    }

    button:hover {
      border-color: var(--accent);
      color: var(--accent);
    }

    button:disabled {
      opacity: 0.5;
      cursor: not-allowed;
    }

    .btn-accent {
      border-color: var(--accent);
      color: var(--accent);
    }

    .btn-ghost {
      border-color: var(--border);
      color: var(--muted);
    }

    .btn-done {
      border-color: var(--ok);
      color: var(--ok);
    }

    .help {
      font-size: 12px;
      color: var(--muted);
      margin: 6px 0 8px;
    }

    .link-underline {
      color: inherit;
      text-decoration: underline;
    }

    .actions {
      display: flex;
      gap: 8px;
      flex-wrap: wrap;
      align-items: center;
      margin: 6px 0;
    }

    .log {
      font-size: 12px;
      color: var(--muted);
      margin-top: 6px;
      min-height: 16px;
    }

    .log.is-hidden {
      visibility: hidden;
    }

    .log[data-type="ok"] {
      color: var(--ok);
    }

    .log[data-type="error"] {
      color: var(--err);
    }

    .usage-summary {
      display: grid;
      gap: 4px;
      font-size: 12px;
      color: var(--muted);
    }

    .usage-summary span:not(.usage-cost) {
      color: var(--ink);
    }

    .usage-cost {
      color: #15803d;
    }

    .price-box {
      display: grid;
      gap: 6px;
    }

    .price-grid {
      display: grid;
      grid-template-columns: auto minmax(0, 1fr);
      gap: 6px 8px;
      align-items: center;
    }

    .price-label {
      font-size: 12px;
      color: var(--muted);
    }

    .pricing-details {
      margin-top: 8px;
      border: 1px dashed var(--border);
      border-radius: var(--radius);
      padding: 6px 8px;
      background: #fafafa;
    }

    .pricing-summary {
      list-style: none;
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 8px;
      font-size: 12px;
      color: var(--muted);
    }

    .pricing-summary::-webkit-details-marker {
      display: none;
    }

    .pricing-summary::after {
      content: "펼치기";
      font-size: 12px;
      color: var(--muted);
    }

    .pricing-details[open] .pricing-summary::after {
      content: "접기";
    }

    .pricing-details .price-wrapper {
      margin-top: 8px;
    }

    .pricing-details .help {
      margin: 6px 0 0;
    }

    .preset-chips {
      display: flex;
      flex-wrap: wrap;
      gap: 6px;
      margin-top: 6px;
    }

    .chip {
      display: inline-flex;
      flex-direction: column;
      padding: 4px 8px;
      font-size: 12px;
      line-height: 1.3;
      text-align: left;
      align-items: flex-start;
    }

    .chip[disabled] {
      opacity: 0.5;
      cursor: not-allowed;
      pointer-events: none;
    }

    .chip-title {
      font-weight: 600;
    }

    .chip-sub {
      font-size: 11px;
      color: var(--muted);
      word-break: break-all;
    }

    .chunk-list,
    .translate-list {
      display: grid;
      gap: 10px;
    }

    .chunk-card {
      border: 1px solid var(--border);
      border-radius: var(--radius);
      padding: 8px;
      display: grid;
      gap: 6px;
    }

    .chunk-details {
      display: grid;
      gap: 6px;
    }

    .chunk-details[hidden] {
      display: none;
    }

    .chunk-extra {
      display: grid;
      gap: 6px;
    }

    .chunk-extra[hidden] {
      display: none;
    }

    .chunk-head {
      display: flex;
      justify-content: space-between;
      align-items: center;
      gap: 8px;
      flex-wrap: wrap;
    }

    .chunk-title {
      font-size: 13px;
      font-weight: 700;
    }

    .chunk-actions {
      display: flex;
      gap: 6px;
      flex-wrap: wrap;
    }

    .chunk-meta {
      font-size: 12px;
      color: var(--muted);
    }

    .status {
      font-size: 12px;
      padding: 2px 6px;
      border-radius: var(--radius);
      border: 1px solid var(--border);
      text-transform: lowercase;
    }

    .status.pending {
      color: var(--muted);
    }

    .status.active {
      color: var(--accent);
      border-color: var(--accent);
    }

    .status.done {
      color: var(--ok);
      border-color: var(--ok);
    }

    .status.error {
      color: var(--err);
      border-color: var(--err);
    }

    .error-text {
      font-size: 12px;
      color: var(--err);
    }

    @media (max-width: 900px) {
      .grid-2,
      .grid-3 {
        grid-template-columns: 1fr;
      }
    }

    @media (prefers-reduced-motion: reduce) {
      * {
        transition: none !important;
        animation: none !important;
      }
    }