:root {
        --bg: #f6efe4;
        --paper: #fffaf2;
        --panel: #f0e4d2;
        --ink: #2f2419;
        --muted: #776554;
        --accent: #8b5e34;
        --accent-strong: #6d4521;
        --line: #d6c1a8;
        --warn: #a1452f;
        --ok: #2f6b3d;
        --shadow: 0 18px 40px rgba(77, 49, 20, 0.12);
      }

      * {
        box-sizing: border-box;
      }

      body {
        margin: 0;
        font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei",
          sans-serif;
        color: var(--ink);
        background:
          radial-gradient(circle at top left, rgba(139, 94, 52, 0.18), transparent 28%),
          radial-gradient(circle at bottom right, rgba(109, 69, 33, 0.16), transparent 24%),
          linear-gradient(135deg, #f8f1e7, #f4eadb 45%, #efe1cd);
        min-height: 100vh;
      }

      .shell {
        width: min(1180px, calc(100vw - 32px));
        margin: 32px auto;
      }

      .hero {
        background: linear-gradient(135deg, rgba(255, 250, 242, 0.92), rgba(240, 228, 210, 0.9));
        border: 1px solid rgba(139, 94, 52, 0.15);
        border-radius: 28px;
        box-shadow: var(--shadow);
        padding: 28px;
      }

      .eyebrow {
        display: inline-flex;
        align-items: center;
        padding: 6px 12px;
        border-radius: 999px;
        background: rgba(139, 94, 52, 0.1);
        color: var(--accent-strong);
        font-size: 13px;
        letter-spacing: 0.08em;
      }

      h1 {
        margin: 14px 0 10px;
        font-size: clamp(30px, 5vw, 52px);
        line-height: 1.05;
      }

      .subhead {
        margin: 0;
        max-width: 760px;
        color: var(--muted);
        font-size: 16px;
        line-height: 1.7;
      }

      .primary-grid {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 18px;
        margin-top: 24px;
      }

      .secondary-section {
        margin-top: 16px;
      }

      .mapping-directory {
        border: 1px solid var(--line);
        border-radius: 18px;
        background: rgba(255, 250, 242, 0.92);
        box-shadow: var(--shadow);
        overflow: hidden;
      }

      .mapping-directory summary {
        list-style: none;
        cursor: pointer;
        display: flex;
        align-items: baseline;
        justify-content: space-between;
        gap: 10px;
        padding: 14px 16px;
        color: var(--accent-strong);
        font-weight: 700;
        background: rgba(139, 94, 52, 0.08);
      }

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

      .mapping-directory summary small {
        font-size: 12px;
        color: var(--muted);
        font-weight: 500;
      }

      .mapping-card {
        border: 0;
        border-radius: 0;
        box-shadow: none;
        background: transparent;
      }

      .card {
        background: rgba(255, 250, 242, 0.92);
        border: 1px solid var(--line);
        border-radius: 24px;
        padding: 20px;
        box-shadow: var(--shadow);
      }

      h2 {
        margin: 0 0 8px;
        font-size: 20px;
      }

      .hint {
        margin: 0 0 14px;
        color: var(--muted);
        font-size: 14px;
        line-height: 1.6;
      }

      .hint a {
        color: var(--accent-strong);
        font-weight: 600;
      }

      textarea {
        width: 100%;
        min-height: 320px;
        padding: 16px;
        border: 1px solid var(--line);
        border-radius: 18px;
        resize: vertical;
        background: rgba(255, 255, 255, 0.72);
        color: var(--ink);
        font: inherit;
        line-height: 1.7;
      }

      textarea:focus {
        outline: 2px solid rgba(139, 94, 52, 0.25);
        border-color: var(--accent);
      }

      .actions {
        display: flex;
        gap: 10px;
        flex-wrap: wrap;
        margin-top: 14px;
      }


      button {
        appearance: none;
        border: 0;
        border-radius: 999px;
        padding: 12px 18px;
        font: inherit;
        cursor: pointer;
        transition: transform 160ms ease, opacity 160ms ease, background 160ms ease;
      }

      button:hover {
        transform: translateY(-1px);
      }

      .primary {
        background: var(--accent);
        color: #fffaf2;
      }

      .secondary {
        background: rgba(139, 94, 52, 0.1);
        color: var(--accent-strong);
      }

      .sort-btn.active {
        background: var(--accent-strong);
        color: #fffaf2;
      }

      .status {
        margin-top: 14px;
        font-size: 14px;
        min-height: 22px;
      }

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

      .status.warn {
        color: var(--warn);
      }

      .output-box {
        min-height: 190px;
        border-radius: 18px;
        border: 1px dashed var(--line);
        background: rgba(255, 255, 255, 0.6);
        padding: 16px;
        white-space: pre-wrap;
        line-height: 1.8;
      }

      .meta {
        display: grid;
        gap: 12px;
        margin-top: 16px;
      }

      .pill {
        display: inline-flex;
        width: fit-content;
        padding: 7px 12px;
        border-radius: 999px;
        background: rgba(109, 69, 33, 0.08);
        color: var(--accent-strong);
        font-size: 13px;
      }

      ul {
        margin: 8px 0 0;
        padding-left: 18px;
        color: var(--muted);
        line-height: 1.7;
      }

      @media (max-width: 980px) {
        .primary-grid {
          grid-template-columns: 1fr;
        }

        textarea {
          min-height: 220px;
        }
      }

      .footer {
        margin-top: 18px;
        margin-bottom: 28px;
      }

      .footer-text {
        margin: 0;
        padding: 14px 16px;
        border: 1px solid var(--line);
        border-radius: 14px;
        background: rgba(255, 250, 242, 0.85);
        color: var(--muted);
        font-size: 14px;
        line-height: 1.6;
      }

      .footer-text a {
        color: var(--accent-strong);
        font-weight: 600;
      }