:root {
      --ink: #122033;
      --muted: #687993;
      --line: #d4dfeb;
      --panel: #ffffff;
      --soft: #eef5fb;
      --blue: var(--accent, #0f4d7f);
      --blue-2: var(--accent-500, #23679c);
      --green: #16895a;
      --danger: #c9362f;
      --shadow: 0 22px 55px rgba(29, 55, 84, .14);
    }

    * { box-sizing: border-box; }
    body {
      margin: 0;
      min-height: 100vh;
      font-family: "Aptos", "Segoe UI", sans-serif;
      color: var(--ink);
      background: linear-gradient(135deg, #f7fbff 0%, #dfeaf4 100%);
    }
    .topbar {
      display: flex;
      align-items: center;
      gap: 18px;
      padding: 28px 40px;
      background: linear-gradient(120deg, var(--accent-700), var(--accent-500));
      color: white;
      border-bottom-left-radius: 28px;
      border-bottom-right-radius: 28px;
      box-shadow: var(--shadow);
    }
    .back {
      color: white;
      text-decoration: none;
      border: 1px solid rgba(255,255,255,.22);
      padding: 14px 22px;
      border-radius: 14px;
      font-weight: 800;
      background: rgba(255,255,255,.08);
    }
    .badge {
      width: 58px;
      height: 58px;
      display: grid;
      place-items: center;
      border-radius: 16px;
      background: rgba(255,255,255,.1);
      border: 1px solid rgba(255,255,255,.2);
      font-weight: 900;
      font-size: 24px;
    }
    .topbar h1 { margin: 0; font-size: 30px; }
    .topbar p { margin: 4px 0 0; color: rgba(255,255,255,.68); font-size: 18px; }
    .shell {
      width: min(1560px, calc(100% - 56px));
      margin: 52px auto;
      display: grid;
      grid-template-columns: minmax(0, 1fr) 430px;
      gap: 26px;
      align-items: start;
    }
    .panel {
      background: var(--panel);
      border: 1px solid var(--line);
      border-radius: 22px;
      box-shadow: var(--shadow);
      overflow: hidden;
    }
    .panel-head {
      padding: 32px 34px;
      border-bottom: 1px solid var(--line);
    }
    .eyebrow {
      display: inline-flex;
      padding: 8px 16px;
      border-radius: 999px;
      background: var(--soft);
      color: var(--blue);
      text-transform: uppercase;
      letter-spacing: .12em;
      font-weight: 900;
      font-size: 13px;
    }
    h2 { margin: 18px 0 8px; font-size: 34px; }
    .hint { color: var(--muted); font-size: 18px; line-height: 1.5; }
    .panel-body { padding: 30px 34px 34px; }
    .grid {
      display: grid;
      grid-template-columns: repeat(2, minmax(0, 1fr));
      gap: 20px;
    }
    label { display: block; font-weight: 800; color: #2d3a4d; margin-bottom: 8px; }
    input, select, textarea {
      width: 100%;
      border: 1px solid var(--line);
      border-radius: 14px;
      padding: 14px 16px;
      color: var(--ink);
      font: inherit;
      background: white;
      outline: none;
    }
    textarea { min-height: 96px; resize: vertical; }
    input:focus, select:focus, textarea:focus { border-color: var(--blue-2); box-shadow: 0 0 0 4px rgba(35,103,156,.12); }
    .full { grid-column: 1 / -1; }
    .vendor-row {
      display: grid;
      grid-template-columns: 1fr auto;
      gap: 12px;
      align-items: end;
    }
    .line-card {
      border: 1px solid var(--line);
      border-radius: 18px;
      padding: 22px;
      margin-top: 18px;
      background: #fbfdff;
    }
    .line-head {
      display: flex;
      justify-content: space-between;
      align-items: center;
      margin-bottom: 18px;
      font-weight: 900;
    }
    .actions {
      display: flex;
      gap: 12px;
      justify-content: flex-end;
      margin-top: 24px;
      flex-wrap: wrap;
    }
    button {
      border: 0;
      border-radius: 14px;
      padding: 14px 20px;
      font-weight: 900;
      font-size: 16px;
      cursor: pointer;
      color: var(--ink);
      background: #eaf1f7;
    }
    .primary { background: var(--blue); color: white; }
    .danger { color: var(--danger); background: #fff1f1; }
    .success { color: var(--green); background: #ecf9f3; }
    .status { margin-top: 18px; color: var(--muted); font-weight: 800; }
    .status.ok { color: var(--green); }
    .status.err { color: var(--danger); }
    .side-list { display: grid; gap: 12px; margin-top: 18px; }
    .purchase-item {
      border: 1px solid var(--line);
      border-radius: 16px;
      padding: 16px;
      background: #f8fbff;
    }
    .purchase-item strong { display: block; font-size: 17px; }
    .purchase-item span { color: var(--muted); display: block; margin-top: 4px; }
    @media (max-width: 980px) {
      .shell { grid-template-columns: 1fr; width: min(100% - 28px, 760px); }
      .grid { grid-template-columns: 1fr; }
      .topbar { padding: 22px; }
    }

    /* Shared header treatment for the spare-parts workflows. */
    .topbar > a:first-child:not(.primary) {
      color: white;
      text-decoration: none;
      border: 1px solid rgba(255,255,255,.22);
      padding: 14px 22px;
      border-radius: 14px;
      font-weight: 800;
      background: rgba(255,255,255,.08);
    }
    .topbar > a:first-child:not(.primary):hover { background: rgba(255,255,255,.16); }
    .topbar > a.primary { display: none; }
    .shell > section:only-child { grid-column: 1 / -1; }