/* Vector calculator styles are isolated inside the fourth tab. */
:host{display:block}
.vector-tool,
    .vector-tool * {
      box-sizing: border-box;
    }

    .vector-tool {
      --vc-ink: #20242a;
      --vc-muted: #747c86;
      --vc-line: #e5e8ec;
      --vc-soft: #f3f7f7;
      --vc-panel: #ffffff;
      --vc-accent: #188c8c;
      --vc-a: #2563eb;
      --vc-b: #d97706;
      --vc-sum: #188c8c;
      --vc-diff: #7c3aed;
      --vc-warn: #c2410c;
      --vc-shadow: 0 12px 30px rgb(23 31 42 / 5%);
      width: min(1120px, 100%);
      margin: 0 auto;
      padding: 8px 0 32px;
      color: var(--vc-ink);
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
      letter-spacing: 0;
    }

    .vector-tool > header {
      display: grid;
      grid-template-columns: minmax(0, 1fr) auto;
      gap: 18px;
      align-items: end;
      margin-bottom: 18px;
      padding: 18px 0 14px;
      border-bottom: 1px solid var(--vc-line);
    }

    .vector-tool h1 {
      margin: 0 0 8px;
      color: var(--vc-ink);
      font-size: clamp(24px, 3vw, 34px);
      line-height: 1.12;
      letter-spacing: 0;
    }

    .vector-tool .lead {
      max-width: 760px;
      margin: 0;
      color: var(--vc-muted);
      font-size: 15px;
      line-height: 1.75;
    }

    .vector-tool .toolbar {
      display: flex;
      gap: 8px;
      align-items: center;
      justify-content: flex-end;
      flex-wrap: wrap;
    }

    .vector-tool button {
      min-height: 36px;
      border: 1px solid var(--vc-line);
      background: #fff;
      color: var(--vc-ink);
      border-radius: 8px;
      padding: 7px 12px;
      font: inherit;
      font-size: 14px;
      cursor: pointer;
      transition: border-color 0.16s ease, background 0.16s ease, color 0.16s ease, box-shadow 0.16s ease;
    }

    .vector-tool button:hover {
      border-color: color-mix(in srgb, var(--vc-accent) 34%, var(--vc-line));
      color: var(--vc-accent);
    }

    .vector-tool .grid {
      display: grid;
      grid-template-columns: minmax(0, 1fr);
    }

    .vector-tool .panel {
      background: var(--vc-panel);
      border: 1px solid var(--vc-line);
      border-radius: 8px;
      box-shadow: var(--vc-shadow);
    }

    .vector-tool .panel h2,
    .vector-tool .panel h3 {
      margin: 0;
      color: var(--vc-ink);
      font-size: 17px;
      line-height: 1.25;
      letter-spacing: 0;
    }

    .vector-tool .panel-head {
      display: flex;
      justify-content: space-between;
      gap: 12px;
      align-items: center;
      padding: 12px 14px 0;
    }

    .vector-tool input {
      width: 100%;
      min-height: 32px;
      border: 1px solid var(--vc-line);
      border-radius: 8px;
      padding: 5px 9px;
      color: var(--vc-ink);
      background: #fff;
      font: 14px ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
    }

    .vector-tool input:focus,
    .vector-tool button:focus-visible {
      outline: 3px solid color-mix(in srgb, var(--vc-accent) 22%, transparent);
      outline-offset: 1px;
      border-color: var(--vc-accent);
    }

    .vector-tool .hint,
    .vector-tool .error {
      margin: 0;
      font-size: 12px;
      line-height: 1.55;
    }

    .vector-tool .hint {
      color: var(--vc-muted);
    }

    .vector-tool .error {
      min-height: 16px;
      color: var(--vc-warn);
      font-weight: 700;
    }

    .vector-tool .content {
      display: grid;
      gap: 12px;
    }

    .vector-tool .forms-grid {
      display: grid;
      grid-template-columns: repeat(2, minmax(0, 1fr));
      gap: 10px;
      padding: 12px;
    }

    .vector-tool .form-card {
      display: grid;
      gap: 4px;
      min-width: 0;
      padding: 8px 12px;
      border: 1px solid var(--vc-line);
      border-radius: 8px;
      background: #fff;
    }

    .vector-tool .form-card.a {
      border-left: 3px solid var(--vc-a);
    }

    .vector-tool .form-card.b {
      border-left: 3px solid var(--vc-b);
    }

    .vector-tool .form-card h3 {
      position: relative;
      width: max-content;
      cursor: help;
      text-decoration: underline dotted;
      text-underline-offset: 3px;
    }

    .vector-tool .form-card h3 .op-preview {
      width: min(340px, 76vw);
    }

    .vector-tool .form-card h3:hover .op-preview {
      opacity: 1;
      visibility: visible;
    }

    .vector-tool .row {
      display: grid;
      grid-template-columns: 92px minmax(0, 1fr);
      gap: 10px;
      align-items: start;
      padding: 8px 0;
      border-top: 1px solid #edf1f2;
    }

    .vector-tool .row:first-of-type {
      border-top: 0;
    }

    .vector-tool .row span {
      color: var(--vc-muted);
      font-size: 13px;
      font-weight: 700;
    }

    .vector-tool .form-card .row {
      grid-template-columns: 1fr;
      gap: 3px;
      padding: 6px 0;
    }

    .vector-tool .forms-hint {
      margin: 0;
      padding: 4px 14px 0;
    }

    .vector-tool code {
      overflow-wrap: anywhere;
      color: #1f2933;
      font: 14px ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
    }

    .vector-tool .ops {
      display: grid;
      gap: 8px;
      padding: 12px;
    }

    .vector-tool .op-row {
      position: relative;
      display: grid;
      grid-template-columns: 64px 40px repeat(2, minmax(0, 1fr));
      gap: 10px;
      align-items: center;
      padding: 7px 10px;
      border: 1px solid var(--vc-line);
      border-radius: 8px;
      background: #fff;
    }

    .vector-tool .op-row.has-preview > strong {
      cursor: help;
      text-decoration: underline dotted;
      text-underline-offset: 3px;
    }

    .vector-tool .op-preview {
      position: absolute;
      left: 8px;
      top: calc(100% + 6px);
      z-index: 30;
      width: min(380px, 92%);
      padding: 8px;
      border: 1px solid var(--vc-line);
      border-radius: 8px;
      background: #fff;
      box-shadow: 0 18px 44px rgb(23 31 42 / 22%);
      opacity: 0;
      visibility: hidden;
      transition: opacity 0.14s ease;
      pointer-events: none;
    }

    .vector-tool .op-row:hover .op-preview {
      opacity: 1;
      visibility: visible;
    }

    .vector-tool .op-symbol {
      display: inline-grid;
      place-items: center;
      width: 34px;
      height: 34px;
      border-radius: 8px;
      background: #1f2933;
      color: #fff;
      font-size: 17px;
      font-weight: 800;
    }

    .vector-tool .op-cell {
      min-width: 0;
      display: grid;
      gap: 2px;
    }

    .vector-tool .op-cell span {
      color: var(--vc-muted);
      font-size: 12px;
      font-weight: 700;
    }

    .vector-tool .op-preview svg {
      display: block;
      width: 100%;
      border: 1px solid var(--vc-line);
      border-radius: 8px;
      background: #fbfdfd;
    }

    @media (max-width: 920px) {
      .vector-tool > header,
      .vector-tool .grid,
      .vector-tool .forms-grid {
        grid-template-columns: 1fr;
      }

      .vector-tool .toolbar {
        justify-content: flex-start;
      }
    }

    @media (max-width: 620px) {

      .vector-tool .op-row {
        grid-template-columns: 1fr;
      }

      .vector-tool .row {
        grid-template-columns: 1fr;
      }
    }

    .vector-tool .op-preview { display: none; }
    .vector-tool .form-card h3:hover .op-preview, .vector-tool .op-row:hover .op-preview { display: block; }
    /* Compact layout keeps both vectors and all four results together. */
    .vector-tool { padding: 4px 0 12px; }
    .vector-tool > header { padding: 0 0 10px; margin-bottom: 10px; gap: 12px; }
    .vector-tool h1 { font-size: 24px; margin-bottom: 5px; }
    .vector-tool .lead { font-size: 12px; line-height: 1.5; }
    .vector-tool .content { gap: 10px; }
    .vector-tool .panel-head { padding: 10px 12px 0; }
    .vector-tool .panel h2, .vector-tool .panel h3 { font-size: 15px; }
    .vector-tool .forms-grid { grid-template-columns: repeat(2, minmax(0,1fr)); padding: 10px; gap: 10px; }
    .vector-tool .form-card { padding: 8px 10px; gap: 3px; }
    .vector-tool .form-card .row { grid-template-columns: 64px minmax(0,1fr); align-items: center; gap: 7px; padding: 4px 0; }
    .vector-tool .row span { font-size: 12px; }
    .vector-tool .error:empty { display: none; }
    .vector-tool .forms-hint { padding: 4px 12px 0; }
    .vector-tool .ops { padding: 10px; gap: 6px; }
    .vector-tool .op-row { grid-template-columns: 52px 30px repeat(2,minmax(0,1fr)); gap: 8px; padding: 5px 8px; }
    .vector-tool .op-symbol { width: 28px; height: 28px; font-size: 15px; }
    .vector-tool .op-cell { grid-template-columns: 38px minmax(0,1fr); align-items: baseline; gap: 5px; }
    @media (max-width: 920px) {
      .vector-tool > header { grid-template-columns: minmax(0,1fr) auto; }
    }
    @media (max-width: 680px) {
      .vector-tool > header, .vector-tool .forms-grid { grid-template-columns: minmax(0,1fr); }
      .vector-tool .op-row { grid-template-columns: 46px 28px minmax(0,1fr); }
      .vector-tool .op-cell { grid-column: 3; }
      .vector-tool input { min-height: 40px; }
      .vector-tool .toolbar button { min-height: 40px; }
    }
  
    .vector-tool { line-height: 1.4; }
.vector-tool{width:100%;padding:0;--vc-ink:#203331;--vc-accent:#18755f}
.vector-tool > header h2{font-size:18px;margin:0 0 4px}
.vector-tool .op-row.has-preview:focus-within .op-preview,
.vector-tool .form-card h3:focus .op-preview{display:block;opacity:1;visibility:visible}
.vector-tool .op-row.has-preview > strong:focus-visible,
.vector-tool .form-card h3:focus-visible{outline:2px solid var(--vc-accent);outline-offset:3px}

@media(max-width:680px){.vector-tool .op-row{grid-template-columns:64px 28px minmax(0,1fr)}.vector-tool .op-row>strong{font-size:14px}}