:root {
    --ink: #222;
    --line: #999;
    --line-soft: #ccc;
    --bg: #f5f5f3;
    --box: #e8e8e6;
    --box-dark: #d4d4d1;
    --tab-active: #222;
  }
  * { box-sizing: border-box; }
  body {
    margin: 0;
    font-family: 'Courier New', 'Menlo', monospace;
    background: var(--bg);
    color: var(--ink);
    font-size: 14px;
    line-height: 1.5;
  }

  /* ── Wireframe utilities ─────────────────── */
  .wf-note {
    position: fixed;
    top: 8px;
    right: 12px;
    font-size: 11px;
    color: #888;
    background: #fff;
    border: 1px dashed var(--line);
    padding: 4px 8px;
    z-index: 100;
  }
  .placeholder-text {
    background: var(--box);
    color: transparent;
    user-select: none;
    display: inline-block;
    height: 1em;
  }
  .placeholder-img {
    background: var(--box-dark);
    border: 1px dashed var(--line);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #888;
    font-size: 11px;
  }
  .label { color: #888; font-size: 11px; text-transform: uppercase; letter-spacing: 0.05em; }
  .box {
    border: 1px dashed var(--line);
    padding: 16px;
    background: #fff;
  }
  .box-fill {
    border: 1px dashed var(--line);
    background: var(--box);
    padding: 16px;
  }
  .btn {
    display: inline-block;
    border: 2px solid var(--ink);
    padding: 10px 18px;
    background: #fff;
    font-family: inherit;
    cursor: pointer;
    font-size: 13px;
  }
  .btn-primary {
    background: var(--ink);
    color: #fff;
  }
  .btn-ghost {
    border: 1px dashed var(--line);
    background: transparent;
  }
  .input {
    border: 1px solid var(--line);
    padding: 10px 12px;
    background: #fff;
    font-family: inherit;
    width: 100%;
    font-size: 13px;
  }
  .divider {
    border: none;
    border-top: 1px dashed var(--line-soft);
    margin: 24px 0;
  }
  hr.solid {
    border: none;
    border-top: 1px solid var(--line);
    margin: 0;
  }

  /* ── Tabs ─────────────────────────────────── */
  .tabs {
    position: sticky;
    top: 0;
    background: #fff;
    border-bottom: 2px solid var(--ink);
    display: flex;
    gap: 0;
    padding: 0 24px;
    z-index: 50;
  }
  .tab {
    padding: 14px 18px;
    border: 1px dashed var(--line);
    border-bottom: none;
    background: var(--bg);
    cursor: pointer;
    font-family: inherit;
    font-size: 13px;
    margin-right: -1px;
    margin-top: 8px;
  }
  .tab.active {
    background: var(--ink);
    color: #fff;
    border-color: var(--ink);
    font-weight: bold;
  }
  .tab-meta {
    margin-left: auto;
    align-self: center;
    color: #888;
    font-size: 11px;
  }

  /* ── Page container ──────────────────────── */
  .page { display: none; padding: 24px; max-width: 1280px; margin: 0 auto; }
  .page.active { display: block; }

  /* ── Common: header / footer ─────────────── */
  .site-header {
    border: 1px dashed var(--line);
    padding: 14px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: #fff;
    margin-bottom: 20px;
  }
  .site-header .logo {
    font-weight: bold;
    border: 1px solid var(--line);
    padding: 6px 12px;
  }
  .nav { display: flex; gap: 16px; align-items: center; }
  .nav a { color: var(--ink); text-decoration: none; }

  .site-footer {
    border: 1px dashed var(--line);
    padding: 20px;
    margin-top: 40px;
    background: #fff;
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 24px;
    font-size: 12px;
    color: #666;
  }

  /* ── Layouts ─────────────────────────────── */
  .grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
  .grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
  .grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }

  /* ── Hero ────────────────────────────────── */
  .hero {
    border: 2px dashed var(--line);
    background: #fff;
    padding: 48px 32px;
    text-align: center;
    margin-bottom: 24px;
  }
  .hero h1 {
    font-size: 28px;
    margin: 0 0 16px;
    line-height: 1.3;
  }
  .hero .sub { color: #555; margin-bottom: 24px; }
  .hero-form {
    display: flex;
    gap: 8px;
    max-width: 480px;
    margin: 0 auto;
  }
  .hero-form .input { flex: 1; }

  /* ── Section ─────────────────────────────── */
  section {
    margin-bottom: 32px;
  }
  section h2 {
    font-size: 18px;
    border-left: 4px solid var(--ink);
    padding-left: 10px;
    margin: 0 0 16px;
  }

  /* ── Card ────────────────────────────────── */
  .card {
    border: 1px dashed var(--line);
    background: #fff;
    padding: 20px;
  }
  .card .num {
    font-size: 24px;
    font-weight: bold;
    color: var(--ink);
    border: 1px solid var(--line);
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 10px;
  }

  /* ── Form column ─────────────────────────── */
  .auth-wrap {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0;
    border: 1px dashed var(--line);
    background: #fff;
    min-height: 600px;
  }
  .auth-wrap > div { padding: 32px; }
  .auth-wrap > div + div { border-left: 1px dashed var(--line); }
  .form-row { margin-bottom: 14px; }
  .form-row label {
    display: block;
    font-size: 11px;
    color: #888;
    text-transform: uppercase;
    margin-bottom: 4px;
  }
  .checkbox-row {
    display: flex;
    gap: 8px;
    align-items: center;
    margin-bottom: 8px;
    font-size: 12px;
  }
  .checkbox-row .cb {
    width: 14px;
    height: 14px;
    border: 1px solid var(--line);
    display: inline-block;
  }

  /* ── Mypage ──────────────────────────────── */
  .mypage-grid {
    display: grid;
    grid-template-columns: 240px 1fr;
    gap: 20px;
  }
  .side-nav {
    border: 1px dashed var(--line);
    background: #fff;
    padding: 16px;
  }
  .side-nav ul { list-style: none; padding: 0; margin: 0; }
  .side-nav li {
    padding: 10px 8px;
    border-bottom: 1px dashed var(--line-soft);
    cursor: pointer;
    font-size: 13px;
  }
  .side-nav li.active {
    background: var(--ink);
    color: #fff;
    font-weight: bold;
  }

  .biz-list {
    border: 1px dashed var(--line);
    background: #fff;
  }
  .biz-row {
    padding: 14px 16px;
    border-bottom: 1px dashed var(--line-soft);
    display: flex;
    justify-content: space-between;
    align-items: center;
  }
  .biz-row:last-child { border-bottom: none; }
  .tag {
    border: 1px solid var(--line);
    padding: 2px 8px;
    font-size: 11px;
    margin-right: 4px;
    display: inline-block;
  }
  .tag-on { background: var(--ink); color: #fff; }

  .match-list { border: 1px dashed var(--line); background: #fff; }
  .match-item {
    padding: 16px;
    border-bottom: 1px dashed var(--line-soft);
  }
  .match-item:last-child { border-bottom: none; }
  .match-meta { display: flex; gap: 8px; font-size: 11px; color: #888; margin-bottom: 6px; }
  .match-title { font-weight: bold; margin-bottom: 6px; }
  .match-foot { display: flex; justify-content: space-between; align-items: center; margin-top: 10px; }

  /* ── Admin ───────────────────────────────── */
  .admin-grid {
    display: grid;
    grid-template-columns: 200px 1fr;
    gap: 20px;
  }
  .stat-card {
    border: 1px dashed var(--line);
    background: #fff;
    padding: 16px;
  }
  .stat-card .label { display: block; margin-bottom: 6px; }
  .stat-card .value { font-size: 22px; font-weight: bold; }
  .stat-card .delta { font-size: 11px; color: #666; margin-top: 4px; }

  table.wf {
    width: 100%;
    border-collapse: collapse;
    background: #fff;
    border: 1px dashed var(--line);
    font-size: 12px;
  }
  table.wf th, table.wf td {
    border-bottom: 1px dashed var(--line-soft);
    padding: 10px 12px;
    text-align: left;
  }
  table.wf th {
    background: var(--box);
    font-weight: bold;
    text-transform: uppercase;
    font-size: 11px;
    color: #555;
  }
  table.wf tr:last-child td { border-bottom: none; }

  .chart-box {
    border: 1px dashed var(--line);
    background: var(--box);
    height: 220px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #888;
    font-size: 12px;
  }

  /* small helpers */
  .row { display: flex; gap: 8px; align-items: center; }
  .spacer { height: 12px; }
  .muted { color: #888; font-size: 12px; }
  .right { text-align: right; }
  .pill {
    border: 1px solid var(--line);
    padding: 2px 10px;
    border-radius: 999px;
    font-size: 11px;
    display: inline-block;
  }