:root {
        color-scheme: light;
        --bg: #f5f7f4;
        --surface: #ffffff;
        --ink: #1d2522;
        --muted: #68756f;
        --line: #d8e1dc;
        --accent: #14756f;
        --danger: #b23636;
        --shadow: 0 18px 42px rgba(29, 37, 34, 0.09);
        font-family: "Segoe UI", Arial, sans-serif;
      }

      * {
        box-sizing: border-box;
      }

      body {
        margin: 0;
        min-height: 100vh;
        background: var(--bg);
        color: var(--ink);
      }

      button,
      input,
      textarea {
        font: inherit;
      }

      .shell {
        width: min(1100px, calc(100% - 28px));
        margin: 0 auto;
        padding: 28px 0;
        display: grid;
        gap: 18px;
      }

      .topbar,
      .panel,
      .user-card {
        background: var(--surface);
        border: 1px solid var(--line);
        border-radius: 8px;
        box-shadow: var(--shadow);
      }

      .topbar {
        padding: 18px;
        display: flex;
        justify-content: space-between;
        gap: 16px;
        align-items: center;
      }

      h1,
      h2,
      h3,
      p {
        margin-top: 0;
      }

      p {
        color: var(--muted);
      }

      .button-row,
      .user-actions {
        display: flex;
        gap: 10px;
        flex-wrap: wrap;
      }

      button,
      .link-button {
        min-height: 40px;
        border: 1px solid var(--line);
        border-radius: 8px;
        background: var(--surface);
        color: var(--ink);
        padding: 0 14px;
        font-weight: 800;
        cursor: pointer;
        text-decoration: none;
        display: inline-flex;
        align-items: center;
      }

      .primary {
        background: var(--accent);
        color: white;
        border-color: var(--accent);
      }

      .danger {
        background: #fff1f1;
        color: var(--danger);
        border-color: #f0c6c6;
      }

      .panel {
        padding: 18px;
      }

      .status-line {
        min-height: 22px;
        color: var(--muted);
        font-weight: 700;
      }

      .status-line.error {
        color: var(--danger);
      }

      .stats-grid,
      .users-grid {
        display: grid;
        gap: 14px;
      }

      .stats-grid {
        grid-template-columns: repeat(4, minmax(130px, 1fr));
      }

      .stat {
        border: 1px solid var(--line);
        border-radius: 8px;
        padding: 14px;
      }

      .stat span {
        color: var(--muted);
      }

      .stat strong {
        display: block;
        font-size: 2rem;
        margin-top: 6px;
      }

      .user-card {
        padding: 16px;
        display: grid;
        grid-template-columns: 1fr auto;
        gap: 12px;
        align-items: start;
      }

      .user-card h3 {
        margin-bottom: 5px;
      }

      .meta {
        color: var(--muted);
        margin-bottom: 0;
      }

      textarea,
      input {
        width: 100%;
        border: 1px solid var(--line);
        border-radius: 8px;
        padding: 10px 12px;
        background: white;
        color: var(--ink);
      }

      textarea {
        resize: vertical;
      }

      @media (max-width: 720px) {
        .topbar,
        .user-card {
          grid-template-columns: 1fr;
          flex-direction: column;
          align-items: stretch;
        }

        .stats-grid {
          grid-template-columns: repeat(2, minmax(0, 1fr));
        }
      }

.badge {
  display: inline-block;
  min-width: 22px;
  padding: 1px 8px;
  border-radius: 999px;
  background: #c93838;
  color: #fff;
  font-size: 13px;
  font-weight: 800;
  text-align: center;
}

.log-list {
  display: grid;
  gap: 6px;
  max-height: 480px;
  overflow: auto;
  font-size: 13.5px;
}

.log-row {
  display: grid;
  grid-template-columns: 150px 1fr;
  gap: 10px;
  padding: 8px 10px;
  border-radius: 8px;
  background: rgba(0, 0, 0, 0.03);
}

.log-row.alert {
  background: #fff1f1;
}

.log-row.new {
  outline: 2px solid #c93838;
}

.log-row time {
  color: #666;
  font-variant-numeric: tabular-nums;
}

.invite-code {
  font-family: ui-monospace, Menlo, monospace;
  font-size: 16px;
  padding: 10px;
  border-radius: 8px;
  background: #f4f1ea;
  word-break: break-all;
  user-select: all;
}

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

.form-row input {
  flex: 1;
  min-width: 180px;
}

.hidden {
  display: none !important;
}

select {
  min-height: 40px;
  padding: 0 10px;
  border-radius: 8px;
  border: 1px solid #ddd;
  font: inherit;
}