:root {
      --bg: #f7fafc;
      --panel: #ffffff;
      --ink: #0f172a;
      --muted: #475569;
      --line: #cbd5e1;
      --accent: #0f766e;
      --danger: #b91c1c;
      --warn: #b45309;
      --radius: 12px;
    }
    * { box-sizing: border-box; }
    body {
      margin: 0;
      font: 14px/1.45 "IBM Plex Sans", "Avenir Next", "Segoe UI", sans-serif;
      color: var(--ink);
      background:
        radial-gradient(circle at 10% 10%, #d6f2ff 0, transparent 28%),
        radial-gradient(circle at 90% 85%, #ffe9c7 0, transparent 28%),
        var(--bg);
      padding: 20px;
    }
    .wrap {
      max-width: 1280px;
      margin: 0 auto;
      display: grid;
      gap: 14px;
    }
    .card {
      background: var(--panel);
      border: 1px solid var(--line);
      border-radius: var(--radius);
      padding: 14px;
      box-shadow: 0 10px 24px rgba(15, 23, 42, 0.06);
    }
    h1, h2, h3 { margin: 0; }
    h1 { font-size: 22px; }
    h2 { font-size: 16px; margin-bottom: 10px; }
    h3 { font-size: 14px; margin-bottom: 8px; }
    .muted { color: var(--muted); }
    .mt-8 { margin-top: 8px; }
    .mb-8 { margin-bottom: 8px; }
    .head {
      display: flex;
      gap: 10px;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
    }
    .controls {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
      align-items: center;
    }
    .form-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
      gap: 10px;
    }
    .field {
      display: grid;
      gap: 5px;
    }
    .weekly-wrap {
      grid-column: 1 / -1;
      display: none;
    }
    .field label {
      font-size: 12px;
      color: var(--muted);
      font-weight: 600;
    }
    input, button, select, textarea {
      font: inherit;
      border: 1px solid var(--line);
      border-radius: 10px;
      padding: 8px 10px;
      background: #fff;
      color: var(--ink);
    }
    button {
      cursor: pointer;
      font-weight: 600;
    }
    button.primary {
      background: var(--accent);
      border-color: var(--accent);
      color: #fff;
    }
    button.ghost {
      background: #f8fafc;
    }
    button.danger {
      background: #fff1f2;
      border-color: #fecdd3;
      color: #be123c;
    }
    .msg { min-height: 22px; }
    .msg.error { color: var(--danger); }
    .msg.warn { color: var(--warn); }
    .grid {
      display: grid;
      gap: 14px;
    }
    .grid.two {
      grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    }
    table {
      width: 100%;
      border-collapse: collapse;
      font-size: 12px;
    }
    th, td {
      text-align: left;
      border-bottom: 1px solid var(--line);
      padding: 7px;
      vertical-align: top;
    }
    th { color: var(--muted); }
    code {
      font-family: "JetBrains Mono", "SFMono-Regular", monospace;
      font-size: 11px;
    }
    pre {
      margin: 0;
      background: #0b1220;
      color: #f8fafc;
      border-radius: 10px;
      padding: 10px;
      overflow: auto;
      max-height: 320px;
    }
    .pill {
      border: 1px solid #8fd3ca;
      background: #ecfeff;
      color: #0f766e;
      border-radius: 999px;
      padding: 3px 10px;
      font-weight: 700;
      font-size: 12px;
    }
    .weekday {
      display: flex;
      gap: 8px;
      flex-wrap: wrap;
    }
    .weekday label {
      border: 1px solid var(--line);
      border-radius: 999px;
      padding: 4px 8px;
      font-size: 12px;
      color: var(--muted);
      display: inline-flex;
      gap: 5px;
      align-items: center;
      background: #fff;
    }
    .split {
      display: grid;
      gap: 14px;
      grid-template-columns: 1fr;
    }
    @media (min-width: 980px) {
      .split {
        grid-template-columns: 1fr 1fr;
      }
    }
    details {
      border: 1px solid var(--line);
      border-radius: 10px;
      padding: 8px;
      background: #f8fafc;
    }
    details summary {
      cursor: pointer;
      font-weight: 600;
      color: var(--muted);
    }
    textarea {
      width: 100%;
      min-height: 220px;
      font-family: "JetBrains Mono", "SFMono-Regular", monospace;
      font-size: 12px;
      margin-top: 8px;
    }