:root {
    --bg: #f5f6f8;
    --card: #ffffff;
    --text: #15181e;
    --muted: #6b7280;
    --border: #e3e6eb;
    --accent: #3b5bdb;
    --accent-text: #ffffff;
    --up: #138a4b;
    --up-bg: #e6f6ed;
    --down: #c92a2a;
    --down-bg: #fdecec;
    --input: #ffffff;
    --shadow: 0 1px 2px rgba(16, 24, 40, .06);
  }
  @media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) {
      --bg: #0f1115;
      --card: #181b21;
      --text: #e8eaee;
      --muted: #9aa1ad;
      --border: #2a2f38;
      --accent: #6d8bff;
      --accent-text: #0f1115;
      --up: #3ddc84;
      --up-bg: #12301f;
      --down: #ff6b6b;
      --down-bg: #3a1717;
      --input: #12151a;
      --shadow: none;
    }
  }
  :root[data-theme="dark"] {
    --bg: #0f1115;
    --card: #181b21;
    --text: #e8eaee;
    --muted: #9aa1ad;
    --border: #2a2f38;
    --accent: #6d8bff;
    --accent-text: #0f1115;
    --up: #3ddc84;
    --up-bg: #12301f;
    --down: #ff6b6b;
    --down-bg: #3a1717;
    --input: #12151a;
    --shadow: none;
  }

  * { box-sizing: border-box; }
  html { -webkit-text-size-adjust: 100%; }
  body {
    margin: 0;
    background: var(--bg);
    color: var(--text);
    font: 15px/1.45 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
    padding: env(safe-area-inset-top) 0 env(safe-area-inset-bottom);
  }
  main { max-width: 980px; margin: 0 auto; padding: 16px; }
  header { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 16px; }
  h1 { font-size: 20px; margin: 0; }
  h2 { font-size: 15px; margin: 0 0 12px; }
  .muted { color: var(--muted); }
  .small { font-size: 13px; }
  .num { font-variant-numeric: tabular-nums; }
  .up { color: var(--up); }
  .down { color: var(--down); }

  .card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 16px;
    margin-bottom: 16px;
    box-shadow: var(--shadow);
  }

  /* summary */
  .summary { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
  .stat .label { font-size: 12px; color: var(--muted); text-transform: uppercase; letter-spacing: .04em; }
  .stat .value { font-size: 22px; font-weight: 650; margin-top: 2px; }
  .stat .sub { font-size: 13px; }
  .status { display: flex; align-items: center; gap: 8px; margin-top: 12px; flex-wrap: wrap; }
  .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--muted); flex: none; }
  .dot.live { background: var(--up); }
  .dot.err { background: var(--down); }

  /* forms */
  form.grid { display: grid; grid-template-columns: repeat(4, 1fr) auto; gap: 10px; align-items: end; }
  label { display: block; font-size: 12px; color: var(--muted); margin-bottom: 4px; }
  input, select {
    width: 100%;
    font: inherit;
    color: var(--text);
    background: var(--input);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 9px 10px;
    min-height: 40px;
  }
  input:focus, select:focus { outline: 2px solid var(--accent); outline-offset: -1px; }
  .field-row { display: flex; gap: 6px; }
  .field-row input { min-width: 0; }
  button {
    font: inherit;
    border: 1px solid var(--border);
    background: var(--card);
    color: var(--text);
    border-radius: 8px;
    padding: 9px 14px;
    min-height: 40px;
    cursor: pointer;
    white-space: nowrap;
  }
  button:hover { border-color: var(--muted); }
  button.primary { background: var(--accent); color: var(--accent-text); border-color: var(--accent); font-weight: 600; }
  button.link { border: none; background: none; color: var(--accent); padding: 4px 6px; min-height: 0; }
  button.icon { padding: 6px 10px; min-height: 0; }
  .hint { font-size: 12px; color: var(--muted); margin-top: 8px; }
  .error-msg { color: var(--down); font-size: 13px; margin-top: 8px; }

  /* positions table */
  table { width: 100%; border-collapse: collapse; }
  th, td { padding: 10px 8px; text-align: right; border-bottom: 1px solid var(--border); white-space: nowrap; }
  th { font-size: 12px; font-weight: 500; color: var(--muted); }
  th:first-child, td:first-child { text-align: left; }
  tbody tr.pos { cursor: pointer; }
  tbody tr.pos:hover { background: color-mix(in srgb, var(--accent) 6%, transparent); }
  .coin { font-weight: 650; }
  .pill { display: inline-block; padding: 2px 8px; border-radius: 999px; font-weight: 600; }
  .pill.up { background: var(--up-bg); }
  .pill.down { background: var(--down-bg); }
  tr.lots td { background: var(--bg); padding: 0; }
  .lots-inner { padding: 8px 12px; }
  .lot { display: flex; justify-content: space-between; align-items: center; gap: 12px; padding: 6px 0; border-bottom: 1px dashed var(--border); flex-wrap: wrap; }
  .lot:last-child { border-bottom: none; }
  .empty { text-align: center; padding: 28px 8px; color: var(--muted); }
  .table-wrap { overflow-x: auto; }

  /* mobile: positions become cards */
  .mobile-list { display: none; }
  .pcard { border: 1px solid var(--border); border-radius: 10px; padding: 12px; margin-bottom: 10px; }
  .pcard-top { display: flex; justify-content: space-between; align-items: baseline; gap: 8px; }
  .pcard-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 6px 12px; margin-top: 10px; font-size: 13px; }
  .pcard-grid div span { color: var(--muted); display: block; font-size: 11px; }

  .two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
  .settings { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; }
  .actions { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 12px; }
  .quick-out { margin-top: 12px; display: grid; grid-template-columns: auto 1fr; gap: 4px 16px; }
  .quick-out div:nth-child(even) { text-align: right; font-weight: 600; }

  @media (max-width: 720px) {
    .summary { grid-template-columns: 1fr 1fr; }
    .summary .stat:first-child { grid-column: 1 / -1; }
    form.grid { grid-template-columns: 1fr 1fr; }
    form.grid .submit { grid-column: 1 / -1; }
    .desktop-table { display: none; }
    .mobile-list { display: block; }
    .two-col { grid-template-columns: 1fr; }
    .settings { grid-template-columns: 1fr 1fr; }
  }

  /* sign-in and account */
  .header-actions { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; justify-content: flex-end; }
  .login { max-width: 380px; margin: 48px auto; }
  .login form, .pw-form { display: grid; gap: 6px; }
  .login label, .pw-form label { margin: 6px 0 0; }
  .login button { margin-top: 12px; }
  .pw-form { margin-top: 20px; padding-top: 16px; border-top: 1px solid var(--border); }
  .pw-form h2 { margin: 0; }
  .pw-form button { margin-top: 10px; justify-self: start; }
  .ok-msg { color: var(--up); }
  [hidden] { display: none !important; }

  /* exchange link */
  .ex-form { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; align-items: end; }
  .ex-form .wide { grid-column: 1 / -1; }
  .notice { margin-top: 12px; padding: 10px 12px; border-radius: 8px; background: var(--bg); border: 1px solid var(--border); font-size: 13px; }
  .notice button { margin-top: 8px; }
  .warn-list { margin: 12px 0 0; padding-left: 18px; color: var(--muted); }
  .warn-list li { margin: 4px 0; }
  details.hint summary { cursor: pointer; color: var(--accent); }
  details.hint ol { padding-left: 18px; }
  .tag { display: inline-block; font-size: 11px; padding: 1px 6px; border-radius: 4px; background: var(--bg); border: 1px solid var(--border); color: var(--muted); }
  @media (max-width: 720px) {
    .ex-form { grid-template-columns: 1fr; }
  }