:root {
    /* WCAG AA を満たすコントラストに調整 */
    --bg: #14151a;
    --card: #1b1d24;
    --sheet: #20232b;
    --text: #eceef2;      /* 本文: 対 bg 約 15:1 */
    --dim: #bcc2cd;        /* 副次: 約 9:1 */
    --faint: #949bab;      /* 補足: 約 6:1（AA可） */
    --line: #353945;
    --track: #353945;
    --fill: #8b91a0;
    --safe: #65cf7b;
    --slightly: #6fa8e6;
    --ahead: #e6ac42;
    --critical: #f26a61;
    --unknown: #949bab;
    --focus: #6fa8e6;
    --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, monospace;
    --sans: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Segoe UI", sans-serif;
  }
  * { box-sizing: border-box; }
  body {
    margin: 0; background: var(--bg); color: var(--text);
    font-family: var(--sans); font-size: 16px; line-height: 1.6;
    -webkit-font-smoothing: antialiased; text-rendering: optimizeLegibility;
  }
  .wrap { max-width: 520px; margin: 0 auto; padding: 24px 26px 80px; }
  :focus-visible { outline: 2px solid var(--focus); outline-offset: 2px; border-radius: 4px; }

  /* header — TZ はカード外 */
  .top { display: flex; align-items: center; justify-content: space-between; margin-bottom: 22px; }
  .name { font-size: 14px; color: var(--dim); font-family: var(--mono); letter-spacing: .3px; }
  .top-r { display: flex; align-items: center; gap: 14px; font-family: var(--mono); font-size: 13px; }
  .tz { color: var(--faint); }
  .conn { display: inline-flex; align-items: center; gap: 7px; color: var(--dim); cursor: default; }
  .conn .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--unknown); }
  .conn.connected .dot { background: var(--safe); }
  .conn.online .dot { background: var(--ahead); }
  .conn.offline .dot { background: var(--faint); }

  .kebab { position: relative; }
  .kebab > button { background: transparent; border: 1px solid transparent; color: var(--dim); cursor: pointer;
                    font-size: 20px; line-height: 1; padding: 4px 8px; border-radius: 6px; }
  .kebab > button:hover { background: var(--line); color: var(--text); }
  .menu { display: none; position: absolute; right: 0; top: 34px; background: var(--sheet);
          border: 1px solid var(--line); border-radius: 8px; min-width: 150px; padding: 5px; z-index: 30;
          box-shadow: 0 8px 24px rgba(0,0,0,.45); }
  .menu.open { display: block; }
  .menu button { display: block; width: 100%; text-align: left; background: transparent; border: none;
                 color: var(--text); padding: 9px 11px; border-radius: 6px; font-size: 14px; cursor: pointer; font-family: var(--sans); }
  .menu button:hover { background: var(--line); }

  /* card */
  .card { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 18px 18px 16px; margin-bottom: 14px; }
  .ctx { font-family: var(--mono); font-size: 12px; color: var(--dim); letter-spacing: .4px; margin-bottom: 8px; display: flex; align-items: center; }

  /* アンカー行: 左=大きな現在日付/時刻、右=リセット3行（その高さに合わせて縦中央） */
  .anchor-row { display: flex; align-items: center; justify-content: space-between; gap: 18px; }
  .col-now { min-width: 0; }
  .reset { text-align: right; flex: none; }
  .rk { font-size: 12px; color: var(--faint); margin-bottom: 3px; }
  .anchor { font-family: var(--mono); font-weight: 400; letter-spacing: .5px; line-height: 1.1; font-size: 44px; white-space: nowrap; }
  .anchor.date { display: inline-flex; align-items: baseline; gap: 9px; }
  .anchor.time { transition: opacity .2s; }
  .anchor.time.frozen { opacity: .45; }
  .anchor .wd { color: var(--dim); font-size: .42em; white-space: nowrap; }
  .reset .rv { font-family: var(--mono); font-size: 15px; font-weight: 400; color: var(--text); letter-spacing: .3px; line-height: 1.25; white-space: nowrap; }
  .reset .rr { font-family: var(--mono); font-size: 12px; color: var(--dim); margin-top: 3px; }
  .frozentag { display: none; font-size: 12px; color: var(--faint); margin-top: 6px; }
  .anchor.time.frozen ~ .frozentag { display: block; }

  /* headline: used + delta（評価ワード廃止） */
  .line { display: flex; align-items: baseline; gap: 14px; margin: 18px 0 12px; }
  .line .used { font-family: var(--mono); font-size: 34px; font-weight: 500; }
  .line .used .u { font-size: 17px; color: var(--dim); }
  .line .delta { font-family: var(--mono); font-size: 18px; font-weight: 500; }
  .line .delta.pos { color: var(--ahead); } .line .delta.neg { color: var(--safe); }

  /* bar（評価は色で表現） */
  .track { position: relative; height: 5px; background: var(--track); border-radius: 3px; margin: 12px 0 18px; }
  .fillbar { position: absolute; left: 0; top: 0; bottom: 0; border-radius: 3px; background: var(--fill); transition: width .35s ease; }
  .fillbar.safe { background: var(--safe); } .fillbar.slightly { background: var(--slightly); }
  .fillbar.ahead { background: var(--ahead); } .fillbar.critical { background: var(--critical); } .fillbar.unknown { background: var(--fill); }
  .tick { position: absolute; top: -4px; bottom: -4px; width: 2px; background: var(--text); border-radius: 1px; }

  /* values */
  .v { display: flex; align-items: baseline; justify-content: space-between; padding: 6px 0; font-size: 14px; }
  .v .k { color: var(--dim); display: inline-flex; align-items: center; }
  .v .val { font-family: var(--mono); font-size: 15px; text-align: right; }

  /* hint tip — キーボード操作可・コントラスト確保 */
  .ht { display: inline-flex; align-items: center; justify-content: center; width: 17px; height: 17px;
        border: 1px solid var(--faint); border-radius: 50%; font-size: 11px; color: var(--dim);
        cursor: help; position: relative; margin-left: 6px; flex: none; background: transparent; }
  .ht:hover, .ht:focus-visible { color: var(--text); border-color: var(--dim); }
  .ht:hover::after, .ht:focus-visible::after {
    content: attr(data-tip); position: absolute; bottom: 150%; left: 0; transform: translateX(-8%);
    background: #262a34; border: 1px solid var(--line); color: var(--text);
    padding: 10px 12px; border-radius: 8px; width: 240px; font-size: 13px; line-height: 1.55;
    z-index: 10; white-space: normal; text-align: left; font-family: var(--sans); font-weight: 400;
    box-shadow: 0 6px 18px rgba(0,0,0,.4);
  }

  /* sections */
  .sections { margin-top: 4px; }
  details { border-bottom: 1px solid var(--line); }
  summary { cursor: pointer; font-size: 14px; color: var(--dim); list-style: none; padding: 14px 2px; display: flex; justify-content: space-between; }
  summary::-webkit-details-marker { display: none; }
  summary .chev { color: var(--faint); transition: transform .15s; }
  details[open] summary .chev { transform: rotate(90deg); }
  .sbody { padding: 2px 2px 18px; }
  .hist { font-family: var(--mono); font-size: 13px; }
  .hist .h { display: flex; justify-content: space-between; padding: 6px 0; color: var(--dim); }
  .hist .h .t { color: var(--faint); }
  .muted { color: var(--dim); font-size: 13px; }
  .btn { background: transparent; border: 1px solid var(--line); color: var(--text); border-radius: 7px;
         padding: 9px 16px; font-size: 13px; cursor: pointer; font-family: var(--sans); }
  .btn:hover { border-color: var(--dim); }
  .btn.primary { border-color: var(--slightly); background: rgba(111,168,230,.12); }
  .pick { display: flex; flex-wrap: wrap; gap: 16px; margin: 8px 0 12px; font-size: 14px; }
  .pick label { display: inline-flex; gap: 7px; align-items: center; }
  .range { display: flex; align-items: center; gap: 8px; margin-bottom: 14px; font-size: 13px; color: var(--dim); flex-wrap: wrap; }

  /* sheet（別サーフェス） */
  .backdrop { display: none; position: fixed; inset: 0; background: rgba(0,0,0,.6); z-index: 40; }
  .backdrop.open { display: block; }
  .sheet { position: fixed; z-index: 50; left: 50%; bottom: 0; transform: translateX(-50%);
           width: 100%; max-width: 480px; background: var(--sheet); border: 1px solid var(--line);
           border-radius: 14px 14px 0 0; padding: 22px 22px 30px; display: none; }
  .sheet.open { display: block; }
  .sheet h3 { margin: 0 0 5px; font-size: 17px; font-weight: 600; }
  .sheet .lead { font-size: 13px; color: var(--dim); margin: 0 0 18px; }
  .sheet .close { position: absolute; right: 14px; top: 14px; background: transparent; border: 1px solid transparent;
                  color: var(--dim); font-size: 20px; cursor: pointer; border-radius: 6px; padding: 2px 8px; }
  .sheet .close:hover { background: var(--line); color: var(--text); }
  .field { display: grid; grid-template-columns: 104px 1fr; align-items: center; gap: 12px; padding: 9px 0; }
  .field > label { font-size: 14px; color: var(--text); }
  .field .help { grid-column: 2; font-size: 12px; color: var(--faint); margin-top: -2px; }
  input, select { background: var(--bg); border: 1px solid var(--line); color: var(--text);
                  border-radius: 7px; padding: 8px 9px; font-size: 14px; font-family: var(--mono); }
  .days { display: flex; gap: 5px; }
  .days b { width: 32px; text-align: center; padding: 8px 0; font-size: 13px; font-weight: 400;
            border: 1px solid var(--line); border-radius: 7px; color: var(--faint); cursor: pointer; font-family: var(--mono); }
  .days b.on { color: var(--text); border-color: var(--dim); background: var(--line); }
  .row2 { display: flex; align-items: center; gap: 8px; }
  .sheet-actions { display: flex; justify-content: flex-end; gap: 10px; margin-top: 20px; }
  .adv { margin-top: 8px; }
  .adv > summary { font-size: 13px; color: var(--faint); border: none; padding: 10px 0; }

  .mock { margin-top: 36px; padding-top: 16px; border-top: 1px dashed var(--line); }
  .mock .l { font-size: 11px; color: var(--faint); margin-bottom: 9px; font-family: var(--mono); }
  .mock .r { display: flex; flex-wrap: wrap; gap: 6px 16px; font-size: 13px; }
  .mock a { color: var(--dim); cursor: pointer; border-bottom: 1px solid transparent; }
  .mock a:hover { color: var(--text); border-color: var(--dim); }