:root {
  --bg: #f4f5f7;
  --card: #ffffff;
  --ink: #1d2530;
  --ink-soft: #5b6675;
  --line: #e2e5ea;
  --brand: #2f6fed;
  --brand-ink: #ffffff;
  --danger: #d64545;
  --ok: #1e9e6a;
  --warn: #c9820a;
  --radius: 10px;
  --shadow: 0 1px 3px rgba(20, 30, 45, .08), 0 6px 20px rgba(20, 30, 45, .06);
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #12151b;
    --card: #1b1f27;
    --ink: #e7ebf1;
    --ink-soft: #9aa5b3;
    --line: #2c323d;
    --brand: #4d86f7;
    --shadow: 0 1px 3px rgba(0, 0, 0, .4), 0 8px 24px rgba(0, 0, 0, .3);
  }
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font: 15px/1.55 -apple-system, "Segoe UI", "Noto Sans TC", "Microsoft JhengHei", sans-serif;
  color: var(--ink);
  background: var(--bg);
}
.hidden { display: none !important; }
h1, h2, h3 { margin: 0 0 .6em; }
h2 { font-size: 1.1rem; }
h3 { font-size: .98rem; color: var(--ink-soft); }
a { color: var(--brand); }

/* ── 按鈕 ── */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: .4em;
  padding: .5em .9em; border: 1px solid var(--line); border-radius: 8px;
  background: var(--card); color: var(--ink); font: inherit; cursor: pointer;
  text-decoration: none; white-space: nowrap;
}
.btn:hover { border-color: var(--brand); }
.btn.primary { background: var(--brand); border-color: var(--brand); color: var(--brand-ink); }
.btn.primary:hover { filter: brightness(1.06); }
.btn.danger { color: var(--danger); border-color: color-mix(in srgb, var(--danger) 40%, var(--line)); }
.btn.tiny { padding: .3em .6em; font-size: .85rem; }
.btn.line { background: #06c755; border-color: #06c755; color: #fff; }
.btn:disabled { opacity: .5; cursor: not-allowed; }

/* ── 登入 / overlay ── */
.overlay {
  position: fixed; inset: 0; z-index: 50;
  background: rgba(12, 16, 22, .55);
  display: flex; align-items: flex-start; justify-content: center;
  padding: 5vh 16px; overflow: auto;
}
.login-box {
  background: var(--card); border-radius: var(--radius); box-shadow: var(--shadow);
  padding: 26px; width: min(420px, 100%); display: flex; flex-direction: column; gap: 12px;
}
.login-box h1 { font-size: 1.25rem; margin: 0; }
.login-box .hint { margin: 0; color: var(--ink-soft); font-size: .9rem; }
.err { color: var(--danger); font-size: .9rem; min-height: 1.2em; margin: 0; }

/* ── 頂列 ── */
.topbar {
  display: flex; align-items: center; gap: 16px; flex-wrap: wrap;
  padding: 10px 18px; background: var(--card); border-bottom: 1px solid var(--line);
  position: sticky; top: 0; z-index: 20;
}
.brand { font-weight: 700; }
.tabs { display: flex; gap: 4px; flex: 1; flex-wrap: wrap; }
.tab {
  padding: .45em .8em; border: 0; background: transparent; color: var(--ink-soft);
  font: inherit; cursor: pointer; border-radius: 7px;
}
.tab:hover { background: var(--bg); }
.tab.active { background: var(--brand); color: var(--brand-ink); }
.me { display: flex; align-items: center; gap: 8px; }
.me-name { font-size: .9rem; color: var(--ink-soft); }
.avatar { width: 26px; height: 26px; border-radius: 50%; object-fit: cover; }

/* ── 版面 ── */
main { padding: 18px; max-width: 1100px; margin: 0 auto; }
.panel { display: none; }
.panel.active { display: block; }
.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
@media (max-width: 820px) { .grid2 { grid-template-columns: 1fr; } }
.card {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  box-shadow: var(--shadow); padding: 18px;
}

/* ── 表單 ── */
.form { display: flex; flex-direction: column; gap: 12px; }
.form.inline { flex-direction: row; flex-wrap: wrap; align-items: center; }
.form label { display: flex; flex-direction: column; gap: 4px; font-size: .85rem; color: var(--ink-soft); }
.row2 { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
@media (max-width: 560px) { .row2 { grid-template-columns: 1fr; } }
.row { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; }
input, select, textarea {
  font: inherit; color: var(--ink); background: var(--card);
  border: 1px solid var(--line); border-radius: 8px; padding: .5em .6em; width: 100%;
}
input:focus, select:focus, textarea:focus { outline: 2px solid color-mix(in srgb, var(--brand) 45%, transparent); outline-offset: 0; }
textarea { resize: vertical; }
.field-hint { font-size: .8rem; color: var(--ink-soft); font-weight: 400; }

/* ── 工具列 ── */
.toolbar { display: flex; gap: 12px; align-items: center; flex-wrap: wrap; margin-bottom: 14px; }
.toolbar input[type="search"] { max-width: 280px; }
.toolbar select { width: auto; min-width: 200px; }
.chk { display: flex; align-items: center; gap: 6px; font-size: .9rem; color: var(--ink-soft); }
.chk input { width: auto; }

/* ── 表格 ── */
.table-wrap { overflow-x: auto; }
table.grid { width: 100%; border-collapse: collapse; font-size: .9rem; }
table.grid th, table.grid td { padding: .55em .7em; text-align: left; border-bottom: 1px solid var(--line); }
table.grid th { color: var(--ink-soft); font-weight: 600; white-space: nowrap; }
table.grid td.num, table.grid th.num { text-align: right; font-variant-numeric: tabular-nums; }
table.grid tbody tr:hover { background: var(--bg); }
tr.clickable { cursor: pointer; }

.pill { display: inline-block; padding: .1em .55em; border-radius: 999px; font-size: .78rem; border: 1px solid var(--line); }
.pill.recharge { color: var(--ok); border-color: color-mix(in srgb, var(--ok) 40%, var(--line)); }
.pill.adjust { color: var(--warn); border-color: color-mix(in srgb, var(--warn) 40%, var(--line)); }
.pill.consume { color: var(--ink-soft); }
.pos { color: var(--ok); }
.neg { color: var(--danger); }
.soon { color: var(--danger); font-weight: 600; }
.muted { color: var(--ink-soft); }

/* ── 清單 ── */
.list { display: flex; flex-direction: column; gap: 8px; }
.item {
  border: 1px solid var(--line); border-radius: 8px; padding: 10px 12px;
  display: flex; justify-content: space-between; gap: 10px; align-items: flex-start;
}
.item .meta { font-size: .8rem; color: var(--ink-soft); }
.item .grow { flex: 1; min-width: 0; }
.item strong { font-weight: 600; }
.item .acts { display: flex; gap: 6px; flex-shrink: 0; }
.empty { color: var(--ink-soft); font-size: .9rem; padding: 8px 0; }

/* ── 抽屜 ── */
.drawer {
  background: var(--card); width: min(760px, 100%); min-height: 100%;
  margin-left: auto; box-shadow: var(--shadow); display: flex; flex-direction: column;
}
.overlay:has(.drawer) { padding: 0; align-items: stretch; justify-content: flex-end; }
.drawer-head {
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 18px; border-bottom: 1px solid var(--line); position: sticky; top: 0; background: var(--card);
}
.drawer-body { padding: 18px; display: flex; flex-direction: column; gap: 22px; overflow-y: auto; }
.d-section { border-bottom: 1px solid var(--line); padding-bottom: 18px; }
.d-section:last-child { border-bottom: 0; }

.balance-box { display: flex; align-items: baseline; gap: 12px; }
.balance-label { color: var(--ink-soft); font-size: .9rem; }
.balance-num { font-size: 2rem; font-weight: 700; font-variant-numeric: tabular-nums; }

/* ── toast ── */
.toast {
  position: fixed; left: 50%; bottom: 24px; transform: translateX(-50%) translateY(20px);
  background: #1d2530; color: #fff; padding: .7em 1.1em; border-radius: 8px;
  opacity: 0; pointer-events: none; transition: .25s; z-index: 80; max-width: 90vw;
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }
.toast.error { background: var(--danger); }