:root {
    --bg: #f5f6f8;
    --card: #ffffff;
    --text: #1d2129;
    --muted: #6b7280;
    --line: #e5e7eb;
    --accent: #2563eb;
    --accent-text: #ffffff;
    --ok: #15803d;
    --ok-bg: #dcfce7;
    --warn: #b45309;
    --warn-bg: #fef3c7;
    --err: #b91c1c;
    --err-bg: #fee2e2;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg: #111318;
        --card: #1a1d24;
        --text: #e5e7eb;
        --muted: #9ca3af;
        --line: #2b303b;
        --accent: #3b82f6;
        --ok: #4ade80;
        --ok-bg: #12321f;
        --warn: #fbbf24;
        --warn-bg: #3a2c0b;
        --err: #f87171;
        --err-bg: #3b1515;
    }
}

* { box-sizing: border-box; }

body {
    margin: 0;
    background: var(--bg);
    color: var(--text);
    font: 15px/1.6 system-ui, -apple-system, "Segoe UI", "PingFang TC", "Microsoft JhengHei", sans-serif;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.wrap { max-width: 960px; margin: 0 auto; padding: 0 16px; }

.top { background: var(--card); border-bottom: 1px solid var(--line); margin-bottom: 20px; }
.top .wrap { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 20px; min-height: 56px; }
.brand { font-weight: 700; font-size: 17px; color: var(--text); }
.top nav { display: flex; flex-wrap: wrap; gap: 4px 16px; align-items: center; }

h1 { font-size: 22px; margin: 0 0 12px; }
h2 { font-size: 18px; margin: 24px 0 10px; }

.card {
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: 10px;
    padding: 18px;
    margin-bottom: 16px;
}

.grid { display: grid; gap: 16px; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); }
.product h3 { margin: 0 0 6px; font-size: 18px; }
.product .desc { color: var(--muted); white-space: pre-line; min-height: 2.4em; }
.price { font-size: 20px; font-weight: 700; margin: 10px 0; }
.price small { font-size: 14px; font-weight: 400; color: var(--muted); }
.muted { color: var(--muted); }
.small { font-size: 13px; }

label { display: block; font-weight: 600; margin: 12px 0 4px; }
input[type=text], input[type=email], input[type=password], input[type=number], select, textarea {
    width: 100%;
    padding: 9px 11px;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: var(--bg);
    color: var(--text);
    font: inherit;
}
textarea { min-height: 90px; }

.choices { display: grid; gap: 8px; }
.choice {
    display: flex; align-items: center; gap: 10px;
    border: 1px solid var(--line); border-radius: 8px; padding: 10px 12px;
    font-weight: 400; margin: 0; cursor: pointer;
}
.choice:has(input:checked) { border-color: var(--accent); outline: 1px solid var(--accent); }

.btn, button {
    display: inline-block;
    padding: 9px 18px;
    border: 0;
    border-radius: 8px;
    background: var(--accent);
    color: var(--accent-text);
    font: inherit;
    font-weight: 600;
    cursor: pointer;
}
.btn:hover { text-decoration: none; filter: brightness(1.08); }
.btn.block, button.block { display: block; width: 100%; text-align: center; margin-top: 16px; }
.btn.ghost, button.ghost { background: transparent; color: var(--accent); border: 1px solid var(--line); }
.btn.danger, button.danger { background: var(--err); }
.btn.sm, button.sm { padding: 4px 10px; font-size: 13px; }
button.link { background: none; color: var(--accent); padding: 0; font-weight: 400; }
form.inline { display: inline; }

.flash { background: var(--ok-bg); color: var(--ok); padding: 10px 14px; border-radius: 8px; margin-bottom: 16px; }
.flash.err { background: var(--err-bg); color: var(--err); }

.badge { display: inline-block; padding: 1px 8px; border-radius: 99px; font-size: 12px; font-weight: 600; background: var(--line); color: var(--text); }
.badge.ok { background: var(--ok-bg); color: var(--ok); }
.badge.warn { background: var(--warn-bg); color: var(--warn); }
.badge.err { background: var(--err-bg); color: var(--err); }

.kv { display: grid; grid-template-columns: 7em 1fr; gap: 6px 12px; margin: 0; }
.kv dt { color: var(--muted); }
.kv dd { margin: 0; word-break: break-all; }

.key {
    font: 600 20px/1.4 ui-monospace, Consolas, monospace;
    letter-spacing: 1px;
    background: var(--bg);
    border: 1px dashed var(--accent);
    border-radius: 8px;
    padding: 14px;
    text-align: center;
    word-break: break-all;
    user-select: all;
}

.qr { display: block; max-width: 260px; width: 100%; margin: 12px auto; border-radius: 8px; background: #fff; padding: 8px; }
.amount { font-size: 28px; font-weight: 700; text-align: center; color: var(--err); }

.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; background: var(--card); }
th, td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--line); vertical-align: top; white-space: nowrap; }
th { color: var(--muted); font-weight: 600; font-size: 13px; }
td.wrap-text { white-space: normal; }
.mono { font-family: ui-monospace, Consolas, monospace; }

.row { display: flex; flex-wrap: wrap; gap: 8px; align-items: end; }
.row > * { flex: 1 1 140px; }
.row > .shrink { flex: 0 0 auto; }

.stats { display: grid; gap: 12px; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); margin-bottom: 16px; }
.stat { background: var(--card); border: 1px solid var(--line); border-radius: 10px; padding: 12px 14px; }
.stat b { display: block; font-size: 22px; }