:root{color-scheme:light dark;font-family:system-ui,-apple-system,"Noto Sans TC",sans-serif;font-size:16px;line-height:1.5;--bg:#f5f7f5;--surface:#fff;--text:#1a2924;--muted:#607168;--border:#dce5df;--accent:#215c49;--accent-text:#fff;--positive:#17734c;--blue:#245eae;--focus:#94c5b2}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--text)}
.wrap{width:min(1120px,calc(100% - 32px));margin-inline:auto}
.site-header{background:var(--surface);border-bottom:1px solid var(--border);padding:16px 0 18px;margin-bottom:32px}
.header-row,.section-heading,.account,.actions,.auth-links{display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap}
.account{justify-content:flex-end;color:var(--muted);font-size:.9rem;overflow-wrap:anywhere}
h1,h2,h3,p{margin-top:0}h1{font-size:1.65rem;margin-bottom:0;letter-spacing:-.02em}h2{font-size:1.3rem;margin-bottom:16px}h3{font-size:1rem;margin-bottom:4px}
.eyebrow{color:var(--accent);font-size:.72rem;font-weight:800;letter-spacing:.12em;margin-bottom:2px}
.muted{color:var(--muted)}.small{font-size:.85rem}.section{margin-bottom:28px}.section-heading{margin-bottom:16px}.section-heading h2{margin-bottom:0}
.panel,.totals{background:var(--surface);border:1px solid var(--border);border-radius:12px;padding:20px}
.notice{background:#e7f1eb;color:#184d39;border:1px solid #b6d8c2;border-radius:8px;padding:10px 14px;margin-bottom:20px}.notice.error{background:#fff0f0;color:#942c36;border-color:#e9b9be}
.auth-panel{max-width:440px;margin:60px auto}.auth-panel .button.primary{width:100%}.auth-links{justify-content:flex-start;margin-top:14px}
.field{display:flex;flex-direction:column;gap:5px;margin-bottom:14px}label{font-size:.9rem;font-weight:650}input,select{width:100%;font:inherit;color:var(--text);background:var(--surface);border:1px solid var(--border);border-radius:7px;min-height:42px;padding:8px 10px}input:focus,select:focus,button:focus-visible,a:focus-visible,summary:focus-visible{outline:3px solid var(--focus);outline-offset:2px}
button{font:inherit;cursor:pointer}.button{display:inline-flex;align-items:center;justify-content:center;min-height:40px;padding:7px 13px;border-radius:7px;border:1px solid var(--border);background:var(--surface);color:var(--text);font-weight:650;white-space:nowrap}.button:hover{border-color:var(--accent)}.button.primary{background:var(--accent);border-color:var(--accent);color:var(--accent-text)}.button.primary:hover{filter:brightness(1.12)}.button:disabled{opacity:.55;cursor:wait}.text-button{border:0;background:none;color:var(--accent);text-decoration:underline;padding:6px 0}
.positive{color:var(--positive)}.blue{color:var(--blue)}
.totals{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px;margin-bottom:20px;font-size:.95rem}
.total-group{display:flex;align-items:baseline;gap:8px;flex-wrap:wrap;min-width:0;overflow-wrap:anywhere}.totals strong{font-size:1.1rem;font-variant-numeric:tabular-nums}
.content-grid{display:grid;grid-template-columns:minmax(0,1fr);gap:18px;margin-bottom:30px}.form-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.form-grid .field{min-width:0}
details summary{cursor:pointer;font-size:1.3rem;font-weight:700;list-style:none}details summary::-webkit-details-marker{display:none}details summary::after{content:'＋';float:right;color:var(--accent)}details[open] summary::after{content:'−'}details summary .summary-hint{display:block;font-size:.82rem;font-weight:400}.person-add{padding:20px 0;border-bottom:1px solid var(--border)}.person-row{display:flex;align-items:center;justify-content:space-between;gap:10px;padding:13px 0;border-bottom:1px solid var(--border)}.person-row:last-child{border-bottom:0}.person-row .actions{justify-content:flex-end}.person-row .button{font-size:.83rem;min-height:34px}.person-row .muted{font-size:.83rem;margin:0;overflow-wrap:anywhere}
.table-scroll{background:var(--surface);border:1px solid var(--border);border-radius:12px}table{border-collapse:collapse;width:100%;table-layout:fixed}th,td{text-align:left;padding:11px 13px;border-bottom:1px solid var(--border);vertical-align:top}th{font-size:.79rem;color:var(--muted);font-weight:700;white-space:nowrap}tr:last-child td{border-bottom:0}td{font-size:.9rem;overflow-wrap:anywhere}td.number,th.number{text-align:right;font-variant-numeric:tabular-nums}td.number{white-space:nowrap;overflow-wrap:normal}.row-actions{display:flex;gap:7px}.row-actions .button{min-height:32px;font-size:.78rem;padding:3px 8px}.empty{text-align:center;padding:24px;color:var(--muted)}
[hidden]{display:none!important}
@media(max-width:760px){.site-header{margin-bottom:22px}.content-grid{grid-template-columns:1fr}.section{margin-bottom:24px}.section-heading{align-items:flex-start}.table-scroll{background:transparent;border:0;border-radius:0}table,tbody{display:block;width:100%}thead{display:none}tr{display:block;background:var(--surface);border:1px solid var(--border);border-radius:12px;padding:12px 16px;margin-bottom:12px}td,td.number{display:grid;grid-template-columns:3rem minmax(0,1fr);gap:12px;text-align:left;border:0;padding:5px 0;min-width:0}td.number{white-space:normal;overflow-wrap:anywhere}td::before{content:attr(data-label);color:var(--muted);font-size:.8rem}td.empty{display:block;text-align:center}td.empty::before{content:none}.badge{justify-self:start}.row-actions{flex-wrap:wrap}.row-actions .button{min-height:40px;padding:6px 12px}}
@media(max-width:520px){.form-grid{grid-template-columns:1fr}.panel{padding:16px}.auth-panel{margin:24px auto}.account{width:100%;justify-content:space-between}.totals{grid-template-columns:1fr}.person-row{align-items:flex-start;flex-direction:column}.person-row .actions{justify-content:flex-start}}
@media(prefers-color-scheme:dark){:root{--bg:#121c19;--surface:#1c2924;--text:#eef5ef;--muted:#a9bcb0;--border:#35483e;--accent:#91d3ac;--accent-text:#102b1d;--positive:#85d9aa;--blue:#9dc5ff;--focus:#4f9c75}.notice{background:#1d3d2a;color:#c5f2d0;border-color:#386b49}.notice.error{background:#4a262b;color:#ffccd0;border-color:#835059}}

.direction-field{border:0;padding:0;margin:0 0 16px;min-width:0}
.direction-field legend{font-size:.9rem;font-weight:650;margin-bottom:6px}
.segmented{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px}
.direction-button{min-height:48px;border:1px solid var(--border);border-radius:8px;background:var(--surface);color:var(--text);font-weight:700;padding:10px 8px}
.direction-button[aria-pressed="true"]{border-color:currentColor;background:var(--bg);box-shadow:inset 0 0 0 1px currentColor}
.direction-button[data-direction="they_owe"][aria-pressed="true"]{color:var(--positive)}
.direction-button[data-direction="i_owe"][aria-pressed="true"]{color:var(--blue)}
.direction-button:disabled{opacity:.55;cursor:wait}
.badge{display:inline-block;border:1px solid currentColor;border-radius:6px;padding:2px 6px;font-weight:650;font-size:.8rem;white-space:nowrap}
.transaction-filters{display:grid;grid-template-columns:minmax(0,240px) minmax(0,440px);gap:12px}
@media(max-width:520px){.transaction-filters{grid-template-columns:minmax(0,1fr)}}
.panel,.field,.person-row>div{min-width:0}
#person-list strong,#account-email{overflow-wrap:anywhere}
@media(min-width:761px){th:nth-child(1){width:12%}th:nth-child(2){width:12%}th:nth-child(3){width:13%}th:nth-child(4){width:17%}th:nth-child(5){width:14%}th:nth-child(6){width:17%}th:nth-child(7){width:15%}.row-actions{flex-wrap:wrap}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important}}