:root{--bg:#f4f7fb;--card:#fff;--text:#172033;--muted:#687386;--line:#e4e9f0;--brand:#2563eb;--brand2:#1d4ed8;--good:#15803d;--bad:#b91c1c;--warn:#b45309;--shadow:0 8px 26px rgba(15,23,42,.07)}
*{box-sizing:border-box}body{margin:0;font-family:Inter,"Noto Sans TC","Microsoft JhengHei",system-ui,sans-serif;background:var(--bg);color:var(--text)}a{color:inherit}
.container{max-width:1180px;margin:auto;padding:22px}.topbar{display:flex;justify-content:space-between;align-items:flex-start;gap:16px;margin-bottom:18px}.brand h1{margin:0;font-size:28px}.brand p{margin:5px 0 0;color:var(--muted)}.actions{display:flex;gap:8px;flex-wrap:wrap}
button,.btn{border:0;border-radius:10px;padding:10px 14px;font-weight:750;cursor:pointer;text-decoration:none;display:inline-flex;align-items:center;justify-content:center}.primary{background:var(--brand);color:white}.primary:hover{background:var(--brand2)}.secondary{background:#eaf0ff;color:#1d4ed8}.ghost{background:#edf1f6;color:#334155}.danger{background:#fee2e2;color:#991b1b}
.card{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:18px;box-shadow:var(--shadow)}.grid{display:grid;grid-template-columns:1fr 1fr;gap:16px}.full{grid-column:1/-1}.trip-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}.trip-card{background:white;border:1px solid var(--line);border-radius:15px;padding:16px;box-shadow:var(--shadow)}.trip-card h3{margin:0 0 8px}.meta{font-size:13px;color:var(--muted);display:flex;gap:12px;flex-wrap:wrap}.trip-bottom{display:flex;justify-content:space-between;align-items:end;margin-top:16px;gap:12px}.money{font-size:22px;font-weight:850}.badge{font-size:12px;padding:5px 8px;border-radius:999px;background:#eef2ff;color:#3730a3;font-weight:750}.badge.archived{background:#f1f5f9;color:#64748b}.badge.ended{background:#fff7ed;color:#9a3412}
.kpis{display:grid;grid-template-columns:repeat(5,1fr);gap:12px;margin:14px 0}.kpi{background:white;border:1px solid var(--line);border-radius:14px;padding:15px}.kpi .l{font-size:12px;color:var(--muted)}.kpi .v{font-size:23px;font-weight:850;margin-top:6px}
h2{font-size:18px;margin:0 0 14px}.section-title{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-bottom:12px}.row{display:grid;grid-template-columns:1fr 1fr;gap:12px}.field{margin-bottom:12px}label{display:block;font-size:13px;font-weight:750;color:#475569;margin-bottom:6px}input,select,textarea{width:100%;padding:10px 12px;border:1px solid #cbd5e1;border-radius:9px;font:inherit;background:white}
.members{display:flex;flex-wrap:wrap;gap:8px}.pill{display:flex;gap:7px;align-items:center;background:#eff6ff;color:#1d4ed8;border:1px solid #bfdbfe;border-radius:999px;padding:7px 10px}.pill button{padding:0;background:transparent;color:#64748b}.split-list{display:grid;gap:8px}.split-item{display:grid;grid-template-columns:28px 1fr 130px;gap:8px;align-items:center}
table{width:100%;border-collapse:collapse}th,td{padding:10px 8px;border-bottom:1px solid var(--line);font-size:14px;text-align:left;vertical-align:top}th{font-size:12px;color:#64748b}.right{text-align:right}.good{color:var(--good);font-weight:800}.bad{color:var(--bad);font-weight:800}.muted{color:var(--muted)}.small{font-size:12px}.settlement{display:flex;justify-content:space-between;border-bottom:1px solid var(--line);padding:11px 0}.settlement:last-child{border-bottom:0}
.log-list{display:grid;gap:8px;max-height:400px;overflow:auto}.log-item{display:grid;grid-template-columns:155px 110px 100px 1fr 78px;gap:10px;border:1px solid var(--line);border-radius:10px;padding:10px;background:#fafafa}.empty{color:var(--muted);padding:12px 0}.notice{padding:12px 14px;border-radius:10px;background:#fff7ed;color:#9a3412;margin-bottom:14px}.admin-grid{display:grid;grid-template-columns:repeat(6,1fr);gap:12px}.admin-kpi{background:white;border:1px solid var(--line);border-radius:12px;padding:14px}.admin-kpi b{font-size:22px}.login{max-width:420px;margin:10vh auto}.hidden{display:none!important}.actor-box{display:flex;align-items:center;gap:7px}.actor-box input{width:130px;padding:8px 10px}
@media(max-width:850px){.grid,.row,.trip-grid,.kpis,.admin-grid{grid-template-columns:1fr}.topbar{flex-direction:column}.split-item{grid-template-columns:28px 1fr 95px}.log-item{grid-template-columns:1fr}.full{grid-column:auto}.actor-box input{width:150px}}

button:disabled,.btn:disabled{opacity:.45;cursor:not-allowed;filter:grayscale(.25)}

/* V4.3 collapsible sections */
.collapsible{padding:0;overflow:hidden}
.collapsible summary{
  list-style:none;
  cursor:pointer;
  padding:18px;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:12px;
  font-size:18px;
  font-weight:800;
  user-select:none;
}
.collapsible summary::-webkit-details-marker{display:none}
.collapsible summary::after{
  content:"＋";
  flex:0 0 auto;
  font-size:22px;
  color:var(--muted);
  line-height:1;
}
.collapsible[open] summary::after{content:"－"}
.collapsible[open] summary{border-bottom:1px solid var(--line)}
.collapsible-body{padding:18px}
.summary-hint{font-size:12px;font-weight:600;color:var(--muted);margin-left:auto}
.summary-preview{font-size:12px;font-weight:650;color:var(--muted);margin-left:auto;text-align:right}
.compact-kpis{margin:0}
@media(max-width:850px){
  .summary-preview{max-width:58%;white-space:normal}
  .collapsible summary{padding:16px}
  .collapsible-body{padding:16px}
}