:root{--bg:#f4f7fb;--panel:#fff;--text:#172033;--muted:#6c7689;--line:#dfe5ee;--primary:#2457d6;--primary2:#173e9e;--danger:#c43a3a;--good:#147a52;--shadow:0 8px 30px rgba(25,40,75,.07)}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font:14px/1.45 Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif}.app-shell{max-width:1500px;margin:0 auto;padding:24px}.topbar{display:flex;justify-content:space-between;gap:20px;align-items:flex-end;margin-bottom:18px}.topbar h1{margin:3px 0 2px;font-size:32px;letter-spacing:-.03em}.eyebrow{font-size:11px;font-weight:800;letter-spacing:.15em;color:var(--primary)}.sub,.muted{color:var(--muted)}.top-actions,.inline,.period-actions,.inline-form,.actions{display:flex;gap:10px;align-items:center}.compact-field{min-width:260px}.compact-field label{display:block;font-size:11px;color:var(--muted);margin-bottom:4px}.panel,.stat{background:var(--panel);border:1px solid var(--line);border-radius:14px;box-shadow:var(--shadow)}.panel{padding:18px;margin-bottom:16px}.period-strip{display:flex;justify-content:space-between;align-items:center;gap:18px}.period-dates{display:flex;gap:30px;flex-wrap:wrap}.period-dates div{display:flex;flex-direction:column;gap:3px}.period-dates span{font-size:11px;text-transform:uppercase;color:var(--muted);font-weight:700}.status-open{color:var(--good)}.status-closed{color:var(--danger)}.stats-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:12px;margin-bottom:16px}.stat{padding:16px}.stat span{display:block;color:var(--muted);font-size:12px;margin-bottom:5px}.stat strong{font-size:21px}.action-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(320px,1fr));gap:14px}.form-card{padding:4px}.form-card h3{margin:0 0 12px}.form-row{display:grid;gap:12px}.form-row.two{grid-template-columns:1fr 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9px;font-size:12px}.full{width:100%;margin-top:8px}.table-wrap{width:100%;overflow:auto;border:1px solid var(--line);border-radius:10px}.spaced{margin-top:16px}table{width:100%;border-collapse:collapse;min-width:820px}th,td{padding:10px 11px;border-bottom:1px solid #e8edf4;text-align:left;vertical-align:middle}th{font-size:11px;text-transform:uppercase;letter-spacing:.04em;color:#637087;background:#f8fafd;position:sticky;top:0}tbody tr:last-child td{border-bottom:0}.num{text-align:right;white-space:nowrap}.strong{font-weight:800}.nowrap{white-space:nowrap}.money-input{min-width:105px}.pill{display:inline-flex;border-radius:999px;padding:4px 8px;background:#eef2f7;color:#5f6b7f;font-size:11px;font-weight:800}.pill.good{background:#e9f7f0;color:var(--good)}.pill.bad{background:#fff0f0;color:var(--danger)}.empty{text-align:center;color:var(--muted);padding:22px}.member-add{max-width:520px;margin-bottom:12px}.member-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px}.member-card{border:1px solid var(--line);border-radius:10px;padding:10px;display:flex;gap:8px;align-items:center}.member-form{display:flex;gap:8px;flex:1}.expense-form{display:grid;grid-template-columns:170px 1fr 170px 220px;gap:12px;align-items:end}.expense-form .wide{min-width:240px}.wide-all{grid-column:1/-1}.participants label:first-child{display:block;margin-bottom:7px}.check-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:8px}.check{display:flex;align-items:center;gap:7px;border:1px solid var(--line);border-radius:8px;padding:8px;background:#fafbfc}.check input{width:auto}.settlement-list{display:grid;gap:8px}.settlement-row{display:grid;grid-template-columns:1fr auto 1fr auto;gap:10px;align-items:center;border:1px solid var(--line);border-radius:10px;padding:10px 12px}.settlement-row .amount{font-weight:800;color:var(--primary)}.flash-stack{margin-bottom:14px}.flash{padding:11px 13px;border-radius:10px;background:#eaf7ef;color:#176344;border:1px solid #c8ead7;margin-bottom:8px}.flash.error{background:#fff1f1;color:#9f2929;border-color:#efc8c8}.hero-panel{text-align:center;padding:30px}.hero-panel .inline-form{justify-content:center;max-width:520px;margin:15px auto 0}.login-shell{min-height:100vh;display:grid;place-items:center;padding:20px;background:radial-gradient(circle at 20% 20%,#e9efff,transparent 35%),var(--bg)}.login-card{width:min(420px,100%);background:#fff;border:1px solid var(--line);border-radius:18px;box-shadow:var(--shadow);padding:28px}.login-card h1{margin:10px 0 0}.login-card label{display:block;margin:14px 0 5px}.brand-mark{width:46px;height:46px;border-radius:13px;background:var(--primary);color:#fff;font-weight:900;display:grid;place-items:center;font-size:17px}footer{display:flex;gap:16px;justify-content:center;padding:14px;color:var(--muted)}footer a{color:var(--primary);text-decoration:none}@media(max-width:900px){.app-shell{padding:12px}.topbar,.period-strip{align-items:stretch;flex-direction:column}.stats-grid{grid-template-columns:1fr 1fr}.action-grid{grid-template-columns:1fr}.member-grid{grid-template-columns:1fr 1fr}.expense-form{grid-template-columns:1fr 1fr}.check-grid{grid-template-columns:1fr 1fr}.compact-field{min-width:0}.settlement-row{grid-template-columns:1fr auto 1fr}.settlement-row .amount{grid-column:1/-1;text-align:right}}@media(max-width:560px){.stats-grid,.member-grid,.expense-form,.form-row.two{grid-template-columns:1fr}.check-grid{grid-template-columns:1fr}.top-actions,.inline-form{align-items:stretch;flex-direction:column}.settlement-row{grid-template-columns:1fr}.period-dates{gap:14px}}

.collapsible-summary{cursor:pointer;list-style:none;margin-bottom:0;user-select:none}.collapsible-summary::-webkit-details-marker{display:none}.collapsible-panel[open]>.collapsible-summary{margin-bottom:14px}.collapse-control{display:inline-flex;align-items:center;justify-content:center;min-width:76px;border:1px solid #cfd7e5;border-radius:8px;padding:7px 10px;background:#fff;color:var(--primary);font-size:12px;font-weight:800}.collapsible-panel .when-open{display:none}.collapsible-panel[open] .when-open{display:inline}.collapsible-panel[open] .when-closed{display:none}