:root{--bg: #fafafa;--surface: #ffffff;--surface-hover: #f4f4f5;--border: #e4e4e7;--text: #18181b;--text-muted: #71717a;--text-faint: #a1a1aa;--accent: #4f46e5;--accent-hover: #4338ca;--accent-soft: #eef2ff;--danger: #dc2626;--danger-soft: #fef2f2;--radius-sm: 6px;--radius-md: 10px;--radius-lg: 16px;--shadow-sm: 0 1px 2px rgba(24, 24, 27, .04);--shadow-md: 0 8px 24px rgba(24, 24, 27, .08)}@media (prefers-color-scheme: dark){:root{--bg: #0c0c0f;--surface: #18181b;--surface-hover: #202024;--border: #2b2b30;--text: #f4f4f5;--text-muted: #a1a1aa;--text-faint: #6b6b71;--accent: #818cf8;--accent-hover: #a5b4fc;--accent-soft: #1e1b3a;--danger: #f87171;--danger-soft: #2c1616;--shadow-sm: 0 1px 2px rgba(0, 0, 0, .4);--shadow-md: 0 8px 24px rgba(0, 0, 0, .5)}}*{box-sizing:border-box}body{margin:0;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif;background:var(--bg);color:var(--text);-webkit-font-smoothing:antialiased}h1,h2,h3,h4{margin:0 0 4px;font-weight:600;letter-spacing:-.01em}h2{font-size:17px}h3{font-size:14px;color:var(--text-muted);text-transform:uppercase;letter-spacing:.04em;margin-top:20px}p{margin:0 0 8px}a{color:var(--accent);text-decoration:none;font-weight:500}a:hover{text-decoration:underline}header{position:sticky;top:0;z-index:10;display:flex;align-items:center;justify-content:space-between;padding:14px 20px;background:var(--surface);border-bottom:1px solid var(--border)}header a{color:var(--text);font-weight:700;font-size:16px}.brand{display:flex;align-items:center;gap:8px}.brand-dot{width:9px;height:9px;border-radius:50%;background:var(--accent)}.header-user{display:flex;align-items:center;gap:10px;font-size:14px;color:var(--text-muted)}.avatar{width:26px;height:26px;border-radius:50%;background:var(--accent-soft);color:var(--accent);display:flex;align-items:center;justify-content:center;font-size:12px;font-weight:700}.container{padding:24px 20px 64px;max-width:640px;margin:0 auto}.auth-page{min-height:calc(100vh - 58px);display:flex;align-items:center;justify-content:center;padding:24px}.card,section{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-lg);padding:20px;margin-bottom:16px;box-shadow:var(--shadow-sm)}.auth-page .card{width:100%;max-width:380px;margin-bottom:0;box-shadow:var(--shadow-md)}form{display:flex;flex-direction:column}label{font-size:13px;font-weight:500;color:var(--text-muted);margin:10px 0 4px}label:first-child{margin-top:0}input[type=text],input[type=number],input[type=email],input[type=password],input[type=date],select{width:100%;padding:10px 12px;margin:0 0 4px;border:1px solid var(--border);border-radius:var(--radius-sm);background:var(--surface);color:var(--text);font-size:14px;font-family:inherit;transition:border-color .15s}input::placeholder{color:var(--text-faint)}input:focus,select:focus{outline:none;border-color:var(--accent)}button{background:var(--surface);color:var(--text);border:1px solid var(--border);border-radius:var(--radius-sm);padding:9px 14px;margin-top:8px;font-size:14px;font-family:inherit;font-weight:500;cursor:pointer;transition:background-color .15s,border-color .15s,color .15s}button:hover{background:var(--surface-hover)}form>button[type=submit]{background:var(--accent);border-color:var(--accent);color:#fff;margin-top:14px}form>button[type=submit]:hover{background:var(--accent-hover);border-color:var(--accent-hover)}form>button[type=submit]:disabled{opacity:.6;cursor:default}button.google-btn{width:100%;margin-top:10px;display:flex;align-items:center;justify-content:center;gap:8px}.header-user button{padding:6px 10px;font-size:13px;color:var(--text-muted)}ul{list-style:none;padding-left:0;margin:0}li{padding:10px 0;border-bottom:1px solid var(--border)}li:last-child{border-bottom:none}.session-item,.participant-item{display:flex;align-items:center;justify-content:space-between;gap:12px}.session-item a{font-weight:600;color:var(--text)}.session-item .meta{font-size:12px;color:var(--text-faint);font-weight:400;display:block}.session-item button,.participant-item button{margin:0;color:var(--text-faint);border-color:transparent;background:transparent;font-size:13px}.session-item button:hover,.participant-item button:hover{color:var(--danger);background:var(--danger-soft);border-color:var(--danger-soft)}.menu-item,.transaction-item{border:1px solid var(--border);border-radius:var(--radius-md);padding:12px 14px;margin-bottom:10px;background:var(--bg)}.transaction-item .totals{margin-top:10px;padding-top:10px;border-top:1px dashed var(--border);font-size:13px}.transaction-item .totals .final{font-size:15px;font-weight:700;color:var(--accent)}.transaction-item .transaction-actions{margin-top:10px;color:var(--danger);border-color:var(--danger-soft);background:var(--danger-soft);font-size:13px}.sharing-header{display:flex;align-items:center;justify-content:space-between;margin-top:10px}.select-all-btn{margin:0;padding:3px 10px;font-size:12px;color:var(--accent);border-color:var(--accent-soft);background:var(--accent-soft)}.select-all-btn:hover{background:var(--accent);border-color:var(--accent);color:#fff}.checkbox-group{display:flex;flex-wrap:wrap;gap:6px;margin:6px 0 4px}.checkbox-group label{display:inline-flex;align-items:center;gap:5px;margin:0;padding:6px 12px;border:1px solid var(--border);border-radius:999px;font-size:13px;font-weight:500;color:var(--text-muted);background:var(--surface);cursor:pointer;-webkit-user-select:none;user-select:none;transition:background-color .15s,border-color .15s,color .15s}.checkbox-group label:hover{border-color:var(--accent);color:var(--text)}.checkbox-group label:has(input:checked){background:var(--accent);border-color:var(--accent);color:#fff}.checkbox-group input[type=checkbox]{position:absolute;width:1px;height:1px;opacity:0;pointer-events:none}.summary-table,table.settlement{width:100%;border-collapse:collapse;margin-top:8px}.summary-table th,.summary-table td{padding:10px 8px;text-align:left;font-size:13px;border-bottom:1px solid var(--border)}.summary-table th{color:var(--text-muted);font-weight:500;font-size:12px;text-transform:uppercase;letter-spacing:.03em}.settlement-row{display:flex;align-items:center;gap:10px;padding:12px 0;border-bottom:1px solid var(--border);font-size:14px}.settlement-row:last-child{border-bottom:none}.settlement-row .names{flex:1;display:flex;align-items:center;gap:8px}.settlement-row .arrow{color:var(--text-faint)}.settlement-row .amount{font-weight:700;color:var(--accent)}.tabs{display:flex;gap:2px;padding:3px;margin-bottom:16px;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-md)}.tabs button{flex:1;margin:0;border:none;border-radius:calc(var(--radius-md) - 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