:root{--bg: #0f1220;--card: #1a1f35;--card2: #232a45;--text: #eef1f8;--muted: #9aa4c4;--primary: #6c5ce7;--primary-d: #5a4bd4;--pos: #4ade80;--neg: #fb7185;--line: #2c3355;--radius: 14px}*{box-sizing:border-box}body{margin:0;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;background:var(--bg);color:var(--text)}footer{margin:0;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;background:var(--bg);font-size:.5rem;text-align:center;color:gray}a{color:inherit;text-decoration:none}h1,h2,h3{margin:.2em 0 .5em}.container{max-width:720px;margin:0 auto;padding:16px}.center{min-height:70vh;display:flex;align-items:center;justify-content:center;flex-direction:column}.muted{color:var(--muted)}.small{font-size:.85rem}.strong{font-weight:600}.mb{margin-bottom:10px}.pos{color:var(--pos);font-weight:600}.neg{color:var(--neg);font-weight:600}.nav{display:flex;align-items:center;justify-content:space-between;padding:12px 20px;background:var(--card);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:10}.brand{font-weight:700;font-size:1.1rem}.nav-right{display:flex;align-items:center;gap:14px}.nav-link{color:var(--muted)}.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:16px;margin:12px 0;display:flex;flex-direction:column;gap:10px}.login{width:340px;max-width:90vw}label{display:flex;flex-direction:column;gap:6px;font-size:.9rem;color:var(--muted)}input,select{background:var(--card2);border:1px solid var(--line);color:var(--text);padding:10px 12px;border-radius:10px;font-size:1rem;width:100%}input:focus,select:focus{outline:2px solid var(--primary);border-color:transparent}.checkbox{flex-direction:row;align-items:center;gap:8px}.checkbox input,.split-check input{width:auto}.grid2{display:grid;grid-template-columns:1fr 1fr;gap:12px}.btn{background:var(--card2);color:var(--text);border:1px solid var(--line);padding:10px 16px;border-radius:10px;font-size:.95rem;cursor:pointer}.btn:hover{border-color:var(--primary)}.btn.primary{background:var(--primary);border-color:var(--primary)}.btn.primary:hover{background:var(--primary-d)}.btn.primary:disabled{opacity:.5;cursor:not-allowed}.btn.ghost{background:transparent}.btn.tiny{padding:5px 10px;font-size:.8rem}.row-between{display:flex;align-items:center;justify-content:space-between;gap:12px}.list{display:flex;flex-direction:column}.list-item{flex-direction:row;align-items:center;justify-content:space-between}.list-item:hover{border-color:var(--primary)}.arrow{font-size:1.5rem;color:var(--muted)}.chips{display:flex;flex-wrap:wrap;gap:8px}.chip{background:var(--card2);border:1px solid var(--line);color:var(--muted);padding:7px 14px;border-radius:999px;cursor:pointer;font-size:.9rem}.chip.on{background:var(--primary);border-color:var(--primary);color:#fff}.error{background:#3b1622;border:1px solid var(--neg);color:#ffd7de;padding:10px 12px;border-radius:10px}.ok-msg{background:#12331f;border:1px solid var(--pos);color:#c9ffdd;padding:10px 12px;border-radius:10px}.expense{flex-direction:row;align-items:center;justify-content:space-between}.expense-main{flex:1}.expense-right{text-align:right;display:flex;flex-direction:column;gap:6px;align-items:flex-end}.amount{font-weight:700;font-size:1.1rem}.expense-actions{display:flex;gap:6px}.tabs{display:flex;gap:6px;margin:8px 0}.tabs button{flex:1;background:var(--card);border:1px solid var(--line);color:var(--muted);padding:10px;border-radius:10px;cursor:pointer}.tabs button.on{background:var(--primary);border-color:var(--primary);color:#fff}.bal-row,.settle-row{display:flex;align-items:center;justify-content:space-between;padding:8px 0;border-bottom:1px solid var(--line)}.bal-row:last-child,.settle-row:last-child{border-bottom:none}.settle-row{gap:10px}.arrow-r{color:var(--primary);font-weight:700}.settle-amt{margin-left:auto;font-weight:700}.add-member{display:flex;gap:8px;margin-top:10px}.badge{background:var(--primary);color:#fff;font-size:.7rem;padding:2px 8px;border-radius:999px}.badge.warn{background:transparent;border:1px solid var(--neg);color:var(--neg)}.penalty-counts{display:flex;gap:16px;font-weight:600}.link{color:var(--primary);text-decoration:underline;cursor:pointer}.center-text{text-align:center}.modal-backdrop{position:fixed;top:0;right:0;bottom:0;left:0;background:#0009;display:flex;align-items:flex-start;justify-content:center;padding:20px;overflow:auto;z-index:50}.modal{width:480px;max-width:100%;margin-top:4vh}.split-list{display:flex;flex-direction:column;gap:4px;border:1px solid var(--line);border-radius:10px;padding:8px}.split-row{display:flex;align-items:center;gap:10px;padding:6px 4px}.split-row.off{opacity:.45}.split-check{flex-direction:row;align-items:center;gap:8px;flex:1;color:var(--text)}.split-input{width:90px;padding:6px 8px}.split-amt{width:80px;text-align:right;color:var(--muted)}.sum-line{font-size:.9rem;padding:8px;border-radius:8px;text-align:center}.sum-line.ok{background:#12331f;color:var(--pos)}.sum-line.bad{background:#3b1622;color:var(--neg)}@media (max-width: 640px){.container{padding:12px}.nav{padding:10px 14px;flex-wrap:wrap;gap:8px}.nav-right{gap:10px}.grid2{grid-template-columns:1fr}.modal{margin-top:0}.modal-backdrop{padding:0;align-items:stretch}.modal-backdrop .modal{width:100%;max-width:100%;height:100%;border-radius:0;overflow-y:auto}.split-row{flex-wrap:wrap}.split-check{min-width:100%}.split-input{width:100px}.split-amt{width:auto;margin-left:auto}.expense{flex-wrap:wrap}.expense-right{align-items:flex-start;text-align:left;width:100%}.expense-actions{width:100%}.expense-actions .btn{flex:1}.add-member{flex-direction:column;align-items:stretch}.tabs,.row-between{flex-wrap:wrap}.btn{padding:10px 14px}input,select,.btn{font-size:16px}}