:root{
    --bg:#12161d;
    --surface:#1b2129;
    --surface-2:#232b35;
    --line:#2e3742;
    --gold:#c9a227;
    --gold-soft:#8f7620;
    --gold-bg:rgba(201,162,39,0.12);
    --ink:#ece6d6;
    --ink-dim:#9aa2ad;
    --ink-faint:#5f6a76;
    --teal:#3fa08f;
    --teal-bg:rgba(63,160,143,0.13);
    --red:#c1554a;
    --red-bg:rgba(193,85,74,0.14);
    --radius:14px;
  }
  *{box-sizing:border-box; -webkit-tap-highlight-color:transparent;}
  html,body{margin:0;padding:0;}
  body{
    background:var(--bg);
    color:var(--ink);
    font-family:'Vazirmatn',sans-serif;
    min-height:100vh;
    padding-bottom:2rem;
  }
  .num{font-variant-numeric:tabular-nums;}
  .wrap{max-width:480px;margin:0 auto;padding:0 14px;}
  header{
    padding:22px 14px 14px;
    border-bottom:1px solid var(--line);
    position:sticky;top:0;background:var(--bg);z-index:5;
  }
  header .row{display:flex;align-items:center;justify-content:space-between;gap:10px;}
  header h1{font-size:19px;font-weight:600;margin:0;letter-spacing:.2px;}
  header .sub{font-size:12px;color:var(--ink-faint);margin-top:3px;}
  .coin{
    width:34px;height:34px;border-radius:50%;
    border:1.5px solid var(--gold-soft);
    display:flex;align-items:center;justify-content:center;
    font-size:15px;color:var(--gold);flex-shrink:0;
  }
  nav.tabs{
    display:flex;gap:4px;margin-top:14px;
    background:var(--surface);border-radius:12px;padding:4px;
  }
  nav.tabs button{
    flex:1;border:none;background:transparent;color:var(--ink-dim);
    font-family:inherit;font-size:11.5px;padding:9px 2px;border-radius:9px;
    cursor:pointer;transition:background .15s, color .15s;
  }
  nav.tabs button.active{background:var(--gold-bg);color:var(--gold);font-weight:600;}

  section{display:none;padding:16px 0 6px;}
  section.active{display:block;}
  @keyframes slideFromRight{ from{ transform:translateX(22px); opacity:0; } to{ transform:translateX(0); opacity:1; } }
  @keyframes slideFromLeft{ from{ transform:translateX(-22px); opacity:0; } to{ transform:translateX(0); opacity:1; } }
  section.active.anim-from-right{ animation: slideFromRight .24s ease; }
  section.active.anim-from-left{ animation: slideFromLeft .24s ease; }
  section.active{display:block;}

  .card{
    background:var(--surface);border:1px solid var(--line);
    border-radius:var(--radius);padding:14px;margin-bottom:12px;
  }
  .card h2{font-size:14px;font-weight:600;margin:0 0 10px;color:var(--ink);}
  .collapsible-header{
    display:flex;align-items:center;justify-content:space-between;
    cursor:pointer;user-select:none;margin-bottom:0;
  }
  .collapsible-header .chevron{
    color:var(--ink-faint);font-size:16px;transition:transform .15s;flex-shrink:0;
  }
  .collapsible-header.open .chevron{transform:rotate(90deg);color:var(--gold);}
  .collapsible-body{display:none;margin-top:10px;}
  .collapsible-body.open{display:block;}
  .collapsed-hint{font-size:12px;color:var(--ink-faint);margin-top:2px;}
  .count-badge{font-size:11px;color:var(--ink-faint);font-weight:400;}
  .field{margin-bottom:10px;}
  .field label{display:block;font-size:12px;color:var(--ink-faint);margin-bottom:5px;}
  input[type=text], input[type=number], select{
    width:100%;background:var(--surface-2);border:1px solid var(--line);
    color:var(--ink);border-radius:9px;padding:10px 11px;font-family:inherit;
    font-size:14px;outline:none;
  }
  input[type=number]{font-variant-numeric:tabular-nums;}
  input:focus, select:focus{border-color:var(--gold-soft);}
  select{appearance:none;background-image:none;}
  .row2{display:flex;gap:8px;}
  .row2 > *{flex:1;}
  .chips{display:flex;flex-wrap:wrap;gap:7px;}
  .chip{
    padding:8px 13px;border-radius:999px;border:1px solid var(--line);
    background:var(--surface-2);color:var(--ink-dim);font-size:13px;cursor:pointer;
    user-select:none;
  }
  .chip.on{background:var(--gold-bg);border-color:var(--gold-soft);color:var(--gold);font-weight:500;}
  .btn{
    width:100%;padding:12px;border-radius:10px;border:none;
    background:var(--gold);color:#1a1607;font-family:inherit;font-size:14px;
    font-weight:600;cursor:pointer;
  }
  .btn:active{opacity:.85;}
  .btn-ghost{
    background:transparent;border:1px solid var(--line);color:var(--ink-dim);
    width:auto;padding:8px 14px;font-weight:400;font-size:12.5px;
  }
  .empty{
    text-align:center;color:var(--ink-faint);font-size:13px;padding:30px 10px;
  }
  .person-row{
    padding:10px 4px;border-bottom:1px solid var(--line);
  }
  .person-row:last-child{border-bottom:none;}
  .person-top{display:flex;align-items:center;justify-content:space-between;}
  .person-name{display:flex;align-items:center;gap:10px;font-size:14px;}
  .avatar{
    width:30px;height:30px;border-radius:50%;background:var(--surface-2);
    border:1px solid var(--line);display:flex;align-items:center;justify-content:center;
    font-size:12px;color:var(--gold);flex-shrink:0;
  }
  .group-tag{
    font-size:10.5px;color:var(--teal);background:var(--teal-bg);
    padding:2px 8px;border-radius:999px;margin-right:6px;white-space:nowrap;
  }
  .group-tag.head::before{content:'★ ';}
  .person-sub{
    display:flex;align-items:center;gap:8px;margin-top:9px;padding-right:40px;
  }
  .person-sub select{
    flex:1;font-size:12px;padding:7px 9px;background:var(--surface-2);
    border:1px solid var(--line);color:var(--ink-dim);border-radius:8px;font-family:inherit;
  }
  .head-toggle{
    background:none;border:1px solid var(--line);border-radius:8px;
    padding:6px 11px;font-size:11.5px;color:var(--ink-faint);cursor:pointer;
    white-space:nowrap;font-family:inherit;
  }
  .head-toggle.on{color:var(--gold);border-color:var(--gold-soft);background:var(--gold-bg);}
  .del{background:none;border:none;color:var(--ink-faint);font-size:16px;cursor:pointer;padding:4px 8px;}
  .edit-btn{background:none;border:none;color:var(--ink-faint);font-size:13px;cursor:pointer;padding:4px 8px;}
  .row-actions{display:flex;align-items:center;gap:2px;}
  .person-edit-row{display:flex;gap:8px;padding:10px 4px;border-bottom:1px solid var(--line);}
  .person-edit-row:last-child{border-bottom:none;}
  .person-edit-row input{flex:1;}
  .person-edit-row button{flex:0 0 auto;padding:8px 12px;font-size:12.5px;}
  .btn-row{display:flex;gap:8px;}
  .btn-row .btn{flex:1;}

  .group-row{
    display:flex;align-items:center;justify-content:space-between;
    padding:10px 4px;border-bottom:1px solid var(--line);font-size:13.5px;
  }
  .group-row:last-child{border-bottom:none;}
  .group-row .members{font-size:11px;color:var(--ink-faint);margin-top:3px;}

  .type-toggle, .scope-toggle{
    display:flex;gap:6px;background:var(--surface-2);border-radius:10px;padding:3px;
  }
  .type-btn, .scope-btn{
    flex:1;border:none;background:transparent;color:var(--ink-dim);
    font-family:inherit;font-size:12px;padding:8px 6px;border-radius:8px;cursor:pointer;
  }
  .type-btn.active, .scope-btn.active{background:var(--gold-bg);color:var(--gold);font-weight:600;}

  .personal-badge{
    font-size:10px;color:var(--teal);background:var(--teal-bg);
    padding:2px 7px;border-radius:999px;margin-right:6px;
  }

  .expense{
    border-bottom:1px solid var(--line);padding:12px 2px;
  }
  .expense:last-child{border-bottom:none;}
  .expense .top{display:flex;justify-content:space-between;align-items:flex-start;gap:8px;}
  .expense .desc{font-size:14px;font-weight:500;}
  .expense .meta{font-size:11.5px;color:var(--ink-faint);margin-top:3px;}
  .expense-time{font-size:9.5px;color:var(--ink-faint);opacity:.7;margin-top:2px;font-variant-numeric:tabular-nums;}
  .expense .amt{font-size:15px;font-weight:600;color:var(--gold);white-space:nowrap;}
  .expense .amt .toman{display:block;font-size:11px;font-weight:400;color:var(--ink-faint);}
  .expense .del{margin-top:2px;}

  .balance-row{
    display:flex;align-items:center;justify-content:space-between;
    padding:11px 4px;border-bottom:1px solid var(--line);
  }
  .balance-row:last-child{border-bottom:none;}
  .balance-val{font-size:14px;font-weight:600;}
  .pos{color:var(--teal);} .neg{color:var(--red);}
  .tag{font-size:10.5px;padding:2px 8px;border-radius:999px;margin-right:6px;}
  .tag.pos{background:var(--teal-bg);}
  .tag.neg{background:var(--red-bg);}

  .settle-item{
    display:flex;align-items:center;gap:9px;padding:11px 4px;
    border-bottom:1px solid var(--line);font-size:13.5px;
    cursor:pointer;
  }
  .settle-item .chevron{
    color:var(--ink-faint);font-size:16px;transition:transform .15s;
    flex-shrink:0;
  }
  .settle-item.open .chevron{transform:rotate(90deg);color:var(--gold);}
  .settle-item:last-child{border-bottom:none;}
  .settle-item .arrow{color:var(--gold);font-size:15px;}
  .settle-item b{font-weight:600;}
  .settle-item .amt{margin-right:auto;font-weight:600;color:var(--gold);display:flex;flex-direction:column;align-items:flex-end;gap:1px;}
  .settle-toman{font-weight:400;font-size:10.5px;color:var(--ink-faint);}
  .settle-group-title{
    font-size:12.5px;color:var(--gold);font-weight:600;padding:10px 4px 8px;
    display:flex;align-items:center;justify-content:space-between;cursor:pointer;user-select:none;
  }
  .settle-group-title:first-child{padding-top:0;}
  .settle-group-title .chevron{color:var(--gold-soft);font-size:15px;transition:transform .15s;}
  .settle-group-title.open .chevron{transform:rotate(90deg);}
  .settle-group-body{margin-bottom:4px;}
  .settle-detail{
    display:none;background:var(--surface-2);border-radius:10px;
    padding:2px 10px;margin:2px 0 8px;
  }
  .settle-detail.open{display:block;}
  .settle-detail-row{padding:9px 2px;border-bottom:1px solid var(--line);}
  .settle-detail-row:last-child{border-bottom:none;}
  .settle-detail-top{display:flex;justify-content:space-between;align-items:center;font-size:12.5px;}
  .settle-detail-meta{font-size:11px;color:var(--ink-faint);margin-top:3px;}

  .person-bal-card{border-bottom:1px solid var(--line);padding:12px 4px;}
  .person-bal-card:last-child{border-bottom:none;}
  .person-bal-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:8px;}
  .cur-rows{display:flex;flex-direction:column;gap:5px;margin-bottom:8px;}
  .cur-row{display:flex;justify-content:space-between;font-size:12.5px;color:var(--ink-dim);}
  .cur-row .cur-label{color:var(--ink-faint);}
  .total-row{display:flex;justify-content:space-between;align-items:center;padding-top:8px;border-top:1px dashed var(--line);}
  .total-row .lbl{font-size:12px;color:var(--ink-faint);}

  .hint{font-size:11.5px;color:var(--ink-faint);line-height:1.9;margin-top:2px;}
  footer{text-align:center;padding:22px 14px 4px;color:var(--ink-faint);font-size:11px;line-height:2;}
  .app-version{text-align:center;color:var(--ink-faint);font-size:10px;opacity:.6;margin-top:16px;letter-spacing:.3px;}

  .trip-chip{
    margin-top:12px;width:100%;display:flex;align-items:center;gap:6px;
    background:var(--surface);border:1px solid var(--line);border-radius:10px;
    padding:9px 12px;color:var(--gold);font-family:inherit;font-size:12.5px;
    cursor:pointer;font-weight:600;
  }
  .trip-chip #currentTripName{unicode-bidi:isolate;direction:rtl;}
  .trip-row{
    display:flex;align-items:center;justify-content:space-between;
    padding:10px 4px;border-bottom:1px solid var(--line);font-size:13.5px;
    cursor:pointer;
  }
  .trip-row:last-child{border-bottom:none;}
  .trip-row.active .trip-name{color:var(--gold);font-weight:600;}
  .trip-info{unicode-bidi:isolate;direction:rtl;}
  .trip-name{unicode-bidi:isolate;direction:rtl;}

  .calc-fab{
    position:fixed; left:16px; bottom:calc(18px + env(safe-area-inset-bottom));
    width:52px;height:52px;border-radius:50%;
    background:var(--gold);color:#1a1607;border:none;
    font-size:22px;box-shadow:0 4px 14px rgba(0,0,0,.4);
    display:flex;align-items:center;justify-content:center;
    z-index:42;cursor:pointer;
  }
  .calc-overlay{
    display:none;position:fixed;inset:0;background:rgba(0,0,0,.45);z-index:40;
  }
  .calc-overlay.open{display:block;}
  .calc-panel{
    display:none;position:fixed;left:50%;bottom:calc(84px + env(safe-area-inset-bottom));
    transform:translateX(-50%);width:min(300px,88vw);
    background:var(--surface);border:1px solid var(--line);border-radius:16px;
    padding:14px;z-index:41;box-shadow:0 10px 30px rgba(0,0,0,.5);
  }
  .calc-panel.open{display:block;}
  .calc-header{
    display:flex;align-items:center;justify-content:space-between;
    font-size:13px;color:var(--ink-dim);margin-bottom:8px;
  }
  .calc-display{
    background:var(--surface-2);border:1px solid var(--line);border-radius:10px;
    padding:14px 12px;text-align:left;font-size:22px;color:var(--gold);
    font-variant-numeric:tabular-nums;margin-bottom:10px;
    overflow-x:auto;white-space:nowrap;
  }
  .calc-grid{
    display:grid;grid-template-columns:repeat(4,1fr);gap:8px;
  }
  .calc-btn{
    background:var(--surface-2);border:1px solid var(--line);color:var(--ink);
    font-family:inherit;font-size:16px;padding:12px 0;border-radius:10px;cursor:pointer;
  }
  .calc-btn:active{background:var(--line);}
  .calc-btn.calc-op{color:var(--gold);}
  .calc-btn.calc-eq{background:var(--gold);color:#1a1607;font-weight:700;border-color:var(--gold);}