/* ============================================================
   Split Bill Calculator — split-bill.css
   Mobile-first. Scoped to .sb-wrap
   ============================================================ */
.sb-wrap*,.sb-wrap *::before,.sb-wrap *::after{box-sizing:border-box;margin:0;padding:0}
.sb-wrap{font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif;font-size:15px;color:#1e293b;max-width:900px;margin:0 auto;background:#fff;border:1px solid #e2e8f0;border-radius:16px;overflow:hidden}

/* Header */
.sb-header{display:flex;align-items:flex-start;justify-content:space-between;flex-wrap:wrap;gap:12px;padding:18px 24px 16px;background:#f8fafc;border-bottom:1px solid #e2e8f0}
.sb-title{font-size:20px;font-weight:700;color:#1e3a5f;margin-bottom:3px}
.sb-subtitle{font-size:13px;color:#64748b}
.sb-mode-toggle{display:flex;border:1.5px solid #e2e8f0;border-radius:9px;overflow:hidden;flex-shrink:0}
.sb-mode-btn{padding:8px 16px;border:none;background:#fff;font-size:13px;font-weight:600;color:#64748b;cursor:pointer;transition:all .15s}
.sb-mode-btn.active{background:#4f46e5;color:#fff}

/* Top bar */
.sb-top-bar{display:flex;gap:10px;flex-wrap:wrap;padding:14px 24px;border-bottom:1px solid #e2e8f0;background:#f8fafc;align-items:flex-end}
.sb-field{display:flex;flex-direction:column;gap:5px;flex:0 0 auto}
.sb-field-grow{flex:1 1 140px}
.sb-label{font-size:11px;font-weight:600;color:#64748b;text-transform:uppercase;letter-spacing:.05em}
.sb-select{padding:9px 28px 9px 12px;height:42px;border:1.5px solid #cbd5e1;border-radius:8px;font-size:13.5px;color:#1e293b;background:#fff url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%23718096' d='M6 8L1 3h10z'/%3E%3C/svg%3E") no-repeat right 10px center;appearance:none;outline:none;transition:border-color .18s}
.sb-select:focus{border-color:#4f46e5}
.sb-prefix-wrap,.sb-suffix-wrap{display:flex;align-items:center;border:1.5px solid #cbd5e1;border-radius:8px;overflow:hidden;background:#fff;transition:border-color .18s}
.sb-prefix-wrap:focus-within,.sb-suffix-wrap:focus-within{border-color:#4f46e5}
.sb-prefix,.sb-suffix{padding:0 10px;font-size:13px;font-weight:600;color:#64748b;background:#f1f5f9;height:42px;display:flex;align-items:center;flex-shrink:0}
.sb-prefix{border-right:1px solid #e2e8f0}
.sb-suffix{border-left:1px solid #e2e8f0}
.sb-input{flex:1;border:none;background:transparent;padding:0 12px;height:42px;font-size:14px;color:#1e293b;outline:none;min-width:0;-moz-appearance:textfield}
.sb-input::-webkit-outer-spin-button,.sb-input::-webkit-inner-spin-button{-webkit-appearance:none}

/* Panel */
.sb-panel{padding:20px 24px}
.sb-section-title{font-size:12px;font-weight:700;text-transform:uppercase;letter-spacing:.06em;color:#64748b;margin-bottom:10px}

/* Equal mode — people grid */
.sb-people-grid{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:14px}
.sb-person-chip{display:flex;align-items:center;gap:8px;padding:8px 14px;border:1.5px solid #e2e8f0;border-radius:30px;background:#fff;font-size:13.5px;color:#334155}
.sb-person-chip input[type="text"]{border:none;outline:none;width:90px;font-size:13.5px;color:#1e293b;font-family:inherit;background:transparent}
.sb-person-del{background:none;border:none;color:#cbd5e1;font-size:16px;cursor:pointer;padding:0;line-height:1;transition:color .15s}
.sb-person-del:hover{color:#ef4444}

.sb-add-person-btn{padding:8px 16px;border:1.5px dashed #cbd5e1;border-radius:8px;background:none;color:#64748b;font-size:13px;font-weight:600;cursor:pointer;transition:all .15s}
.sb-add-person-btn:hover{border-color:#4f46e5;color:#4f46e5}

/* Equal result */
.sb-equal-result{margin-top:20px;display:grid;grid-template-columns:1fr 1fr;gap:16px;align-items:start}
@media(max-width:520px){.sb-equal-result{grid-template-columns:1fr}}
.sb-result-hero{background:#4f46e5;border-radius:14px;padding:22px;text-align:center;color:#fff}
.sb-result-label{font-size:12px;font-weight:600;opacity:.8;text-transform:uppercase;letter-spacing:.07em;margin-bottom:8px}
.sb-result-amount{font-size:40px;font-weight:800;letter-spacing:-.02em;line-height:1}
.sb-result-breakdown{background:#f8fafc;border:1px solid #e2e8f0;border-radius:12px;padding:14px}
.sb-rb-row{display:flex;justify-content:space-between;padding:6px 0;font-size:13px;color:#475569;border-bottom:1px solid #f1f5f9}
.sb-rb-row:last-child{border-bottom:none}
.sb-rb-total{font-weight:700;font-size:14.5px;color:#1e3a5f;border-top:1.5px solid #e2e8f0;margin-top:4px;padding-top:10px}

/* Itemized mode */
.sb-itemized-body{display:flex;gap:20px;flex-direction:column}
@media(min-width:680px){.sb-itemized-body{flex-direction:row;align-items:flex-start}}
.sb-itemized-left{flex:1}
.sb-itemized-right{width:100%}
@media(min-width:680px){.sb-itemized-right{width:260px;flex-shrink:0}}

.sb-people-chips{display:flex;flex-wrap:wrap;gap:6px;margin-bottom:12px}
.sb-pchip{padding:6px 14px;border:1.5px solid #e2e8f0;border-radius:20px;font-size:13px;color:#334155;background:#fff;display:flex;align-items:center;gap:6px}
.sb-pchip input[type="text"]{border:none;outline:none;width:80px;font-size:13px;color:#1e293b;font-family:inherit;background:transparent}
.sb-pchip-del{background:none;border:none;color:#cbd5e1;font-size:15px;cursor:pointer;padding:0;line-height:1;transition:color .15s}
.sb-pchip-del:hover{color:#ef4444}

.sb-items-header{display:grid;grid-template-columns:1fr 100px 1fr;gap:8px;font-size:11px;font-weight:700;color:#94a3b8;text-transform:uppercase;letter-spacing:.05em;padding:0 4px;margin-bottom:6px}
.sb-item-row{display:grid;grid-template-columns:1fr 100px 1fr;gap:8px;margin-bottom:7px;align-items:center}
.sb-item-name{padding:8px 10px;border:1.5px solid #cbd5e1;border-radius:8px;font-size:13.5px;color:#1e293b;outline:none;font-family:inherit;background:#f8fafc;transition:border-color .18s;width:100%}
.sb-item-name:focus{border-color:#4f46e5;background:#fff}
.sb-item-price-wrap{display:flex;align-items:center;border:1.5px solid #cbd5e1;border-radius:8px;overflow:hidden;background:#f8fafc;transition:border-color .18s}
.sb-item-price-wrap:focus-within{border-color:#4f46e5;background:#fff}
.sb-item-sym{padding:0 7px;font-size:13px;font-weight:600;color:#64748b;background:#f1f5f9;height:40px;display:flex;align-items:center;border-right:1px solid #e2e8f0;flex-shrink:0}
.sb-item-price{flex:1;border:none;background:transparent;padding:0 8px;height:40px;font-size:13.5px;color:#1e293b;outline:none;-moz-appearance:textfield;text-align:right;min-width:0}
.sb-item-price::-webkit-outer-spin-button,.sb-item-price::-webkit-inner-spin-button{-webkit-appearance:none}
.sb-item-assignees{display:flex;flex-wrap:wrap;gap:4px;align-items:center}
.sb-assignee-btn{padding:4px 10px;border:1.5px solid #e2e8f0;border-radius:14px;font-size:12px;cursor:pointer;background:#fff;color:#64748b;transition:all .12s;white-space:nowrap}
.sb-assignee-btn.on{background:#4f46e5;border-color:#4f46e5;color:#fff}
.sb-item-del{background:none;border:none;color:#cbd5e1;font-size:18px;cursor:pointer;padding:0;line-height:1;transition:color .15s;grid-column:1/-1;justify-self:end;margin-top:-4px;margin-bottom:4px;display:none}
.sb-add-row-btn{width:100%;padding:9px;margin-top:4px;border:1.5px dashed #cbd5e1;border-radius:8px;background:none;color:#64748b;font-size:13px;font-weight:600;cursor:pointer;transition:all .15s}
.sb-add-row-btn:hover{border-color:#4f46e5;color:#4f46e5}

/* Person totals */
.sb-person-total-card{background:#f8fafc;border:1px solid #e2e8f0;border-radius:10px;padding:12px 14px;margin-bottom:8px}
.sb-pt-name{font-size:13px;font-weight:700;color:#334155;margin-bottom:8px}
.sb-pt-item-row{display:flex;justify-content:space-between;font-size:12.5px;color:#475569;padding:3px 0}
.sb-pt-divider{border:none;border-top:1px solid #e2e8f0;margin:7px 0}
.sb-pt-total-row{display:flex;justify-content:space-between;font-size:13.5px;font-weight:700;color:#4f46e5;padding:3px 0}

/* Settlement */
.sb-settlement-block{margin-top:16px;background:#f0fdf4;border:1px solid #bbf7d0;border-radius:10px;padding:14px}
.sb-settlement-title{font-size:11px;font-weight:700;text-transform:uppercase;letter-spacing:.06em;color:#15803d;margin-bottom:10px}
.sb-settlement-row{font-size:13px;color:#166534;padding:5px 0;border-bottom:1px solid #dcfce7}
.sb-settlement-row:last-child{border-bottom:none}

/* Actions */
.sb-actions{display:flex;gap:8px;padding:16px 24px;border-top:1px solid #e2e8f0}
.sb-action-btn{flex:1;padding:11px;border-radius:9px;font-size:13.5px;font-weight:600;cursor:pointer;border:none;transition:opacity .18s}
.sb-action-btn:hover{opacity:.85}
.sb-action-copy{background:#4f46e5;color:#fff}
.sb-action-reset{background:#f1f5f9;color:#64748b;border:1px solid #e2e8f0}

@media(max-width:480px){
  .sb-header{padding:16px;flex-direction:column}
  .sb-top-bar{padding:12px 16px}
  .sb-panel{padding:16px}
  .sb-title{font-size:18px}
  .sb-items-header{grid-template-columns:1fr 90px 1fr}
  .sb-item-row{grid-template-columns:1fr 90px 1fr}
}