:root{--ios-bg-primary: #FFFFFF;--ios-bg-secondary: #F2F2F7;--ios-bg-grouped: #F2F2F7;--ios-label: #000000;--ios-label-secondary: rgba(60, 60, 67, .6);--ios-label-tertiary: rgba(60, 60, 67, .3);--ios-separator: rgba(60, 60, 67, .29);--ios-gray6: #F2F2F7;--ios-blue: #007AFF;--ios-red: #FF3B30;--ios-green: #34C759;--ios-radius-md: 10px;--ios-radius-lg: 12px;--ios-font-title3: 20px;--ios-font-body: 17px;--ios-font-subheadline: 15px;--ios-touch-target: 44px}[data-theme=dark],html[data-theme=dark]{--ios-bg-primary: #1C1C1E;--ios-bg-secondary: #2C2C2E;--ios-bg-grouped: #000000;--ios-label: #FFFFFF;--ios-label-secondary: rgba(235, 235, 245, .6);--ios-label-tertiary: rgba(235, 235, 245, .3);--ios-separator: rgba(84, 84, 88, .6);--ios-gray6: #2C2C2E}.home{background:var(--ios-bg-grouped);min-height:100vh;padding-bottom:env(safe-area-inset-bottom,0px)}.home-header{display:flex;align-items:center;justify-content:space-between;padding:11px 16px;background:var(--ios-bg-primary);border-bottom:.33px solid var(--ios-separator);min-height:44px;position:sticky;top:0;z-index:50}.home-header h1{font-size:17px;font-weight:600;color:var(--ios-label);margin:0 12px 0 0;line-height:22px;letter-spacing:-.41px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;flex:1}.header-actions{display:flex;gap:8px}.icon-btn{width:44px;height:44px;background:transparent;border:none;font-size:28px;font-weight:300;color:var(--ios-blue);cursor:pointer;display:flex;align-items:center;justify-content:center;border-radius:var(--ios-radius-full);line-height:1}.icon-btn:active{background:var(--ios-gray6)}.loading{display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:50vh;gap:12px}.spinner{width:28px;height:28px;border:2px solid var(--ios-gray5);border-top-color:var(--ios-blue);border-radius:var(--ios-radius-full);animation:spin .8s linear infinite}.loading span{font-size:var(--ios-font-subheadline);color:var(--ios-label-secondary)}.cards-list{padding:16px;display:flex;flex-direction:column;gap:12px}.card-item{position:relative;background:linear-gradient(135deg,#667eea,#764ba2);border-radius:12px;padding:12px;cursor:pointer;overflow:hidden;box-shadow:0 2px 10px #0000001a;min-height:90px;display:flex;flex-direction:column;justify-content:space-between}.card-item:before{content:"";position:absolute;top:0;left:0;right:0;bottom:0;background:radial-gradient(circle at 30% 40%,rgba(255,255,255,.15) 0%,transparent 50%),radial-gradient(circle at 70% 80%,rgba(255,255,255,.1) 0%,transparent 40%);pointer-events:none}.card-item[data-bank=sber]{background:linear-gradient(135deg,#21a038,#0d7a2a)}.card-item[data-bank=tinkoff]{background:linear-gradient(135deg,#fd0,#ffb800)}.card-item[data-bank=tinkoff] .card-name,.card-item[data-bank=tinkoff] .card-number{color:#000;text-shadow:none}.card-item[data-bank=alfa]{background:linear-gradient(135deg,#ef3124,#c41e1e)}.card-item[data-bank=vtb]{background:linear-gradient(135deg,#002882,#001a5c)}.card-item[data-bank=raiff]{background:linear-gradient(135deg,#fc0,#ff9500)}.card-item[data-bank=raiff] .card-name,.card-item[data-bank=raiff] .card-number{color:#000;text-shadow:none}.card-header{display:flex;align-items:flex-start;justify-content:space-between;position:relative;z-index:1}.card-icon-large{width:36px;height:36px;background:#fff3;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border-radius:8px;display:flex;align-items:center;justify-content:center;font-size:20px}.card-info{position:relative;z-index:1}.card-name{font-size:17px;font-weight:600;color:#fff;letter-spacing:-.2px;text-shadow:none;margin-bottom:2px}.card-number{font-family:SF Mono,SFMono-Regular,ui-monospace,monospace;font-size:var(--ios-font-callout);color:#ffffffe6;letter-spacing:2px}.card-cashback{display:flex;align-items:center;gap:8px;position:relative;z-index:1;margin-top:auto;padding-top:8px}.cashback-percent{font-size:17px;font-weight:600;color:#fff;letter-spacing:0;text-shadow:none}.cashback-category{font-size:15px;color:#fff;font-weight:500;text-shadow:none}.card-item[data-bank=tinkoff] .cashback-percent,.card-item[data-bank=tinkoff] .cashback-category,.card-item[data-bank=raiff] .cashback-percent,.card-item[data-bank=raiff] .cashback-category{color:#000;text-shadow:none}.empty-state{display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:60vh;padding:40px 32px;text-align:center}.empty-state-icon-large{font-size:64px;margin-bottom:16px;opacity:.4}.empty-state h2{font-size:var(--ios-font-title3);font-weight:700;color:var(--ios-label);margin:0 0 8px;line-height:24px;letter-spacing:-.41px}.empty-state .text-hint{font-size:var(--ios-font-body);color:var(--ios-label-secondary);margin:0 0 24px;line-height:22px;max-width:280px}.empty-state .btn-primary{width:100%;max-width:280px;height:44px;background:var(--ios-blue);color:#fff;border:none;border-radius:var(--ios-radius-md);font-size:var(--ios-font-body);font-weight:600;cursor:pointer;margin-bottom:12px}.empty-state .btn-secondary{width:100%;max-width:280px;height:44px;background:var(--ios-gray6);color:var(--ios-blue);border:none;border-radius:var(--ios-radius-md);font-size:var(--ios-font-body);font-weight:600;cursor:pointer}.error-banner{margin:12px 16px;padding:12px 16px;background:#ffebee;border-radius:12px;display:flex;align-items:center;justify-content:space-between;gap:12px;border:.5px solid rgba(255,59,48,.2)}.error-banner span{font-size:15px;color:#d32f2f;line-height:20px}.error-banner button{height:32px;padding:0 16px;background:#ff3b301a;color:#d32f2f;border:none;border-radius:8px;font-size:15px;font-weight:600;cursor:pointer;flex-shrink:0}.error-banner button:active{background:#ff3b3033}.home-footer{padding:16px;text-align:center}.home-footer .text-hint{font-size:var(--ios-font-footnote);color:var(--ios-label-secondary)}@media (min-width: 768px){.home{max-width:430px;margin:0 auto}}@media (prefers-reduced-motion: reduce){.spinner{animation:none}}.card-detail{min-height:100vh;background:var(--ios-bg-grouped)}.card-detail-header{background:var(--ios-bg-primary);padding-bottom:16px}.card-detail-nav{display:flex;align-items:center;padding:8px}.back-button{background:transparent;border:none;width:44px;height:44px;display:flex;align-items:center;justify-content:center;color:var(--ios-blue);font-size:28px;cursor:pointer;padding:0;flex-shrink:0}.back-button:before{content:"‹";margin-top:-4px}.card-title{flex:1;margin:0;color:var(--ios-label);font-size:17px;font-weight:600;text-align:center;padding-right:44px}.card-visual{margin:0 16px;border-radius:16px;padding:24px;color:#fff;box-shadow:0 4px 20px #00000026;min-height:180px;display:flex;flex-direction:column;position:relative;overflow:hidden}.card-visual:before{content:"";position:absolute;top:0;left:0;right:0;bottom:0;background:radial-gradient(circle at 30% 40%,rgba(255,255,255,.15) 0%,transparent 50%),radial-gradient(circle at 70% 80%,rgba(255,255,255,.1) 0%,transparent 40%);pointer-events:none}.card-visual-icon{font-size:28px;margin-bottom:auto;position:relative;z-index:1}.card-visual-number{font-size:20px;font-family:SF Mono,SFMono-Regular,ui-monospace,monospace;letter-spacing:2px;margin-bottom:12px;text-shadow:0 1px 2px rgba(0,0,0,.3);position:relative;z-index:1}.card-visual-bank{font-size:15px;font-weight:600;text-transform:uppercase;opacity:.95;position:relative;z-index:1}.card-detail-info{padding:20px 16px}.cashback-section{background:var(--ios-bg-primary);border-radius:12px;overflow:hidden;margin-bottom:16px}.cashback-section-header{display:flex;align-items:center;gap:8px;padding:12px 16px;border-bottom:.33px solid var(--ios-separator)}.cashback-section-header h3{margin:0;color:var(--ios-label);font-size:17px;font-weight:600}.cashback-icon{font-size:20px;color:var(--ios-blue)}.cashback-list{display:flex;flex-direction:column}.cashback-item{display:flex;align-items:center;gap:12px;padding:12px 16px;border-bottom:.33px solid var(--ios-separator)}.cashback-item:last-child{border-bottom:none}.cashback-percent{font-size:17px;font-weight:400;color:var(--ios-label);min-width:50px;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif;text-shadow:none;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}.cashback-category{flex:1;color:var(--ios-label);font-size:17px;font-weight:400;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif;text-shadow:none;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}.cashback-valid{font-size:13px;color:var(--ios-label-secondary)}.no-cashback{color:var(--ios-label-secondary);text-align:center;padding:32px 16px;margin:0;font-size:15px}.btn-add-cashback{width:100%;padding:12px 16px;border:none;border-top:.33px solid var(--ios-separator);background:transparent;color:var(--ios-blue);font-size:17px;font-weight:400;cursor:pointer;display:flex;align-items:center;justify-content:center;gap:6px}.btn-add-cashback:active{background:var(--ios-gray6)}.card-actions{display:flex;flex-direction:column;gap:12px}.btn-transactions{width:100%;height:44px;border:none;border-radius:10px;background:var(--ios-blue);color:#fff;font-size:17px;font-weight:600;cursor:pointer;display:flex;align-items:center;justify-content:center;gap:8px}.btn-transactions:active{opacity:.8}.btn-delete{width:100%;height:44px;border:none;border-radius:10px;background:transparent;color:var(--ios-red);font-size:17px;font-weight:400;cursor:pointer;display:flex;align-items:center;justify-content:center;gap:8px}.btn-delete:active{background:#ff3b301a}.card-detail-empty{display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:50vh;padding:40px;text-align:center}.card-detail-empty p{color:var(--ios-label-secondary);font-size:17px;margin-bottom:20px}.card-detail-empty button{padding:12px 24px;background:var(--ios-blue);color:#fff;border:none;border-radius:10px;font-size:17px;font-weight:600;cursor:pointer}.add-card{padding:20px;min-height:100vh;background:var(--tg-theme-bg-color, #1a1a1a);display:flex;flex-direction:column}.add-card-header{margin-bottom:24px}.add-card-header .icon{font-size:32px;display:block;margin-bottom:12px}.add-card-header h2{margin:0 0 8px;font-size:22px;color:var(--tg-theme-text-color, #fff);font-weight:600}.subtitle{color:var(--tg-theme-hint-color, #999);margin:0;font-size:14px}.selected-info{background:var(--tg-theme-secondary-bg-color, #2a2a2a);padding:16px;border-radius:12px;margin-bottom:20px;color:var(--tg-theme-text-color, #fff);font-size:15px;border:1px solid var(--tg-theme-section-separator-color, #333)}.text-input{width:100%;padding:16px;font-size:17px;border:1px solid var(--tg-theme-section-separator-color, #444);border-radius:12px;background:var(--tg-theme-bg-color, #1a1a1a);color:var(--tg-theme-text-color, #fff);margin-bottom:16px;box-sizing:border-box;height:56px}.text-input:focus{outline:none;border-color:var(--tg-theme-button-color, #8bc34a)}.text-input::placeholder{color:var(--tg-theme-hint-color, #666)}.buttons{display:flex;flex-direction:column;gap:12px;margin-top:auto;padding-top:20px}.btn-primary{width:100%;padding:16px;border:none;border-radius:12px;background:var(--tg-theme-button-color, #8bc34a);color:var(--tg-theme-button-text-color, #000);font-size:17px;font-weight:600;cursor:pointer;transition:opacity .2s;height:56px;display:flex;align-items:center;justify-content:center;gap:8px}.btn-primary:disabled{opacity:.6;cursor:not-allowed}.btn-primary:active:not(:disabled){opacity:.8}.btn-secondary{width:100%;padding:16px;border:1px solid var(--tg-theme-button-color, #8bc34a);border-radius:12px;background:transparent;color:var(--tg-theme-button-color, #8bc34a);font-size:17px;font-weight:600;cursor:pointer;height:56px;display:flex;align-items:center;justify-content:center}.btn-secondary:active{background:var(--tg-theme-secondary-bg-color, #2a2a2a)}.error{color:#ef4444;margin:0 0 16px;font-size:14px;text-align:center;padding:12px;background:#ef44441a;border-radius:8px}.image-upload-container{margin-bottom:20px}.image-upload-placeholder{position:relative;border:2px dashed var(--tg-theme-section-separator-color, #444);border-radius:12px;padding:32px 20px;text-align:center;cursor:pointer;transition:all .2s;background:var(--tg-theme-secondary-bg-color, #2a2a2a)}.image-upload-placeholder:hover{border-color:var(--tg-theme-button-color, #8bc34a);background:var(--tg-theme-bg-color, #1a1a1a)}.image-input{position:absolute;top:0;left:0;width:100%;height:100%;opacity:0;cursor:pointer}.image-upload-label{display:flex;flex-direction:column;align-items:center;gap:8px;cursor:pointer}.upload-icon{font-size:40px;margin-bottom:4px}.upload-text{font-size:16px;color:var(--tg-theme-text-color, #fff);font-weight:500}.upload-hint{font-size:13px;color:var(--tg-theme-hint-color, #999)}.image-preview-wrapper{position:relative;border-radius:12px;overflow:hidden;background:var(--tg-theme-secondary-bg-color, #2a2a2a)}.image-preview{width:100%;max-height:200px;object-fit:contain;display:block;background:var(--tg-theme-bg-color, #1a1a1a)}.btn-remove-image{position:absolute;top:8px;right:8px;padding:8px 12px;background:#ef4444e6;color:#fff;border:none;border-radius:8px;font-size:14px;font-weight:500;cursor:pointer;transition:background .2s}.btn-remove-image:hover{background:#ef4444}:root{--tg-theme-bg-color: #ffffff;--tg-theme-text-color: #000000;--tg-theme-hint-color: #999999;--tg-theme-link-color: #007aff;--tg-theme-button-color: #007aff;--tg-theme-button-text-color: #ffffff;--tg-theme-secondary-bg-color: #f2f2f7;--tg-theme-section-bg-color: #ffffff;--tg-theme-section-header-text-color: #000000;--tg-theme-section-separator-color: #e5e5ea;--tg-theme-subtitle-text-color: #6d6d72;--tg-theme-destructive-text-color: #ff3b30;--ios-blue: #007aff;--ios-green: #34c759;--ios-red: #ff3b30;--ios-orange: #ff9500;--ios-yellow: #ffcc00;--ios-purple: #af52de;--ios-teal: #5ac8fa;--ios-pink: #ff2d55;--ios-bg-primary: var(--tg-theme-bg-color, #ffffff);--ios-bg-secondary: var(--tg-theme-secondary-bg-color, #f2f2f7);--ios-bg-tertiary: var(--tg-theme-section-bg-color, #ffffff);--ios-label: var(--tg-theme-text-color, #000000);--ios-label-secondary: var(--tg-theme-hint-color, #999999);--ios-label-tertiary: var(--tg-theme-subtitle-text-color, #6d6d72);--ios-separator: var(--tg-theme-section-separator-color, #e5e5ea);--ios-font-large-title: 34px;--ios-font-title1: 28px;--ios-font-title2: 22px;--ios-font-title3: 20px;--ios-font-headline: 17px;--ios-font-body: 17px;--ios-font-callout: 16px;--ios-font-subheadline: 15px;--ios-font-footnote: 13px;--ios-font-caption1: 12px;--ios-font-caption2: 11px;--ios-space-xs: 4px;--ios-space-sm: 8px;--ios-space-md: 16px;--ios-space-lg: 24px;--ios-space-xl: 32px;--ios-radius-sm: 8px;--ios-radius-md: 10px;--ios-radius-lg: 16px;--ios-radius-xl: 20px;--ios-radius-full: 9999px;--ios-shadow-sm: 0 .5px 0 0 rgba(0, 0, 0, .15);--ios-shadow-md: 0 4px 16px rgba(0, 0, 0, .12);--ios-touch-target: 44px}.splitwise-header{display:flex;align-items:center;justify-content:space-between;padding:11px 16px;background:var(--ios-bg-primary);border-bottom:.33px solid var(--ios-separator);min-height:44px}.splitwise-header h2{font-size:var(--ios-font-headline);font-weight:600;color:var(--ios-label);margin:0;line-height:22px;letter-spacing:-.41px;position:absolute;left:50%;transform:translate(-50%);max-width:60%;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.btn-back{background:transparent;border:none;width:44px;height:44px;display:flex;align-items:center;justify-content:center;font-size:28px;color:var(--ios-blue);cursor:pointer;padding:0;margin:0;font-weight:300}.splitwise-groups{background:var(--ios-bg-grouped);min-height:100vh;padding-bottom:34px}.groups-actions{display:flex;gap:12px;padding:16px;background:var(--ios-bg-primary)}.groups-actions .btn-primary,.groups-actions .btn-secondary{flex:1;height:44px;border-radius:var(--ios-radius-md);font-size:15px;font-weight:600;display:flex;align-items:center;justify-content:center;gap:6px;border:none;cursor:pointer;transition:all .2s}.groups-actions .btn-primary{background:var(--ios-blue);color:#fff}.groups-actions .btn-primary.active{background:var(--ios-blue);opacity:.8}.groups-actions .btn-secondary{background:var(--ios-gray6);color:var(--ios-blue)}.groups-actions .btn-secondary.active{background:var(--ios-blue);color:#fff}.btn-icon{font-size:18px;font-weight:300}.btn-text{font-size:15px}.ios-form{background:var(--ios-bg-primary);margin:16px;border-radius:var(--ios-radius-lg);overflow:hidden;box-shadow:0 2px 8px #00000014}.ios-input-group{padding:12px 16px;border-bottom:.33px solid var(--ios-separator)}.ios-input-group input{width:100%;height:36px;border:none;background:transparent;font-size:var(--ios-font-body);color:var(--ios-label);outline:none}.ios-input-group input::placeholder{color:var(--ios-label-tertiary)}.ios-form-actions{display:flex;padding:12px 16px;gap:12px;justify-content:flex-end}.ios-btn-cancel{height:36px;padding:0 16px;background:transparent;border:none;font-size:var(--ios-font-body);color:var(--ios-blue);cursor:pointer;border-radius:var(--ios-radius-md)}.ios-btn-cancel:active{background:var(--ios-gray6)}.ios-btn-confirm{height:36px;padding:0 16px;background:var(--ios-blue);border:none;border-radius:var(--ios-radius-md);font-size:var(--ios-font-body);font-weight:600;color:#fff;cursor:pointer}.ios-btn-confirm:disabled{opacity:.5;cursor:not-allowed}.ios-btn-confirm:active:not(:disabled){opacity:.8}.create-group-form input::placeholder,.join-group-form input::placeholder{color:var(--ios-label-tertiary)}.groups-list{background:var(--ios-bg-primary);margin:16px;border-radius:var(--ios-radius-lg);overflow:hidden}.group-card{display:flex;align-items:center;padding:12px 16px;min-height:var(--ios-touch-target);border-bottom:.33px solid var(--ios-separator);cursor:pointer;background:var(--ios-bg-primary)}.group-card:last-child{border-bottom:none}.group-card:active{background:var(--ios-gray6)}.group-info{flex:1;min-width:0}.group-info h3{font-size:var(--ios-font-body);font-weight:400;color:var(--ios-label);margin:0 0 2px;line-height:22px;letter-spacing:-.41px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.group-meta{display:flex;gap:12px;font-size:var(--ios-font-footnote);color:var(--ios-label-secondary);line-height:16px}.group-arrow{color:var(--ios-label-quaternary);font-size:22px;margin-left:8px;font-weight:300;line-height:1}.group-detail{background:var(--ios-bg-grouped);min-height:100vh}.group-info-bar{display:flex;gap:24px;padding:8px 16px;background:var(--ios-bg-primary);font-size:var(--ios-font-footnote);color:var(--ios-label-secondary);border-bottom:.33px solid var(--ios-separator)}.tabs{display:flex;justify-content:center;padding:12px 16px;background:var(--ios-bg-primary);border-bottom:.33px solid var(--ios-separator)}.tabs button{flex:1;max-width:120px;height:32px;padding:0 12px;background:transparent;border:none;font-size:var(--ios-font-subheadline);font-weight:500;color:var(--ios-label-secondary);cursor:pointer;border-radius:var(--ios-radius-full);transition:all .2s}.tabs button.active{background:var(--ios-gray6);color:var(--ios-label)}.expenses-list{background:var(--ios-bg-grouped);padding-top:8px}.expense-item{display:flex;flex-direction:column;gap:4px;padding:12px 16px;background:var(--ios-bg-primary);border-bottom:.33px solid var(--ios-separator);cursor:pointer}.expense-item:active{background:var(--ios-bg-secondary)}.expense-header{flex:1;min-width:0}.expense-description{font-size:var(--ios-font-body);font-weight:400;color:var(--ios-label);line-height:22px;letter-spacing:-.41px;margin-bottom:2px}.expense-meta{display:flex;align-items:center;justify-content:space-between;gap:8px;font-size:var(--ios-font-footnote);color:var(--ios-label-secondary);line-height:16px}.expense-amount{font-size:var(--ios-font-subheadline);font-weight:600;color:var(--ios-green);line-height:22px;margin-left:12px;white-space:nowrap}.expense-amount.negative{color:var(--ios-red)}.settings-list{padding:0 16px}.setting-item{background:var(--ios-bg-primary);padding:12px 16px;border-bottom:.33px solid var(--ios-separator)}.setting-item:first-child{border-radius:var(--ios-radius-lg) var(--ios-radius-lg) 0 0}.setting-item:last-child{border-bottom:none;border-radius:0 0 var(--ios-radius-lg) var(--ios-radius-lg)}.setting-item:first-child:last-child{border-radius:var(--ios-radius-lg)}.setting-item label{display:block;font-size:var(--ios-font-footnote);color:var(--ios-label-secondary);line-height:16px;margin-bottom:8px;text-transform:uppercase;letter-spacing:.5px}.setting-item select{width:100%;height:32px;border:none;background:transparent;font-size:var(--ios-font-body);color:var(--ios-label);outline:none;cursor:pointer}.invite-code-row{display:flex;align-items:center;justify-content:space-between;gap:12px}.invite-code-row code{font-family:SF Mono,SFMono-Regular,ui-monospace,monospace;font-size:20px;font-weight:600;color:var(--ios-label);letter-spacing:2px;flex:1}.invite-code-actions{display:flex;gap:8px}.invite-code-actions button{height:32px;padding:0 12px;border-radius:8px;font-size:13px;font-weight:600;cursor:pointer;border:none}.btn-copy{background:var(--ios-blue);color:#fff}.btn-regenerate{background:var(--ios-gray6);color:var(--ios-blue)}.btn-danger{width:100%;height:44px;background:transparent;color:var(--ios-red);border:1px solid var(--ios-red);border-radius:10px;font-size:17px;font-weight:400;cursor:pointer;display:flex;align-items:center;justify-content:center;gap:8px}.btn-danger:active{background:#ff3b301a}.setting-item.danger{display:flex;flex-direction:column;gap:12px}.modal-overlay{position:fixed;top:0;left:0;right:0;bottom:0;background:#0006;z-index:1000;display:flex;align-items:flex-end}.modal{width:100%;max-height:90vh;background:var(--ios-bg-grouped);border-radius:var(--ios-radius-xl) var(--ios-radius-xl) 0 0;animation:sheetUp .35s 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