*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}:root{--bg: #f8f9fb;--bg2: #f0f1f5;--surface: #ffffff;--surface2: #f5f6fa;--border: #e4e6ed;--border2: #d0d3de;--text: #111827;--text2: #374151;--muted: #6b7280;--accent: #6366f1;--accent2: #818cf8;--accent-dim: #e0e7ff;--danger: #ef4444;--danger-dim: #fee2e2;--warning: #f59e0b;--positive: #10b981;--negative: #ef4444;--shadow-sm: 0 1px 3px rgba(0,0,0,.07);--shadow: 0 4px 16px rgba(0,0,0,.08);--shadow-lg: 0 10px 40px rgba(0,0,0,.12);--radius: 14px;--radius-sm: 8px;--font: "Inter", system-ui, -apple-system, sans-serif}[data-theme=dark]{--bg: #0e0e16;--bg2: #13131e;--surface: #1a1a28;--surface2: #22223a;--border: #2a2a42;--border2: #36366a;--text: #f1f5f9;--text2: #cbd5e1;--muted: #94a3b8;--accent: #818cf8;--accent2: #a5b4fc;--accent-dim: #1e1f4e;--danger-dim: #2d1515;--shadow-sm: 0 1px 3px rgba(0,0,0,.3);--shadow: 0 4px 16px rgba(0,0,0,.4)}html,body{height:100%}body{font-family:var(--font);background:var(--bg);color:var(--text);line-height:1.5;-webkit-font-smoothing:antialiased;transition:background .2s,color .2s}button{font-family:var(--font);cursor:pointer;border:none;background:none;color:inherit}button:disabled{opacity:.4;cursor:not-allowed}input,select{font-family:var(--font)}.app{display:grid;grid-template-areas:"header  header" "sidebar titlebar" "sidebar main";grid-template-columns:220px 1fr;grid-template-rows:56px 48px 1fr;min-height:100dvh}.header{grid-area:header;display:flex;align-items:center;justify-content:space-between;padding:0 24px;background:var(--surface);border-bottom:1px solid var(--border);position:sticky;top:0;z-index:20}.header__brand{display:flex;align-items:center;gap:8px}.header__logo{display:block;flex-shrink:0}.header__brand-text{display:flex;flex-direction:column;gap:1px}.header__by{font-size:11px;color:var(--muted);text-decoration:none;transition:color .15s;line-height:1}.header__by:hover{color:var(--accent)}.header__title{font-size:17px;font-weight:700;letter-spacing:-.3px}.header__title-accent{color:var(--accent)}.header__actions{display:flex;align-items:center;gap:6px}.header__select{padding:5px 8px;border:1px solid var(--border);border-radius:var(--radius-sm);background:var(--surface2);color:var(--text);font-size:13px;font-weight:600;cursor:pointer}.header__btn{display:flex;align-items:center;gap:5px;padding:6px 10px;border-radius:var(--radius-sm);font-size:13px;font-weight:500;color:var(--muted);transition:background .15s,color .15s}.header__btn:hover{background:var(--bg2);color:var(--text)}.header__btn--icon{padding:6px 8px}.sidebar{grid-area:sidebar;background:var(--surface);border-right:1px solid var(--border);display:flex;flex-direction:column;padding:20px 12px 24px;gap:4px;position:sticky;top:56px;height:calc(100dvh - 56px);overflow-y:auto}.sidebar__section-label{font-size:10px;font-weight:700;text-transform:uppercase;letter-spacing:.8px;color:var(--muted);padding:0 8px 8px}.sidebar__nav{display:flex;flex-direction:column;gap:2px}.sidebar__item{display:flex;align-items:center;gap:10px;padding:10px 12px;border-radius:var(--radius-sm);font-size:14px;font-weight:500;color:var(--muted);position:relative;transition:background .15s,color .15s}.sidebar__item:hover{background:var(--bg2);color:var(--text2)}.sidebar__item--active{background:var(--accent-dim);color:var(--accent);font-weight:600}.sidebar__active-bar{position:absolute;right:0;top:6px;bottom:6px;width:3px;background:var(--accent);border-radius:4px 0 0 4px}.sidebar__divider{height:1px;background:var(--border);margin:12px 0}.sidebar__actions{display:flex;flex-direction:column;gap:6px}.sidebar__action-btn{display:flex;align-items:center;gap:7px;padding:9px 12px;border-radius:var(--radius-sm);font-size:13px;font-weight:500;color:var(--muted);border:1px solid var(--border);background:var(--surface2);transition:background .15s,color .15s,border-color .15s}.sidebar__action-btn:hover:not(:disabled){background:var(--accent-dim);color:var(--accent);border-color:var(--accent)}.sidebar__action-btn--flash{background:var(--accent-dim);color:var(--accent);border-color:var(--accent)}.sidebar__footer{margin-top:auto;padding:0 8px}.sidebar__footer-text{font-size:12px;color:var(--muted)}.page-titlebar{grid-area:titlebar;display:flex;align-items:center;justify-content:space-between;padding:0 32px;border-bottom:1px solid var(--border);background:var(--bg);gap:12px}.page-titlebar__left{display:flex;align-items:center;gap:12px}.page-titlebar__right{display:flex;align-items:center;gap:8px}.page-titlebar__title{font-size:18px;font-weight:700;flex-shrink:0}.page-titlebar__session-name{font-size:14px;font-weight:500;color:var(--muted);border:none;background:none;border-bottom:1px dashed var(--border2);padding:2px 4px;outline:none;max-width:200px;transition:border-color .15s,color .15s}.page-titlebar__session-name:focus{color:var(--text);border-color:var(--accent)}.titlebar-btn{display:flex;align-items:center;gap:5px;padding:5px 12px;border-radius:var(--radius-sm);font-size:12px;font-weight:600;border:1px solid var(--border);background:var(--surface2);color:var(--muted);transition:background .15s,color .15s}.titlebar-btn:hover:not(:disabled){background:var(--accent-dim);color:var(--accent)}.titlebar-btn--flash{background:var(--accent-dim);color:var(--accent)}.app__main{grid-area:main;padding:28px 32px;overflow-y:auto}.split-page{display:flex;flex-direction:column;gap:28px;max-width:720px}.split-section__title{font-size:13px;font-weight:700;text-transform:uppercase;letter-spacing:.6px;color:var(--muted);margin-bottom:12px}.group-setup__people{display:flex;flex-wrap:wrap;gap:8px;align-items:center}.person-chip{display:flex;align-items:center;gap:6px;background:var(--surface);border:1px solid var(--border);border-radius:24px;padding:5px 10px 5px 6px}.person-chip__avatar{width:26px;height:26px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:11px;font-weight:700;color:#fff;flex-shrink:0}.person-chip__name{font-size:13px;font-weight:500}.person-chip__input{font-size:13px;font-weight:500;width:90px;border:none;background:none;outline:none;color:var(--text)}.person-chip__action{width:22px;height:22px;border-radius:50%;display:flex;align-items:center;justify-content:center;color:var(--muted);transition:background .15s,color .15s}.person-chip__action:hover{background:var(--bg2);color:var(--text)}.person-chip__action--remove:hover{background:var(--danger-dim);color:var(--danger)}.person-add{display:flex;align-items:center;gap:4px}.person-add__input{padding:6px 12px;border:1px dashed var(--border2);border-radius:24px;background:transparent;font-size:13px;color:var(--text);outline:none;width:140px;transition:border-color .15s}.person-add__input:focus{border-color:var(--accent)}.person-add__btn{width:30px;height:30px;border-radius:50%;background:var(--accent);color:#fff;display:flex;align-items:center;justify-content:center;transition:background .15s}.person-add__btn:hover:not(:disabled){background:var(--accent2)}.item-list{display:flex;flex-direction:column;gap:8px}.item-list__hint{font-size:13px;color:var(--muted);padding:12px 0}.item-add{display:flex;gap:6px;align-items:center;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-sm);padding:8px 10px}.item-add__label{flex:1;min-width:0;border:none;background:none;outline:none;font-size:14px;color:var(--text)}.item-add__label::placeholder{color:var(--muted)}.item-add__amount{width:80px;border:none;border-left:1px solid var(--border);background:none;padding:0 8px;outline:none;font-size:14px;font-weight:600;color:var(--text);text-align:right}.item-add__payer{border:none;border-left:1px solid var(--border);background:none;padding:0 6px;font-size:13px;color:var(--muted);cursor:pointer;outline:none}.item-add__btn{width:32px;height:32px;border-radius:var(--radius-sm);background:var(--accent);color:#fff;display:flex;align-items:center;justify-content:center;flex-shrink:0;transition:background .15s}.item-add__btn:hover:not(:disabled){background:var(--accent2)}.item-row{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-sm);overflow:hidden;transition:border-color .15s}.item-row:hover{border-color:var(--border2)}.item-row__main{display:flex;align-items:center;gap:0;padding:0}.item-row__label{flex:1;min-width:0;padding:10px 12px;border:none;background:none;outline:none;font-size:14px;color:var(--text)}.item-row__amount{width:90px;padding:10px 8px;border:none;border-left:1px solid var(--border);background:none;outline:none;font-size:14px;font-weight:600;color:var(--text);text-align:right}.item-row__payer{padding:10px 6px;border:none;border-left:1px solid var(--border);background:none;outline:none;font-size:12px;color:var(--muted);cursor:pointer;max-width:100px}.item-row__expand,.item-row__delete{width:36px;height:40px;display:flex;align-items:center;justify-content:center;border-left:1px solid var(--border);color:var(--muted);transition:background .15s,color .15s;flex-shrink:0}.item-row__expand:hover{background:var(--bg2);color:var(--text)}.item-row__delete:hover{background:var(--danger-dim);color:var(--danger)}.item-row__summary{display:flex;align-items:center;gap:8px;padding:4px 12px 6px;border-top:1px solid var(--border)}.item-row__split{display:flex;align-items:center;gap:10px;padding:10px 12px;border-top:1px solid var(--border);background:var(--surface2);flex-wrap:wrap}.item-row__split-label{font-size:12px;color:var(--muted);font-weight:500}.item-row__avatars{display:flex;gap:4px;flex-wrap:wrap}.item-row__per-person{font-size:12px;color:var(--accent);font-weight:600;margin-left:auto}.item-row__paid-by{font-size:11px;color:var(--muted)}.avatar-btn{width:28px;height:28px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:10px;font-weight:700;color:#ffffff80;background:var(--bg2);border:2px solid var(--border);transition:background .15s,border-color .15s,color .15s}.avatar-btn--on{background:var(--color, var(--accent));border-color:var(--color, var(--accent));color:#fff}@keyframes avatar-shake{0%,to{transform:translate(0)}20%{transform:translate(-4px)}40%{transform:translate(4px)}60%{transform:translate(-3px)}80%{transform:translate(3px)}}.avatar-btn--shake{animation:avatar-shake .35s ease;border-color:var(--danger)!important}.avatar-dot{width:10px;height:10px;border-radius:50%;display:inline-block;flex-shrink:0}.tax-tip{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-sm);padding:12px 16px;display:flex;flex-direction:column;gap:8px}.tax-tip__row{display:flex;align-items:center;gap:10px;font-size:13px}.tax-tip__label{width:40px;color:var(--muted);font-weight:500}.tax-tip__input{width:64px;padding:4px 8px;border:1px solid var(--border);border-radius:6px;background:var(--surface2);color:var(--text);font-size:13px;text-align:right;outline:none;transition:border-color .15s}.tax-tip__input:focus{border-color:var(--accent)}.tax-tip__amount{color:var(--muted);font-size:12px;margin-left:auto}.tax-tip__total{display:flex;justify-content:space-between;font-size:15px;font-weight:700;color:var(--text);border-top:1px solid var(--border);padding-top:8px;margin-top:2px}.summary-empty{display:flex;flex-direction:column;align-items:center;gap:12px;padding:60px 0;color:var(--muted);font-size:14px}.summary-empty__icon{font-size:48px}.summary-view{display:flex;flex-direction:column;gap:32px;max-width:720px}.summary-section__title{font-size:13px;font-weight:700;text-transform:uppercase;letter-spacing:.6px;color:var(--muted);margin-bottom:14px}.summary-cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:12px}.summary-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:16px;transition:border-color .15s}.summary-card--owes{border-left:3px solid var(--danger)}.summary-card--owed{border-left:3px solid var(--positive)}.summary-card__top{display:flex;align-items:center;gap:10px;margin-bottom:12px}.summary-card__avatar{width:34px;height:34px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:12px;font-weight:700;color:#fff;flex-shrink:0}.summary-card__name{font-size:14px;font-weight:600;flex:1}.summary-card__balance{font-size:12px;font-weight:600}.summary-card__balance.positive{color:var(--positive)}.summary-card__balance.negative{color:var(--danger)}.summary-card__details{display:flex;flex-direction:column;gap:4px}.summary-card__row{display:flex;justify-content:space-between;font-size:12px;color:var(--muted)}.summary-card__row--total{font-weight:700;color:var(--text);font-size:13px;border-top:1px solid var(--border);padding-top:4px;margin-top:2px}.summary-card__row--paid{color:var(--positive)}.settle-done{display:flex;align-items:center;gap:8px;color:var(--positive);font-weight:600;font-size:15px}.debt-list{display:flex;flex-direction:column;gap:8px}.debt-row{display:flex;align-items:center;gap:8px;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-sm);padding:12px 16px;font-size:14px}.debt-row__avatar{width:30px;height:30px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:11px;font-weight:700;color:#fff;flex-shrink:0}.debt-row__name{font-weight:500}.debt-row__arrow{color:var(--muted);flex-shrink:0}.debt-row__amount{font-weight:700;color:var(--accent);margin:0 2px}.history-list{max-width:640px}.history-list__header{display:flex;align-items:center;justify-content:space-between;margin-bottom:16px}.history-list__title{font-size:18px;font-weight:700}.history-list__clear{display:flex;align-items:center;gap:5px;font-size:12px;color:var(--muted);padding:5px 10px;border-radius:var(--radius-sm);transition:background .15s,color .15s}.history-list__clear:hover{background:var(--danger-dim);color:var(--danger)}.history-empty{display:flex;flex-direction:column;align-items:center;gap:6px;padding:60px 0;color:var(--muted);font-size:14px}.history-items{display:flex;flex-direction:column;gap:8px}.history-item{display:flex;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-sm);overflow:hidden;transition:border-color .15s}.history-item:hover{border-color:var(--accent)}.history-item__body{flex:1;padding:14px 16px;text-align:left;display:flex;flex-direction:column;gap:4px;transition:background .15s}.history-item__body:hover{background:var(--surface2)}.history-item__top{display:flex;justify-content:space-between;align-items:baseline}.history-item__name{font-size:15px;font-weight:600}.history-item__total{font-size:15px;font-weight:700;color:var(--accent)}.history-item__meta{display:flex;justify-content:space-between;font-size:12px;color:var(--muted)}.history-item__counts{display:flex;gap:6px;font-size:11px;color:var(--muted)}.history-item__delete{padding:0 14px;border-left:1px solid var(--border);color:var(--muted);transition:background .15s,color .15s}.history-item__delete:hover{background:var(--danger-dim);color:var(--danger)}.modal-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#00000080;display:flex;align-items:center;justify-content:center;z-index:50;padding:16px}.modal{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:24px;width:100%;max-width:500px;display:flex;flex-direction:column;gap:14px;box-shadow:var(--shadow-lg)}.modal__header{display:flex;align-items:center;justify-content:space-between}.modal__title{font-size:18px;font-weight:700}.modal__close{padding:4px;border-radius:6px;color:var(--muted);transition:background .15s}.modal__close:hover{background:var(--bg2);color:var(--text)}.modal__desc{font-size:13px;color:var(--muted)}.modal__url-row{display:flex;gap:8px}.modal__url-input{flex:1;padding:8px 12px;border:1px solid var(--border);border-radius:var(--radius-sm);background:var(--surface2);color:var(--muted);font-size:12px;outline:none}.modal__copy-btn{display:flex;align-items:center;gap:6px;padding:8px 14px;border-radius:var(--radius-sm);background:var(--accent);color:#fff;font-size:13px;font-weight:600;white-space:nowrap;transition:background .15s;flex-shrink:0}.modal__copy-btn:hover{background:var(--accent2)}.modal__copy-btn--done{background:var(--positive)}.modal__note{font-size:11px;color:var(--muted)}.tab-bar{display:none}@media(max-width:768px){.app{grid-template-areas:"header" "main";grid-template-columns:1fr;grid-template-rows:56px 1fr auto;padding-bottom:68px}.sidebar,.page-titlebar{display:none}.app__main{padding:16px}.tab-bar{display:flex;position:fixed;bottom:0;left:0;right:0;height:68px;background:var(--surface);border-top:1px solid var(--border);z-index:10}.tab-bar__item{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:3px;font-size:10px;font-weight:500;color:var(--muted);position:relative}.tab-bar__item--active{color:var(--accent);font-weight:600}.tab-bar__dot{position:absolute;top:6px;width:4px;height:4px;border-radius:50%;background:var(--accent)}.tab-bar__label{font-size:10px}.summary-cards{grid-template-columns:1fr}.item-row__payer{max-width:70px;font-size:11px}}