@import url(https://fonts.googleapis.com/css2?family=Inter:wght@400;600;700&family=Montserrat:wght@400;600;700&display=swap);:root{--history-bg-light:#fff;--history-bg-dark:#23243a;--history-border-light:#e0d7f7;--history-border-dark:#35355a;--history-title-light:#2d1c4c;--history-title-dark:#f6eaff;--history-meta-light:#5e5c77;--history-meta-dark:#b1b1d6;--history-category-light:#ae58fe;--history-category-dark:#e0aaff;--history-amount-light:#2db57b;--history-amount-dark:#7fffd4;--history-expense-light:#6c78be;--history-expense-dark:#b5c6ff}[data-theme=dark] .history-item{background:#23243a;background:var(--history-bg-dark);border:2px solid #35355a;border:2px solid var(--history-border-dark)}[data-theme=dark] .history-item,[data-theme=dark] .item-title{color:#f6eaff;color:var(--history-title-dark)}[data-theme=dark] .item-category{color:#e0aaff;color:var(--history-category-dark)}[data-theme=dark] .item-meta{color:#b1b1d6;color:var(--history-meta-dark)}[data-theme=dark] .expenses-count{color:#b5c6ff;color:var(--history-expense-dark)}[data-theme=dark] .total-amount{color:#7fffd4;color:var(--history-amount-dark)}.history-item{align-items:flex-start;background:var(--history-bg-light);border:2px solid #e0d7f7;border:2px solid var(--history-border-light);border-radius:1.2rem;box-shadow:0 2px 14px 0 #ae58fe0f;margin-bottom:1.1rem;padding:1.1rem 1.4rem 1.1rem 1.1rem;transition:box-shadow .17s,transform .13s,background .2s,border-color .2s}.history-item:hover{background:linear-gradient(90deg,#f8f4ff 60%,#f5e6ff);border-color:#ae58fe;border-color:#d1c4e9;box-shadow:0 4px 22px 0 #ae58fe21;box-shadow:0 4px 22px 0 #ae58fe2e;transform:translateY(-2px) scale(1.025)}.item-icon{font-size:2.1rem;margin-right:1.05rem;margin-top:.15rem}.item-header{align-items:center}.item-title{color:#7c4dff;font-size:1.19rem;font-weight:700;letter-spacing:.01em;margin:.05rem 0 .14rem}.item-category{color:#ae58fe;font-size:.97rem;letter-spacing:.02em;margin-bottom:.11rem}.item-status{font-size:1.12rem;margin-left:.6rem}.item-meta{color:#5e5c77;font-size:.97rem;gap:1.1rem;margin-bottom:.13rem}.item-date-activity,.item-date-created{gap:.15rem}.guest-badge{background:#fae4ec;border-radius:.7rem;color:#ae58fe;font-size:.89rem;font-weight:600;margin-left:.5rem;padding:.13rem .7rem}.item-stats{align-items:center;font-size:1.02rem;gap:1.2rem;margin-top:.12rem}.expenses-count{color:#6c78be;font-weight:600}.total-amount{color:#43b97f;font-weight:700}@media (max-width:600px){.history-item{border-radius:.9rem;padding:.8rem .7rem}.item-title{font-size:1.03rem}.item-category{font-size:.86rem}.item-meta,.item-stats{font-size:.87rem}}.about-page{background:#fafaffbf;border-radius:2.2rem;box-shadow:0 4px 28px 0 #815cb61a;margin:2.3rem auto 0;max-width:370px;padding:2rem 1.4rem}.about-photo{background:linear-gradient(120deg,#ae58fe,#fa71cd 80%,#ffb8c6) border-box;background-clip:padding-box,border-box;background-origin:border-box;border:5px solid #0000;border-radius:50%;box-shadow:0 3px 18px #ae58fe21;display:block;height:110px;margin-bottom:1rem;object-fit:cover;padding:3px;width:110px}.about-app-title{background:linear-gradient(93deg,#ae58fe,#fa71cd 80%,#ffb8c6);background-clip:text;-webkit-background-clip:text;color:#0000;font-family:Montserrat,Inter,Arial,sans-serif;font-size:2.1rem;font-weight:800;letter-spacing:.04em;margin-bottom:.35rem;position:relative}.about-divider{background:linear-gradient(92deg,#fce4ec 20%,#ae58fe 50%,#e1bee7);border-radius:22px;height:.19rem;margin:.8rem auto 1.2rem;min-width:120px;width:54%}.about-heading{color:#906ccf;font-family:Montserrat,Inter,Arial,sans-serif;font-size:1.25rem;font-weight:700;letter-spacing:.015em;margin-bottom:.5rem}.about-origin{color:#444b5d;font-size:1.05rem;font-weight:500;line-height:1.4;margin-bottom:.95rem}.about-bio{color:#5e5c77;font-family:Inter,Montserrat,Arial,sans-serif;font-size:1.08rem;line-height:1.7;margin-bottom:1.1rem}.about-name{background:linear-gradient(94deg,#ae58fe,#fa71cd 80%);background-clip:text;-webkit-background-clip:text;color:#ae58fe;color:#0000;font-weight:700}.about-role{color:#6c78be;font-weight:600}.about-key{color:#fa71cd;font-style:italic}.social-link{background:#fff;border:2px solid #ae58fe;border-radius:1.4rem;box-shadow:0 2px 12px #ae58fe17;color:#ae58fe;display:inline-block;font-family:Montserrat,Arial,sans-serif;font-size:1.12rem;font-weight:700;margin:.7rem 0 .17rem;padding:.7rem 1.45rem;text-decoration:none;transition:background .22s,color .22s,box-shadow .21s}.social-link:hover{background:#ae58fe;box-shadow:0 2px 18px 0 #ae58fe1c;color:#fff}.help-btn{background:#ede7f6;border:none;border-radius:1.2rem;box-shadow:0 2px 10px #8c6eff12;color:#7c4dff;display:inline-block;font-family:Montserrat,Arial,sans-serif;font-size:1.07rem;font-weight:600;margin:.55rem 0 0;padding:.65rem 1.1rem;text-decoration:none;transition:background .18s,color .16s}.help-btn:hover{background:#d1c4e9;color:#4b2c7e}@media only screen and (max-width:480px){.about-page{border-radius:1.3rem;padding:1.3rem .4rem}}:root{--bg-gradient:linear-gradient(145deg,#e8eaf6 60%,#b2ebf2);--home-bg:linear-gradient(135deg,#f5f7fa,#e4e8eb);--text-primary:#2d3748;--text-secondary:#4a5568;--text-tertiary:#718096;--card-bg:#fff;--card-shadow:#3151b012;--card-hover-shadow:#7e57c221;--error-bg:#ffe6e6;--error-text:#f44;--form-border:#e0e0e0;--form-bg:#f5f5f5;--divider:#f0f0f0}[data-theme=dark]{--bg-gradient:linear-gradient(145deg,#1a202c 60%,#2d3748);--home-bg:linear-gradient(135deg,#1a202c,#2d3748);--text-primary:#e2e8f0;--text-secondary:#cbd5e0;--text-tertiary:#a0aec0;--card-bg:#2d3748;--card-shadow:#0003;--card-hover-shadow:#7e57c24d;--error-bg:#742a2a;--error-text:#feb2b2;--form-border:#4a5568;--form-bg:#2d3748;--divider:#4a5568}*{box-sizing:border-box;margin:0;padding:0}body{background:linear-gradient(145deg,#e8eaf6 60%,#b2ebf2);background:var(--bg-gradient);color:#2d3748;color:var(--text-primary);transition:background .3s ease,color .3s ease}.home-page{background:linear-gradient(135deg,#f5f7fa,#e4e8eb);background:var(--home-bg);font-family:Inter,sans-serif;justify-content:center;min-height:100vh;padding:2rem;transition:background .3s ease}.content-container,.home-page{align-items:center;display:flex}.content-container{flex-direction:column;gap:1.5rem;max-width:370px;padding:2rem 1rem;width:100%}.app-logo{animation:float 3s ease-in-out infinite;border-radius:16px;cursor:pointer;filter:drop-shadow(0 4px 12px rgba(0,0,0,.1));height:auto;margin-bottom:1rem;transition:all .3s cubic-bezier(.4,0,.2,1);width:200px}@keyframes float{0%{transform:translateY(0)}50%{transform:translateY(-10px)}to{transform:translateY(0)}}.app-logo:hover{filter:drop-shadow(0 12px 20px rgba(126,87,194,.2))}.home-heading{margin-bottom:1rem;text-align:center}.home-heading h2{color:#2d3748;color:var(--text-primary);font-size:1.5rem;font-weight:700;margin-bottom:.5rem}.home-heading h2,.home-heading h3{font-family:Montserrat,sans-serif;transition:color .3s ease}.home-heading h3{color:#4a5568;color:var(--text-secondary);font-size:1.2rem;font-weight:600}.main-btn{border:none;border-radius:16px;color:#fff;cursor:pointer;font-family:Montserrat,sans-serif;font-size:1.1rem;font-weight:600;padding:1rem 1.5rem;transition:all .2s cubic-bezier(.4,0,.2,1);width:100%}.main-btn:not(.secondary):not(.tertiary){background:#48a8f8;box-shadow:0 4px 15px #48a8f833}.main-btn:not(.secondary):not(.tertiary):hover{background:#3999f0;box-shadow:0 6px 20px #48a8f84d;transform:translateY(-2px)}.main-btn.secondary{background:#49e6a4;box-shadow:0 4px 15px #49e6a433}.main-btn.secondary:hover{background:#3dd696;box-shadow:0 6px 20px #49e6a44d;transform:translateY(-2px)}.main-btn.tertiary{background:#fff;background-clip:padding-box,border-box;background-image:linear-gradient(#fff,#fff),linear-gradient(135deg,#7e57c2,#b39ddb 50%,#7e57c2);background-origin:border-box;border:2px solid #0000;box-shadow:0 4px 15px #7e57c226,inset 0 0 15px #7e57c20d;color:#7e57c2}.main-btn.tertiary:hover{background-image:linear-gradient(#fff,#fff),linear-gradient(135deg,#9575cd,#b39ddb 50%,#9575cd);box-shadow:0 6px 20px #7e57c240,inset 0 0 20px #7e57c21a;transform:translateY(-2px)}.button-group{display:flex;flex-direction:column;gap:1rem;width:100%}.footer-text{color:#718096;color:var(--text-tertiary);font-family:Inter,sans-serif;font-size:.9rem;font-style:italic;line-height:1.5;margin-top:1.5rem;text-align:center;transition:color .3s ease}.dashboard{align-items:center;background:none;display:flex;flex-direction:column;font-family:Nunito,Quicksand,Arial,sans-serif;justify-content:flex-start;min-height:100vh;padding:2rem 1rem 1rem}.dashboard-title{color:#49667e;font-size:1.6rem;font-weight:700;margin-bottom:2rem;text-align:center}.guest-banner{background:#fffde7;border-radius:1.2rem;box-shadow:0 2px 12px #ffecb32e;color:#7e57c2;font-size:1.08rem;font-weight:600;margin-bottom:1.5rem;padding:.9rem 1.5rem;text-align:center}.option-cards{display:flex;flex-wrap:wrap;gap:1.5rem;justify-content:center;max-width:700px;width:100%}.option-card{align-items:center;background:#fff;background:var(--card-bg);border-radius:1.5rem;box-shadow:0 2px 16px #3151b012;box-shadow:0 2px 16px var(--card-shadow);cursor:pointer;display:flex;flex:1 1 220px;flex-direction:column;margin-bottom:1rem;max-width:270px;min-width:220px;padding:2rem 1.5rem 1.5rem;transition:box-shadow .2s,transform .2s,background .3s ease}.option-card:hover{box-shadow:0 6px 28px #7e57c221;box-shadow:0 6px 28px var(--card-hover-shadow);transform:translateY(-4px) scale(1.03)}.option-emoji{font-size:2.2rem;margin-bottom:.7rem}.option-title{color:#2d3748;color:var(--text-primary);font-size:1.18rem;font-weight:700;margin-bottom:.4rem;transition:color .3s ease}.option-subtitle{color:#4a5568;color:var(--text-secondary);font-size:1.01rem;margin-bottom:.2rem;text-align:center;transition:color .3s ease}.about-page{align-items:center;display:flex;flex-direction:column;font-family:Nunito,Quicksand,Arial,sans-serif;justify-content:center;min-height:100vh;padding:2rem 1rem;text-align:center}.about-story{color:#7e57c2;font-size:1.18rem;font-weight:700;margin-bottom:1.2rem}.about-desc{color:#49667e;font-size:1.07rem;margin-bottom:2rem;max-width:400px}.contact-link{color:#00bfae;font-weight:600;text-decoration:underline}.trip-screen{margin:0 auto;max-width:800px;padding:20px}.trip-screen header{margin-bottom:30px;position:relative;text-align:center}.type-badge{background:#7e57c2;border-radius:12px;color:#fff;display:inline-block;font-size:.8rem;font-weight:600;letter-spacing:.5px;margin-top:5px;padding:4px 10px;text-transform:uppercase}.error-message{border-radius:4px;margin-bottom:15px;padding:10px;transition:background .3s ease,color .3s ease}.trip-content{grid-gap:20px;display:grid;gap:20px;grid-template-columns:300px 1fr}.expense-form-section{background:#fff;background:var(--card-bg);border-radius:12px;box-shadow:0 2px 16px #3151b012;box-shadow:0 2px 16px var(--card-shadow);margin-bottom:20px;padding:20px;transition:background .3s ease,box-shadow .3s ease}.expense-form{display:flex;flex-direction:column;gap:12px}.expense-form input,.expense-form select{background-color:#fff;background-color:var(--card-bg);border:1px solid #e0e0e0;border:1px solid var(--form-border);border-radius:8px;color:#2d3748;color:var(--text-primary);font-family:inherit;font-size:1rem;padding:12px;transition:background .3s ease,color .3s ease,border .3s ease}.shared-by-section{background:#f5f5f5;background:var(--form-bg);border-radius:8px;padding:12px;transition:background .3s ease}.checkbox-label{align-items:center;display:flex;gap:8px;margin:8px 0}.member-list-section{background:#fff;background:var(--card-bg);border-radius:12px;box-shadow:0 2px 16px #3151b012;box-shadow:0 2px 16px var(--card-shadow);margin-bottom:20px;padding:20px;transition:background .3s ease,box-shadow .3s ease}.member-item{align-items:center;border-bottom:1px solid #f0f0f0;border-bottom:1px solid var(--divider);display:flex;gap:8px;padding:8px 0;transition:border-color .3s ease}.member-avatar{font-size:1.2rem}.member-email{color:#718096;color:var(--text-tertiary);font-size:.9rem;transition:color .3s ease}.expense-list-section{background:#fff;background:var(--card-bg);border-radius:12px;box-shadow:0 2px 16px #3151b012;box-shadow:0 2px 16px var(--card-shadow);margin-bottom:20px;padding:20px;transition:background .3s ease,box-shadow .3s ease}.expense-item{grid-gap:15px;border-bottom:1px solid #f0f0f0;border-bottom:1px solid var(--divider);display:grid;gap:15px;grid-template-columns:auto 1fr auto;padding:12px 0;transition:border-color .3s ease}.expense-date{color:#718096;color:var(--text-tertiary);font-size:.9rem;transition:color .3s ease}.expense-note{color:#2d3748;color:var(--text-primary);font-weight:600;transition:color .3s ease}.expense-payer{color:#718096;color:var(--text-tertiary);font-size:.9rem;transition:color .3s ease}.expense-amount{color:#00bfae;font-weight:600}.balance-sheet-section{background:#fff;background:var(--card-bg);border-radius:12px;box-shadow:0 2px 16px #3151b012;box-shadow:0 2px 16px var(--card-shadow);margin-bottom:20px;padding:20px;transition:background .3s ease,box-shadow .3s ease}.balance-item{align-items:center;border-bottom:1px solid #f0f0f0;border-bottom:1px solid var(--divider);display:flex;justify-content:space-between;padding:12px 0;transition:border-color .3s ease}.balance-item.positive .balance-amount{color:#00bfae}.balance-item.negative .balance-amount{color:#f44}.member-info{align-items:center;display:flex;gap:8px}.share-trip-section{background:#fff;background:var(--card-bg);border-radius:12px;box-shadow:0 2px 16px #3151b012;box-shadow:0 2px 16px var(--card-shadow);margin-bottom:20px;padding:20px;transition:background .3s ease,box-shadow .3s ease}.share-notice{color:#718096;color:var(--text-tertiary);cursor:pointer;font-style:italic;padding:10px;text-align:center;transition:color .3s ease}.share-content{display:flex;flex-direction:column;gap:15px}.share-code-box{align-items:center;background:#f5f5f5;background:var(--form-bg);border-radius:8px;display:flex;gap:10px;padding:10px;transition:background .3s ease}.share-code-box code{color:#7e57c2;font-size:1.2rem;font-weight:600;letter-spacing:1px}.share-link-box{display:flex;gap:10px}.share-link-box input{background-color:#fff;background-color:var(--card-bg);border:1px solid #e0e0e0;border:1px solid var(--form-border);border-radius:8px;color:#2d3748;color:var(--text-primary);flex:1 1;font-family:inherit;padding:10px;transition:background .3s ease,color .3s ease,border .3s ease}.copy-btn{background:#7e57c2;border-radius:20px;color:#fff;font-size:.9rem;min-width:80px;padding:8px 16px}.copy-btn:hover{transform:translateY(-2px)}.join-trip-screen{align-items:center;background:linear-gradient(135deg,#f5f7fa,#e4e8eb);background:var(--home-bg);display:flex;flex-direction:column;justify-content:center;min-height:100vh;padding:20px;text-align:center;transition:background .3s ease}.loading-spinner{color:#7e57c2;font-size:1.2rem;margin-bottom:20px}.join-trip-screen .main-btn{background:#00bfae;border-radius:25px;color:#fff;font-weight:600;margin-top:20px;padding:12px 24px;transition:transform .2s}.join-trip-screen .main-btn:hover{transform:translateY(-2px)}.login-error{background:#ffe6e6;border-radius:8px;color:#f44;font-size:.9rem;margin:10px 0;padding:12px;text-align:center}.login-button{background:#7e57c2;border:none;border-radius:25px;color:#fff;cursor:pointer;font-weight:600;padding:12px 24px;transition:all .2s ease}.login-button:hover{background:#6a3fb5;box-shadow:0 4px 12px #7e57c233;transform:translateY(-2px)}.app-title{-webkit-text-fill-color:#0000;animation:glitter 6s linear infinite;background:linear-gradient(135deg,#7e57c2,#b39ddb 50%,#7e57c2);-webkit-background-clip:text;background-clip:text;font-family:Montserrat,sans-serif;font-size:2.5rem;font-weight:800;overflow:hidden;position:relative}.app-title:after{animation:shine 3s ease-in-out infinite;background:linear-gradient(90deg,#0000,#fff6,#0000);content:"";height:100%;left:-100%;position:absolute;top:0;transform:skewX(-25deg);width:50%}@keyframes shine{0%{left:-100%}20%{left:100%}to{left:100%}}@keyframes glitter{0%{background-position:0 0}50%{background-position:400% 0}to{background-position:0 0}}@media (max-width:480px){.app-logo:hover{transform:translateY(-4px) scale(1.01)}.main-btn{font-size:1rem;padding:1.1rem 1.5rem}.login-button{font-size:1.1rem;padding:16px 24px;width:100%}}.loading-spinner-container{align-items:center;display:flex;flex-direction:column;justify-content:center;padding:2rem;text-align:center}.loading-spinner-container p{color:#7e57c2;font-weight:500;margin-top:1rem}.loading-spinner{animation:spin 1s ease-in-out infinite;border:3px solid #7e57c24d;border-top-color:#7e57c2;display:inline-block;height:50px;width:50px}.toast-notification{align-items:center;animation:slideIn .3s ease-out forwards;background-color:#fff;background-color:var(--card-bg);border-radius:8px;bottom:20px;box-shadow:0 4px 12px #00000026;color:#2d3748;color:var(--text-primary);display:flex;justify-content:space-between;max-width:350px;min-width:250px;padding:12px 16px;position:fixed;right:20px;transition:background .3s ease,color .3s ease;z-index:1000}.toast-notification.success{border-left:4px solid #49e6a4}.toast-notification.error{border-left:4px solid #ff5252}.toast-notification.info{border-left:4px solid #48a8f8}.toast-content,.toast-icon{align-items:center;display:flex}.toast-icon{border-radius:50%;font-size:18px;height:24px;justify-content:center;margin-right:12px;width:24px}.success .toast-icon{color:#49e6a4}.error .toast-icon{color:#ff5252}.info .toast-icon{color:#48a8f8}.toast-close{background:none;border:none;color:#718096;color:var(--text-tertiary);cursor:pointer;font-size:20px;margin-left:8px;padding:0;transition:color .3s ease}.toast-close:hover{color:#2d3748;color:var(--text-primary)}@keyframes slideIn{0%{opacity:0;transform:translateX(100%)}to{opacity:1;transform:translateX(0)}}@media (max-width:600px){.option-cards{flex-direction:column;gap:1rem}.option-card{max-width:98vw;min-width:90vw;padding:1.3rem .7rem 1.1rem}}@media (max-width:768px){.trip-content{grid-template-columns:1fr}.share-link-box{flex-direction:column}}.theme-toggle{align-items:center;background:#fff;background:var(--card-bg);border:none;border-radius:50%;box-shadow:0 2px 10px #3151b012;box-shadow:0 2px 10px var(--card-shadow);cursor:pointer;display:flex;height:40px;justify-content:center;position:fixed;right:20px;top:20px;transition:background .3s ease,transform .2s ease;width:40px;z-index:100}.theme-toggle:hover{transform:scale(1.1)}.theme-toggle svg{fill:#2d3748;fill:var(--text-primary);height:24px;transition:fill .3s ease;width:24px}.user-header{align-items:center;background:#fff;background:var(--card-bg);border-radius:12px;box-shadow:0 2px 8px #3151b012;box-shadow:0 2px 8px var(--card-shadow);display:flex;justify-content:space-between;margin-bottom:2rem;padding:1rem}.welcome-message{color:#2d3748;color:var(--text-primary);font-size:1.1rem;font-weight:600}.header-actions{display:flex;gap:.5rem}.history-btn,.logout-btn{border:none;border-radius:8px;cursor:pointer;font-size:.9rem;font-weight:500;padding:.5rem 1rem;transition:all .2s ease}.history-btn{background:linear-gradient(135deg,#667eea,#764ba2);color:#fff}.history-btn:hover{box-shadow:0 4px 12px #667eea4d;transform:translateY(-1px)}.logout-btn{background:#f5f5f5;background:var(--form-bg);border:1px solid #e0e0e0;border:1px solid var(--form-border);color:#4a5568;color:var(--text-secondary)}.logout-btn:hover{background:#ff6b6b;border-color:#ff6b6b;color:#fff}.auth-container{margin:0 auto;max-width:400px;padding:2rem;text-align:center}.error-message{background:#ffe6e6;background:var(--error-bg);border:1px solid #f443;border-radius:8px;color:#f44;color:var(--error-text);font-size:.9rem;margin:1rem 0;padding:.75rem}.user-history{margin:0 auto;max-width:800px;padding:1rem}.user-history.empty,.user-history.loading{padding:3rem;text-align:center}.empty-state{margin:0 auto;max-width:400px}.empty-icon{font-size:4rem;margin-bottom:1rem;opacity:.6}.empty-state h3{color:#2d3748;color:var(--text-primary);font-size:1.5rem;margin-bottom:.5rem}.empty-state p{color:#4a5568;color:var(--text-secondary);line-height:1.6;margin-bottom:2rem}.empty-hint{color:#718096!important;color:var(--text-tertiary)!important;font-size:.9rem!important;font-style:italic;margin-bottom:0!important}.history-header{align-items:center;display:flex;justify-content:space-between;margin-bottom:2rem}.history-header h2{color:#2d3748;color:var(--text-primary);font-size:1.8rem;font-weight:700}.tab-buttons{display:flex;gap:.5rem}.tab-btn{background:#f5f5f5;background:var(--form-bg);border:none;border-radius:8px;color:#4a5568;color:var(--text-secondary);cursor:pointer;font-weight:500;padding:.5rem 1rem;transition:all .2s 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