:root{font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;color:#253238;background:#eef3f4;line-height:1.35;--ink:#253238;--muted:#87959a;--line:#e7edef;--teal:#23b9b1;--teal-dark:#087f82;--mint:#d8f4e9;--yellow:#ffe67b;--navy:#17262e}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-weight:400;background:linear-gradient(180deg,#edf3f4 0%,#f7f9f9 58%,#eef3f4 100%)}
button,input,select{font:inherit}
button,a{ -webkit-tap-highlight-color:transparent}
.app-shell{width:min(100%,760px);margin:0 auto;padding:1.25rem 1.1rem 3rem}
.hidden{display:none!important}
.card{border:1px solid #fff;border-radius:28px;padding:1.25rem;margin:1rem 0;background:#fff;box-shadow:0 16px 40px #5c737b17}
.eyebrow{margin:0 0 .35rem;color:#8a999d;font-size:.68rem;letter-spacing:.14em;font-weight:400}
h1,h2,h3,p{margin-top:0}h1,h2,h3{font-weight:700}
h1{letter-spacing:-.055em}
h2{letter-spacing:-.035em}
.muted{color:var(--muted)}
.account-line{margin:-.25rem 0 .65rem;color:#829096;font-size:.78rem}
.login-screen{min-height:calc(100vh - 2.5rem);display:grid;align-content:center;gap:1.5rem}
.login-brand,.brand-lockup{display:flex;align-items:center;gap:.7rem;font-weight:400;letter-spacing:-.03em}
.login-brand{font-size:1.35rem;justify-content:center}
.login-card{padding:1.5rem}
.login-card h1{font-size:2.1rem;line-height:1.02;margin:.6rem 0 .8rem}
.topbar{display:flex;justify-content:space-between;align-items:flex-start;gap:1rem;padding:.25rem 0 1rem}.topbar h1{margin:.1rem 0;font-size:1.8rem}.topbar>.muted{margin:0}.app-header{display:flex;justify-content:space-between;align-items:center;padding:0}
.brand-lockup h1{font-size:1.35rem;margin:0}
.header-actions,.actions{display:flex;gap:.55rem;align-items:center}
.icon-button{display:grid;place-items:center;width:2.55rem;height:2.55rem;border:0;border-radius:50%;background:#fff;color:var(--ink);cursor:pointer;box-shadow:0 7px 20px #5c737b16;text-decoration:none}
.header-icon{font-size:1.05rem}
.balance-hero{position:relative;overflow:hidden;margin:.6rem 0 .7rem;padding:.7rem 1.35rem;border-radius:30px;color:#fff;background:linear-gradient(125deg,#19b7b2 0%,#46d1b6 48%,#ffe37a 125%);box-shadow:0 18px 38px #1a9f9d40}
.balance-glow{position:absolute;width:13rem;height:13rem;right:-4rem;top:-7rem;border-radius:50%;background:#fff8;filter:blur(28px)}
.balance-hero>*{position:relative}
.balance-hero-top{display:flex;justify-content:space-between;align-items:center}
.balance-hero .eyebrow{color:#e8ffff}
.balance-status{padding:.2rem .5rem;border-radius:99px;background:#ffffff30;font-size:.62rem;font-weight:400;letter-spacing:.1em}
.balance-hero strong{display:block;margin:.15rem 0;font-size:2.2rem;letter-spacing:-.065em;font-weight:400}
.balance-hero>span:not(.balance-status):not(.eyebrow){color:#eafff6;font-size:.9rem}
.hero-action{display:flex;align-items:center;gap:.5rem;width:100%;margin-top:.65rem;padding:.45rem .65rem;border:0;border-radius:16px;background:#17262e;color:#fff;font-weight:400;cursor:pointer}
.hero-action span:nth-child(2){flex:1;text-align:left}
.icon-circle{display:grid;place-items:center;width:1.4rem;height:1.4rem;border-radius:50%;background:#ffffff22}
.section-heading,.layer-header,.range-heading{display:flex;justify-content:space-between;align-items:center;gap:1rem}
.section-heading h2,.layer-header h2{margin:0;font-size:1.2rem}
.section-icon{display:grid;place-items:center;width:2.55rem;height:2.55rem;border-radius:50%;background:#e9faf4;color:#0b8d86;font-size:1.3rem}
label{display:flex;flex-direction:column;gap:.4rem;margin:.85rem 0;font-size:.82rem;font-weight:400;color:#526269}
input,select{width:100%;border:1px solid var(--line);border-radius:15px;padding:.82rem .9rem;background:#f8fbfb;color:var(--ink);outline:none}
.field-help{display:block;color:var(--muted);font-size:.72rem;font-weight:400}
input:focus,select:focus{border-color:var(--teal);box-shadow:0 0 0 4px #23b9b126}
.grid{display:grid;grid-template-columns:1fr 1fr;gap:.8rem}
.split-always{margin:1.15rem 0;padding:1rem;border-radius:20px;background:#f2f8f7}
.range-heading{font-weight:400}
.range-heading output{color:#688087;font-size:.82rem}
input[type=range]{display:block;height:1.45rem;padding:0;border:0;background:transparent;accent-color:var(--teal)}
.shares{display:grid;grid-template-columns:1fr 1fr;gap:.6rem;margin-top:.65rem}
.shares span{display:flex;flex-direction:column;gap:.15rem;padding:.75rem;border-radius:15px;background:#fff}
.shares b{font-size:.84rem;font-weight:400}.shares small{color:#9aa9ad}
.button{display:inline-flex;align-items:center;justify-content:center;gap:.45rem;border:0;border-radius:15px;padding:.82rem 1.1rem;font-weight:400;cursor:pointer;text-decoration:none;transition:transform .15s ease,opacity .15s ease}
.button:active{transform:scale(.97)}.button:disabled{opacity:.4;cursor:not-allowed}
.button-primary{background:var(--teal);color:#fff;box-shadow:0 9px 20px #23b9b133}
.button-secondary,.button-light{background:#f0f6f6;color:var(--ink);box-shadow:none}
.button-dark{background:var(--navy);color:#fff}
.full{width:100%}.expense-card #detailsButton{margin-bottom:1.25rem}
.disclosure-card{padding:0;overflow:hidden}
.disclosure-summary{display:flex;justify-content:space-between;align-items:center;gap:1rem;padding:1.2rem;cursor:pointer;list-style:none}
.disclosure-summary::-webkit-details-marker{display:none}
.disclosure-summary h2{margin:0;font-size:1.08rem;font-weight:700}
.disclosure-icon{display:grid;place-items:center;width:2.55rem;height:2.55rem;border-radius:50%;background:#eef8f6;color:#168f88;font-size:1.35rem;line-height:1}
.disclosure-icon::before{content:"⌄";transform:translateY(-.1rem)}
.disclosure-card[open] .disclosure-icon::before{content:"×";font-size:1.7rem;transform:none}
.details-content{padding:0 1.2rem 1.2rem}
.timeline-card{scroll-margin-top:1rem}
.timeline-day{padding:1rem .1rem .45rem;color:#87969a;font-size:.72rem;font-weight:400;text-transform:uppercase;letter-spacing:.12em}
.timeline-day:first-child{padding-top:.35rem}
.transaction-item{display:flex;align-items:flex-start;gap:.75rem;padding:1rem .1rem;border-top:1px solid var(--line)}
.transaction-icon{flex:none;display:grid;place-items:center;width:2.45rem;height:2.45rem;border-radius:50%;font-weight:400}
.expense-icon{background:#e8f8f2;color:#0c9b87}.settlement-icon{background:#fff4d4;color:#b78300}
.transaction-main{min-width:0;flex:1}.transaction-main strong{display:block;font-size:.92rem;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.transaction-main strong,.transaction-amount{font-weight:400}.transaction-main small{display:block;margin:.25rem 0;color:#8d9da1;font-size:.72rem}
.transaction-amount{white-space:nowrap;padding-top:.2rem;font-size:.86rem}
.amount-expense{color:#27353a}.amount-settlement{color:#0b9a85}
.item-actions{display:flex;gap:.65rem;margin-top:.5rem}
.text-button{padding:0;border:0;background:none;color:#4d8587;font-size:.72rem;font-weight:400;cursor:pointer}.danger-text{color:#cf6b66}
.empty-state{text-align:center;padding:1.5rem 0}
.timeline-loader,.timeline-end{text-align:center;padding:.9rem;font-size:.82rem}
.layer{position:fixed;inset:0;z-index:10;display:flex;align-items:center;justify-content:center;padding:1rem;background:#17262e88}
.layer-panel{width:min(600px,100%);max-height:90vh;overflow:auto;border-radius:28px;padding:1.25rem;background:#fff;box-shadow:0 24px 70px #17262e55}
.msg{min-height:1.2rem}.toast:empty{display:none}
.toast{position:fixed;left:50%;bottom:5.3rem;z-index:20;transform:translateX(-50%);padding:.75rem 1rem;border-radius:999px;background:var(--navy);color:#fff;box-shadow:0 8px 24px #0003}
hr{border:0;border-top:1px solid var(--line);margin:1.2rem 0}
.tabs{display:flex;gap:.4rem;overflow:auto;margin:-.2rem -.2rem 1.2rem;padding:.2rem}
.tabs button{border:0;border-radius:999px;padding:.65rem .9rem;background:#f0f6f6;color:#728286;font-weight:400;cursor:pointer;white-space:nowrap}
.tabs button.active{background:var(--teal);color:#fff}
.row strong{font-weight:400}.row{padding:1rem 0;border-top:1px solid var(--line)}.row:first-child{border-top:0}.row strong{display:block}.row small{display:block;margin:.25rem 0;color:var(--muted)}.row .actions{margin-top:.65rem;flex-wrap:wrap}
.danger{background:#fff0ef;color:#b7534d}
@media(max-width:560px){.app-shell{padding:.85rem .75rem 3rem}.grid{grid-template-columns:1fr}.balance-hero strong{font-size:2rem}.card{border-radius:24px}.header-actions>*{width:2.35rem;height:2.35rem}}
@media(min-width:800px){.app-shell{padding-top:2rem}}