:root {
  color-scheme: light;
  --accent: #b54718;
  --accent-hover: #963811;
  --accent-soft: #fff1e9;
  --ink: #202b35;
  --muted: #5e6873;
  --surface: #ffffff;
  --canvas: #f5f6f8;
  --line: #dce0e5;
  --control-border: #89939e;
  --danger: #b42332;
  --success: #236448;
  --focus: #a13e14;
  --scrollbar-thumb: #89939e;
  --scrollbar-track: #eef0f3;
  --scrollbar-hover: #5e6873;
  --scrollbar-active: #202b35;
  --radius-control: 10px;
  --radius-panel: 16px;
  --bs-body-font-family: "Segoe UI", system-ui, -apple-system, sans-serif;
  --bs-body-bg: var(--canvas);
  --bs-body-color: var(--ink);
  --bs-secondary-color: var(--muted);
  --bs-primary: var(--accent);
  --bs-primary-rgb: 181, 71, 24;
  --bs-border-color: var(--line);
  --bs-border-radius: var(--radius-control);
}
* { scrollbar-width: thin; scrollbar-color: var(--scrollbar-thumb) var(--scrollbar-track); }
*::-webkit-scrollbar { width: 10px; height: 10px; }
*::-webkit-scrollbar-track { background: var(--scrollbar-track); }
*::-webkit-scrollbar-thumb { background: var(--scrollbar-thumb); border-radius: 6px; border: 2px solid var(--scrollbar-track); }
*::-webkit-scrollbar-thumb:hover { background: var(--scrollbar-hover); }
*::-webkit-scrollbar-thumb:active { background: var(--scrollbar-active); }
[hidden] { display: none !important; }
body { min-height: 100dvh; font-size: 16px; line-height: 1.5; }
::selection { background: #f8d5c3; color: var(--ink); }
:focus-visible { outline: 3px solid var(--focus); outline-offset: 4px; }
input { caret-color: var(--accent); }
button, a, select, .form-check-input, .checkbox-option { cursor: pointer; }
button:disabled, input:disabled { cursor: not-allowed; }
a { color: var(--accent); text-underline-offset: 4px; }
.page-width { width: min(1120px, calc(100% - 64px)); margin-inline: auto; }
.site-header { height: 96px; display: flex; align-items: center; justify-content: space-between; border-bottom: 1px solid var(--line); gap: 24px; }
.brand { display: inline-flex; align-items: center; gap: 12px; color: var(--ink); text-decoration: none; font-size: 24px; font-weight: 750; letter-spacing: -.035em; }
.brand:hover { color: var(--accent); }
.brand-mark { font-size: 25px; letter-spacing: -12px; padding-right: 12px; white-space: nowrap; }
.header-note { color: var(--muted); font-size: 14px; }
.skip-link { position: fixed; left: 16px; top: 12px; z-index: 2000; width: 1px; height: 1px; overflow: hidden; clip-path: inset(50%); background: var(--surface); border-radius: var(--radius-control); }
.skip-link:focus { width: auto; height: auto; overflow: visible; clip-path: none; padding: 12px 20px; }
h1, h2, p { margin: 0; }
h1 { font-weight: 750; letter-spacing: -.035em; line-height: 1.12; overflow-wrap: anywhere; }
h2 { font-size: 20px; font-weight: 700; letter-spacing: -.02em; }
.icon { width: 20px; height: 20px; flex-shrink: 0; fill: currentColor; vertical-align: -.15em; }
.welcome { display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr); gap: 80px; align-items: center; padding: 96px 0 80px; }
.welcome h1 { font-size: clamp(42px, 4.8vw, 66px); }
.welcome h1 span { color: var(--accent); }
.welcome-description { max-width: 440px; margin-top: 24px; color: var(--muted); font-size: 18px; line-height: 1.65; }
.welcome-steps { list-style: none; padding: 0; margin: 36px 0 0; counter-reset: steps; display: grid; gap: 14px; }
.welcome-steps li { display: flex; gap: 12px; align-items: center; font-size: 15px; counter-increment: steps; }
.welcome-steps li::before { content: counter(steps); display: grid; place-items: center; width: 27px; height: 27px; border: 1px solid var(--line); color: var(--muted); border-radius: 50%; font-size: 12px; font-weight: 600; flex-shrink: 0; }
.welcome-panel { padding: 36px; background: var(--surface); border-radius: var(--radius-panel); box-shadow: 0 12px 40px #202b350a; }
.welcome-panel h2 { font-size: 24px; margin-bottom: 10px; }
.welcome-panel form { margin-top: 28px; }
.welcome-panel .btn { width: 100%; justify-content: space-between; }
.welcome-hint { display: flex; gap: 8px; margin-top: 24px; font-size: 13px; color: var(--muted); line-height: 1.6; }
.welcome-hint .icon { margin-top: 2px; }
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; min-height: 44px; padding: 10px 18px; font-size: 14px; font-weight: 600; border-radius: var(--radius-control); transition: background-color .16s, border-color .16s, color .16s; position: relative; }
.btn-sm { min-height: 40px; padding: 8px 12px; font-size: 13px; }
.btn-primary { --bs-btn-color: #fff; --bs-btn-bg: var(--accent); --bs-btn-border-color: var(--accent); --bs-btn-hover-bg: var(--accent-hover); --bs-btn-hover-border-color: var(--accent-hover); --bs-btn-active-bg: var(--accent-hover); --bs-btn-active-border-color: var(--accent-hover); --bs-btn-disabled-bg: var(--accent); --bs-btn-disabled-border-color: var(--accent); }
.btn-outline-primary { --bs-btn-color: var(--accent); --bs-btn-border-color: var(--accent); --bs-btn-hover-color: var(--accent); --bs-btn-hover-bg: var(--accent-soft); --bs-btn-hover-border-color: var(--accent); --bs-btn-active-bg: var(--accent-soft); --bs-btn-active-color: var(--accent); }
.btn-secondary, .btn-outline-secondary { --bs-btn-color: var(--ink); --bs-btn-bg: var(--surface); --bs-btn-border-color: var(--line); --bs-btn-hover-color: var(--ink); --bs-btn-hover-bg: #eef0f3; --bs-btn-hover-border-color: var(--control-border); --bs-btn-active-bg: #e5e8ed; --bs-btn-active-color: var(--ink); --bs-btn-active-border-color: var(--control-border); }
.btn-danger { --bs-btn-bg: var(--danger); --bs-btn-border-color: var(--danger); }
.btn-outline-danger { --bs-btn-color: var(--danger); --bs-btn-border-color: var(--line); --bs-btn-hover-bg: var(--danger); --bs-btn-hover-border-color: var(--danger); }
.btn:focus-visible, .form-control:focus, .form-select:focus, .form-check-input:focus { outline: 3px solid var(--focus); outline-offset: 3px; box-shadow: none; border-color: var(--focus); }
.btn[aria-busy="true"] { color: transparent !important; }
.btn[aria-busy="true"]::after { content: ""; position: absolute; width: 18px; height: 18px; inset: calc(50% - 9px); border: 2px solid; border-color: #fff #ffffff70 #ffffff70; border-radius: 50%; animation: spin .7s linear infinite; }
.btn[aria-busy="true"] .icon { visibility: hidden; }
@keyframes spin { to { transform: rotate(360deg); } }
.room-heading { display: flex; justify-content: space-between; align-items: center; gap: 24px; margin: 32px 0 28px; }
.room-heading > div { min-width: 0; }
.room-heading h1 { font-size: clamp(28px, 3vw, 40px); margin-top: 16px; }
.room-heading > .btn { flex-shrink: 0; }
.back-link { color: var(--muted); display: inline-flex; align-items: center; gap: 6px; font-size: 13px; text-decoration: none; }
.back-link:hover { color: var(--accent); text-decoration: underline; }
.back-link .icon { width: 16px; height: 16px; }
.room-overview { display: flex; justify-content: space-between; align-items: center; gap: 24px; padding: 24px 0; margin-bottom: 24px; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.room-overview > div { display: grid; gap: 4px; min-width: 0; }
.room-overview span { font-size: 13px; }
.room-overview strong { font-size: clamp(28px, 3vw, 38px); letter-spacing: -.025em; font-variant-numeric: tabular-nums; overflow-wrap: anywhere; }
.room-overview p { color: var(--muted); font-size: 14px; line-height: 1.7; }
.room-grid { display: grid; grid-template-columns: minmax(0, 1fr) 360px; grid-template-areas: "expenses participants" "expenses settlement"; gap: 24px; align-items: start; }
.panel { padding: 24px; background: var(--surface); border-radius: var(--radius-panel); min-width: 0; }
.expenses-panel { grid-area: expenses; }
.participants-panel { grid-area: participants; }
.settlement-panel { grid-area: settlement; }
.panel-heading { display: flex; align-items: center; justify-content: space-between; gap: 12px; min-height: 40px; }
.panel-heading h2 { display: flex; align-items: center; gap: 8px; }
.panel-heading > .btn { flex-shrink: 0; }
.count { font-size: 12px; font-weight: 600; color: var(--muted); background: var(--canvas); padding: 3px 7px; border-radius: 6px; }
.panel-description { color: var(--muted); font-size: 13px; margin: 8px 0 20px; }
.data-list { list-style: none; padding: 0; margin: 0; }
.empty-state { display: grid; justify-items: center; text-align: center; padding: 36px 8px; gap: 8px; color: var(--muted); font-size: 14px; }
.empty-state .icon { width: 30px; height: 30px; margin-bottom: 6px; color: var(--control-border); }
.empty-state strong { color: var(--ink); font-weight: 600; }
.empty-state p { max-width: 28ch; font-size: 13px; }
.participant-row { padding-block: 16px; border-top: 1px solid var(--line); display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 8px; align-items: center; }
.participant-name { font-weight: 600; overflow-wrap: anywhere; }
.balance-label { font-size: 12px; color: var(--muted); margin-top: 3px; }
.balance-amount { font-size: 14px; font-weight: 600; font-variant-numeric: tabular-nums; }
.positive { color: var(--success); }
.negative { color: var(--danger); }
.row-actions { display: flex; gap: 4px; }
.icon-button { min-height: 36px; width: 36px; padding: 8px; border: 0; color: var(--muted); background: transparent; border-radius: 8px; }
.icon-button .icon { width: 17px; height: 17px; }
.icon-button:hover { color: var(--ink); background: var(--canvas); }
.icon-button.danger:hover { color: var(--danger); background: #fceef0; }
.expense-row { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 12px 16px; padding: 20px 0; border-top: 1px solid var(--line); align-items: center; }
.expense-description { font-weight: 600; overflow-wrap: anywhere; }
.expense-meta { color: var(--muted); font-size: 13px; margin-top: 4px; overflow-wrap: anywhere; }
.expense-value { display: flex; align-items: center; gap: 16px; }
.money { white-space: nowrap; font-variant-numeric: tabular-nums; font-weight: 650; }
.optimization-row { display: flex; justify-content: space-between; align-items: center; gap: 16px; margin-top: 20px; }
.optimization-row label { display: grid; gap: 4px; cursor: pointer; font-size: 14px; }
.optimization-row .form-switch { padding-left: 0; margin: 0; flex-shrink: 0; }
#algorithmToggle { margin: 0; width: 42px; height: 24px; }
.form-check-input { border-color: var(--control-border); }
.form-check-input:checked { background-color: var(--accent); border-color: var(--accent); }
.mode-label { color: var(--muted); font-size: 12px; margin: 16px 0 8px; }
.transfer-row { display: grid; grid-template-columns: minmax(0, 1fr) auto; align-items: center; gap: 12px; border-top: 1px solid var(--line); padding: 16px 0; font-size: 14px; }
.transfer-names { display: grid; gap: 3px; overflow-wrap: anywhere; }
.transfer-names span { color: var(--muted); font-size: 12px; }
.transfer-names .icon { width: 14px; height: 14px; }
.room-footnote { text-align: center; color: var(--muted); font-size: 13px; padding: 28px 0 36px; }
.room-status { display: flex; flex-direction: column; align-items: center; gap: 20px; padding: 80px 20px; text-align: center; }
.form-control, .form-select { min-height: 48px; border-color: var(--control-border); border-radius: var(--radius-control); background-color: var(--surface); padding: 11px 14px; color: var(--ink); font-size: 16px; }
.form-control::placeholder { color: var(--muted); opacity: 1; }
.app-select { margin: 0; padding: 0; border: 0; background: transparent; font-size: 16px; }
.app-select.single .ts-control, .app-select.single.input-active .ts-control {
  min-height: 48px; padding: 11px 40px 11px 14px; border: 1px solid var(--control-border);
  border-radius: var(--radius-control); background: var(--surface); color: var(--ink); box-shadow: none;
  font-family: var(--bs-body-font-family); font-size: 16px; line-height: 24px; cursor: pointer;
}
.app-select.single .ts-control::after { right: 16px; border-color: var(--muted) transparent transparent; }
.app-select.single.dropdown-active .ts-control::after { border-color: transparent transparent var(--muted); }
.app-select .ts-control > .item { min-width: 0; max-width: 100%; overflow-wrap: anywhere; }
.app-select .ts-control > input { color: var(--ink); font: inherit; cursor: pointer; }
.app-select .ts-control:focus-within { outline: 3px solid var(--focus); outline-offset: 3px; border-color: var(--focus); }
.app-select:has([aria-invalid="true"]) .ts-control { border-color: var(--danger); }
.app-select.disabled { opacity: .65; }
.app-select.disabled .ts-control { cursor: not-allowed; }
.app-select-dropdown {
  z-index: 1060; margin: 0; padding: 4px; box-sizing: border-box; border: 1px solid var(--control-border);
  border-radius: var(--radius-control); background: var(--surface); box-shadow: 0 8px 24px #202b351a;
  color: var(--ink); font-family: var(--bs-body-font-family); font-size: 16px;
}
.app-select-dropdown .ts-dropdown-content { padding: 0; overscroll-behavior: contain; }
.app-select-dropdown .option { min-height: 48px; padding: 12px 38px 12px 12px; border-radius: 6px; line-height: 24px; overflow-wrap: anywhere; position: relative; }
.app-select-dropdown .option.active { color: var(--ink); background: var(--canvas); }
.app-select-dropdown .option.selected { color: var(--accent); background: var(--accent-soft); font-weight: 600; }
.app-select-dropdown .option.selected::after { content: ""; position: absolute; right: 16px; top: 19px; width: 7px; height: 12px; border: solid currentColor; border-width: 0 2px 2px 0; transform: rotate(45deg); }
.app-select-dropdown .no-results { padding: 12px; color: var(--muted); }
.form-label { font-size: 14px; font-weight: 600; color: var(--ink); margin-bottom: 8px; }
legend.form-label { float: none; width: auto; }
.field-group { margin-bottom: 12px; }
.field-help { font-size: 12px; color: var(--muted); line-height: 1.6; margin-top: 10px; }
.field-error { color: var(--danger); font-size: 13px; min-height: 24px; padding-top: 4px; }
.field-error:empty { min-height: 12px; }
[aria-invalid="true"].form-control, [aria-invalid="true"].form-select, .selection-trigger[aria-invalid="true"] { border-color: var(--danger); }
.form-error { color: var(--danger); background: #fceef0; border-radius: 8px; padding: 12px; font-size: 14px; margin-top: 12px; overflow-wrap: anywhere; }
.form-error:empty { display: none; }
.modal-dialog { max-width: 480px; }
.modal-content { background: var(--surface); border: 0; border-radius: var(--radius-panel); box-shadow: 0 24px 80px #202b352e; }
.modal-header { border: 0; padding: 24px 24px 12px; align-items: flex-start; }
.modal-title { font-size: 22px; font-weight: 700; line-height: 1.3; padding-top: 4px; }
.modal-body { padding: 16px 24px 24px; text-align: left; }
.modal-footer { padding: 16px 24px 24px; border-top: 1px solid var(--line); gap: 8px; }
.modal-footer > * { margin: 0; }
.modal-footer .btn { min-width: 102px; }
#deleteParticipantButton { margin-right: auto; min-width: auto; }
.btn-close { flex-shrink: 0; min-width: 32px; min-height: 32px; box-sizing: border-box; margin: 0 !important; padding: 10px !important; opacity: .65; }
.btn-close:hover { opacity: 1; background-color: var(--canvas); }
.selection-trigger { width: 100%; justify-content: space-between; font-weight: 400; font-size: 14px; }
.selection-trigger[aria-expanded="true"] .icon { transform: rotate(180deg); }
.selection-summary { font-size: 13px; margin-top: 8px; color: var(--muted); }
.checkbox-list { margin-top: 10px; max-height: 200px; overflow-y: auto; border: 1px solid var(--line); border-radius: var(--radius-control); padding: 4px; }
.checkbox-option { display: flex; gap: 12px; align-items: center; min-height: 44px; padding: 10px; border-radius: 6px; font-size: 14px; overflow-wrap: anywhere; }
.checkbox-option:hover { background: var(--canvas); }
.checkbox-option:has(:checked) { background: var(--accent-soft); }
.checkbox-option input { margin: 0; width: 18px; height: 18px; flex-shrink: 0; }
.payer-note { color: var(--muted); font-size: 14px; margin-bottom: 20px; overflow-wrap: anywhere; }
.notification { position: fixed; bottom: max(24px, env(safe-area-inset-bottom)); left: 50%; transform: translateX(-50%); max-width: min(480px, calc(100% - 32px)); z-index: 1090; pointer-events: none; }
.notification:not(:empty) { color: #fff; background: var(--ink); border-radius: var(--radius-control); padding: 14px 20px; box-shadow: 0 8px 24px #202b3526; font-size: 14px; }
@media (max-width: 991px) {
  .welcome { gap: 32px; padding-top: 64px; }
  .welcome-panel { padding: 28px; }
  .room-grid { grid-template-columns: minmax(0, 1fr) 320px; gap: 16px; }
  .panel { padding: 20px; }
  .expense-row { grid-template-columns: 1fr; }
  .expense-value { justify-content: space-between; }
}
@media (max-width: 767px) {
  .page-width { width: calc(100% - 32px); }
  .site-header { height: 76px; }
  .brand { font-size: 22px; }
  .header-note { display: none; }
  .welcome { grid-template-columns: 1fr; gap: 32px; padding: 36px 0; }
  .welcome h1 { font-size: clamp(38px, 8vw, 54px); }
  .welcome-description { font-size: 16px; margin-top: 16px; max-width: 40ch; }
  .welcome-steps { margin-top: 24px; gap: 10px; }
  .welcome-panel { padding: 24px; }
  .welcome-panel h2 { font-size: 22px; }
  .welcome-panel form { margin-top: 24px; }
  .room-heading { align-items: flex-start; gap: 12px; margin-top: 24px; }
  .room-heading > .btn { font-size: 12px; padding: 8px 10px; min-height: 40px; margin-top: 34px; gap: 4px; }
  .room-heading h1 { font-size: 28px; }
  .room-overview { padding: 20px 0; }
  .room-overview p { display: none; }
  .room-grid { grid-template-columns: minmax(0, 1fr); grid-template-areas: "participants" "expenses" "settlement"; }
  .expense-row { grid-template-columns: minmax(0, 1fr) auto; }
  .expense-value { flex-direction: column; align-items: flex-end; gap: 8px; }
  .modal-dialog { margin: 12px; }
  .modal-dialog-centered { min-height: calc(100% - 24px); }
  .modal-dialog-scrollable { height: calc(100% - 24px); }
  .modal-header { padding: 20px 20px 12px; }
  .modal-body { padding: 12px 20px 20px; }
  .modal-footer { padding: 16px 20px 20px; }
  .modal-title { font-size: 20px; }
  .icon-button { width: 40px; min-height: 40px; }
}
@media (max-width: 374px) {
  .panel { padding: 16px; }
  .panel-heading h2 { font-size: 18px; }
  .panel-heading .btn { padding-inline: 9px; font-size: 12px; }
  .modal-footer .btn { min-width: 84px; padding-inline: 12px; }
  .room-heading { flex-wrap: wrap; }
  .room-heading > .btn { margin-top: 0; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; scroll-behavior: auto !important; }
}
@media (forced-colors: active) {
  * { scrollbar-color: auto; }
  .btn, .panel, .welcome-panel, .notification:not(:empty) { border: 1px solid ButtonText; }
  :focus-visible { outline-color: Highlight; }
}