:root {
    --verde-laboral: #7bbe31;
    --magenta-laboral: #c10072;
    --gris-neutro: #526780;
    --texto: #edf2fa;
    --blanco: #fff;
    --tinta-suave: #c0ccdc;
    --superficie: #293c54;
    --panel: linear-gradient(145deg, #3b506c, #30445e);
    --borde: rgba(190, 209, 240, .28);
    --acento: #ffb0df;
    --campo: #21344c;
    --campo-borde: #4b5c77;
    --nav-fondo: rgba(38, 56, 79, .97);
    --nav-activo-fondo: linear-gradient(145deg, #44213f, #261d34);
    --nav-activo: #ff9bd7;
    --saldo-negativo: #ffb0df;
    --saldo-positivo: #b4eb79;
    --saldo-equilibrado: #c4d1e5;
    color-scheme: dark;
    --sombra: 0 12px 28px rgba(0, 0, 0, .16), inset 0 1px 0 rgba(255, 255, 255, .07);
}

:root[data-theme="light"] {
    --texto: #263449;
    --tinta-suave: #65748a;
    --superficie: #fff;
    --panel: linear-gradient(145deg, #fff, #f5f7fb);
    --borde: rgba(74, 94, 120, .2);
    --acento: #9b2868;
    --gris-neutro: #d9e0e9;
    --campo: #fff;
    --campo-borde: #cbd5e1;
    --nav-fondo: rgba(255, 255, 255, .96);
    --nav-activo-fondo: linear-gradient(145deg, #fff0f8, #f7e8f1);
    --nav-activo: #a11365;
    --saldo-negativo: #a11365;
    --saldo-positivo: #477d1d;
    --saldo-equilibrado: #65748a;
    color-scheme: light;
    --sombra: 0 10px 25px rgba(32, 48, 73, .07), inset 0 1px 0 rgba(255, 255, 255, .9);
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; border: 0; }
body { min-height: 100vh; margin: 0; color: var(--texto); background: radial-gradient(ellipse at 10% 0, rgba(193, 0, 114, .22), transparent 45%), radial-gradient(ellipse at 95% 80%, rgba(123, 190, 49, .12), transparent 40%), radial-gradient(circle, #7f91aa 1px, transparent 1px) 0 0 / 48px 48px, #25354b; font-family: "Segoe UI", Arial, sans-serif; line-height: 1.5; transition: background-color .2s ease, color .2s ease; }
:root[data-theme="light"] body { background: radial-gradient(ellipse at 10% 0, rgba(193, 0, 114, .09), transparent 45%), radial-gradient(ellipse at 95% 80%, rgba(123, 190, 49, .1), transparent 40%), #f3f5f8; }
.app-shell { width: min(100%, 960px); min-height: 100vh; margin: auto; background: radial-gradient(ellipse at 100% 0, rgba(193, 0, 114, .1), transparent 45%), var(--superficie); border: 1px solid var(--borde); box-shadow: 0 32px 80px rgba(0, 0, 0, .24); }
:root[data-theme="light"] .app-shell { box-shadow: 0 24px 70px rgba(32, 48, 73, .1); }
.app-header { display: flex; align-items: center; gap: 12px; min-height: 96px; padding: 20px; color: var(--blanco); background: radial-gradient(ellipse at 85% 0, #e12a98, transparent 65%), linear-gradient(135deg, #c10072, #70094d); border-bottom: 1px solid #ed63b4; border-radius: 0 0 24px 24px; box-shadow: 0 8px 32px rgba(193, 0, 114, .18), inset 0 1px 0 rgba(255, 255, 255, .25); }
.brand-mark { display: grid; flex-shrink: 0; width: 44px; height: 44px; place-items: center; border-radius: 14px; background: linear-gradient(145deg, #b7ef73, var(--verde-laboral)); box-shadow: 0 5px 0 #3f6917, 0 10px 24px rgba(123, 190, 49, .28), inset 0 1px 0 #dcffb9; transform: rotate(-6deg); color: #21320c; font-size: 1.45rem; font-weight: 800; }
.app-header h1, .screen-heading h2 { margin: 0; letter-spacing: -.03em; }
.app-header h1 { font-size: 1.6rem; }
.eyebrow { margin: 0 0 4px; font-size: .65rem; font-weight: 700; letter-spacing: .16em; }
.storage-note { max-width: 110px; margin-left: auto; padding: 6px 9px; border: 1px solid rgba(255, 255, 255, .45); border-radius: 10px; font-size: .72rem; text-align: center; }
.theme-toggle { display: grid; flex: 0 0 42px; width: 42px; min-height: 42px; place-items: center; padding: 0; border: 1px solid rgba(255, 255, 255, .45); border-radius: 13px; color: #fff; background: rgba(255, 255, 255, .13); box-shadow: inset 0 1px 0 rgba(255, 255, 255, .2); font-size: 1.2rem; }
.theme-toggle:hover { background: rgba(255, 255, 255, .24); }
main { padding: 24px 16px; }
.app-screen { animation: screen-in .2s ease-out; }
@keyframes screen-in { from { opacity: .2; transform: translateY(5px); } to { opacity: 1; transform: translateY(0); } }
.screen-heading { margin: 0 0 12px; }
.screen-heading .eyebrow { color: var(--acento); }
.screen-heading h2 { font-size: 1.4rem; }
.screen-intro { margin: 0 0 20px; color: var(--tinta-suave); font-size: .9rem; }
#appStatus:empty { display: none; }
#appStatus:not(:empty), #startupWarning { margin: 0 0 20px; border: 1px solid var(--borde); border-left: 3px solid var(--verde-laboral); border-radius: 10px; background: var(--panel); padding: 12px; font-size: .88rem; box-shadow: var(--sombra); overflow-wrap: anywhere; }

.balance-list, .group-list { display: grid; gap: 12px; margin: 0; padding: 0; list-style: none; }
.balance-card { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.2fr); align-items: center; gap: 12px; min-width: 0; padding: 16px; border: 1px solid var(--borde); border-radius: 16px; background: var(--panel); box-shadow: var(--sombra); }
.balance-card h3 { margin: 0; font-size: 1.05rem; overflow-wrap: anywhere; }
.person-heading { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; }
.archived-label { padding: 2px 7px; border-radius: 6px; background: #28354a; color: var(--tinta-suave); font-size: .72rem; }
:root[data-theme="light"] .archived-label { background: #edf1f6; }
.balance-result { min-width: 0; text-align: right; }
.balance-value { display: block; font-size: 2rem; font-family: Consolas, "Courier New", monospace; font-variant-numeric: tabular-nums; line-height: 1.2; letter-spacing: -.04em; overflow-wrap: anywhere; }
.balance-label { display: block; margin-top: 3px; font-size: .8rem; }
.balance-card[data-balance="negative"] .balance-result { color: var(--saldo-negativo); }
.balance-card[data-balance="positive"] .balance-result { color: var(--saldo-positivo); }
.balance-card[data-balance="balanced"] .balance-result { color: var(--saldo-equilibrado); }
.balance-card details { grid-column: 1 / -1; padding-top: 10px; border-top: 1px solid var(--borde); font-size: .82rem; }
.balance-card summary { color: var(--tinta-suave); }
.trip-stats { display: grid; gap: 8px; margin: 14px 0 0; }
.trip-stats div { display: flex; justify-content: space-between; gap: 12px; }
.trip-stats dt { color: var(--tinta-suave); }
.trip-stats dd { margin: 0; font-weight: bold; font-variant-numeric: tabular-nums; }
.help { margin: 12px 0; color: var(--tinta-suave); font-size: .82rem; }
.balance-help { margin: 20px 0 0; color: var(--tinta-suave); font-size: .85rem; }
summary { color: var(--acento); cursor: pointer; font-weight: bold; }
summary::marker { font-size: .8em; }

form, .settings-panel { padding: 20px; border: 1px solid var(--borde); border-radius: 16px; background: var(--panel); box-shadow: var(--sombra); }
form label, .participants legend { font-weight: bold; }
#formControls, .participants { min-width: 0; margin: 0; padding: 0; border: 0; }
.field { margin-bottom: 20px; }
.field label { display: block; margin-bottom: 6px; font-size: .9rem; }
.participants { margin-bottom: 20px; }
.participants legend { padding: 0; margin-bottom: 8px; font-size: .9rem; }
#bidaiariakZerrenda { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 8px; }
#bidaiariakZerrenda label { display: flex; align-items: center; gap: 8px; min-height: 48px; padding: 10px; border: 1px solid var(--gris-neutro); border-radius: 10px; font-size: .9rem; overflow-wrap: anywhere; }
#bidaiariakZerrenda label:has(input:checked) { border-color: #e365ad; background: rgba(193, 0, 114, .17); box-shadow: inset 0 0 16px rgba(193, 0, 114, .08); }
input:not([type="checkbox"]), select { width: 100%; min-width: 0; min-height: 46px; padding: 10px; border: 1px solid var(--campo-borde); border-radius: 10px; background: var(--campo); color: var(--texto); box-shadow: inset 0 2px 6px rgba(0, 0, 0, .08); font: inherit; }
:root:not([data-theme="light"]) input:not([type="checkbox"]), :root:not([data-theme="light"]) select { box-shadow: inset 0 2px 6px rgba(0, 0, 0, .2); }
input[type="checkbox"] { flex-shrink: 0; width: 18px; height: 18px; margin: 0; accent-color: var(--acento); }
button { min-height: 44px; padding: 10px 14px; border: 1px solid transparent; border-radius: 10px; color: #20320c; background: linear-gradient(180deg, #a0dc59, var(--verde-laboral)); box-shadow: 0 3px 0 #436c1e, inset 0 1px 0 rgba(255, 255, 255, .35); cursor: pointer; font: 700 .88rem Arial, sans-serif; line-height: 1.4; transition: transform .15s ease, box-shadow .15s ease; }
button:hover { background: #a5df65; }
button:active { transform: translateY(2px); box-shadow: none; }
button:disabled { opacity: .6; cursor: not-allowed; }
#saveTripBtn { width: 100%; }
.secondary-button, #cancelEditBtn, #historialaTaula button { border-color: rgba(255, 139, 208, .3); color: var(--acento); background: linear-gradient(145deg, #38213e, #281d33); box-shadow: inset 0 1px 0 rgba(255, 255, 255, .06); }
.secondary-button:hover, #cancelEditBtn:hover, #historialaTaula button:hover { background: #472443; }
:root[data-theme="light"] .secondary-button, :root[data-theme="light"] #cancelEditBtn, :root[data-theme="light"] #historialaTaula button { border-color: rgba(161, 19, 101, .2); color: #8e145a; background: linear-gradient(145deg, #fff, #f8eff5); }
:root[data-theme="light"] .secondary-button:hover, :root[data-theme="light"] #cancelEditBtn:hover, :root[data-theme="light"] #historialaTaula button:hover { background: #f7e6f0; }
#cancelEditBtn { width: 100%; margin-top: 8px; }
:focus-visible { outline: 3px solid var(--acento); outline-offset: 3px; }
.app-header :focus-visible { outline-color: white; }

.group-list li { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 12px 16px; border: 1px solid var(--borde); border-radius: 12px; background: var(--panel); }
.group-list .person-heading { min-width: 0; overflow-wrap: anywhere; font-weight: bold; }
.group-list button { flex-shrink: 0; }
.person-tools { display: grid; gap: 10px; margin-top: 20px; }
.person-tools label { font-size: .9rem; }
.settings-panel { margin-top: 16px; color: var(--tinta-suave); font-size: .85rem; }
.settings-panel summary { min-height: 24px; }
.backup-tools label { display: block; margin: 16px 0 8px; }
.backup-tools input[type="file"] { max-width: 100%; font-size: .8rem; }
.reset-tools { background: transparent; box-shadow: none; }
:root[data-theme="light"] .reset-tools { background: rgba(255, 255, 255, .45); }
.reset-tools summary { color: #ffabab; }
:root[data-theme="light"] .reset-tools summary { color: #a12d3d; }
.danger-button { border-color: #a8646c; color: #ffb3b3; background: transparent; box-shadow: none; }
.danger-button:hover { background: #3b202c; }
:root[data-theme="light"] .danger-button { border-color: #b34a58; color: #a12d3d; }
:root[data-theme="light"] .danger-button:hover { background: #fff0f0; }

.table-scroll { overflow-x: auto; border: 1px solid var(--borde); border-radius: 16px; background: var(--panel); box-shadow: var(--sombra); }
#historialaTaula { width: 100%; border-collapse: collapse; }
#historialaTaula th, #historialaTaula td { padding: 14px 12px; border-bottom: 1px solid var(--gris-neutro); text-align: left; font-size: .85rem; overflow-wrap: anywhere; }
#historialaTaula th { color: var(--texto); background: #3c526f; }
:root[data-theme="light"] #historialaTaula th { background: #edf1f6; }
#historialaTaula tr:last-child td { border-bottom: 0; }
#historialaTaula td:last-child { min-width: 180px; }
#historialaTaula button { margin: 2px; padding: 8px 10px; font-size: .8rem; }
footer { padding: 8px 20px calc(104px + env(safe-area-inset-bottom)); color: var(--tinta-suave); text-align: center; font-size: .72rem; }
footer p { margin: 4px 0; }
footer a { color: var(--acento); font-weight: bold; text-underline-offset: 3px; }
.bottom-nav { position: fixed; z-index: 5; bottom: 0; left: 50%; display: flex; width: min(100%, 960px); padding: 8px 12px max(8px, env(safe-area-inset-bottom)); transform: translateX(-50%); border-top: 1px solid var(--borde); background: var(--nav-fondo); box-shadow: 0 -10px 32px rgba(0, 0, 0, .12); backdrop-filter: blur(12px); }
.nav-item { flex: 1; display: grid; min-width: 0; min-height: 54px; place-items: center; gap: 2px; padding: 4px; border-radius: 12px; color: var(--tinta-suave); background: transparent; box-shadow: none; font-size: .7rem; }
.nav-item span { font-size: 1.35rem; line-height: 1; }
.nav-item:hover, .nav-item.is-active { border-color: rgba(255, 139, 208, .3); color: var(--nav-activo); background: var(--nav-activo-fondo); box-shadow: inset 0 1px 0 rgba(255, 139, 208, .1); }
:root[data-theme="light"] .nav-item:hover, :root[data-theme="light"] .nav-item.is-active { border-color: rgba(161, 19, 101, .16); box-shadow: inset 0 1px 0 rgba(255, 255, 255, .8); }

@media (hover: hover) {
    .balance-card { transition: transform .18s ease, box-shadow .18s ease; }
    .balance-card:hover { transform: translateY(-2px); box-shadow: 0 16px 32px rgba(0, 0, 0, .16); }
}

@media (min-width: 640px) {
    body { padding: 24px; }
    .app-shell { min-height: calc(100vh - 48px); border-radius: 24px; overflow: hidden; }
    .app-header { padding: 24px 32px; }
    main { padding: 32px; }
    .balance-list { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; }
    .storage-note { max-width: none; }
    .bottom-nav { bottom: 24px; width: min(calc(100% - 48px), 960px); border-radius: 0 0 24px 24px; }
    #bidaiForm { max-width: 560px; }
    #historialEpea { max-width: 260px; }
    .person-tools { grid-template-columns: 1fr auto; }
    .person-tools label, #restoreDefaultsBtn { grid-column: 1 / -1; }
}

@media (max-width: 639px) {
    .app-header { gap: 8px; padding: 16px 12px; }
    .storage-note { max-width: 78px; padding: 5px 6px; font-size: .65rem; }
    .theme-toggle { flex-basis: 38px; width: 38px; min-height: 38px; }
    /* Keep table semantics while stacking labelled cells for narrow screens. */
    #historialaTaula, #historialaTaula tbody { display: block; }
    #historialaTaula thead { position: absolute; width: 1px; height: 1px; overflow: hidden; clip-path: inset(50%); }
    #historialaTaula tr { display: block; padding: 12px 16px; border-bottom: 1px solid var(--gris-neutro); }
    #historialaTaula tr:last-child { border-bottom: 0; }
    #historialaTaula td { display: grid; grid-template-columns: 82px minmax(0, 1fr); gap: 12px; padding: 6px 0; border: 0; }
    #historialaTaula td::before { content: attr(data-label); color: var(--tinta-suave); font-size: .78rem; }
    #historialaTaula td:last-child { display: flex; flex-wrap: wrap; justify-content: flex-end; min-width: 0; gap: 6px; }
    #historialaTaula td:last-child::before { content: none; }
    #historialaTaula button { margin: 0; }
}

@media (prefers-reduced-motion: reduce) {
    .app-screen { animation: none; }
    button, body, .balance-card { transition: none; }
}

.save-dialog { width: min(340px, calc(100% - 40px)); padding: 28px; border: 1px solid var(--borde); border-radius: 22px; color: var(--texto); background: var(--panel); box-shadow: 0 24px 64px rgba(0, 0, 0, .3); text-align: center; }
.save-dialog::backdrop { background: rgba(24, 37, 56, .35); backdrop-filter: blur(4px); }
.saved-check { display: grid; width: 60px; height: 60px; margin: 0 auto 16px; place-items: center; border: 1px solid #b4eb79; border-radius: 50%; color: #c7f99a; background: rgba(123, 190, 49, .16); font-size: 2rem; }
.save-dialog h2 { margin: 0; font-size: 1.35rem; }
.save-dialog p { margin: 8px 0 0; color: var(--tinta-suave); font-size: .9rem; }
.save-dialog form { margin: 20px 0 0; padding: 0; border: 0; background: none; box-shadow: none; }
.save-dialog button { min-width: 100px; }

.driver-suggestion { padding: 12px; border-left: 3px solid var(--verde-laboral); border-radius: 8px; background: rgba(123, 190, 49, .08); overflow-wrap: anywhere; }

.history-filters { display: grid; gap: 12px; margin-bottom: 16px; }
.history-filters .field { min-width: 0; margin: 0; }
.history-filters button { justify-self: start; }
.date-range { display: grid; gap: 12px; }
.empty-state { padding: 20px; border: 1px solid var(--borde); border-radius: 16px; background: var(--panel); }
@media (min-width: 640px) {
    .history-filters, .date-range { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .date-range, .history-filters button { grid-column: 1 / -1; }
    .history-filters #historialEpea { max-width: none; }
}