/*
 * Цвета берутся из темы Telegram (--tg-theme-*), поэтому приложение само
 * подстраивается под светлую/тёмную тему клиента. Значения после запятой —
 * запасные для открытия в обычном браузере.
 */
:root {
    --bg: var(--tg-theme-bg-color, #ffffff);
    --text: var(--tg-theme-text-color, #000000);
    --hint: var(--tg-theme-hint-color, #8a8a8e);
    --link: var(--tg-theme-link-color, #2481cc);
    --button: var(--tg-theme-button-color, #2481cc);
    --button-text: var(--tg-theme-button-text-color, #ffffff);
    --section-bg: var(--tg-theme-section-bg-color, var(--tg-theme-secondary-bg-color, #f1f1f4));
    --separator: var(--tg-theme-section-separator-color, rgba(128, 128, 128, 0.25));
    --accent: var(--tg-theme-accent-text-color, #2481cc);
    --danger: var(--tg-theme-destructive-text-color, #e53935);
    --radius: 12px;
    --gap: 12px;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg: var(--tg-theme-bg-color, #17212b);
        --text: var(--tg-theme-text-color, #f5f5f5);
        --hint: var(--tg-theme-hint-color, #708499);
        --section-bg: var(--tg-theme-section-bg-color, var(--tg-theme-secondary-bg-color, #232e3c));
    }
}

* {
    box-sizing: border-box;
}

html, body {
    margin: 0;
    background: var(--bg);
    color: var(--text);
    font: 16px/1.4 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    -webkit-text-size-adjust: 100%;
}

.app {
    max-width: 560px;
    margin: 0 auto;
    padding: calc(16px + var(--tg-content-safe-area-inset-top, 0px)) 16px
             calc(24px + var(--tg-content-safe-area-inset-bottom, env(safe-area-inset-bottom, 0px)));
}

[hidden] {
    display: none !important;
}

h1, h2 {
    margin: 0 0 8px;
    line-height: 1.2;
}

h1 { font-size: 28px; }
h2 { font-size: 22px; }

.hint {
    color: var(--hint);
    font-size: 14px;
    margin: 0 0 16px;
}

.screen {
    display: flex;
    flex-direction: column;
    gap: 4px;
    animation: fade-in .18s ease-out;
}

@keyframes fade-in {
    from { opacity: 0; transform: translateY(4px); }
    to { opacity: 1; transform: none; }
}

/* ---------- Экран 1 ---------- */

.hero {
    text-align: center;
    padding: 12vh 8px 32px;
}

.hero__icon {
    font-size: 56px;
    margin-bottom: 12px;
}

/* ---------- Кнопки ---------- */

.btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    min-height: 48px;
    padding: 12px 16px;
    border: 0;
    border-radius: var(--radius);
    font: inherit;
    font-weight: 600;
    cursor: pointer;
    -webkit-tap-highlight-color: transparent;
    transition: opacity .15s, transform .05s;
}

.btn:active { transform: scale(.985); }
.btn:disabled, .btn.is-disabled { opacity: .45; pointer-events: none; }

.btn--primary {
    background: var(--button);
    color: var(--button-text);
    margin-top: 8px;
}

.btn--link {
    background: none;
    color: var(--link);
    font-weight: 500;
    margin-top: 16px;
}

.btn--file {
    position: relative;
    overflow: hidden;
}

.btn--file input {
    position: absolute;
    inset: 0;
    opacity: 0;
    cursor: pointer;
}

/* ---------- Поля ---------- */

.field {
    display: block;
}

.field__label {
    display: block;
    font-size: 13px;
    color: var(--hint);
    margin: 0 0 6px 4px;
    text-transform: uppercase;
    letter-spacing: .03em;
}

textarea, select, input[type="number"] {
    width: 100%;
    font: inherit;
    color: var(--text);
    background: var(--section-bg);
    border: 1px solid transparent;
    border-radius: 10px;
    padding: 10px 12px;
    outline: none;
    -webkit-appearance: none;
    appearance: none;
}

textarea {
    resize: vertical;
    min-height: 140px;
}

textarea:focus, select:focus, input[type="number"]:focus {
    border-color: var(--button);
}

select {
    padding-right: 32px;
    background-image: linear-gradient(45deg, transparent 50%, var(--hint) 50%),
                      linear-gradient(135deg, var(--hint) 50%, transparent 50%);
    background-position: calc(100% - 17px) 50%, calc(100% - 12px) 50%;
    background-size: 5px 5px;
    background-repeat: no-repeat;
}

select:disabled {
    opacity: 1;
    color: var(--text);
    background-image: none;
}

/* ---------- Экран 3 ---------- */

.processing {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 32px 0;
    text-align: center;
}

.processing p { margin: 12px 0 0; font-weight: 600; }
.processing .hint { font-weight: 400; margin-top: 4px; }

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid var(--separator);
    border-top-color: var(--button);
    border-radius: 50%;
    animation: spin .8s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* ---------- Вкладки ---------- */

.tabs {
    display: flex;
    gap: 4px;
    padding: 4px;
    background: var(--section-bg);
    border-radius: var(--radius);
    margin-bottom: 12px;
    position: sticky;
    top: 0;
    z-index: 5;
}

.tabs__tab {
    flex: 1;
    min-height: 36px;
    border: 0;
    border-radius: 9px;
    background: none;
    color: var(--hint);
    font: inherit;
    font-weight: 600;
    cursor: pointer;
}

.tabs__tab.is-active {
    background: var(--bg);
    color: var(--text);
    box-shadow: 0 1px 3px rgba(0, 0, 0, .12);
}

/* ---------- Позиции ---------- */

.items {
    display: flex;
    flex-direction: column;
    gap: var(--gap);
}

.card {
    background: var(--section-bg);
    border-radius: var(--radius);
    padding: 12px;
}

.item.is-busy {
    opacity: .6;
    pointer-events: none;
}

.item__head {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    gap: 12px;
    margin-bottom: 8px;
}

.item__name {
    font-weight: 600;
    overflow-wrap: anywhere;
}

.item__price {
    font-weight: 600;
    white-space: nowrap;
    font-variant-numeric: tabular-nums;
}

.item__status {
    font-size: 13px;
    color: var(--hint);
    margin: -4px 0 8px;
}

.item__status--todo {
    color: var(--danger);
}

.share-row {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 88px;
    gap: 8px;
    align-items: center;
    margin-top: 6px;
}

.share-row__amount {
    grid-column: 1 / -1;
    font-size: 12px;
    color: var(--hint);
    margin: -2px 0 2px 4px;
    font-variant-numeric: tabular-nums;
}

.share-row input::-webkit-outer-spin-button,
.share-row input::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

.share-row input {
    -moz-appearance: textfield;
    text-align: right;
    font-variant-numeric: tabular-nums;
    background: var(--bg);
}

.share-row select {
    background-color: var(--bg);
}

.share-row--new select,
.share-row--new input {
    border: 1px dashed var(--separator);
}

input.is-invalid {
    border-color: var(--danger) !important;
    color: var(--danger);
}

.share-row__error {
    grid-column: 1 / -1;
    color: var(--danger);
    font-size: 12px;
    margin: 0 0 0 4px;
}

/* ---------- Отчёт ---------- */

.report {
    width: 100%;
    border-collapse: collapse;
    font-variant-numeric: tabular-nums;
}

.report th, .report td {
    padding: 10px 4px;
    text-align: left;
    border-bottom: 1px solid var(--separator);
}

.report thead th {
    font-size: 13px;
    color: var(--hint);
    font-weight: 500;
}

.report tfoot th {
    border-bottom: 0;
    font-size: 17px;
}

.report .num {
    text-align: right;
    white-space: nowrap;
}

.warning {
    color: var(--danger);
    font-size: 14px;
    margin: 8px 0 0;
}

/* ---------- Toast ---------- */

.toasts {
    position: fixed;
    left: 16px;
    right: 16px;
    bottom: calc(16px + var(--tg-content-safe-area-inset-bottom, env(safe-area-inset-bottom, 0px)));
    display: flex;
    flex-direction: column;
    gap: 8px;
    align-items: center;
    pointer-events: none;
    z-index: 100;
}

.toast {
    max-width: 528px;
    width: 100%;
    padding: 12px 16px;
    border-radius: var(--radius);
    background: rgba(30, 30, 30, .94);
    color: #fff;
    font-size: 15px;
    box-shadow: 0 6px 24px rgba(0, 0, 0, .25);
    pointer-events: auto;
    animation: toast-in .2s ease-out;
}

.toast--error {
    background: #c62828;
}

.toast--hide {
    opacity: 0;
    transform: translateY(8px);
    transition: opacity .25s, transform .25s;
}

@keyframes toast-in {
    from { opacity: 0; transform: translateY(8px); }
    to { opacity: 1; transform: none; }
}