:root {
    color-scheme: light;
    --page-bg: #f7f5f1;
    --surface: #ffffff;
    --text: #282722;
    --muted: #716e65;
    --line: #ddd9d0;
    --accent: #27645c;
    --shared-empty: #f3eee3;
    --shared-active: #dceee9;
    --warning: #fff1c9;
    --error: #f8d7d7;
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    min-width: 280px;
    min-height: 100vh;
    background: var(--page-bg);
    color: var(--text);
    -webkit-tap-highlight-color: transparent;
}

button {
    font: inherit;
}

button:focus-visible {
    outline: 3px solid #205f9c;
    outline-offset: 2px;
}

[hidden] {
    display: none !important;
}

.app-shell {
    width: min(100%, 760px);
    margin: 0 auto;
    padding: max(18px, env(safe-area-inset-top)) 14px max(40px, env(safe-area-inset-bottom));
}

.app-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 12px;
    margin-bottom: 20px;
}

.eyebrow {
    margin: 0 0 4px;
    color: var(--muted);
    font-size: 0.78rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

h1,
h2,
h3,
p {
    margin-top: 0;
}

h1 {
    margin-bottom: 0;
    font-size: clamp(1.45rem, 6vw, 2rem);
    line-height: 1.1;
}

.current-person {
    flex: 0 0 auto;
    text-align: right;
}

.current-person-name {
    display: block;
    padding: 7px 10px;
    border-radius: 10px;
    font-weight: 800;
}

.change-person {
    min-height: 38px;
    padding: 4px 8px;
    border: 0;
    background: transparent;
    color: var(--accent);
    font-size: 0.88rem;
    text-decoration: underline;
    text-underline-offset: 3px;
    cursor: pointer;
}

.section {
    margin-top: 26px;
}

.section-heading h2 {
    margin-bottom: 4px;
    font-size: 1.22rem;
}

.section-heading p {
    margin-bottom: 12px;
    color: var(--muted);
    font-size: 0.9rem;
    line-height: 1.4;
}

.item-list,
.summaries {
    display: grid;
    gap: 10px;
}

.item-row {
    position: relative;
    display: block;
    width: 100%;
    min-height: 72px;
    padding: 14px;
    border: 1px solid var(--line);
    border-radius: 14px;
    background: var(--surface);
    color: var(--text);
    text-align: left;
    cursor: pointer;
    box-shadow: 0 1px 2px rgb(36 32 24 / 5%);
    touch-action: manipulation;
}

.item-row:active:not(:disabled),
.summary-item.own-item:active:not(:disabled) {
    transform: scale(0.99);
}

.item-row.shared-item {
    border-color: #d9cdb7;
    background: var(--shared-empty);
}

.item-row.shared-item.has-participants {
    border-color: #9fc9bf;
    background: var(--shared-active);
}

.item-row.is-busy,
.summary-item:disabled {
    cursor: wait;
    opacity: 0.62;
}

.item-name {
    display: block;
    margin-bottom: 7px;
    font-size: 1.04rem;
    font-weight: 750;
    line-height: 1.25;
}

.item-price-line,
.summary-item-main,
.summary-heading {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: 12px;
}

.item-unit-price,
.shared-people,
.fraction-note,
.summary-empty {
    color: var(--muted);
}

.item-total,
.summary-item-price,
.summary-heading strong {
    flex: 0 0 auto;
    font-variant-numeric: tabular-nums;
    white-space: nowrap;
}

.shared-people,
.shared-share,
.participating {
    display: block;
    margin-top: 8px;
    font-size: 0.88rem;
    line-height: 1.3;
}

.shared-share {
    font-weight: 650;
}

.participating {
    color: #176154;
    font-weight: 800;
}

.empty-list,
.loading {
    padding: 22px 14px;
    border: 1px dashed var(--line);
    border-radius: 14px;
    color: var(--muted);
    text-align: center;
}

.person-summary {
    --person-color: #eee;
    overflow: hidden;
    padding: 15px;
    border: 1px solid rgb(0 0 0 / 7%);
    border-radius: 15px;
    background: var(--person-color);
}

/* This is the single stable color mapping used by selection buttons and summaries. */
.person-andrey { --person-color: #dcecf8; background-color: var(--person-color); }
.person-anton  { --person-color: #f7dfd7; background-color: var(--person-color); }
.person-sasha  { --person-color: #e4e0f6; background-color: var(--person-color); }
.person-pasha  { --person-color: #ddefd9; background-color: var(--person-color); }
.person-lekha  { --person-color: #f7ebc8; background-color: var(--person-color); }
.person-igor   { --person-color: #dcefed; background-color: var(--person-color); }

.summary-heading {
    margin-bottom: 0;
    font-size: 1.05rem;
}

.summary-heading strong {
    font-size: 1.12rem;
}

.summary-items {
    display: grid;
    gap: 7px;
    margin-top: 12px;
}

.summary-item {
    width: 100%;
    padding: 9px 10px;
    border: 0;
    border-radius: 9px;
    background: rgb(255 255 255 / 58%);
    color: var(--text);
    text-align: left;
}

.summary-item.own-item {
    min-height: 48px;
    cursor: pointer;
    touch-action: manipulation;
}

.summary-item-name {
    line-height: 1.3;
}

.fraction-note {
    display: block;
    margin-top: 4px;
    font-size: 0.78rem;
}

.summary-empty {
    margin: 9px 0 0;
    font-size: 0.88rem;
}

.message {
    position: sticky;
    z-index: 5;
    top: 8px;
    margin: 0 0 14px;
    padding: 11px 13px;
    border: 1px solid rgb(0 0 0 / 9%);
    border-radius: 11px;
    font-size: 0.9rem;
    box-shadow: 0 3px 14px rgb(0 0 0 / 10%);
}

.message-error { background: var(--error); }
.message-warning { background: var(--warning); }

.person-screen {
    position: fixed;
    z-index: 20;
    inset: 0;
    display: grid;
    place-items: center;
    overflow-y: auto;
    padding: max(20px, env(safe-area-inset-top)) 16px max(20px, env(safe-area-inset-bottom));
    background: rgb(247 245 241 / 96%);
}

.person-card {
    width: min(100%, 480px);
}

.person-card h2 {
    margin-bottom: 20px;
    font-size: clamp(2rem, 10vw, 3rem);
}

.person-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px;
}

.person-choice {
    min-height: 76px;
    padding: 14px 8px;
    border: 1px solid rgb(0 0 0 / 9%);
    border-radius: 15px;
    color: var(--text);
    font-size: 1.15rem;
    font-weight: 800;
    cursor: pointer;
    box-shadow: 0 2px 7px rgb(0 0 0 / 6%);
    touch-action: manipulation;
}

.person-choice:active {
    transform: scale(0.98);
}

@media (min-width: 620px) {
    .app-shell {
        padding-right: 24px;
        padding-left: 24px;
    }

    .summaries {
        grid-template-columns: repeat(2, minmax(0, 1fr));
        align-items: start;
    }
}

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        scroll-behavior: auto !important;
    }
}