* {
    box-sizing: border-box;
}

:root {
    color-scheme: dark;

    --page-bg: #17191f;
    --panel-bg: #24272f;
    --surface-bg: #1d2026;
    --surface-raised: #30343e;
    --surface-hover: #2d313b;
    --input-bg: #17191f;
    --border: #3b3f49;
    --input-border: #555b68;
    --text: #f4f4f5;
    --text-soft: #d8dbe2;
    --text-muted: #b8bdc8;
    --accent: #93b4ff;
    --accent-text: #101217;
    --selected-bg: #39445d;
    --success: #9ee6b3;
    --danger: #ffaaaa;
    --danger-border: #9b4f55;
    --danger-text: #ffb3b8;
    --danger-hover: #49292d;
    --focus-ring: rgba(147, 180, 255, 0.2);
    --overlay-bg: rgba(0, 0, 0, 0.55);
    --tray-bg: rgba(29, 32, 38, 0.97);
    --tray-shadow: 0 12px 40px rgba(0, 0, 0, 0.45);
    --panel-shadow: none;
    --sidebar-shadow: none;
}

:root[data-theme="light"] {
    color-scheme: light;

    --page-bg: #eef1f6;
    --panel-bg: #ffffff;
    --surface-bg: #f8f9fc;
    --surface-raised: #e5ebf5;
    --surface-hover: #e2e8f1;
    --input-bg: #f8f9fc;
    --border: #d3d9e4;
    --input-border: #b8c1d0;
    --text: #172033;
    --text-soft: #37445a;
    --text-muted: #5b6576;
    --accent: #315ca8;
    --accent-text: #ffffff;
    --selected-bg: #d9e5fb;
    --success: #24733d;
    --danger: #a22f3b;
    --danger-border: #b74b57;
    --danger-text: #8d2430;
    --danger-hover: #f8dfe2;
    --focus-ring: rgba(49, 92, 168, 0.2);
    --tray-bg: rgba(255, 255, 255, 0.97);
    --tray-shadow: 0 12px 40px rgba(34, 48, 74, 0.2);
    --panel-shadow: 0 10px 30px rgba(34, 48, 74, 0.08);
    --sidebar-shadow: 8px 0 28px rgba(34, 48, 74, 0.16);
}

body {
    margin: 0;
    min-height: 100dvh;

    font-family:
        system-ui,
        -apple-system,
        BlinkMacSystemFont,
        "Segoe UI",
        sans-serif;

    background: var(--page-bg);
    color: var(--text);
}

button,
input,
select {
    font: inherit;
}

[hidden] {
    display: none !important;
}

.menu-button {
    position: fixed;
    z-index: 20;
    top: 16px;
    left: 16px;

    width: 46px;
    height: 46px;
    margin: 0;
    padding: 0;

    font-size: 1.4rem;
}

.selection-tray {
    position: fixed;
    z-index: 25;
    right: 16px;
    bottom: 16px;
    left: 16px;

    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(180px, 240px);
    gap: 16px;
    align-items: center;

    width: min(calc(100% - 32px), 760px);
    margin: 0 auto;
    padding: 14px;

    border: 1px solid var(--input-border);
    border-radius: 14px;

    background: var(--tray-bg);
    box-shadow: var(--tray-shadow);
    backdrop-filter: blur(12px);
}

.selection-tray-details {
    display: grid;
    gap: 4px;
    min-width: 0;
}

.selection-tray-details span {
    overflow: hidden;

    color: var(--text-soft);
    text-overflow: ellipsis;
    white-space: nowrap;
}

.selection-tray-details strong {
    color: var(--success);
    font-size: 1.12rem;
}

.selection-tray button {
    margin: 0;
}

.sidebar-overlay {
    position: fixed;
    z-index: 30;
    inset: 0;

    background: var(--overlay-bg);
}

.sidebar {
    position: fixed;
    z-index: 40;
    top: 0;
    bottom: 0;
    left: 0;

    width: min(82vw, 300px);
    padding: 20px;

    display: flex;
    flex-direction: column;

    border-right: 1px solid var(--border);
    background: var(--surface-bg);
    box-shadow: var(--sidebar-shadow);

    transform: translateX(-102%);
    transition: transform 180ms ease;
}

.sidebar.open {
    transform: translateX(0);
}

.sidebar-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;

    margin-bottom: 28px;
}

.icon-button,
.nav-button,
.secondary-button,
.text-button,
.remove-tier-button {
    margin: 0;
}

.icon-button {
    width: 40px;
    padding: 7px;

    background: transparent;
    color: var(--text);
    font-size: 1.5rem;
}

.nav-button {
    margin-bottom: 8px;

    background: transparent;
    color: var(--text-soft);
    text-align: left;
}

.nav-button.active {
    background: var(--surface-raised);
    color: var(--text);
}

.sidebar-theme {
    margin-top: auto;
    padding-top: 20px;

    border-top: 1px solid var(--border);
}

.sidebar-theme > span {
    display: block;
    margin-bottom: 8px;

    color: var(--text-muted);
    font-size: 0.78rem;
    font-weight: 700;
    letter-spacing: 0.06em;
    text-transform: uppercase;
}

.theme-toggle {
    display: flex;
    align-items: center;
    gap: 10px;

    margin: 0;

    background: var(--surface-raised);
    color: var(--text);
    text-align: left;
}

#theme-icon {
    font-size: 1.2rem;
}

.page {
    min-height: 100dvh;

    display: grid;
    place-items: center;

    padding: 24px;
}

.calculator {
    width: min(100%, 520px);

    padding: 28px;

    border: 1px solid var(--border);
    border-radius: 16px;

    background: var(--panel-bg);
    box-shadow: var(--panel-shadow);
}

.calculator-workspace {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(340px, 400px);
    gap: 24px;
    align-items: start;

    width: min(100%, 1180px);
}

.calculator-workspace > .calculator {
    width: 100%;
}

.calculator-main {
    min-width: 0;
}

.active-order-panel {
    position: sticky;
    top: 24px;

    max-height: calc(100dvh - 48px);
    overflow-y: auto;
}

.eyebrow {
    margin: 0 0 4px;

    color: var(--accent);
    font-size: 0.76rem;
    font-weight: 800;
    letter-spacing: 0.09em;
    text-transform: uppercase;
}

.active-order-total {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: 16px;

    margin: 18px 0;
    padding: 14px;

    border-radius: 10px;

    background: var(--surface-raised);
}

.active-order-total span {
    color: var(--text-muted);
}

.active-order-total strong {
    font-size: 1.35rem;
}

.desktop-order-items {
    max-height: 44vh;
    overflow-y: auto;
    padding-right: 3px;
}

h1 {
    margin-top: 0;
    margin-bottom: 8px;
}

.description {
    margin-top: 0;
    margin-bottom: 24px;

    color: var(--text-muted);
    line-height: 1.5;
}

label {
    display: block;

    margin-bottom: 8px;

    font-weight: 600;
}

.money-input {
    display: flex;
    align-items: center;
    gap: 8px;

    padding: 0 14px;

    border: 1px solid var(--input-border);
    border-radius: 10px;

    background: var(--input-bg);
}

.money-input:focus-within {
    border-color: var(--accent);
    outline: 2px solid var(--focus-ring);
}

.money-input span {
    color: var(--text-muted);
    font-size: 1.2rem;
}

.money-input input {
    width: 100%;

    padding: 14px 0;

    border: 0;
    outline: 0;

    background: transparent;
    color: var(--text);

    font-size: 1.2rem;
}

button {
    width: 100%;

    margin-top: 18px;
    padding: 13px 16px;

    border: 0;
    border-radius: 10px;

    background: var(--accent);
    color: var(--accent-text);

    font-weight: 700;
    cursor: pointer;
}

button:disabled {
    opacity: 0.65;
    cursor: not-allowed;
}

:where(button, input, select, summary):focus-visible {
    outline: 3px solid var(--accent);
    outline-offset: 3px;
}

.error-message {
    min-height: 24px;

    margin-top: 12px;
    margin-bottom: 0;

    color: var(--danger);
}

.results {
    display: grid;
    gap: 12px;

    margin-top: 18px;
    padding-top: 18px;

    border-top: 1px solid var(--border);
}

.result-row {
    display: flex;
    justify-content: space-between;
    gap: 20px;
}

.result-row span {
    color: var(--text-muted);
}

.final-offer {
    margin-top: 4px;
    padding: 14px;

    border-radius: 10px;

    background: var(--surface-raised);

    font-size: 1.15rem;
}

.card-search {
    margin-bottom: 28px;
    padding-bottom: 28px;

    border-bottom: 1px solid var(--border);
}

.card-search h2 {
    margin-top: 0;
}

.card-search input {
    width: 100%;

    padding: 14px;

    border: 1px solid var(--input-border);
    border-radius: 10px;

    background: var(--input-bg);
    color: var(--text);
}

.card-search select {
    width: 100%;
    margin-bottom: 16px;
    padding: 14px;

    border: 1px solid var(--input-border);
    border-radius: 10px;

    background: var(--input-bg);
    color: var(--text);
}

.search-results {
    display: grid;
    gap: 14px;

    margin-top: 18px;
}

.card-result {
    padding: 14px;

    border: 1px solid var(--border);
    border-radius: 10px;

    background: var(--surface-bg);
}

.card-result h3 {
    margin-top: 0;
    margin-bottom: 6px;
}

.card-result p {
    margin-top: 0;
    margin-bottom: 12px;

    color: var(--text-muted);
}

.variant-list {
    display: grid;
    gap: 8px;
}

.variant-button {
    margin-top: 0;

    text-align: left;

    background: var(--surface-raised);
    color: var(--text);
}

.variant-button.selected {
    outline: 2px solid var(--accent);
    background: var(--selected-bg);
}

.variant-details {
    margin-top: 4px;
}

.variant-details summary {
    padding: 10px 12px;

    border: 1px solid var(--input-border);
    border-radius: 8px;

    background: var(--surface-bg);
    color: var(--text-soft);

    font-weight: 600;
    cursor: pointer;
}

.variant-details summary:hover {
    background: var(--surface-hover);
}

.variant-details[open] summary {
    margin-bottom: 8px;
}

.expanded-variants {
    padding-left: 8px;

    border-left: 2px solid var(--border);
}

.tier-labels,
.tier-row {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 100px 36px;
    gap: 10px;
    align-items: center;
}

.tier-labels {
    margin-bottom: 8px;

    color: var(--text-muted);
    font-size: 0.8rem;
    font-weight: 700;
    text-transform: uppercase;
}

.tier-editor {
    display: grid;
    gap: 10px;
}

.settings-section + .settings-section {
    margin-top: 28px;
    padding-top: 24px;

    border-top: 1px solid var(--border);
}

.settings-section h2 {
    margin-top: 0;
}

.settings-section select {
    width: 100%;
    padding: 13px;

    border: 1px solid var(--input-border);
    border-radius: 10px;

    background: var(--input-bg);
    color: var(--text);
}

.settings-appearance {
    margin-top: 18px;
    padding-top: 18px;
}

.settings-appearance .theme-toggle {
    width: 100%;
}

.tier-row {
    padding: 12px;

    border: 1px solid var(--border);
    border-radius: 10px;

    background: var(--surface-bg);
}

.range-editor {
    display: flex;
    align-items: center;
    gap: 8px;

    color: var(--text-muted);
}

.range-editor input,
.percentage-editor input {
    min-width: 0;
    padding: 9px;

    border: 1px solid var(--input-border);
    border-radius: 8px;

    background: var(--input-bg);
    color: var(--text);
}

.range-editor input {
    width: 100%;
}

.percentage-editor {
    display: flex;
    align-items: center;
    gap: 5px;
}

.percentage-editor input {
    width: 70px;
}

.remove-tier-button {
    width: 36px;
    padding: 7px;

    background: transparent;
    color: var(--danger);
    font-size: 1.25rem;
}

.secondary-button {
    border: 1px solid var(--input-border);

    background: transparent;
    color: var(--text-soft);
}

.text-button {
    background: transparent;
    color: var(--text-muted);
}

.success-message {
    min-height: 24px;

    color: var(--success);
}

.active-order-controls,
.ledger-section {
    margin-top: 24px;
    padding-top: 20px;

    border-top: 1px solid var(--border);
}

.active-order-controls input {
    width: 100%;
    padding: 13px;

    border: 1px solid var(--input-border);
    border-radius: 10px;

    background: var(--input-bg);
    color: var(--text);
}

.section-heading,
.completed-order summary {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
}

.count-badge {
    float: right;

    min-width: 24px;
    padding: 2px 7px;

    border-radius: 999px;

    background: var(--accent);
    color: var(--accent-text);
    text-align: center;
    font-size: 0.8rem;
}

.section-heading h2 {
    margin: 0;
}

.section-heading {
    margin-bottom: 12px;
}

.order-items,
.completed-orders,
.completed-order-items {
    display: grid;
    gap: 10px;
}

.purchase-item {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto auto;
    gap: 10px;
    align-items: center;

    padding: 12px;

    border: 1px solid var(--border);
    border-radius: 10px;

    background: var(--surface-bg);
}

.purchase-item p {
    margin: 4px 0 0;

    color: var(--text-muted);
    font-size: 0.86rem;
}

.remove-purchase-button {
    width: 34px;
    margin: 0;
    padding: 6px;

    background: transparent;
    color: var(--danger);
    font-size: 1.2rem;
}

.completed-order {
    border: 1px solid var(--border);
    border-radius: 10px;

    background: var(--surface-bg);
}

.completed-order summary {
    padding: 14px;

    cursor: pointer;
}

.completed-order-items {
    padding: 0 10px 10px;
}

.empty-state,
.storage-note {
    color: var(--text-muted);
}

#export-csv-button:disabled {
    cursor: not-allowed;
}

.ledger-actions {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
}

.ledger-actions button {
    margin-top: 18px;
}

.danger-button {
    border: 1px solid var(--danger-border);

    background: transparent;
    color: var(--danger-text);
}

.danger-button:hover:not(:disabled) {
    background: var(--danger-hover);
}

.danger-button:disabled {
    opacity: 0.45;
    cursor: not-allowed;
}

@media (max-width: 900px) {
    .calculator-workspace {
        grid-template-columns: 1fr;

        width: min(100%, 520px);
    }

    .active-order-panel {
        position: static;

        max-height: none;
        overflow: visible;
    }

    .desktop-order-items {
        max-height: none;
        overflow: visible;
    }
}

@media (max-width: 520px) {
    .page {
        align-items: start;
        padding: 74px 12px 24px;
    }

    .calculator {
        padding: 20px 16px;
    }

    .tier-labels {
        display: none;
    }

    .tier-row {
        grid-template-columns: minmax(0, 1fr) 86px 32px;
        gap: 6px;
        padding: 10px 8px;
    }

    .range-editor {
        gap: 5px;
        font-size: 0.83rem;
    }

    .percentage-editor input {
        width: 58px;
    }

    .selection-tray {
        right: 8px;
        bottom: 8px;
        left: 8px;

        grid-template-columns: 1fr;
        gap: 10px;

        width: calc(100% - 16px);
        padding: 12px;
    }

    .selection-tray-details {
        grid-template-columns: minmax(0, 1fr) auto;
        align-items: center;
        gap: 10px;
    }

    .selection-tray-details strong {
        font-size: 1rem;
    }

    .ledger-actions {
        grid-template-columns: 1fr;
    }

    .ledger-actions .danger-button {
        margin-top: 0;
    }
}

.sidebar-footer {
    margin-top: auto;
    padding-top: 8px;

    font-size: 0.8rem;
    opacity: 0.7;
}

.sidebar-footer p {
    margin: 4px 0 0;
}