:root {
    --pico-font-size: 87.5%;
    --wht-cell-size: 2.75rem;
    --wht-selected: #2ecc71;
    --wht-selected-dark: #27ae60;
}

[data-theme="dark"] {
    --pico-mark-background-color: #3d2e00;
    --pico-mark-color: #ffd666;
    --wht-selected: #3ddc84;
}

[data-theme="dark"] mark {
    background-color: var(--pico-mark-background-color);
    color: var(--pico-mark-color);
    padding: 0.15em 0.4em;
    border-radius: 3px;
}

[data-theme="dark"] input[readonly] {
    background-color: #1a1f2e;
    color: #c2c9d6;
    border-color: #3a4050;
}

footer {
    margin-top: 3rem;
    padding-top: 1rem;
    border-top: 1px solid var(--pico-muted-border-color);
    text-align: center;
}

footer .footer-source {
    display: block;
    margin-top: 0.35rem;
}

.form-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

@media (max-width: 576px) {
    .form-grid {
        grid-template-columns: 1fr;
    }
}

.error-box {
    background: rgba(220, 53, 69, 0.1);
    border: 1px solid rgba(220, 53, 69, 0.35);
    border-radius: var(--pico-border-radius);
    padding: 0.75rem 1rem;
    margin-bottom: 1rem;
}

.error-box ul {
    margin: 0;
    padding-left: 1.25rem;
}

.copy-row {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 0.75rem;
}

.copy-input {
    flex: 1;
    min-width: 0;
    font-size: 0.85rem;
}

.copy-btn.copied {
    border-color: var(--wht-selected);
}

.action-row {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    align-items: center;
}

.action-row form {
    display: contents;
}

.action-row button,
.action-row a[role="button"] {
    width: auto;
    margin: 0;
}

.share-section {
    margin: 1.5rem 0;
}

.poll-meta-line {
    color: var(--pico-muted-color);
}

.response-list {
    list-style: none;
    padding: 0;
}

.response-list li {
    padding: 0.35rem 0;
    border-bottom: 1px solid var(--pico-muted-border-color);
}

.empty-state {
    text-align: center;
    color: var(--pico-muted-color);
    padding: 1rem 0;
}

.theme-toggle-btn {
    padding: 0.25rem 0.5rem;
    min-width: auto;
}

.lang-dropdown {
    margin: 0;
    padding: 0;
}

.lang-dropdown summary {
    padding: 0.3rem 0.6rem;
    font-size: 0.8rem;
    cursor: pointer;
}

.mode-fieldset {
    border: 1px solid var(--pico-muted-border-color);
    border-radius: var(--pico-border-radius);
    padding: 0.75rem 1rem;
    margin: 1rem 0;
}

.mode-group {
    margin: 1.25rem 0;
}

.mode-group-label {
    font-weight: 600;
    margin: 0 0 0.5rem;
    font-size: 0.95rem;
}

.mode-cards {
    display: grid;
    grid-template-columns: 1fr;
    gap: 0.5rem;
}

@media (min-width: 480px) {
    .mode-cards {
        grid-template-columns: 1fr 1fr;
    }
}

.mode-card {
    display: block;
    margin: 0;
    cursor: pointer;
}

.mode-card input[type="radio"] {
    position: absolute;
    opacity: 0;
    width: 0;
    height: 0;
    pointer-events: none;
}

.mode-card-body {
    display: flex;
    flex-direction: column;
    gap: 0.2rem;
    padding: 0.75rem 0.85rem;
    border: 2px solid var(--pico-muted-border-color);
    border-radius: var(--pico-border-radius);
    background: var(--pico-card-background-color);
    min-height: 100%;
    transition: border-color 0.15s, background-color 0.15s;
}

.mode-card-title {
    font-weight: 600;
    font-size: 0.95rem;
    line-height: 1.3;
}

.mode-card-hint {
    font-size: 0.8rem;
    color: var(--pico-muted-color);
    line-height: 1.35;
}

.mode-card:has(input:checked) .mode-card-body,
.mode-card input:checked + .mode-card-body {
    border-color: var(--pico-primary);
    background: color-mix(in srgb, var(--pico-primary) 12%, var(--pico-card-background-color));
}

.mode-card:has(input:focus-visible) .mode-card-body,
.mode-card input:focus-visible + .mode-card-body {
    outline: 2px solid var(--pico-primary);
    outline-offset: 2px;
}

.mode-card:has(input:disabled) {
    cursor: default;
    opacity: 0.65;
}

#timezone-fields[hidden],
#time-fields[hidden],
#pick-date-fields[hidden],
#range-date-fields[hidden] {
    display: none;
}

.mode-fieldset legend {
    padding: 0 0.35rem;
    font-weight: 600;
}

#time-fields[hidden] {
    display: none;
}

.date-picker-wrapper {
    margin: 0.75rem 0;
    border: 1px solid var(--pico-muted-border-color);
    border-radius: var(--pico-border-radius);
    overflow: auto;
}

.date-picker-grid {
    min-width: 100%;
}

.date-picker-cell.selected {
    background: var(--wht-selected) !important;
    border-color: var(--wht-selected-dark);
}

.pick-count {
    font-size: 0.9rem;
    color: var(--pico-muted-color);
    margin: 0.25rem 0 0.75rem;
}

.field-hint {
    display: block;
    margin: -0.5rem 0 1rem;
    color: var(--pico-muted-color);
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-top: 0.5rem;
    cursor: pointer;
}

.checkbox-label input[type="checkbox"] {
    width: auto;
    margin: 0;
}

#time-fields[hidden] {
    display: none;
}

/* --- How it works dialog --- */

#how-it-works-dialog {
    max-width: 32rem;
    border: none;
    border-radius: var(--pico-border-radius);
    padding: 0;
}

#how-it-works-dialog::backdrop {
    background: rgba(0, 0, 0, 0.5);
}

#how-it-works-dialog article {
    margin: 0;
}

#how-it-works-dialog ol {
    margin-bottom: 0;
}

/* --- Availability grid --- */

.grid-section {
    margin-top: 1.5rem;
}

.grid-tabs {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.grid-tab {
    flex: 1;
    margin: 0;
}

.grid-tab.active {
    background: var(--pico-primary-background);
    color: var(--pico-primary-inverse);
    border-color: var(--pico-primary-background);
}

.participant-form {
    margin-bottom: 1rem;
}

.grid-actions {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-top: 0.75rem;
}

.save-status {
    font-size: 0.9rem;
    color: var(--pico-muted-color);
}

.save-status.success {
    color: var(--wht-selected-dark);
}

.save-status.error {
    color: #dc3545;
}

.edit-link-section {
    margin-top: 1.25rem;
    padding-top: 1rem;
    border-top: 1px solid var(--pico-muted-border-color);
}

.edit-link-hint {
    font-size: 0.9rem;
    color: var(--pico-muted-color);
    margin-bottom: 0.75rem;
}

.send-link-row {
    margin-bottom: 0.25rem;
}

.send-link-status {
    display: block;
    font-size: 0.9rem;
    color: var(--pico-muted-color);
    min-height: 1.25rem;
}

.send-link-status.success {
    color: var(--wht-selected-dark);
}

.send-link-status.error {
    color: #dc3545;
}

.grid-wrapper {
    overflow: auto;
    max-height: 70vh;
    border: 1px solid var(--pico-muted-border-color);
    border-radius: var(--pico-border-radius);
    -webkit-overflow-scrolling: touch;
}

.availability-grid {
    display: grid;
    grid-template-columns: auto repeat(var(--day-count, 7), minmax(var(--wht-cell-size), 1fr));
    width: max-content;
    min-width: 100%;
}

.grid-corner {
    position: sticky;
    top: 0;
    left: 0;
    z-index: 3;
    background: var(--pico-background-color);
    border-bottom: 1px solid var(--pico-muted-border-color);
    border-right: 1px solid var(--pico-muted-border-color);
    min-width: 3.5rem;
    min-height: 2.5rem;
}

.grid-day-header {
    position: sticky;
    top: 0;
    z-index: 2;
    background: var(--pico-background-color);
    border-bottom: 1px solid var(--pico-muted-border-color);
    padding: 0.5rem 0.25rem;
    text-align: center;
    font-size: 0.8rem;
    font-weight: 600;
    min-width: var(--wht-cell-size);
}

.grid-time-label {
    position: sticky;
    left: 0;
    z-index: 2;
    background: var(--pico-background-color);
    border-right: 1px solid var(--pico-muted-border-color);
    padding: 0 0.5rem;
    display: flex;
    align-items: center;
    justify-content: flex-end;
    font-size: 0.75rem;
    color: var(--pico-muted-color);
    min-width: 3.5rem;
    min-height: var(--wht-cell-size);
}

.grid-cell {
    width: 100%;
    min-width: var(--wht-cell-size);
    min-height: var(--wht-cell-size);
    margin: 0;
    padding: 0;
    border: 1px solid var(--pico-muted-border-color);
    border-radius: 0;
    background: var(--pico-card-background-color);
    cursor: pointer;
    touch-action: none;
    position: relative;
}

.grid-cell-empty {
    background: var(--pico-muted-border-color);
    opacity: 0.3;
    cursor: default;
}

.grid-day-header.weekend {
    background: var(--wht-weekend-bg, rgba(100, 130, 200, 0.12));
}

.grid-cell.weekend {
    background: var(--wht-weekend-bg, rgba(100, 130, 200, 0.12));
}

.grid-cell.weekend.grid-cell-empty {
    background: var(--wht-weekend-bg, rgba(100, 130, 200, 0.12));
    opacity: 0.5;
}

.availability-grid.dates-only .grid-cell {
    min-height: 3rem;
}

.availability-grid.dates-only .grid-time-label {
    font-size: 0.7rem;
}

/* --- Dates-only calendar grid --- */

.availability-grid.calendar-grid {
    display: grid;
    grid-template-columns: repeat(7, minmax(0, 1fr));
    width: 100%;
    min-width: 0;
}

.calendar-weekday-header {
    padding: 0.5rem 0.25rem;
    text-align: center;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--pico-muted-color);
    border-bottom: 1px solid var(--pico-muted-border-color);
}

.calendar-weekday-header.weekend {
    background: var(--wht-weekend-bg, rgba(100, 130, 200, 0.12));
}

.calendar-cell {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 4rem;
    padding: 0.35rem 0.25rem;
    font-size: 0.8rem;
    line-height: 1.2;
}

.calendar-day-label {
    font-weight: 600;
}

.calendar-cell-outside {
    background: var(--pico-muted-border-color);
    opacity: 0.2;
    cursor: default;
    pointer-events: none;
}

.calendar-cell .cell-count {
    margin-top: 0.15rem;
}

.availability-grid[data-mode="select"] .grid-cell.selected {
    background: var(--wht-selected) !important;
    border-color: var(--wht-selected-dark);
}

.grid-cell .cell-count {
    font-size: 0.7rem;
    font-weight: 600;
    color: rgba(0, 0, 0, 0.7);
}

[data-theme="dark"] .grid-cell .cell-count {
    color: rgba(255, 255, 255, 0.85);
}

.availability-grid[data-mode="heatmap"] .grid-cell {
    cursor: default;
}

.availability-grid[data-mode="heatmap"] .grid-cell.selected {
    outline: 2px solid var(--pico-primary);
    outline-offset: -2px;
}

.heatmap-legend {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-top: 0.75rem;
    font-size: 0.85rem;
    color: var(--pico-muted-color);
}

.grid-slot-tooltip {
    position: fixed;
    z-index: 1000;
    max-width: min(16rem, calc(100vw - 1rem));
    padding: 0.45rem 0.65rem;
    border-radius: var(--pico-border-radius);
    background: var(--pico-background-color);
    border: 1px solid var(--pico-muted-border-color);
    box-shadow: var(--pico-box-shadow);
    font-size: 0.85rem;
    line-height: 1.35;
    pointer-events: none;
}

.grid-slot-tooltip ul {
    margin: 0;
    padding: 0;
    list-style: none;
}

.grid-slot-tooltip li + li {
    margin-top: 0.15rem;
}

.availability-grid[data-mode="heatmap"] .grid-cell[data-attendees] {
    cursor: pointer;
}

.legend-bar {
    flex: 1;
    max-width: 12rem;
    height: 0.75rem;
    border-radius: 4px;
    background: linear-gradient(to right, hsl(0, 70%, 92%), hsl(120, 65%, 55%));
}

@media (max-width: 576px) {
    :root {
        --wht-cell-size: 2.25rem;
    }

    .grid-wrapper {
        max-height: 60vh;
    }

    .copy-row {
        flex-direction: column;
    }

    .grid-tab {
        font-size: 0.85rem;
        padding: 0.5rem;
    }
}

@media (min-width: 992px) {
    :root {
        --wht-cell-size: 3rem;
    }

    .container {
        max-width: 960px;
    }
}

@media (min-width: 1200px) {
    .container {
        max-width: 1140px;
    }
}