/* =============================================================================
   Day Preview Popup — hour-by-hour timeline
   ============================================================================= */

.day-preview-backdrop {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1070;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s ease;
}

.day-preview-backdrop.is-open {
    opacity: 1;
    pointer-events: auto;
}

.day-preview {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) scale(0.95);
    width: 90%;
    max-width: 400px;
    max-height: 80vh;
    display: flex;
    flex-direction: column;
    background: var(--color-card-bg, #fff);
    border-radius: var(--radius-lg, 0.75rem);
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    z-index: 1080;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s ease, transform 0.2s ease;
    overflow: hidden;
}

.day-preview.is-open {
    opacity: 1;
    pointer-events: auto;
    transform: translate(-50%, -50%) scale(1);
}

/* Header */
.day-preview__header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.875rem 1rem;
    border-bottom: 1px solid var(--color-border, #e5e7eb);
    flex-shrink: 0;
}

.day-preview__label {
    font-weight: 700;
    font-size: 0.9375rem;
    color: var(--color-text, #1f2937);
}

.day-preview__close {
    background: none;
    border: none;
    font-size: 1.35rem;
    line-height: 1;
    color: var(--color-text-light, #6b7280);
    cursor: pointer;
    padding: 0.125rem 0.25rem;
    border-radius: var(--radius-sm, 0.25rem);
}

.day-preview__close:hover {
    color: var(--color-text, #1f2937);
    background: var(--color-hover-bg, #f3f4f6);
}

/* Scrollable timeline body */
.day-preview__timeline {
    overflow-y: auto;
    padding: 0.25rem 0;
    flex: 1;
}

/* Each hour row */
.day-preview__row {
    display: flex;
    align-items: stretch;
    min-height: 2.25rem;
}

/* Hour label column */
.day-preview__hour {
    flex-shrink: 0;
    width: 3.25rem;
    padding: 0.375rem 0.5rem 0.375rem 0.75rem;
    font-size: 0.6875rem;
    font-weight: 600;
    color: var(--color-text-light, #9ca3af);
    text-align: right;
    line-height: 1;
    white-space: nowrap;
}

/* Slot column — right side with border */
.day-preview__slot {
    flex: 1;
    border-top: 1px solid var(--color-border, #e5e7eb);
    padding: 0.125rem 0.5rem 0.125rem 0.625rem;
    min-height: 2.25rem;
}

.day-preview__row:last-child .day-preview__slot {
    border-bottom: 1px solid var(--color-border, #e5e7eb);
}

/* Event block inside a slot */
.day-preview__event {
    display: flex;
    align-items: center;
    gap: 0.375rem;
    padding: 0.3rem 0.5rem;
    margin: 0.125rem 0;
    border-radius: var(--radius-md, 0.375rem);
    background: #f3f4f6;
    font-size: 0.78rem;
    line-height: 1.3;
    border-left: 3px solid #9ca3af;
}

.day-preview__event--target {
    background: color-mix(in srgb, var(--brand-primary, #6366f1) 10%, transparent);
    border-left-color: var(--brand-primary, #6366f1);
}

.day-preview__event-time {
    flex-shrink: 0;
    font-weight: 600;
    color: var(--color-text, #1f2937);
    font-size: 0.72rem;
}

.day-preview__event--target .day-preview__event-time {
    color: var(--brand-primary, #6366f1);
}

.day-preview__event-label {
    flex: 1;
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    color: var(--color-text, #374151);
    font-weight: 500;
}

.day-preview__event--target .day-preview__event-label {
    color: var(--color-text, #1f2937);
    font-weight: 600;
}

/* Loading / empty */
.day-preview__empty {
    text-align: center;
    color: var(--color-text-light, #6b7280);
    font-size: 0.8125rem;
    padding: 2rem 1rem;
}

/* Mobile full-width */
@media (max-width: 480px) {
    .day-preview {
        width: 95%;
        max-height: 85vh;
    }
}