/* Explain: Styles for the availability calendar overlay and calendar grid. */
.availability-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.45rem;
    min-height: 2.75rem;
    border-radius: 999px;
    border: 1px solid var(--glass-border);
    background: var(--glass-bg);
    padding: 0 1rem;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-color);
    transition: transform 300ms ease, border-color 300ms ease, background 300ms ease;
}

.availability-btn:hover {
    border-color: var(--accent-color);
    transform: translateY(-2px);
}

.availability-overlay {
    position: fixed;
    inset: 0;
    z-index: 75;
    display: none;
    overflow-y: auto;
    background: rgba(31, 46, 35, 0.4);
    padding: 1rem;
}

.availability-overlay.is-open {
    display: block;
}

.availability-panel {
    margin: 0 auto;
    max-width: 32rem;
    min-height: calc(100vh - 2rem);
    border-radius: 2.4rem;
    padding: clamp(1.5rem, 4vw, 2.5rem);
}

.cal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
}

.cal-title {
    margin: 0;
    color: var(--text-color);
    font-family: var(--font-heading);
    font-size: 1.15rem;
    font-weight: 600;
}

.cal-nav {
    display: inline-flex;
    height: 2.5rem;
    width: 2.5rem;
    align-items: center;
    justify-content: center;
    border-radius: 999px;
    border: 1px solid var(--glass-border);
    background: var(--surface-color);
    color: var(--text-color);
    cursor: pointer;
    transition: border-color 300ms ease, background 300ms ease;
}

.cal-nav:hover {
    border-color: var(--accent-color);
}

.cal-grid {
    display: grid;
    grid-template-columns: repeat(7, minmax(0, 1fr));
    gap: 0.35rem;
    margin-top: 1rem;
}

.cal-dow {
    padding-bottom: 0.3rem;
    text-align: center;
    font-size: 0.7rem;
    font-weight: 700;
    color: var(--sage-dark);
}

.cal-blank {
    min-height: 2.5rem;
}

.cal-day {
    display: inline-flex;
    min-height: 2.5rem;
    align-items: center;
    justify-content: center;
    border-radius: 0.9rem;
    border: 1px solid var(--glass-border);
    background: var(--field-bg);
    font-family: inherit;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-color);
    cursor: default;
}

.cal-day.is-blocked {
    border-color: var(--warning-color);
    background: var(--warning-soft);
    color: var(--warning-color);
    text-decoration: line-through;
}

button.cal-day {
    cursor: pointer;
}

button.cal-day.is-free:hover {
    border-color: var(--accent-color);
}

.cal-legend {
    display: inline-block;
    height: 0.9rem;
    width: 0.9rem;
    border-radius: 0.3rem;
    border: 1px solid var(--glass-border);
}

.cal-legend.is-free {
    background: var(--field-bg);
}

.cal-legend.is-blocked {
    border-color: var(--warning-color);
    background: var(--warning-soft);
}

@media (max-width: 480px) {
    .cal-grid {
        gap: 0.25rem;
    }

    .cal-day,
    .cal-blank {
        min-height: 2.25rem;
        font-size: 0.8rem;
    }
}