/**
* ADVANCED CALENDAR STYLES
* Super High-Level CSS for Calendar Section
* Enterprise-grade styling with animations and accessibility
*
* @version 7.0.0
*/

/* ====== CALENDAR SECTION ====== */
.calendar-section {
    position: relative;
    padding: var(--spacing-3xl, 4rem) 0;
    background: var(--bg-color, #ffffff);
    transition: background-color var(--transition-base, 300ms ease);
}

.calendar-container {
    max-width: var(--container-max-width, 1200px);
    margin: 0 auto;
    padding: 0 var(--spacing-md, 1rem);
}

/* ====== CALENDAR WRAPPER ====== */
.calendar-wrapper {
    position: relative;
    width: 100%;
    min-height: 600px;
    border-radius: var(--border-radius, 0.5rem);
    overflow: hidden;
    box-shadow: var(--shadow-lg, 0 10px 15px rgba(0, 0, 0, 0.1));
    background: var(--bg-color, #ffffff);
    transition: all var(--transition-base, 300ms ease);
}

.calendar-wrapper.loading {
    background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
    background-size: 200% 100%;
    animation: loading-shimmer 1.5s infinite;
}

.calendar-wrapper.loaded {
    animation: fadeIn 0.5s ease;
}

@keyframes loading-shimmer {
    0% {
        background-position: 200% 0;
    }
    100% {
        background-position: -200% 0;
    }
}

/* ====== LOADING INDICATOR ====== */
.calendar-loading-indicator {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
    z-index: 10;
    pointer-events: none;
}

.loading-spinner {
    width: 48px;
    height: 48px;
    border: 4px solid rgba(13, 110, 253, 0.1);
    border-top-color: var(--primary-color, #0d6efd);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 1rem;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

.calendar-loading-indicator p {
    color: var(--text-color, #333);
    font-size: var(--font-size-base, 1rem);
    margin: 0;
}

/* ====== CALENDAR IFRAME ====== */
.calendar-wrapper iframe {
    width: 100%;
    height: 600px;
    border: none;
    display: block;
    transition: height var(--transition-base, 300ms ease);
}

.calendar-wrapper.loading iframe {
    opacity: 0;
}

.calendar-wrapper.loaded iframe {
    opacity: 1;
    animation: fadeIn 0.5s ease;
}

/* ====== CALENDAR ACTIONS ====== */
.calendar-actions {
    display: flex;
    gap: var(--spacing-md, 1rem);
    justify-content: center;
    margin-top: var(--spacing-xl, 2rem);
    flex-wrap: wrap;
}

.calendar-btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm, 0.5rem);
    padding: var(--spacing-md, 1rem) var(--spacing-lg, 1.5rem);
    border-radius: var(--border-radius, 0.5rem);
    font-weight: 500;
    text-decoration: none;
    transition: all var(--transition-base, 300ms ease);
    cursor: pointer;
    border: 2px solid transparent;
    position: relative;
    overflow: hidden;
}

.calendar-btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.calendar-btn:hover::before {
    width: 300px;
    height: 300px;
}

.calendar-btn i {
    font-size: 1.1em;
}

.calendar-btn.btn-primary {
    background: var(--primary-color, #0d6efd);
    color: #ffffff;
}

.calendar-btn.btn-primary:hover {
    background: var(--primary-color-hover, #0b5ed7);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md, 0 4px 6px rgba(0, 0, 0, 0.1));
}

.calendar-btn.btn-outline {
    background: transparent;
    color: var(--primary-color, #0d6efd);
    border-color: var(--primary-color, #0d6efd);
}

.calendar-btn.btn-outline:hover {
    background: var(--primary-color, #0d6efd);
    color: #ffffff;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md, 0 4px 6px rgba(0, 0, 0, 0.1));
}

/* ====== ERROR STATE ====== */
.calendar-error {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
    z-index: 20;
    background: var(--bg-color, #ffffff);
    padding: var(--spacing-xl, 2rem);
    border-radius: var(--border-radius, 0.5rem);
    box-shadow: var(--shadow-xl, 0 20px 25px rgba(0, 0, 0, 0.15));
    max-width: 400px;
    width: 90%;
}

.calendar-error i {
    font-size: 3rem;
    color: var(--error-color, #dc3545);
    margin-bottom: var(--spacing-md, 1rem);
}

.calendar-error p {
    color: var(--text-color, #333);
    margin-bottom: var(--spacing-lg, 1.5rem);
}

.calendar-error .retry-calendar {
    margin-top: var(--spacing-md, 1rem);
}

/* ====== SKIP LINK ====== */
.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--primary-color, #0d6efd);
    color: #ffffff;
    padding: var(--spacing-sm, 0.5rem) var(--spacing-md, 1rem);
    text-decoration: none;
    border-radius: var(--border-radius, 0.5rem);
    z-index: 1000;
    transition: top var(--transition-fast, 150ms ease);
}

.skip-link:focus {
    top: 0;
}

/* ====== RESPONSIVE DESIGN ====== */
@media (max-width: 1024px) {
    .calendar-wrapper iframe {
        height: 550px;
    }
}

@media (max-width: 768px) {
    .calendar-section {
        padding: var(--spacing-2xl, 3rem) 0;
    }

    .calendar-wrapper {
        min-height: 500px;
    }

    .calendar-wrapper iframe {
        height: 500px;
    }

    .calendar-actions {
        flex-direction: column;
        align-items: stretch;
    }

    .calendar-btn {
        width: 100%;
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .calendar-section {
        padding: var(--spacing-xl, 2rem) 0;
    }

    .calendar-wrapper {
        min-height: 400px;
        border-radius: 0;
    }

    .calendar-wrapper iframe {
        height: 400px;
    }

    .calendar-loading-indicator {
        padding: var(--spacing-md, 1rem);
    }

    .loading-spinner {
        width: 36px;
        height: 36px;
        border-width: 3px;
    }
}

/* ====== DARK MODE ====== */
@media (prefers-color-scheme: dark) {
    .calendar-section {
        background: var(--bg-dark, #1a1a1a);
    }

    .calendar-wrapper {
        background: var(--bg-dark, #1a1a1a);
        box-shadow: var(--shadow-lg, 0 10px 15px rgba(0, 0, 0, 0.3));
    }

    .calendar-wrapper.loading {
        background: linear-gradient(90deg, #2a2a2a 25%, #1a1a1a 50%, #2a2a2a 75%);
        background-size: 200% 100%;
    }

    .calendar-loading-indicator p {
        color: var(--text-dark, #ffffff);
    }

    .calendar-error {
        background: var(--bg-dark, #1a1a1a);
    }

    .calendar-error p {
        color: var(--text-dark, #ffffff);
    }
}

.dark-mode .calendar-section {
    background: var(--bg-dark, #1a1a1a);
}

.dark-mode .calendar-wrapper {
    background: var(--bg-dark, #1a1a1a);
    box-shadow: var(--shadow-lg, 0 10px 15px rgba(0, 0, 0, 0.3));
}

.dark-mode .calendar-wrapper.loading {
    background: linear-gradient(90deg, #2a2a2a 25%, #1a1a1a 50%, #2a2a2a 75%);
    background-size: 200% 100%;
}

.dark-mode .calendar-loading-indicator p {
    color: var(--text-dark, #ffffff);
}

.dark-mode .calendar-error {
    background: var(--bg-dark, #1a1a1a);
}

.dark-mode .calendar-error p {
    color: var(--text-dark, #ffffff);
}

/* ====== ACCESSIBILITY ====== */
@media (prefers-reduced-motion: reduce) {
    .calendar-wrapper,
    .calendar-wrapper iframe,
    .calendar-btn,
    .loading-spinner {
        animation: none !important;
        transition: none !important;
    }
}

/* ====== PRINT STYLES ====== */
@media print {
    .calendar-section {
        page-break-inside: avoid;
    }

    .calendar-actions {
        display: none;
    }

    .calendar-wrapper {
        box-shadow: none;
        border: 1px solid #ccc;
    }
}