/* Enhanced Interview Calendar Grid Layout - Optimized Performance */

/* CSS Custom Properties for Theming and Performance */
:root {
    --calendar-primary: #007bff;
    --calendar-primary-dark: #0056b3;
    --calendar-secondary: #6c757d;
    --calendar-success: #28a745;
    --calendar-danger: #dc3545;
    --calendar-warning: #ffc107;
    --calendar-info: #17a2b8;
    --calendar-light: #f8f9fa;
    --calendar-dark: #343a40;
    
    /* Animation timing functions */
    --ease-out-back: cubic-bezier(0.175, 0.885, 0.32, 1.275);
    --ease-in-out-quart: cubic-bezier(0.77, 0, 0.175, 1);
    --ease-out-quart: cubic-bezier(0.25, 1, 0.5, 1);
    
    /* Shadow definitions */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.15);
    --shadow-lg: 0 8px 16px rgba(0, 0, 0, 0.2);
    --shadow-xl: 0 12px 24px rgba(0, 0, 0, 0.25);
}

/* Main Container with Zoom Support */
.interview-calendar-advanced-container {
    --calendar-zoom: 1;
    --cell-height: 50px;
    --appointment-font-size: 0.75rem;
    --appointment-padding: 4px;
    padding: 1.25rem;
    background-color: var(--calendar-light);
    min-height: 100vh;
    position: relative;
    /* Enable hardware acceleration */
    transform: translateZ(0);
    will-change: transform;
}

/* Optimized Zoom Controls */
.calendar-zoom-controls {
    position: fixed;
    top: 50%;
    right: 1.25rem;
    transform: translateY(-50%) translateZ(0);
    z-index: 1000;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    background: rgba(255, 255, 255, 0.95);
    padding: 0.75rem;
    border-radius: 0.75rem;
    box-shadow: var(--shadow-lg);
    backdrop-filter: blur(10px);
    /* Optimize for performance */
    will-change: transform;
    contain: layout style paint;
}

.zoom-button {
    width: 2.5rem;
    height: 2.5rem;
    border: none;
    border-radius: 0.5rem;
    background: var(--calendar-primary);
    color: white;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s var(--ease-out-quart);
    display: flex;
    align-items: center;
    justify-content: center;
    /* Optimize for animations */
    will-change: transform, background-color;
    transform: translateZ(0);
}

.zoom-button:hover {
    background: var(--calendar-primary-dark);
    transform: scale(1.1) translateZ(0);
}

.zoom-button:active {
    transform: scale(0.95) translateZ(0);
}

.zoom-button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

.zoom-level {
    text-align: center;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--calendar-secondary);
    padding: 0.25rem 0;
}

/* Enhanced Calendar Grid with Performance Optimizations */
.enhanced-calendar {
    transform: scale(var(--calendar-zoom)) translateZ(0);
    transform-origin: top left;
    width: calc(100% / var(--calendar-zoom));
    height: calc(100% / var(--calendar-zoom));
    transition: transform 0.3s var(--ease-out-quart);
    /* Optimize for performance */
    will-change: transform;
    contain: layout style paint;
}

/* Optimized Grid Layout for Schedule Table */
.enhanced-schedule-table {
    width: 100%;
    table-layout: fixed;
    border-collapse: separate;
    border-spacing: 0;
    border-radius: 0.75rem;
    overflow: hidden;
    box-shadow: var(--shadow-md);
    background: white;
    /* Optimize table rendering */
    contain: layout style paint;
}

.enhanced-schedule-table thead th {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    font-weight: 600;
    text-align: center;
    padding: 1rem 0.5rem;
    border: none;
    position: sticky;
    top: 0;
    z-index: 10;
    /* Optimize sticky positioning */
    will-change: transform;
}

.enhanced-schedule-table thead th:first-child {
    width: 6.25rem;
    min-width: 6.25rem;
}

/* Equal width columns for days */
.enhanced-schedule-table thead th:not(:first-child) {
    width: calc((100% - 6.25rem) / 7);
}

/* Optimized Time Slot Styling */
.time-slot {
    background: linear-gradient(135deg, var(--calendar-light) 0%, #e9ecef 100%);
    font-weight: 600;
    text-align: center;
    vertical-align: middle;
    border-right: 2px solid #dee2e6;
    position: sticky;
    left: 0;
    z-index: 5;
    width: 6.25rem;
    min-width: 6.25rem;
    /* Optimize sticky positioning */
    will-change: transform;
    contain: layout style paint;
}

/* Performance-optimized Schedule Rows */
.schedule-row {
    height: calc(var(--cell-height) * var(--calendar-zoom));
    border: none;
    /* Enable hardware acceleration for animations */
    transform: translateZ(0);
}

.schedule-row:nth-child(even) {
    background: rgba(248, 249, 250, 0.5);
}

.schedule-row:hover {
    background: rgba(13, 110, 253, 0.05);
    /* Optimize hover animations */
    will-change: background-color;
}

/* Optimized Schedule Cells */
.schedule-cell {
    position: relative;
    border: 1px solid #e9ecef;
    border-right: 1px solid #dee2e6;
    padding: 0;
    margin: 0;
    vertical-align: top;
    cursor: pointer;
    transition: all 0.2s var(--ease-out-quart);
    height: calc(var(--cell-height) * var(--calendar-zoom));
    overflow: hidden;
    /* Optimize for performance */
    will-change: background-color, border-color;
    contain: layout style paint;
}

.schedule-cell:hover {
    background: linear-gradient(135deg, rgba(13, 110, 253, 0.1) 0%, rgba(13, 110, 253, 0.05) 100%);
    border-color: var(--calendar-primary);
    /* Use transform for better performance */
    transform: translateZ(0);
}

.schedule-cell.current-time {
    background: linear-gradient(135deg, rgba(13, 110, 253, 0.15) 0%, rgba(13, 110, 253, 0.08) 100%);
    border: 2px solid var(--calendar-primary);
    animation: pulse-glow 2s infinite;
    /* Optimize animation performance */
    will-change: box-shadow;
}

/* Optimized pulse animation */
@keyframes pulse-glow {
    0%, 100% { 
        box-shadow: 0 0 5px rgba(13, 110, 253, 0.5);
        transform: translateZ(0);
    }
    50% { 
        box-shadow: 0 0 20px rgba(13, 110, 253, 0.8);
        transform: translateZ(0);
    }
}

/* Performance-optimized Enhanced Appointment Styling */
.enhanced-appointment-slot {
    position: absolute;
    top: 2px;
    left: 2px;
    right: 2px;
    height: calc(100% - 4px);
    border-radius: 0.5rem;
    cursor: move;
    transition: all 0.2s var(--ease-out-quart);
    background: linear-gradient(135deg, var(--appointment-bg, var(--calendar-primary)) 0%, var(--appointment-bg-dark, var(--calendar-primary-dark)) 100%);
    border: 2px solid transparent;
    padding: var(--appointment-padding);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    /* Optimize for animations */
    will-change: transform, box-shadow, border-color;
    transform: translateZ(0);
    contain: layout style paint;
}

.enhanced-appointment-slot:hover {
    transform: scale(1.02) translateZ(0);
    box-shadow: var(--shadow-md);
    border-color: rgba(255, 255, 255, 0.5);
    z-index: 100;
}

/* Highly optimized Floating Overlay Expanded Appointment Styles */
.enhanced-appointment-slot.appointment-expanded {
    position: fixed !important;
    cursor: default;
    overflow: visible;
    width: 30rem !important;
    height: 34.375rem !important;
    max-width: 90vw;
    max-height: 90vh;
    background: linear-gradient(135deg, #ffffff 0%, #f8f9fb 100%);
    color: #333;
    border: 2px solid var(--calendar-primary);
    border-radius: 1.25rem;
    box-shadow: 
        0 1.5625rem 3.125rem rgba(0, 0, 0, 0.25),
        0 0 0 1px rgba(255, 255, 255, 0.8),
        inset 0 1px 0 rgba(255, 255, 255, 0.9);
    z-index: 10000 !important;
    animation: expandFromOriginal 0.6s var(--ease-out-back);
    backdrop-filter: blur(20px);
    transform-origin: center center;
    /* Always center regardless of scrolling */
    top: 50% !important;
    left: 50% !important;
    transform: translate(-50%, -50%) !important;
    margin: 0 !important;
    /* Optimize for complex animations */
    will-change: transform, opacity, border-radius, filter;
    contain: layout style paint;
}

/* Optimized glass-morphism backdrop */
.enhanced-appointment-slot.appointment-expanded::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at center, rgba(0, 123, 255, 0.15) 0%, rgba(0, 0, 0, 0.4) 100%);
    backdrop-filter: blur(8px) saturate(150%);
    z-index: -1;
    pointer-events: none;
    animation: backdropFadeIn 0.4s var(--ease-out-quart);
    /* Optimize backdrop performance */
    will-change: opacity, backdrop-filter;
}

/* Optimized animations with hardware acceleration */
@keyframes backdropFadeIn {
    0% {
        opacity: 0;
        backdrop-filter: blur(0px) saturate(100%);
        transform: translateZ(0);
    }
    100% {
        opacity: 1;
        backdrop-filter: blur(8px) saturate(150%);
        transform: translateZ(0);
    }
}

@keyframes expandFromOriginal {
    0% {
        transform: translate(-50%, -50%) scale(0.3) rotate(-2deg) translateZ(0);
        opacity: 0;
        border-radius: 0.5rem;
        filter: blur(4px);
    }
    40% {
        transform: translate(-50%, -50%) scale(1.1) rotate(1deg) translateZ(0);
        opacity: 0.8;
        border-radius: 0.9375rem;
        filter: blur(1px);
    }
    100% {
        transform: translate(-50%, -50%) scale(1) rotate(0deg) translateZ(0);
        opacity: 1;
        border-radius: 1.25rem;
        filter: blur(0px);
    }
}

/* Optimized collapse animation */
.enhanced-appointment-slot.appointment-collapsing {
    animation: collapseToOriginal 0.4s cubic-bezier(0.55, 0.055, 0.675, 0.19) forwards;
    will-change: transform, opacity, border-radius, filter;
}

@keyframes collapseToOriginal {
    0% {
        transform: translate(-50%, -50%) scale(1) rotate(0deg) translateZ(0);
        opacity: 1;
        border-radius: 1.25rem;
        filter: blur(0px);
    }
    60% {
        transform: translate(-50%, -50%) scale(0.7) rotate(-1deg) translateZ(0);
        opacity: 0.6;
        border-radius: 0.75rem;
        filter: blur(2px);
    }
    100% {
        transform: translate(-50%, -50%) scale(0.1) rotate(-3deg) translateZ(0);
        opacity: 0;
        border-radius: 0.375rem;
        filter: blur(8px);
    }
}

/* Performance-optimized content for overlay */
.appointment-expanded-content {
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
    height: 100%;
    font-size: calc(0.9rem * var(--calendar-zoom));
    position: relative;
    z-index: 1;
    background: rgba(255, 255, 255, 0.02);
    border-radius: 1.125rem;
    backdrop-filter: blur(20px);
    width: 100%;
    box-sizing: border-box;
    /* Optimize for scrolling */
    contain: layout style paint;
}

/* Optimized header layout */
.appointment-expanded-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 0.75rem;
    border-bottom: 2px solid rgba(13, 110, 253, 0.1);
    padding-bottom: 1rem;
    position: relative;
    min-height: 3.75rem;
    flex-wrap: nowrap;
    width: 100%;
    /* Optimize for layout calculations */
    contain: layout style;
}

.appointment-expanded-header::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 3.75rem;
    height: 2px;
    background: linear-gradient(90deg, var(--calendar-primary), transparent);
    border-radius: 1px;
}

/* Optimized title with better text rendering */
.appointment-expanded-title {
    font-weight: 700;
    font-size: clamp(1rem, calc(1.2rem * var(--calendar-zoom)), 1.3rem);
    color: #1a1a1a;
    line-height: 1.3;
    flex: 1;
    margin: 0;
    background: linear-gradient(135deg, #1a1a1a 0%, #333 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    word-wrap: break-word;
    overflow-wrap: break-word;
    hyphens: auto;
    white-space: normal;
    min-width: 0;
    width: auto;
    max-width: 20rem;
    padding-right: 0.625rem;
    /* Optimize text rendering */
    text-rendering: optimizeLegibility;
    font-feature-settings: "liga" 1, "kern" 1;
}

/* Optimized status badge */
.appointment-expanded-status {
    padding: 0.5rem 0.75rem;
    border-radius: 1.25rem;
    font-size: clamp(0.65rem, calc(0.7rem * var(--calendar-zoom)), 0.8rem);
    font-weight: 600;
    white-space: nowrap;
    text-transform: uppercase;
    letter-spacing: 0.03125rem;
    box-shadow: 
        var(--shadow-sm),
        inset 0 1px 0 rgba(255, 255, 255, 0.3);
    position: relative;
    overflow: hidden;
    flex-shrink: 0;
    align-self: flex-start;
    max-width: 7.5rem;
    text-align: center;
    /* Optimize for animations */
    will-change: background-color;
    contain: layout style paint;
}

/* Optimized body with better scrolling */
.appointment-expanded-body {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 0.875rem;
    padding-right: 0.5rem;
    min-height: 0;
    padding-bottom: 5rem;
    overflow-y: auto;
    max-height: calc(100% - 7.5rem);
    /* Optimize scrolling performance */
    -webkit-overflow-scrolling: touch;
    scroll-behavior: smooth;
    contain: layout style;
}

/* Optimized custom scrollbar */
.appointment-expanded-body::-webkit-scrollbar {
    width: 0.375rem;
}

.appointment-expanded-body::-webkit-scrollbar-track {
    background: rgba(0, 0, 0, 0.05);
    border-radius: 0.1875rem;
}

.appointment-expanded-body::-webkit-scrollbar-thumb {
    background: linear-gradient(45deg, var(--calendar-primary), var(--calendar-primary-dark));
    border-radius: 0.1875rem;
}

/* Optimized body item styling */
.appointment-expanded-body > div {
    display: flex;
    align-items: center;
    gap: 0.875rem;
    color: #4a5568;
    font-size: calc(0.85rem * var(--calendar-zoom));
    line-height: 1.6;
    padding: 0.625rem 0;
    border-radius: 0.5rem;
    transition: all 0.2s var(--ease-out-quart);
    /* Optimize for hover animations */
    will-change: background-color, transform;
    contain: layout style paint;
}

.appointment-expanded-body > div:hover {
    background: rgba(13, 110, 253, 0.05);
    transform: translateX(0.25rem) translateZ(0);
}

/* Optimized icons */
.appointment-expanded-body i {
    width: 1.25rem;
    height: 1.25rem;
    color: var(--calendar-primary);
    font-size: calc(0.9rem * var(--calendar-zoom));
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(13, 110, 253, 0.1);
    border-radius: 50%;
    padding: 0.25rem;
    /* Optimize for consistency */
    contain: layout style paint;
}

/* Optimized time display */
.appointment-expanded-time {
    font-weight: 600;
    color: #2d3748;
    background: linear-gradient(135deg, rgba(13, 110, 253, 0.1) 0%, rgba(13, 110, 253, 0.05) 100%);
    padding: 0.75rem 1rem;
    border-radius: 0.75rem;
    border-left: 0.25rem solid var(--calendar-primary);
    box-shadow: var(--shadow-sm);
}

/* Performance-optimized action buttons */
.appointment-expanded-actions {
    display: flex;
    gap: 0.375rem;
    justify-content: center;
    align-items: center;
    position: absolute;
    bottom: 0.9375rem;
    right: 0.9375rem;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(15px);
    border-radius: 0.75rem;
    padding: 0.5rem 0.75rem;
    box-shadow: var(--shadow-sm);
    border: 1px solid rgba(13, 110, 253, 0.1);
    max-width: 25rem;
    flex-wrap: wrap;
    max-height: 5rem;
    overflow-y: auto;
    overflow-x: hidden;
    /* Optimize for performance */
    contain: layout style paint;
}

/* Standardized action buttons to match site-wide button styles */
.calendar-action-btn {
    width: 36px;
    height: 36px;
    padding: 0 !important;
    border-radius: 8px !important;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0 !important;
}

.calendar-action-btn i {
    margin: 0 !important;
    font-size: 0.95rem;
}

/* Backward compatibility: keep legacy class behaving like standardized buttons */
.appointment-btn-expanded {
    width: 36px;
    height: 36px;
    border: none;
    border-radius: 8px;
    font-size: 0.875rem;
    cursor: pointer;
    transition: all 0.2s ease-out;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.appointment-btn-expanded i {
    margin: 0;
}

/* Optimized close button */
.appointment-expanded-close {
    position: absolute;
    top: -0.75rem;
    right: -0.75rem;
    width: 2.25rem;
    height: 2.25rem;
    background: linear-gradient(135deg, #ff4757 0%, #ff3742 100%);
    color: white;
    border: 2px solid white;
    border-radius: 50%;
    cursor: pointer;
    font-size: 1rem;
    font-weight: bold;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 
        var(--shadow-sm),
        inset 0 1px 0 rgba(255, 255, 255, 0.3);
    transition: all 0.3s var(--ease-out-back);
    z-index: 10;
    /* Optimize for animations */
    will-change: transform, background-color, box-shadow;
    transform: translateZ(0);
}

.appointment-expanded-close::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at center, rgba(255, 255, 255, 0.3) 0%, transparent 70%);
    border-radius: 50%;
    opacity: 0;
    transition: opacity 0.3s var(--ease-out-quart);
}

.appointment-expanded-close:hover {
    background: linear-gradient(135deg, #ff3742 0%, #ff2233 100%);
    transform: scale(1.2) rotate(90deg) translateZ(0);
    box-shadow: 
        var(--shadow-md),
        inset 0 1px 0 rgba(255, 255, 255, 0.4);
}

.appointment-expanded-close:hover::before {
    opacity: 1;
}

.appointment-expanded-close:active {
    transform: scale(1.1) rotate(90deg) translateZ(0);
}

/* Optimized button color variations */
.appointment-btn-expanded.btn-edit {
    background: linear-gradient(135deg, var(--calendar-primary) 0%, var(--calendar-primary-dark) 100%);
}

.appointment-btn-expanded.btn-confirm {
    background: linear-gradient(135deg, var(--calendar-success) 0%, #1e7e34 100%);
}

.appointment-btn-expanded.btn-complete {
    background: linear-gradient(135deg, var(--calendar-info) 0%, #117a8b 100%);
}

.appointment-btn-expanded.btn-approve {
    background: linear-gradient(135deg, var(--calendar-success) 0%, #1e7e34 100%);
}

.appointment-btn-expanded.btn-deny {
    background: linear-gradient(135deg, var(--calendar-danger) 0%, #c82333 100%);
}

.appointment-btn-expanded.btn-reschedule {
    background: linear-gradient(135deg, var(--calendar-warning) 0%, #e0a800 100%);
    color: #212529;
}

.appointment-btn-expanded.btn-cancel {
    background: linear-gradient(135deg, var(--calendar-danger) 0%, #c82333 100%);
}

.appointment-btn-expanded.btn-notify {
    background: linear-gradient(135deg, #6f42c1 0%, #5a32a3 100%);
}

.appointment-btn-expanded.btn-pdf {
    background: linear-gradient(135deg, #fd7e14 0%, #e55a00 100%);
}

.appointment-btn-expanded.btn-delete {
    background: linear-gradient(135deg, var(--calendar-danger) 0%, #c82333 100%);
}

.appointment-btn-expanded.btn-details {
    background: linear-gradient(135deg, var(--calendar-secondary) 0%, #545b62 100%);
}

/* Responsive optimizations */
@media (max-width: 768px) {
    .enhanced-appointment-slot.appointment-expanded {
        width: 95vw !important;
        height: 85vh !important;
        max-width: 95vw !important;
        max-height: 85vh !important;
        border-radius: 1rem;
        animation: expandFromOriginalMobile 0.5s var(--ease-out-back);
        top: 50% !important;
        left: 50% !important;
        transform: translate(-50%, -50%) !important;
    }
    
    .appointment-expanded-title {
        font-size: clamp(0.9rem, calc(1.1rem * var(--calendar-zoom)), 1.2rem);
        line-height: 1.2;
        max-width: 15.625rem;
    }
    
    .appointment-expanded-actions {
        bottom: 0.9375rem;
        right: 0.9375rem;
        gap: 0.5rem;
        padding: 0.375rem;
    }
    
    .appointment-btn-expanded {
        width: calc(2.5rem * var(--calendar-zoom));
        height: calc(2.5rem * var(--calendar-zoom));
        font-size: calc(0.875rem * var(--calendar-zoom));
    }
    
    .interview-calendar-advanced-container {
        padding: 1rem;
    }
    
    .calendar-zoom-controls {
        right: 1rem;
        gap: 0.375rem;
        padding: 0.5rem;
    }
    
    .zoom-button {
        width: 2.25rem;
        height: 2.25rem;
        font-size: 0.875rem;
    }
}

/* Extra small mobile optimizations */
@media (max-width: 480px) {
    .enhanced-appointment-slot.appointment-expanded {
        width: 98vw !important;
        height: 90vh !important;
        border-radius: 0.75rem;
        top: 50% !important;
        left: 50% !important;
        transform: translate(-50%, -50%) !important;
    }
    
    .appointment-expanded-title {
        font-size: clamp(0.8rem, calc(1rem * var(--calendar-zoom)), 1.1rem);
        line-height: 1.2;
        max-width: 12.5rem;
    }
    
    .appointment-expanded-actions {
        bottom: 0.75rem;
        right: 0.75rem;
        gap: 0.375rem;
        padding: 0.25rem;
    }
    
    .appointment-btn-expanded {
        width: 2.25rem;
        height: 2.25rem;
        font-size: 0.75rem;
    }
    
    .interview-calendar-advanced-container {
        padding: 0.75rem;
    }
}

/* Reduced motion preferences */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
    
    .enhanced-appointment-slot.appointment-expanded {
        animation: none;
        transform: translate(-50%, -50%) !important;
    }
    
    .appointment-expanded-close:hover {
        transform: scale(1.1) translateZ(0);
    }
    
    .appointment-btn-expanded:hover {
        transform: scale(1.05) translateZ(0);
    }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    .enhanced-appointment-slot {
        border: 3px solid currentColor;
        background: var(--calendar-light);
        color: var(--calendar-dark);
    }
    
    .appointment-expanded-close {
        border: 3px solid currentColor;
    }
    
    .appointment-btn-expanded,
    .calendar-action-btn {
        border: 2px solid currentColor !important;
    }
}

/* Prevent text selection while dragging/resizing */
.calendar-dragging-no-select, .calendar-dragging-no-select * {
    -webkit-user-select: none !important;
    -moz-user-select: none !important;
    -ms-user-select: none !important;
    user-select: none !important;
}