/* 공통 아이콘 스타일 */
.user-icon {
    font-size: 1.2rem;
    color: #6c757d;
}

.nav-link:hover .user-icon {
    color: #000;
}

/* Modern Navigation Styles */
.modern-navbar {
    background: linear-gradient(135deg, #ffffff 0%, #f8f9fa 100%);
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    border-bottom: 1px solid rgba(0,0,0,0.05);
    padding: 0.75rem 0;
}

.modern-navbar-brand {
    display: flex;
    align-items: center;
    font-weight: 600;
    color: var(--md-primary, #1976d2) !important;
    text-decoration: none;
    padding: 0.5rem 0;
}

.modern-navbar-brand:hover {
    color: var(--md-primary-dark, #1565c0) !important;
}

.modern-logo {
    border-radius: 8px;
}

.modern-navbar-brand:hover .modern-logo {
    box-shadow: 0 4px 12px rgba(25, 118, 210, 0.2);
}


.modern-navbar-toggler {
    border: none;
    padding: 0.5rem;
    border-radius: 8px;
}

.modern-navbar-toggler:hover {
    background-color: rgba(25, 118, 210, 0.1);
}

.modern-toggler-icon {
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba%2825, 118, 210, 0.8%29' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
}

.modern-nav-links {
    gap: 0.5rem;
}

.modern-nav-link {
    color: var(--md-on-surface, #212121) !important;
    font-weight: 500;
    padding: 0.75rem 1rem !important;
    border-radius: 8px;
    position: relative;
    text-decoration: none;
}

.modern-nav-link:hover {
    color: var(--md-primary, #1976d2) !important;
    background-color: rgba(25, 118, 210, 0.08);
}

.modern-nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--md-primary, #1976d2), var(--md-secondary, #dc004e));
    transform: translateX(-50%);
}

.modern-nav-link:hover::after {
    width: 80%;
}

.modern-dropdown-menu {
    background: white;
    border: none;
    border-radius: 12px;
    box-shadow: 0 8px 24px rgba(0,0,0,0.15);
    padding: 0.5rem 0;
    margin-top: 0.5rem;
}

.modern-dropdown-menu .dropdown-item {
    padding: 0.75rem 1.5rem;
    color: var(--md-on-surface, #212121);
    border-radius: 0;
}

.modern-dropdown-menu .dropdown-item:hover {
    background-color: rgba(25, 118, 210, 0.08);
    color: var(--md-primary, #1976d2);
}

.modern-user-menu {
    gap: 1rem;
}

.modern-notification-link {
    position: relative;
    padding: 0.75rem !important;
    border-radius: 50%;
}

.modern-notification-link:hover {
    background-color: rgba(25, 118, 210, 0.1);
}

.modern-notification-wrapper {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
}

.modern-notification-icon {
    font-size: 1.25rem;
    color: var(--md-on-surface, #212121);
}

.modern-notification-link:hover .modern-notification-icon {
    color: var(--md-primary, #1976d2);
}

.modern-notification-badge {
    position: absolute;
    top: -5px;
    right: -5px;
    font-size: 0.7rem;
    min-width: 1.2rem;
    height: 1.2rem;
    display: flex;
    align-items: center;
    justify-content: center;
}

.modern-notification-dropdown {
    min-width: 320px;
    max-height: 400px;
    overflow-y: auto;
}

.modern-user-link {
    position: relative;
    padding: 0.75rem !important;
    border-radius: 50%;
}

.modern-user-link:hover {
    background-color: rgba(25, 118, 210, 0.1);
}

.modern-user-icon {
    font-size: 1.25rem;
    color: var(--md-on-surface, #212121);
}

.modern-user-link:hover .modern-user-icon {
    color: var(--md-primary, #1976d2);
}

.modern-user-dropdown {
    min-width: 200px;
}

/* Mobile Responsive */
@media (max-width: 768px) {
    .modern-navbar {
        padding: 0.5rem 0;
    }
    
    .modern-navbar-brand {
        gap: 0.5rem;
    }
    
    .modern-nav-links {
        gap: 0.25rem;
    }
    
    .modern-nav-link {
        padding: 0.5rem 0.75rem !important;
        font-size: 0.9rem;
    }
    
    .modern-user-menu {
        gap: 0.5rem;
    }
    
    .modern-notification-dropdown {
        min-width: 280px;
    }
}

/* 알림 드롭다운 스타일 */
.modern-dropdown {
    box-shadow: 0 0.5rem 1rem rgba(0, 0, 0, 0.15);
    border: 1px solid rgba(0, 0, 0, 0.1);
}

.notification-list {
    max-height: 400px;
    overflow-y: auto;
}

.dropdown-header {
    padding: 0.75rem 1rem;
    font-weight: 500;
    border-bottom: 1px solid #dee2e6;
    background-color: #f8f9fa;
}

.dropdown-item {
    padding: 0.75rem 1rem;
}

.dropdown-item:hover {
    background-color: #f8f9fa;
}

.notification-item {
    border-left: 3px solid transparent;
}

.notification-item.unread {
    background-color: #f0f7ff;
    border-left: 3px solid #0d6efd;
    font-weight: 500;
}

.notification-item.unread:hover {
    background-color: #e5f1ff;
}

.notification-item:not(.unread) {
    background-color: #ffffff;
    color: #6c757d;
}

.notification-item:not(.unread):hover {
    background-color: #f8f9fa;
}

.notification-item:not(.unread) .notification-title {
    color: #495057;
}

.notification-item .notification-time {
    font-size: 0.8rem;
    color: #6c757d;
}

/* 알림 뱃지 스타일 */
.notification-icon-wrapper .badge.bg-danger {
    font-size: 0.75rem;
    padding: 0.25em 0.5em;
    min-width: 1.2em;
    height: 1.2em;
    line-height: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    transform: translate(75%, -65%) !important;
    position: absolute;
    top: 0;
    right: 0;
}

.notification-icon-wrapper {
    position: relative;
    display: inline-block;
}

/* 알림 내용 스타일 */
.fw-500 {
    font-weight: 500;
}

.min-width-0 {
    min-width: 0;
}

.text-truncate {
    max-width: 250px;
}

.delete-notification {
    opacity: 0;
    padding: 0.25rem 0.5rem;
    margin-left: 0.5rem;
}

.notification-item:hover .delete-notification {
    opacity: 1;
}

.delete-notification:hover {
    color: #dc3545 !important;
}

.student-id {
    text-decoration: none !important;
    color: inherit !important;
    cursor: text !important;
    pointer-events: none !important;
    -webkit-text-fill-color: inherit !important;
}

/* 필터 스타일 */
.filter-collapse .card {
    border: none;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.filter-collapse .card-header {
    background: none;
    border-bottom: none;
    padding: 0.75rem 1rem;
}

.filter-collapse .btn-link {
    color: #333;
    font-weight: 500;
    padding: 0;
}

.filter-collapse .btn-link:hover,
.filter-collapse .btn-link:focus {
    color: #007bff;
    text-decoration: none;
}

.filter-collapse .fa-chevron-down {
    transform: rotate(180deg);
}

.filter-collapse .collapsed .fa-chevron-down {
    transform: rotate(0deg);
}

.filter-count {
    font-size: 0.8rem;
    padding: 0.25rem 0.5rem;
}

.quick-date-filters {
    gap: 0.5rem;
    flex-wrap: wrap;
}

.quick-date-filters .btn {
    padding: 0.375rem 0.75rem;
    font-size: 0.875rem;
}

.input-group-text {
    background-color: #f8f9fa;
    border-color: #ced4da;
}

.input-group-text i {
    width: 1rem;
    text-align: center;
    color: #6c757d;
}

.form-select,
.form-control,
.input-group-text {
    border-color: #ced4da;
}

.form-select:focus,
.form-control:focus {
    border-color: #80bdff;
    box-shadow: 0 0 0 0.2rem rgba(0,123,255,0.25);
}

/* 모바일 대응 */
@media (max-width: 768px) {
    .quick-date-filters {
        width: 100%;
        justify-content: stretch;
    }
    
    .quick-date-filters .btn {
        flex: 1;
        white-space: nowrap;
        padding: 0.375rem 0.5rem;
        font-size: 0.75rem;
    }

    .filter-collapse .card-body {
        padding: 1rem 0.5rem;
    }

    .input-group {
        margin-bottom: 0.5rem;
    }
}

/* Flatpickr 커스텀 스타일 */
.flatpickr-calendar {
    box-shadow: 0 4px 6px rgba(0,0,0,0.1) !important;
    border: 1px solid #e9ecef !important;
}

.flatpickr-day.selected,
.flatpickr-day.startRange,
.flatpickr-day.endRange,
.flatpickr-day.selected.inRange,
.flatpickr-day.startRange.inRange,
.flatpickr-day.endRange.inRange,
.flatpickr-day.selected:focus,
.flatpickr-day.startRange:focus,
.flatpickr-day.endRange:focus,
.flatpickr-day.selected:hover,
.flatpickr-day.startRange:hover,
.flatpickr-day.endRange:hover,
.flatpickr-day.selected.prevMonthDay,
.flatpickr-day.startRange.prevMonthDay,
.flatpickr-day.endRange.prevMonthDay,
.flatpickr-day.selected.nextMonthDay,
.flatpickr-day.startRange.nextMonthDay,
.flatpickr-day.endRange.nextMonthDay {
    background: #007bff !important;
    border-color: #007bff !important;
}

.flatpickr-day.selected.startRange + .endRange:not(:nth-child(7n+1)),
.flatpickr-day.startRange.startRange + .endRange:not(:nth-child(7n+1)),
.flatpickr-day.endRange.startRange + .endRange:not(:nth-child(7n+1)) {
    box-shadow: -10px 0 0 #007bff !important;
}

/* Excel Validation Styles */
.validation-container {
    max-width: 800px;
    margin: 2rem auto;
    padding: 1rem;
}

.upload-section {
    background: #f8f9fa;
    padding: 2rem;
    border-radius: 8px;
    margin-bottom: 2rem;
}

.results-section {
    background: #fff;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.summary {
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid #dee2e6;
}

.error-details {
    margin-bottom: 2rem;
}

.error-item {
    background: #fff8f8;
    padding: 1rem;
    margin-bottom: 1rem;
    border-left: 4px solid #dc3545;
    border-radius: 4px;
}

.error-item h4 {
    color: #dc3545;
    margin-bottom: 0.5rem;
}

.error-item ul {
    margin: 0;
    padding-left: 1.5rem;
}

.actions {
    text-align: center;
    margin-top: 2rem;
}

#proceedButton {
    min-width: 200px;
}