/* ============================================
   LTIA Application Styles (v3.0 - Modern UI)
   Based on HiFi Design System
   ============================================ */

/* ============================================
   BASE & LAYOUT
   ============================================ */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font-family);
    color: var(--color-text-primary);
    background-color: var(--color-gray-50);
    line-height: var(--line-height-normal);
    min-height: 100vh;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--spacing-3xl);
}

.container-sm {
    max-width: 800px;
}

.container-md {
    max-width: 1000px;
}

/* ============================================
   HEADER & NAVIGATION
   ============================================ */
.header {
    background: linear-gradient(135deg, #2563eb 0%, #1e40af 100%);
    color: white;
    padding: var(--spacing-lg) 0;
    box-shadow: var(--shadow-md);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.header-content {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--spacing-3xl);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-bold);
    color: white;
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.logo-icon {
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-xl);
}

.header-nav {
    display: flex;
    gap: var(--spacing-2xl);
    align-items: center;
}

.nav-link {
    color: white;
    text-decoration: none;
    font-weight: var(--font-weight-medium);
    font-size: var(--font-size-sm);
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
    opacity: 0.9;
}

.nav-link:hover {
    opacity: 1;
    background: rgba(255, 255, 255, 0.1);
}

.nav-link.active {
    background: rgba(255, 255, 255, 0.2);
    opacity: 1;
}

.nav-button {
    background: white;
    color: var(--color-primary-dark);
    padding: var(--spacing-sm) var(--spacing-xl);
    border-radius: var(--radius-md);
    font-weight: var(--font-weight-semibold);
    border: none;
    cursor: pointer;
    transition: all var(--transition-base);
}

.nav-button:hover {
    background: var(--color-gray-100);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

/* ============================================
   SECTIONS & PAGES
   ============================================ */
.section {
    display: none;
    min-height: calc(100vh - 80px);
    padding: var(--spacing-4xl) 0;
}

.section.active {
    display: block;
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-4xl);
}

.section-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, #3b82f6 0%, #2563eb 100%);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--spacing-2xl);
    font-size: 2.5rem;
    color: white;
}

.section-title {
    font-size: var(--font-size-4xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-md);
    line-height: var(--line-height-tight);
}

.section-subtitle {
    font-size: var(--font-size-lg);
    color: var(--color-text-tertiary);
    line-height: var(--line-height-relaxed);
    max-width: 600px;
    margin: 0 auto;
}

/* ============================================
   LTI LAUNCH SECTION
   ============================================ */
#ltiLaunchSection {
    background: linear-gradient(135deg, #eff6ff 0%, #dbeafe 100%);
}

.launch-container {
    max-width: 900px;
    margin: 0 auto;
    padding: var(--spacing-2xl) var(--spacing-lg);
}

.launch-card {
    background: white;
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
}

.launch-card-header {
    background: linear-gradient(135deg, #2563eb 0%, #1e40af 100%);
    color: white;
    padding: var(--spacing-3xl);
    text-align: center;
}

.launch-card-icon {
    width: 64px;
    height: 64px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-xl);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--spacing-lg);
    font-size: 2rem;
}

.launch-card-title {
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--spacing-sm);
}

.launch-card-subtitle {
    font-size: var(--font-size-sm);
    opacity: 0.9;
}

.launch-card-body {
    padding: var(--spacing-4xl) var(--spacing-3xl);
}

/* Known Users Section */
.known-users-section {
    margin-bottom: var(--spacing-3xl);
    padding-bottom: var(--spacing-3xl);
    border-bottom: 1px solid var(--color-border);
}

.known-users-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.known-users-icon {
    width: 32px;
    height: 32px;
    background: var(--color-bg-blue);
    color: var(--color-primary);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-lg);
}

.known-users-title {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-primary);
    flex: 1;
}

/* Quick Launch */
.quick-launch-section {
    margin-bottom: var(--spacing-2xl);
}

.quick-launch-title {
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-lg);
    text-align: center;
}

/* Manual Launch Form */
.manual-launch-section {
    margin-top: var(--spacing-3xl);
    padding-top: var(--spacing-3xl);
    border-top: 1px solid var(--color-border);
}

.form-section-header {
    margin-bottom: var(--spacing-2xl);
}

.form-section-title {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-sm);
}

.form-section-description {
    font-size: var(--font-size-sm);
    color: var(--color-text-tertiary);
}

.form-row {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-lg);
}

.form-row-single {
    grid-template-columns: 1fr;
}

/* Role Toggle */
.role-toggle {
    display: flex;
    gap: var(--spacing-md);
    background: var(--color-bg-secondary);
    padding: var(--spacing-xs);
    border-radius: var(--radius-lg);
}

.role-option {
    flex: 1;
    padding: var(--spacing-md);
    background: transparent;
    border: none;
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: all var(--transition-base);
}

.role-option:hover {
    color: var(--color-text-primary);
}

.role-option.active {
    background: white;
    color: var(--color-primary);
    box-shadow: var(--shadow-sm);
}

/* ============================================
   COURSE SETUP SECTION
   ============================================ */
.setup-container {
    max-width: 800px;
    margin: 0 auto;
}

.setup-header {
    text-align: center;
    margin-bottom: var(--spacing-4xl);
}

.setup-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, #10b981 0%, #059669 100%);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--spacing-2xl);
    font-size: 2.5rem;
    color: white;
}

.setup-title {
    font-size: var(--font-size-3xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-md);
}

.setup-description {
    font-size: var(--font-size-base);
    color: var(--color-text-tertiary);
    line-height: var(--line-height-relaxed);
}

.setup-card {
    background: white;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: var(--spacing-3xl);
    margin-bottom: var(--spacing-2xl);
    transition: all var(--transition-base);
}

.setup-card:hover {
    border-color: var(--color-primary);
    box-shadow: var(--shadow-md);
}

.setup-card-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-2xl);
}

.setup-card-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-xl);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-xl);
    flex-shrink: 0;
}

.setup-card-content {
    flex: 1;
}

.setup-card-title {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-xs);
}

.setup-card-subtitle {
    font-size: var(--font-size-sm);
    color: var(--color-text-tertiary);
}

.setup-note {
    background: var(--color-bg-blue-light);
    border: 1px solid var(--color-border-blue);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-md);
    margin-top: var(--spacing-2xl);
}

.setup-note-icon {
    color: var(--color-primary);
    font-size: var(--font-size-lg);
    margin-top: 2px;
}

.setup-note-text {
    font-size: var(--font-size-sm);
    color: var(--color-primary-darker);
    line-height: var(--line-height-normal);
}

/* Course Setup Header (Similar to Product Management) */
.course-setup-header {
    background: linear-gradient(135deg, #2563eb 0%, #1e40af 100%);
    color: white;
    padding: var(--spacing-3xl);
    border-radius: var(--radius-2xl) var(--radius-2xl) 0 0;
    margin-bottom: var(--spacing-3xl);
}

.course-setup-title {
    font-size: var(--font-size-3xl);
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--spacing-sm);
}

.course-setup-meta {
    display: flex;
    align-items: center;
    gap: var(--spacing-2xl);
    font-size: var(--font-size-sm);
    opacity: 0.9;
}

.course-setup-meta-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

/* ============================================
   PRODUCT LIBRARY
   ============================================ */
.library-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--spacing-3xl);
    padding-bottom: var(--spacing-2xl);
    border-bottom: 2px solid var(--color-border);
}

.library-title-group {
    flex: 1;
}

.library-course-name {
    font-size: var(--font-size-sm);
    color: var(--color-text-tertiary);
    margin-bottom: var(--spacing-sm);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-weight: var(--font-weight-medium);
}

.library-title {
    font-size: var(--font-size-3xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-md);
}

.library-subtitle {
    font-size: var(--font-size-base);
    color: var(--color-text-tertiary);
}

.library-actions {
    display: flex;
    gap: var(--spacing-md);
}

/* Product Grid */
.products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: var(--spacing-2xl);
    margin-bottom: var(--spacing-4xl);
}

.product-card {
    background: white;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: var(--spacing-2xl);
    cursor: pointer;
    transition: all var(--transition-base);
    position: relative;
}

.product-card:hover {
    border-color: var(--color-primary);
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}

.product-card-header {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.product-icon {
    width: 56px;
    height: 56px;
    border-radius: var(--radius-xl);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.75rem;
    flex-shrink: 0;
}

.product-content {
    flex: 1;
    min-width: 0;
}

.product-name {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-xs);
    line-height: var(--line-height-tight);
}

.product-meta {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    font-size: var(--font-size-xs);
    color: var(--color-text-tertiary);
}

.product-meta-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.product-description {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    line-height: var(--line-height-normal);
    margin-bottom: var(--spacing-lg);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.product-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--color-border-light);
}

.product-stats {
    display: flex;
    gap: var(--spacing-lg);
    font-size: var(--font-size-xs);
    color: var(--color-text-tertiary);
}

.product-stat {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

/* Product Icon Colors */
.product-icon.mathematics {
    background: var(--color-bg-blue);
    color: var(--color-primary);
}

.product-icon.science {
    background: var(--color-bg-green);
    color: var(--color-success-dark);
}

.product-icon.english {
    background: var(--color-bg-purple);
    color: var(--color-purple);
}

.product-icon.social-studies {
    background: var(--color-bg-orange);
    color: var(--color-orange);
}


/* Course Setup Gallery Picker */
.product-gallery {
    margin-top: var(--spacing-xl);
}

.product-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--spacing-xl);
}

/* Selectable Product Cards in Course Setup */
.product-card.selectable {
    position: relative;
    cursor: pointer;
}

.product-card.selectable:hover {
    border-color: var(--color-primary);
    box-shadow: var(--shadow-lg);
}

.product-card.selected {
    border-color: var(--color-success);
    border-width: 2px;
    background: var(--color-bg-success-light, #f0fdf4);
}

.product-card.selected::after {
    content: '\f00c';
    font-family: 'Font Awesome 5 Free';
    font-weight: 900;
    position: absolute;
    top: var(--spacing-md);
    right: var(--spacing-md);
    width: 32px;
    height: 32px;
    background: var(--color-success);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-sm);
}

/* Empty State */
.empty-library {
    text-align: center;
    padding: var(--spacing-5xl) var(--spacing-3xl);
}

.empty-library-icon {
    width: 120px;
    height: 120px;
    background: var(--color-bg-secondary);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--spacing-3xl);
    font-size: 3rem;
    color: var(--color-gray-400);
}

.empty-library-title {
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-md);
}

.empty-library-text {
    font-size: var(--font-size-base);
    color: var(--color-text-tertiary);
    line-height: var(--line-height-relaxed);
    margin-bottom: var(--spacing-3xl);
    max-width: 500px;
    margin-left: auto;
    margin-right: auto;
}

/* ============================================
   PRODUCT MANAGEMENT
   ============================================ */
.product-management-header {
    background: linear-gradient(135deg, #2563eb 0%, #1e40af 100%);
    color: white;
    padding: var(--spacing-3xl);
    border-radius: var(--radius-2xl) var(--radius-2xl) 0 0;
    margin-bottom: var(--spacing-3xl);
}

.product-management-nav {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-2xl);
}

.back-button {
    background: rgba(255, 255, 255, 0.2);
    color: white;
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--radius-md);
    text-decoration: none;
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    transition: all var(--transition-base);
    border: none;
    cursor: pointer;
}

.back-button:hover {
    background: rgba(255, 255, 255, 0.3);
}

.product-management-title {
    font-size: var(--font-size-3xl);
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--spacing-sm);
}

.product-management-meta {
    display: flex;
    align-items: center;
    gap: var(--spacing-2xl);
    font-size: var(--font-size-sm);
    opacity: 0.9;
}

.product-management-meta-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.management-sections {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--spacing-2xl);
    margin-bottom: var(--spacing-3xl);
}

.management-sections-two-col {
    display: grid;
    grid-template-columns: 1.5fr 1fr;
    gap: var(--spacing-2xl);
    margin-bottom: var(--spacing-3xl);
}

@media (max-width: 1024px) {
    .management-sections-two-col {
        grid-template-columns: 1fr;
    }
}

.management-card {
    background: white;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: var(--spacing-2xl);
    transition: all var(--transition-base);
    display: flex;
    flex-direction: column;
}

.management-card-fixed-footer {
    max-height: 600px;
}

.management-card-body-scrollable {
    flex: 1;
    overflow-y: auto;
    min-height: 200px;
    max-height: 400px;
}

.management-card-footer {
    margin-top: var(--spacing-lg);
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--color-border);
}

/* Grade Sync Clean Design */
.grade-sync-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-md);
    border-bottom: 2px solid var(--color-border-light);
}

.grade-sync-title {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-primary);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin: 0;
}

.grade-sync-title i {
    color: var(--color-primary);
}

.select-all-link {
    background: none;
    border: none;
    color: var(--color-primary);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-medium);
    cursor: pointer;
    padding: var(--spacing-xs) var(--spacing-sm);
    transition: all var(--transition-base);
}

.select-all-link:hover {
    color: #1e40af;
    text-decoration: underline;
}

.grades-sync-list-clean {
    display: flex;
    flex-direction: column;
    gap: 0;
    background: #f8fafc;
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-md);
    overflow: hidden;
}

.grade-sync-item-clean {
    padding: var(--spacing-md) var(--spacing-lg);
    background: white;
    border-bottom: 1px solid #e5e7eb;
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    transition: background-color var(--transition-base);
}

.grade-sync-item-clean:last-child {
    border-bottom: none;
}

.grade-sync-item-clean:hover {
    background: #f9fafb;
}

.grade-sync-item-clean .grade-sync-checkbox {
    flex-shrink: 0;
}

.grade-sync-item-clean .grade-sync-checkbox-input {
    width: 20px;
    height: 20px;
    cursor: pointer;
    accent-color: var(--color-primary);
}

.grade-sync-item-clean .grade-sync-item-content {
    flex: 1;
    min-width: 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--spacing-md);
}

.grade-sync-item-clean .grade-sync-item-info {
    flex: 1;
    min-width: 0;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.grade-sync-item-clean .grade-sync-item-title {
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-medium);
    color: var(--color-text-primary);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    cursor: pointer;
}

.grade-sync-item-clean .grade-sync-item-details {
    display: flex;
    gap: var(--spacing-lg);
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
}

.grade-sync-item-clean .detail-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.grade-sync-item-clean .detail-item i {
    font-size: 0.875em;
    opacity: 0.7;
}

.grade-sync-item-clean .grade-sync-item-status {
    flex-shrink: 0;
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: 4px 12px;
    background: #d1fae5;
    color: #065f46;
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
}

.grade-sync-item-clean .grade-sync-item-status.synced {
    background: #d1fae5;
    color: #065f46;
}

.grade-sync-item-clean .grade-sync-item-status.pending {
    background: #fef3c7;
    color: #92400e;
}

.selection-count {
    margin-top: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
    padding: var(--spacing-md);
    background: #eff6ff;
    border: 1px solid #bfdbfe;
    border-radius: var(--radius-md);
    color: var(--color-primary);
    font-weight: var(--font-weight-semibold);
    font-size: var(--font-size-base);
}

.selection-count span {
    font-size: var(--font-size-lg);
}

.btn-light-blue {
    background: linear-gradient(135deg, #60a5fa, #3b82f6);
    color: white;
    border: none;
    font-weight: var(--font-weight-semibold);
    box-shadow: 0 2px 4px rgba(59, 130, 246, 0.3);
}

.btn-light-blue:hover {
    background: linear-gradient(135deg, #3b82f6, #2563eb);
    box-shadow: 0 4px 8px rgba(59, 130, 246, 0.4);
}

.btn-light-blue:disabled {
    background: #e5e7eb;
    color: #9ca3af;
    box-shadow: none;
    cursor: not-allowed;
}

.grades-sync-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.grade-sync-item {
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--color-background);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--spacing-md);
    transition: all var(--transition-base);
    cursor: pointer;
}

.grade-sync-item:hover {
    border-color: var(--color-primary);
    background: white;
}

.grade-sync-checkbox {
    flex-shrink: 0;
    display: flex;
    align-items: center;
}

.grade-sync-checkbox-input {
    width: 18px;
    height: 18px;
    cursor: pointer;
    accent-color: var(--color-primary);
}

.checkbox-label-hidden {
    display: none;
}

.grade-sync-item-info {
    flex: 1;
    min-width: 0; /* Allow flex item to shrink below content size */
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.grade-sync-item-title {
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-primary);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    flex: 1;
    min-width: 0;
    cursor: help; /* Show that there's more info on hover */
}

.grade-sync-item-meta {
    font-size: var(--font-size-sm);
    color: var(--color-text-tertiary);
    white-space: nowrap;
    flex-shrink: 0;
}

.grade-sync-item-status {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: var(--font-size-sm);
    padding: 4px 12px;
    border-radius: var(--radius-md);
}

.grade-sync-item-status.synced {
    background: #D1FAE5;
    color: #065F46;
}

.grade-sync-item-status.pending {
    background: #FEF3C7;
    color: #92400E;
}

.empty-state-small {
    text-align: center;
    padding: var(--spacing-3xl) var(--spacing-md);
    color: var(--color-text-tertiary);
}

.empty-state-small i {
    font-size: 2rem;
    margin-bottom: var(--spacing-md);
    opacity: 0.5;
}

.empty-state-small p {
    margin: 0;
    font-size: var(--font-size-sm);
}

.management-card-large {
    /* Larger card for combined sections */
}

.assignment-subsection {
    margin-bottom: var(--spacing-xl);
}

.assignment-subsection:last-child {
    margin-bottom: 0;
}

.subsection-title {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-md);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.subsection-title i {
    color: var(--color-primary);
}

.subsection-divider {
    height: 1px;
    background: var(--color-border);
    margin: var(--spacing-2xl) 0;
}

/* Management Tabs */
.management-tabs-container {
    background: white;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
}

.management-tabs {
    display: flex;
    border-bottom: 2px solid var(--color-border-light);
    background: linear-gradient(to bottom, #f8fafc, #f1f5f9);
}

.management-tab {
    flex: 1;
    padding: var(--spacing-lg) var(--spacing-xl);
    background: transparent;
    border: none;
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-medium);
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: all var(--transition-base);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    position: relative;
    border-right: 1px solid var(--color-border-light);
}

.management-tab:last-child {
    border-right: none;
}

.management-tab:hover {
    color: var(--color-primary);
    background: linear-gradient(to bottom, rgba(37, 99, 235, 0.05), rgba(37, 99, 235, 0.1));
}

.management-tab.active {
    color: var(--color-primary);
    background: white;
    font-weight: var(--font-weight-semibold);
}

.management-tab.active::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(to right, var(--color-primary), #3b82f6);
}

.management-tab i {
    font-size: 1.1em;
}

.tab-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 22px;
    height: 22px;
    padding: 0 6px;
    background: linear-gradient(135deg, #ef4444, #dc2626);
    color: white;
    border-radius: 11px;
    font-size: 0.75rem;
    font-weight: var(--font-weight-semibold);
    margin-left: var(--spacing-xs);
    box-shadow: 0 2px 4px rgba(239, 68, 68, 0.3);
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
        box-shadow: 0 2px 4px rgba(239, 68, 68, 0.3);
    }
    50% {
        transform: scale(1.05);
        box-shadow: 0 2px 8px rgba(239, 68, 68, 0.5);
    }
}

.management-tab-content {
    padding: var(--spacing-2xl);
}

.tab-pane {
    display: none;
}

.tab-pane.active {
    display: block;
    animation: fadeIn 0.3s ease-in-out;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.management-card:hover {
    border-color: var(--color-primary);
    box-shadow: var(--shadow-md);
}

.management-card-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.management-card-icon {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-lg);
}

.management-card-title {
    flex: 1;
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-primary);
}

.management-card-body {
    margin-bottom: var(--spacing-lg);
}

.management-card-description {
    font-size: var(--font-size-sm);
    color: var(--color-text-tertiary);
    line-height: var(--line-height-normal);
    margin-bottom: var(--spacing-lg);
}

.management-card-actions {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

/* Remove Product Section */
.remove-product-section {
    background: white;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: var(--spacing-3xl);
    text-align: center;
}

.remove-product-warning {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    background: #fef2f2;
    color: var(--color-danger-dark);
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    margin-bottom: var(--spacing-lg);
}

.remove-product-text {
    font-size: var(--font-size-sm);
    color: var(--color-text-tertiary);
    line-height: var(--line-height-normal);
    margin-bottom: var(--spacing-2xl);
}

/* ============================================
   TOAST NOTIFICATIONS
   ============================================ */
#toast {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    min-width: 320px;
    max-width: 400px;
    background: white;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    padding: var(--spacing-lg) var(--spacing-2xl);
    display: none;
    align-items: center;
    gap: var(--spacing-md);
    z-index: 10000;
    animation: slideInUp 0.3s ease;
}

@keyframes slideInUp {
    from {
        transform: translateY(100%);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

#toast.show {
    display: flex;
}

.toast-icon {
    width: 32px;
    height: 32px;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-base);
    flex-shrink: 0;
}

#toast.info .toast-icon {
    background: var(--color-bg-blue);
    color: var(--color-primary);
}

#toast.success .toast-icon {
    background: var(--color-bg-green);
    color: var(--color-success-dark);
}

#toast.error .toast-icon {
    background: #fee2e2;
    color: var(--color-danger-dark);
}

#toast.warning .toast-icon {
    background: var(--color-bg-orange);
    color: var(--color-warning-dark);
}

.toast-message {
    flex: 1;
    font-size: var(--font-size-sm);
    color: var(--color-text-primary);
    line-height: var(--line-height-normal);
}

/* ============================================
   MODALS
   ============================================ */
.modal {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    padding: var(--spacing-2xl);
}

.modal.show {
    display: flex;
}

.modal-content {
    background: white;
    border-radius: var(--radius-2xl);
    max-width: 600px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-xl);
    animation: modalSlideIn 0.3s ease;
}

@keyframes modalSlideIn {
    from {
        transform: scale(0.95) translateY(20px);
        opacity: 0;
    }
    to {
        transform: scale(1) translateY(0);
        opacity: 1;
    }
}

.modal-header {
    padding: var(--spacing-2xl) var(--spacing-3xl);
    border-bottom: 1px solid var(--color-border);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.modal-title {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-primary);
}

.modal-close {
    width: 32px;
    height: 32px;
    border-radius: var(--radius-md);
    background: transparent;
    border: none;
    color: var(--color-text-tertiary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-lg);
    transition: all var(--transition-base);
}

.modal-close:hover {
    background: var(--color-bg-secondary);
    color: var(--color-text-primary);
}

.modal-body {
    padding: var(--spacing-3xl);
}

.modal-footer {
    padding: var(--spacing-2xl) var(--spacing-3xl);
    border-top: 1px solid var(--color-border);
    display: flex;
    gap: var(--spacing-md);
    justify-content: flex-end;
}

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 1024px) {
    .products-grid {
        grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    }
    
    .management-sections {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .container,
    .header-content {
        padding: 0 var(--spacing-2xl);
    }
    
    .section {
        padding: var(--spacing-3xl) 0;
    }
    
    .section-title {
        font-size: var(--font-size-3xl);
    }
    
    .library-header {
        flex-direction: column;
        gap: var(--spacing-2xl);
    }
    
    .library-actions {
        width: 100%;
        flex-direction: column;
    }
    
    .products-grid {
        grid-template-columns: 1fr;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    #toast {
        left: var(--spacing-lg);
        right: var(--spacing-lg);
        bottom: var(--spacing-lg);
        min-width: auto;
    }
}

@media (max-width: 480px) {
    .header-nav {
        gap: var(--spacing-md);
    }
    
    .nav-link {
        padding: var(--spacing-sm);
        font-size: var(--font-size-xs);
    }
    
    .section-icon {
        width: 64px;
        height: 64px;
        font-size: 2rem;
    }
    
    .section-title {
        font-size: var(--font-size-2xl);
    }
    
    .card,
    .setup-card,
    .management-card {
        padding: var(--spacing-2xl);
    }
}

/* ============================================
   LOADING ANIMATION
   ============================================ */
.loading-spinner {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: white;
    animation: spin 0.8s linear infinite;
}

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

/* ============================================
   UTILITY OVERRIDES
   ============================================ */
.section.active {
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

/* Ensure smooth transitions */
* {
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}