/* CSS Variables */
:root {
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --secondary-color: #64748b;
    --background: #ffffff;
    --surface: #f8fafc;
    --border: #e2e8f0;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --success: #10b981;
    --error: #ef4444;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --radius: 8px;
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --transition: all 0.2s ease;
    /* Floating button spacing */
    --floating-button-width: 90px;
    --floating-button-gap: 12px;
}

/* Reset & Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Microsoft JhengHei', 'PingFang TC', 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--surface);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
    width: 100%;
    max-width: 100vw;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
    width: 100%;
    box-sizing: border-box;
}

/* Header */
.header {
    background: var(--background);
    border-bottom: 1px solid var(--border);
    padding: var(--spacing-lg) 0;
    box-shadow: var(--shadow-sm);
}

.header-content {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.header-logo-link {
    display: inline-block;
    text-decoration: none;
    transition: opacity 0.2s ease;
}

.header-logo-link:hover {
    opacity: 0.8;
}

.header-logo {
    max-width: 60px;
    max-height: 60px;
    width: auto;
    height: auto;
    object-fit: contain;
    flex-shrink: 0;
    display: block;
}

.header-title {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text-primary);
    margin: 0;
}

.header-subtitle {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

/* Main Layout */
.main {
    padding: var(--spacing-xl) 0;
    min-height: calc(100vh - 200px);
}

.layout {
    display: grid;
    grid-template-columns: 300px 1fr;
    gap: var(--spacing-xl);
    width: 100%;
    box-sizing: border-box;
}

/* Sidebar */
.sidebar {
    background: var(--background);
    border-radius: var(--radius);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-md);
    height: fit-content;
    position: sticky;
    top: var(--spacing-lg);
    max-height: calc(100vh - var(--spacing-xl) * 2);
    overflow-y: auto;
}

.sidebar-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(--border);
}

.sidebar-header h2 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
}

.sidebar-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--text-secondary);
    cursor: pointer;
    padding: var(--spacing-xs);
    line-height: 1;
}

/* Sidebar Footer Actions (Mobile Only) */
.sidebar-footer-actions {
    display: none;
}

.btn-complete {
    width: 100%;
    padding: var(--spacing-md);
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: var(--radius);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: var(--shadow-md);
}

.btn-complete:hover {
    background: var(--primary-hover);
    box-shadow: var(--shadow-lg);
}

.btn-complete:active {
    transform: translateY(1px);
}

/* Filters */
.filters {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.filter-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.filter-label {
    font-weight: 600;
    font-size: 0.875rem;
    color: var(--text-primary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* Accordion Styles */
.accordion {
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--background);
    overflow: hidden;
    transition: var(--transition);
}

.accordion:hover {
    border-color: var(--primary-color);
    box-shadow: var(--shadow-sm);
}

.accordion-header {
    width: 100%;
    display: flex;
    align-items: center;
    padding: var(--spacing-md);
    background: var(--surface);
    border: none;
    cursor: pointer;
    text-align: left;
    transition: var(--transition);
    gap: var(--spacing-sm);
    position: relative;
    flex-wrap: wrap;
}

.accordion-header:hover {
    background: var(--border);
}

.accordion-header[aria-expanded="true"] {
    background: var(--background);
    border-bottom: 1px solid var(--border);
}

.accordion-label {
    font-weight: 600;
    font-size: 0.875rem;
    color: var(--text-primary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    flex: 0 1 auto;
    order: 1;
}

.accordion-count {
    display: inline-block;
    min-width: 1.5rem;
    height: 1.5rem;
    padding: 0 0.375rem;
    background: var(--primary-color);
    color: white;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 600;
    line-height: 1.5rem;
    text-align: center;
    opacity: 0;
    transition: var(--transition);
    flex-shrink: 0;
    order: 2;
}

.accordion-count.visible {
    opacity: 1;
}

.accordion-selected {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
    flex: 1 1 auto;
    min-width: 0;
    margin-left: auto;
    order: 3;
}

.accordion-icon {
    order: 4;
    flex-shrink: 0;
}

.accordion-selected .selected-badge {
    display: inline-block;
    padding: 0.125rem 0.375rem;
    background: rgba(37, 99, 235, 0.1);
    border: 1px solid rgba(37, 99, 235, 0.2);
    border-radius: 4px;
    font-size: 0.7rem;
    color: var(--primary-color);
    white-space: nowrap;
    max-width: 100px;
    overflow: hidden;
    text-overflow: ellipsis;
}

.accordion-icon {
    font-size: 0.75rem;
    color: var(--text-secondary);
    transition: transform 0.2s ease;
    flex-shrink: 0;
    width: 1rem;
    text-align: center;
}

.accordion-header[aria-expanded="true"] .accordion-icon {
    transform: rotate(180deg);
}

.accordion-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease, padding 0.3s ease;
    padding: 0 var(--spacing-md);
}

.accordion-content.expanded {
    max-height: 500px;
    padding: var(--spacing-md);
    overflow-y: auto;
}

.accordion-content.expanded .filter-checkboxes {
    max-height: 400px;
}

.filter-checkboxes {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    max-height: 200px;
    overflow-y: auto;
    padding-right: var(--spacing-xs);
}

.filter-checkbox-wrapper {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.filter-checkbox-wrapper input[type="checkbox"] {
    width: 18px;
    height: 18px;
    cursor: pointer;
    accent-color: var(--primary-color);
}

.filter-checkbox-wrapper label {
    font-size: 0.875rem;
    color: var(--text-primary);
    cursor: pointer;
    flex: 1;
    user-select: none;
}

.filter-checkbox-wrapper:hover label {
    color: var(--primary-color);
}

/* Search Input */
.search-wrapper {
    position: relative;
}

.search-input {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    padding-right: 2rem;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    font-size: 0.875rem;
    transition: var(--transition);
}

.search-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.search-clear {
    position: absolute;
    right: var(--spacing-sm);
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    font-size: 1.25rem;
    color: var(--text-secondary);
    cursor: pointer;
    padding: var(--spacing-xs);
    line-height: 1;
    display: none;
}

.search-clear.visible {
    display: block;
}

.search-clear:hover {
    color: var(--text-primary);
}

/* Filter Actions */
.filter-actions {
    margin-top: var(--spacing-md);
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--border);
}

.btn-clear {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    color: var(--text-primary);
    font-size: 0.875rem;
    cursor: pointer;
    transition: var(--transition);
}

.btn-clear:hover {
    background: var(--border);
}

/* Content Area */
.content {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
    width: 100%;
    max-width: 100%;
    box-sizing: border-box;
    overflow-x: hidden;
}

.content-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--background);
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
}

.results-info {
    font-weight: 600;
    color: var(--text-primary);
    display: flex;
    flex-direction: column;
}

#currentSchoolInfo {
    font-weight: 400;
    font-size: 1.8rem;
    color: var(--text-secondary);
}

#currentSchoolName {
    font-weight: 600;
    color: var(--text-primary);
}

.btn-back-to-list {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: var(--radius);
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    align-self: flex-start;
}

.btn-back-to-list:hover {
    background: var(--primary-hover);
}

.btn-back-to-list .back-icon {
    font-size: 1rem;
    line-height: 1;
}

.mobile-filter-toggle {
    display: none;
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: var(--radius);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
}

.mobile-filter-toggle:hover {
    background: var(--primary-hover);
}

/* Results */
.results {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--spacing-lg);
    width: 100%;
    box-sizing: border-box;
}

/* Ad in results grid - match school card style */
.results .banner-ad {
    width: 100%;
    max-width: 100%;
    grid-column: span 1;
    padding: var(--spacing-lg);
    margin: 0;
    background: var(--background);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
    box-sizing: border-box;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 200px;
}

.results .banner-ad-link {
    width: 100%;
    max-width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-sizing: border-box;
    text-align: center;
    flex-shrink: 1;
}

/* Results page ad rules moved to line 1911 to ensure proper override */

.school-card {
    background: var(--background);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    cursor: pointer;
}

.school-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.school-name {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
    line-height: 1.4;
}

.school-info {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.school-info-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.school-badges {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
    margin-top: var(--spacing-sm);
}

.badge {
    display: inline-block;
    padding: 0.25rem 0.5rem;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 4px;
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.badge-primary {
    background: rgba(37, 99, 235, 0.1);
    border-color: rgba(37, 99, 235, 0.2);
    color: var(--primary-color);
}

/* Loading & Empty States */
.loading {
    grid-column: 1 / -1;
    text-align: center;
    padding: var(--spacing-xl);
    color: var(--text-secondary);
}

.empty-state {
    grid-column: 1 / -1;
    text-align: center;
    padding: var(--spacing-xl);
    color: var(--text-secondary);
}

.empty-state p {
    font-size: 1rem;
    margin-bottom: var(--spacing-sm);
}

.empty-state-hint {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

/* Responsive usage instructions */
.empty-state-desktop {
    display: block;
}

.empty-state-mobile {
    display: none;
}

/* Comparison Bar */
.compare-bar {
    background: var(--primary-color);
    color: white;
    padding: var(--spacing-md) 0;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow-md);
}

.compare-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--spacing-md);
}

.compare-actions {
    display: flex;
    gap: var(--spacing-sm);
}

.btn-compare,
.btn-clear-compare {
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: var(--radius);
    background: rgba(255, 255, 255, 0.2);
    color: white;
    cursor: pointer;
    font-size: 0.875rem;
    transition: background 0.2s ease;
}

.btn-compare:hover,
.btn-clear-compare:hover {
    background: rgba(255, 255, 255, 0.3);
}

/* Comparison Checkbox on Cards */
.school-card-header {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
}

.compare-checkbox-wrapper {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    cursor: pointer;
    flex-shrink: 0;
    padding: var(--spacing-xs);
    margin: calc(var(--spacing-xs) * -1);
}

.compare-checkbox-wrapper input[type="checkbox"] {
    cursor: pointer;
    width: 18px;
    height: 18px;
    margin: 0;
}

.compare-checkbox-wrapper input[type="checkbox"]:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.compare-checkbox-label {
    font-size: 0.75rem;
    color: var(--text-secondary);
    user-select: none;
}

.school-name {
    flex: 1;
    margin: 0;
}

/* Detail Compare Button */
.btn-compare-detail {
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: var(--radius);
    cursor: pointer;
    font-size: 0.875rem;
    transition: background 0.2s ease;
    white-space: nowrap;
}

.btn-compare-detail:hover:not(.disabled) {
    background: var(--primary-hover);
}

.btn-compare-detail.in-compare {
    background: var(--success-color, #10b981);
}

.btn-compare-detail.disabled {
    background: var(--text-secondary);
    cursor: not-allowed;
    opacity: 0.6;
}

/* Comparison View */
.compare-view {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.compare-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding-bottom: var(--spacing-md);
    border-bottom: 2px solid var(--border);
}

.compare-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin: 0;
}

.compare-content {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.compare-accordion {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
}

.compare-accordion-header {
    width: 100%;
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--surface);
    border: none;
    text-align: left;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    transition: background 0.2s ease;
}

.compare-accordion-header:hover {
    background: var(--background);
}

.compare-accordion-icon {
    transition: transform 0.2s ease;
    font-size: 0.875rem;
}

.compare-accordion-header[aria-expanded="true"] .compare-accordion-icon {
    transform: rotate(180deg);
}

.compare-accordion-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

.compare-accordion-content.expanded {
    max-height: 5000px;
}

.compare-table {
    width: 100%;
    border-collapse: collapse;
}

.compare-table thead {
    position: sticky;
    top: 0;
    z-index: 10;
    background: var(--background);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.compare-header-row {
    background: var(--background);
}

.compare-header-row th {
    padding: var(--spacing-md);
    text-align: left;
    font-weight: 600;
    color: var(--text-primary);
    border-bottom: 2px solid var(--border);
    background: var(--background);
}

.compare-field-label {
    width: 200px;
    min-width: 200px;
    padding: var(--spacing-sm) var(--spacing-md);
    font-weight: 500;
    color: var(--text-primary);
    background: var(--background);
    border-right: 1px solid var(--border);
    vertical-align: top;
    position: sticky;
    left: 0;
    z-index: 5;
    box-shadow: 2px 0 4px rgba(0, 0, 0, 0.05);
}

.compare-school-name {
    padding: var(--spacing-sm) var(--spacing-md);
    font-weight: 600;
    color: var(--primary-color);
    border-bottom: 1px solid var(--border);
    position: relative;
}

/* School color themes */
.compare-school-col-1 {
    border-left: 4px solid #2563eb;
    background: rgba(37, 99, 235, 0.05);
}

.compare-school-col-2 {
    border-left: 4px solid #10b981;
    background: rgba(16, 185, 129, 0.05);
}

.compare-school-col-3 {
    border-left: 4px solid #f59e0b;
    background: rgba(245, 158, 11, 0.05);
}

.compare-school-name.compare-school-col-1 {
    color: #2563eb;
    border-left: none;
    border-top: 3px solid #2563eb;
}

.compare-school-name.compare-school-col-2 {
    color: #10b981;
    border-left: none;
    border-top: 3px solid #10b981;
}

.compare-school-name.compare-school-col-3 {
    color: #f59e0b;
    border-left: none;
    border-top: 3px solid #f59e0b;
}

/* Grade header row for class table */
.compare-grade-header-row {
    background: var(--surface);
}

.compare-grade-header-row th {
    padding: var(--spacing-xs) var(--spacing-md);
    text-align: center;
    font-weight: 500;
    font-size: 0.875rem;
    color: var(--text-secondary);
    border-bottom: 1px solid var(--border);
    background: var(--surface);
}

.compare-grade-label {
    font-size: 0.875rem;
    font-weight: 500;
}

/* Responsive design for comparison tables */
@media (max-width: 768px) {
    .compare-table {
        display: block;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }
    
    .compare-table thead {
        position: sticky;
        top: 0;
        left: 0;
    }
    
    .compare-field-label {
        position: sticky;
        left: 0;
        z-index: 6;
        min-width: 120px;
        width: 120px;
        font-size: 0.875rem;
        padding: var(--spacing-xs) var(--spacing-sm);
    }
    
    .compare-school-name,
    .compare-field-value {
        min-width: 120px;
        padding: var(--spacing-xs) var(--spacing-sm);
        font-size: 0.875rem;
    }
    
    .compare-school-name {
        font-size: 0.8rem;
    }
    
    .compare-grade-label {
        font-size: 0.75rem;
        padding: var(--spacing-xs);
    }
}

@media (max-width: 480px) {
    .compare-field-label {
        min-width: 100px;
        width: 100px;
        font-size: 0.8rem;
    }
    
    .compare-school-name,
    .compare-field-value {
        min-width: 100px;
        font-size: 0.8rem;
    }
}

.compare-field-row {
    border-bottom: 1px solid var(--border);
    transition: background-color 0.2s ease;
}

.compare-field-row:hover {
    background: var(--background);
}

.compare-field-row:hover .compare-field-label {
    background: var(--surface);
    font-weight: 600;
}

.compare-field-value {
    padding: var(--spacing-sm) var(--spacing-md);
    color: var(--text-primary);
    vertical-align: top;
    min-width: 150px;
}

.compare-field-value:hover {
    background: rgba(0, 0, 0, 0.02);
}

.compare-field-value .empty {
    color: var(--text-secondary);
    font-style: italic;
}

/* Visual enhancements for important information */
/* Note: Using class-based approach instead of :has() for better browser compatibility */
.compare-field-value strong,
.compare-field-value[data-important="true"] {
    font-weight: 600;
    color: var(--text-primary);
}

/* Add subtle separator between school columns on desktop */
@media (min-width: 769px) {
    .compare-school-col-2,
    .compare-school-col-3 {
        border-left: 1px solid rgba(0, 0, 0, 0.05);
    }
}

/* Enhanced hover effects */
.compare-field-row:hover .compare-field-value.compare-school-col-1 {
    background: rgba(37, 99, 235, 0.08);
}

.compare-field-row:hover .compare-field-value.compare-school-col-2 {
    background: rgba(16, 185, 129, 0.08);
}

.compare-field-row:hover .compare-field-value.compare-school-col-3 {
    background: rgba(245, 158, 11, 0.08);
    font-style: italic;
}

/* School Detail View */
.school-detail {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
    margin-top: var(--spacing-md);
}

.detail-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--background);
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
    margin-bottom: var(--spacing-md);
    gap: var(--spacing-md);
}

.detail-title {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text-primary);
    margin: 0;
    flex: 1;
}

.btn-back {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    color: var(--text-primary);
    font-size: 0.875rem;
    cursor: pointer;
    transition: var(--transition);
    flex-shrink: 0;
}

.btn-back:hover {
    background: var(--border);
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.back-icon {
    font-size: 1.2rem;
    line-height: 1;
}

.detail-content {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

/* Detail Accordion Sections */
.detail-accordion {
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--background);
    overflow: hidden;
}

.detail-accordion-header {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--surface);
    border: none;
    cursor: pointer;
    text-align: left;
    transition: var(--transition);
}

.detail-accordion-header:hover {
    background: var(--border);
}

.detail-accordion-header[aria-expanded="true"] {
    background: var(--background);
    border-bottom: 1px solid var(--border);
}

.detail-accordion-label {
    font-weight: 600;
    font-size: 1rem;
    color: var(--text-primary);
}

.detail-accordion-icon {
    font-size: 0.75rem;
    color: var(--text-secondary);
    transition: transform 0.2s ease;
}

.detail-accordion-header[aria-expanded="true"] .detail-accordion-icon {
    transform: rotate(180deg);
}

.detail-accordion-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease, padding 0.3s ease;
    padding: 0 var(--spacing-lg);
}

.detail-accordion-content.expanded {
    max-height: 2000px;
    padding: var(--spacing-lg);
}

/* Field Rows */
.field-row {
    display: grid;
    grid-template-columns: 200px 1fr;
    gap: var(--spacing-md);
    padding: var(--spacing-sm) 0;
    border-bottom: 1px solid var(--border);
}

.field-row:last-child {
    border-bottom: none;
}

.field-label {
    font-weight: 600;
    font-size: 0.875rem;
    color: var(--text-primary);
}

.field-value {
    font-size: 0.875rem;
    color: var(--text-secondary);
    line-height: 1.6;
    word-break: break-word;
}

.field-value.empty {
    color: var(--text-secondary);
    font-style: italic;
}

.field-value-truncated {
    display: inline;
}

.read-more-toggle {
    color: var(--primary-color);
    cursor: pointer;
    text-decoration: underline;
    font-weight: 600;
    margin-left: 0.25rem;
    user-select: none;
    white-space: nowrap;
}

.read-more-toggle:hover {
    color: var(--primary-hover);
    text-decoration: underline;
}

.field-value a {
    color: var(--primary-color);
    text-decoration: none;
}

.field-value a:hover {
    text-decoration: underline;
}

/* Teacher Statistics Charts */
.teacher-charts-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    padding: var(--spacing-md);
    background: var(--surface);
    border-radius: var(--radius);
    border: 1px solid var(--border);
}

.chart-wrapper {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: var(--spacing-md);
    background: var(--background);
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
}

.chart-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0 0 var(--spacing-md) 0;
    text-align: center;
}

.chart-placeholder {
    padding: var(--spacing-lg);
    color: var(--text-secondary);
    font-style: italic;
    text-align: center;
}

.pie-chart-container {
    display: flex;
    justify-content: center;
    align-items: center;
    margin-bottom: var(--spacing-md);
}

.pie-chart {
    max-width: 100%;
    height: auto;
}

.bar-chart-container {
    display: flex;
    justify-content: center;
    align-items: center;
    margin-bottom: var(--spacing-md);
}

.bar-chart {
    max-width: 100%;
    height: auto;
}

.chart-bar {
    transition: opacity 0.2s ease;
    cursor: pointer;
}

.chart-bar:hover {
    opacity: 0.8;
}

.chart-value {
    pointer-events: none;
    user-select: none;
}

.chart-segment {
    transition: opacity 0.2s ease;
    cursor: pointer;
}

.chart-segment:hover {
    opacity: 0.8;
}

.chart-label {
    pointer-events: none;
    user-select: none;
}

.chart-legend {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
    width: 100%;
    margin-top: var(--spacing-sm);
}

.legend-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 0.875rem;
    color: var(--text-primary);
}

.legend-color {
    width: 16px;
    height: 16px;
    border-radius: 4px;
    flex-shrink: 0;
    border: 1px solid rgba(0, 0, 0, 0.1);
}

.legend-label {
    flex: 1;
    color: var(--text-primary);
}

.legend-value {
    font-weight: 600;
    color: var(--text-secondary);
}

/* Class Information Table */
.class-table-wrapper {
    margin-bottom: var(--spacing-lg);
    overflow-x: auto;
}

.class-table {
    width: 100%;
    border-collapse: collapse;
    background: var(--background);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.class-table thead {
    background: var(--surface);
}

.class-table th {
    padding: var(--spacing-md);
    text-align: left;
    font-weight: 600;
    font-size: 0.875rem;
    color: var(--text-primary);
    border-bottom: 2px solid var(--border);
}

.class-table td {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 0.875rem;
    color: var(--text-secondary);
    border-bottom: 1px solid var(--border);
}

.class-table tbody tr:last-child td {
    border-bottom: none;
}

.class-table tbody tr:hover {
    background: var(--surface);
}

.class-grade {
    font-weight: 500;
    color: var(--text-primary);
}

.class-value {
    text-align: center;
}

/* Assessment Table */
.assessment-table-wrapper {
    margin-bottom: var(--spacing-lg);
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

.assessment-table {
    width: 100%;
    border-collapse: collapse;
    background: var(--background);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.assessment-table thead {
    background: var(--surface);
}

.assessment-table th {
    padding: var(--spacing-md);
    text-align: left;
    font-weight: 600;
    font-size: 0.875rem;
    color: var(--text-primary);
    border-bottom: 2px solid var(--border);
}

.assessment-table td {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 0.875rem;
    color: var(--text-secondary);
    border-bottom: 1px solid var(--border);
}

.assessment-table tbody tr:last-child td {
    border-bottom: none;
}

.assessment-table tbody tr:hover {
    background: var(--surface);
}

.assessment-grade {
    font-weight: 500;
    color: var(--text-primary);
}

.assessment-value {
    text-align: center;
}

@media (max-width: 768px) {
    .assessment-table-wrapper {
        overflow-x: scroll;
    }
}

/* Number Cards */
.number-cards-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    width: 100%;
}

.number-card {
    background: var(--background);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-sm);
    text-align: center;
    transition: var(--transition);
}

.number-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.number-card-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
    font-weight: 500;
}

.number-card-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-color);
    line-height: 1.2;
}

.number-card-value .empty {
    color: var(--text-secondary);
    font-size: 1rem;
    font-weight: 400;
}

/* Responsive Charts */
@media (max-width: 768px) {
    .teacher-charts-container {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
        padding: var(--spacing-sm);
    }
    
    .chart-wrapper {
        padding: var(--spacing-sm);
    }
    
    .chart-title {
        font-size: 0.9375rem;
    }
    
    .pie-chart {
        width: 180px;
        height: 180px;
    }
    
    .legend-item {
        font-size: 0.8125rem;
    }
}

/* Articles Carousel */
.articles-carousel-container {
    margin-bottom: var(--spacing-xl);
    background: var(--background);
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
}

.carousel-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md) var(--spacing-lg);
    border-bottom: 1px solid var(--border);
    background: var(--surface);
}

.carousel-title {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.carousel-icon {
    font-size: 1.25rem;
}

.carousel-title h3 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
}

.carousel-controls {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.carousel-counter {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-right: var(--spacing-sm);
}

.carousel-nav {
    background: var(--background);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
    color: var(--text-primary);
    font-size: 1.5rem;
    line-height: 1;
    padding: 0;
}

.carousel-nav:hover:not(:disabled) {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.carousel-nav:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.carousel-viewport {
    position: relative;
    width: 100%;
    overflow: hidden;
    background: var(--background);
}

.carousel-track {
    display: flex;
    transition: transform 0.3s ease;
    will-change: transform;
}

.carousel-slide {
    flex: 0 0 100%;
    min-width: 0;
    display: flex;
    flex-direction: column;
}

.carousel-slide a {
    display: block;
    text-decoration: none;
    color: inherit;
}

.article-image-container {
    width: 100%;
    position: relative;
    background: var(--surface);
    overflow: hidden;
}

.article-image-container img {
    width: 100%;
    height: auto;
    display: block;
    aspect-ratio: 16 / 9;
    object-fit: cover;
}

.article-image-placeholder {
    width: 100%;
    aspect-ratio: 16 / 9;
    background: var(--surface);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
}

.article-image-placeholder.loading {
    background: linear-gradient(90deg, var(--surface) 0%, var(--border) 50%, var(--surface) 100%);
    background-size: 200% 100%;
    animation: loading-shimmer 1.5s infinite;
}

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

.article-image-placeholder svg {
    width: 64px;
    height: 64px;
    opacity: 0.3;
}

.article-title {
    padding: var(--spacing-md) var(--spacing-lg);
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--text-primary);
    line-height: 1.5;
    background: var(--background);
}

.carousel-indicators {
    display: flex;
    justify-content: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-md);
    background: var(--surface);
    border-top: 1px solid var(--border);
}

.carousel-indicator {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--border);
    border: none;
    cursor: pointer;
    transition: var(--transition);
    padding: 0;
}

.carousel-indicator:hover {
    background: var(--text-secondary);
}

.carousel-indicator.active {
    background: var(--primary-color);
    width: 24px;
    border-radius: 4px;
}

/* Responsive Carousel */
@media (max-width: 768px) {
    .carousel-header {
        flex-wrap: wrap;
        gap: var(--spacing-sm);
    }
    
    .carousel-controls {
        width: 100%;
        justify-content: space-between;
    }
    
    .carousel-title h3 {
        font-size: 0.9375rem;
    }
    
    .article-title {
        font-size: 0.875rem;
        padding: var(--spacing-sm) var(--spacing-md);
    }
}

/* Footer */
.footer {
    background: var(--background);
    border-top: 1px solid var(--border);
    padding: var(--spacing-lg) 0;
    margin-top: var(--spacing-xl);
}

.footer p {
    text-align: center;
    font-size: 0.75rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

.footer a {
    color: var(--text-secondary);
    text-decoration: underline;
    transition: opacity 0.2s ease;
}

.footer a:hover {
    opacity: 0.8;
}

/* Responsive Design */
@media (max-width: 1024px) {
    .layout {
        grid-template-columns: 280px 1fr;
        gap: var(--spacing-lg);
    }
    
    .results {
        grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    }
}

@media (max-width: 768px) {
    .container {
        padding: 0 var(--spacing-sm);
    }
    
    .layout {
        grid-template-columns: 1fr;
        gap: 0;
        display: grid;
    }
    
    .content {
        width: 100%;
        max-width: 100%;
        grid-column: 1;
        grid-row: 1;
        margin: 0;
        padding: 0;
    }
    
    .sidebar {
        position: fixed;
        top: 0;
        left: -100%;
        width: 85%;
        max-width: 320px;
        height: 100vh;
        z-index: 1000;
        transition: left 0.3s ease;
        box-shadow: var(--shadow-lg);
        max-height: 100vh;
        display: flex;
        flex-direction: column;
        overflow: hidden;
        padding: 0;
        box-sizing: border-box;
        grid-column: unset;
        grid-row: unset;
    }
    
    .sidebar.open {
        left: 0;
    }
    
    /* Sidebar overlay */
    .sidebar-overlay {
        display: none;
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background: rgba(0, 0, 0, 0.5);
        z-index: 999;
        opacity: 0;
        transition: opacity 0.3s ease;
    }
    
    .sidebar-overlay.active {
        display: block;
        opacity: 1;
    }
    
    .sidebar-toggle {
        display: block;
    }
    
    .mobile-filter-toggle {
        display: block;
    }
    
    /* Sidebar header - fixed at top */
    .sidebar .sidebar-header {
        flex-shrink: 0;
        padding: var(--spacing-lg);
        padding-bottom: var(--spacing-md);
        margin-bottom: var(--spacing-lg);
        border-bottom: 2px solid var(--border);
    }
    
    /* Ensure filters container can scroll independently */
    .sidebar .filters {
        flex: 1 1 0;
        overflow-y: auto;
        overflow-x: hidden;
        min-height: 0;
        padding: 0 var(--spacing-lg);
        padding-top: var(--spacing-lg);
        display: flex;
        flex-direction: column;
        gap: var(--spacing-lg);
        -webkit-overflow-scrolling: touch;
    }
    
    /* Ensure accordions are not compressed */
    .sidebar .accordion {
        flex-shrink: 0;
        min-height: auto;
        width: 100%;
    }
    
    /* Sidebar Footer Actions - Fixed at bottom on mobile */
    .sidebar-footer-actions {
        display: flex;
        flex-direction: column;
        flex-shrink: 0;
        padding: var(--spacing-md) var(--spacing-lg);
        padding-bottom: var(--spacing-lg);
        margin-top: var(--spacing-md);
        background: var(--background);
        border-top: 1px solid var(--border);
        box-shadow: 0 -2px 8px rgba(0, 0, 0, 0.1);
        z-index: 10;
    }
    
    .empty-state-desktop {
        display: none;
    }
    
    .empty-state-mobile {
        display: block;
    }
    
    .results {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
    
    .content-header {
        flex-wrap: wrap;
        gap: var(--spacing-sm);
    }

    .school-detail {
        width: 100%;
        max-width: 100%;
        margin: var(--spacing-sm) 0 0 0;
        padding: 0;
        box-sizing: border-box;
    }
    
    .detail-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-md);
        padding: var(--spacing-md);
        margin-bottom: var(--spacing-md);
        width: 100%;
        box-sizing: border-box;
    }
    
    .detail-title {
        font-size: 1.5rem;
        margin: 0;
        width: 100%;
    }
    
    .btn-back {
        width: 100%;
        align-self: stretch;
        padding: var(--spacing-md);
        justify-content: center;
    }

    .field-row {
        grid-template-columns: 1fr;
        gap: var(--spacing-xs);
    }

    .field-label {
        font-size: 0.8rem;
    }
    
    /* Fix ad images on mobile */
    .results .banner-ad {
        padding: var(--spacing-md);
        min-height: 150px;
    }
    
    .results .banner-ad img {
        max-width: 100% !important;
        width: auto !important;
        height: auto !important;
        object-fit: contain !important;
        display: block !important;
    }
    
    /* Ensure content doesn't overflow */
    .content {
        width: 100%;
        max-width: 100%;
        overflow-x: hidden;
    }
    
    .school-card {
        width: 100%;
        max-width: 100%;
        box-sizing: border-box;
    }
}

@media (max-width: 480px) {
    .header-logo {
        max-width: 48px;
        max-height: 48px;
    }
    
    .header-title {
        font-size: 1.25rem;
    }
    
    .container {
        padding: 0 var(--spacing-xs);
    }
    
    .main {
        padding: var(--spacing-md) 0;
    }
    
    .results {
        gap: var(--spacing-sm);
    }
    
    .school-card {
        padding: var(--spacing-md);
    }
    
    .school-name {
        font-size: 1rem;
    }
    
    .school-info-item {
        font-size: 0.875rem;
    }
    
    /* Optimize ad display on very small screens */
    .results .banner-ad {
        padding: var(--spacing-sm);
        min-height: 120px;
    }
}

/* Scrollbar Styling */
.filter-checkboxes::-webkit-scrollbar {
    width: 6px;
}

.filter-checkboxes::-webkit-scrollbar-track {
    background: var(--surface);
    border-radius: 3px;
}

.filter-checkboxes::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 3px;
}

.filter-checkboxes::-webkit-scrollbar-thumb:hover {
    background: var(--text-secondary);
}

.sidebar::-webkit-scrollbar {
    width: 8px;
}

.sidebar::-webkit-scrollbar-track {
    background: transparent;
}

.sidebar::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 4px;
}

.sidebar::-webkit-scrollbar-thumb:hover {
    background: var(--text-secondary);
}

/* Keyword Categories Container */
.keyword-categories-container {
    margin-top: var(--spacing-md);
}

/* Keyword Category Accordion */
.keyword-category-accordion {
    margin-bottom: var(--spacing-sm);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
}

.keyword-category-header {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--surface);
    border: none;
    text-align: left;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: space-between;
    transition: background-color var(--transition);
}

.keyword-category-header:hover {
    background: var(--border);
}

.keyword-category-name {
    font-weight: 600;
    color: var(--text-primary);
}

.keyword-category-count {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-left: auto;
    margin-right: var(--spacing-sm);
}

.keyword-category-icon {
    font-size: 0.75rem;
    color: var(--text-secondary);
    transition: transform var(--transition);
}

.keyword-category-content {
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--background);
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

/* Keyword Checkbox Wrapper */
.keyword-checkbox-wrapper {
    display: flex;
    align-items: center;
    padding: var(--spacing-xs) 0;
    gap: var(--spacing-xs);
}

.keyword-checkbox {
    width: 18px;
    height: 18px;
    cursor: pointer;
    accent-color: var(--primary-color);
    flex-shrink: 0;
}

.keyword-checkbox-label {
    font-size: 0.875rem;
    color: var(--text-primary);
    cursor: pointer;
    user-select: none;
    line-height: 1.4;
}

.keyword-checkbox-label:hover {
    color: var(--primary-color);
}

/* Banner Ad Styles */
.banner-ad {
    margin: var(--spacing-lg) 0;
    padding: var(--spacing-md);
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    text-align: center;
    position: relative;
    width: 100%;
    max-width: 100%;
    overflow: visible;
    box-sizing: border-box;
}

.banner-ad-label {
    position: absolute;
    top: 4px;
    right: 8px;
    font-size: 0.75rem;
    color: var(--text-secondary);
    background: var(--background);
    padding: 2px 6px;
    border-radius: 4px;
}

/* Ad Placeholder Styles */
.banner-ad-placeholder {
    background: #2d2d2d;
    border: 2px solid #1a1a1a;
    min-height: 250px;
    aspect-ratio: 970 / 250;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Responsive placeholder height for small screens */
@media (max-width: 970px) {
    .banner-ad-placeholder {
        min-height: auto;
        height: auto;
        padding-bottom: calc(250 / 970 * 100%);
    }
}

.banner-ad-placeholder-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    width: 100%;
    height: 100%;
    min-height: inherit;
}

.banner-ad-placeholder-text {
    color: #999;
    font-size: 0.875rem;
    font-weight: 500;
    margin-top: 4px;
}

.banner-ad-placeholder .banner-ad-label {
    color: #999;
    background: #2d2d2d;
    border: 1px solid #1a1a1a;
}

.banner-ad-link {
    display: block;
    width: 100%;
    max-width: 970px;
    margin: 0 auto;
    text-decoration: none;
    transition: opacity 0.2s ease;
    overflow: visible;
}

.banner-ad-link:hover {
    opacity: 0.9;
}

/* Unified ad size - 970x250 with responsive scaling */
/* General banner ad rule - EXCLUDES results page ads */
.banner-ad img {
    width: 100%;
    max-width: 970px;
    height: auto;
    display: block;
    margin: 0 auto;
    border-radius: 4px;
    object-fit: contain;
}

/* Detail page ad - full width up to 970px */
.detail-content .banner-ad img {
    max-width: 970px;
}

/* Results page ad - match card width, centered and scaled */
/* MUST come after general rule and use !important to ensure override */
.results .banner-ad img {
    width: auto !important;
    max-width: 100% !important;
    height: auto !important;
    object-fit: contain !important;
    display: block !important;
    margin: 0 auto !important;
    flex-shrink: 1 !important;
}

/* Maintain aspect ratio on smaller screens - only for detail page */
@media (max-width: 970px) {
    .detail-content .banner-ad img {
        aspect-ratio: 970 / 250;
    }
}
/* Articles List (Card Grid) - V2.0 Upgrade */
.articles-list-container {
    margin-bottom: var(--spacing-xl);
    background: var(--background);
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
}

.articles-header {
    padding: var(--spacing-md) var(--spacing-lg);
    border-bottom: 1px solid var(--border);
    background: var(--surface);
}

.articles-header h3 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
}

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

.article-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    transition: var(--transition);
    display: flex;
    flex-direction: column;
}

.article-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.article-card-link {
    display: flex;
    flex-direction: column;
    text-decoration: none;
    color: inherit;
    height: 100%;
}

.article-card-image-container {
    width: 100%;
    position: relative;
    background: var(--surface);
    overflow: hidden;
    aspect-ratio: 16 / 9;
}

.article-card-image-container img {
    width: 100%;
    height: 100%;
    display: block;
    object-fit: cover;
}

.article-card-image-placeholder {
    width: 100%;
    height: 100%;
    background: var(--surface);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
}

.article-card-image-placeholder.loading {
    background: linear-gradient(90deg, var(--surface) 0%, var(--border) 50%, var(--surface) 100%);
    background-size: 200% 100%;
    animation: loading-shimmer 1.5s infinite;
}

.article-card-image-placeholder svg {
    width: 48px;
    height: 48px;
    opacity: 0.3;
}

.article-card-title {
    padding: var(--spacing-md);
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--text-primary);
    line-height: 1.5;
    flex: 1;
}

@media (max-width: 768px) {
    .articles-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-sm);
        padding: var(--spacing-sm);
    }
}

/* Floating Buttons - V2.0 Upgrade */
.floating-button {
    position: fixed;
    bottom: var(--spacing-lg);
    right: var(--spacing-lg);
    z-index: 1000;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 50px;
    padding: var(--spacing-md) var(--spacing-lg);
    font-size: 0.875rem;
    font-weight: 600;
    cursor: pointer;
    box-shadow: var(--shadow-lg);
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

/* Adjust filters button - keep original position (rightmost) */
#floatingButton {
    right: var(--spacing-lg);
}

/* Back to list button - positioned to the left of adjust filters */
#backToListButton {
    right: calc(var(--spacing-lg) + var(--floating-button-width) + var(--floating-button-gap));
}

/* Share button - positioned to the left of back to list button */
#floatingShareButton {
    position: fixed;
    bottom: var(--spacing-lg);
    right: calc(var(--spacing-lg) + var(--floating-button-width) + var(--floating-button-gap) + var(--floating-button-width) + var(--floating-button-gap));
    z-index: 1000;
}

/* Share button's floating button should not have fixed positioning */
#floatingShareButton .floating-button {
    position: relative;
    bottom: auto;
    right: auto;
}

.floating-button:hover {
    background: var(--primary-hover);
    box-shadow: 0 12px 24px -4px rgba(0, 0, 0, 0.2);
    transform: translateY(-2px);
}

.share-dropdown {
    position: absolute;
    bottom: calc(100% + var(--spacing-sm));
    right: 0;
    background: white;
    border-radius: var(--radius);
    box-shadow: var(--shadow-lg);
    padding: var(--spacing-xs);
    min-width: 150px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: var(--transition);
    z-index: 1001;
    pointer-events: none;
}

.share-dropdown.active {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
    pointer-events: auto;
}

.share-option {
    display: block;
    padding: var(--spacing-sm) var(--spacing-md);
    color: var(--text-primary);
    text-decoration: none;
    border: none;
    background: none;
    width: 100%;
    text-align: left;
    cursor: pointer;
    border-radius: var(--radius);
    transition: var(--transition);
    font-size: 0.875rem;
}

.share-option:hover {
    background: var(--background);
}

@media (max-width: 768px) {
    .floating-button {
        bottom: var(--spacing-md);
        right: var(--spacing-md);
        padding: var(--spacing-sm) var(--spacing-md);
        font-size: 0.8125rem;
    }
    
    /* Adjust floating button positions on mobile - use same spacing logic */
    #floatingButton {
        right: var(--spacing-md);
    }
    
    #backToListButton {
        right: calc(var(--spacing-md) + var(--floating-button-width) + var(--floating-button-gap));
    }
    
    #floatingShareButton {
        bottom: var(--spacing-md);
        right: calc(var(--spacing-md) + var(--floating-button-width) + var(--floating-button-gap) + var(--floating-button-width) + var(--floating-button-gap));
    }
    
    .share-dropdown {
        min-width: 120px;
    }
    
    .share-option {
        font-size: 0.8125rem;
        padding: var(--spacing-xs) var(--spacing-sm);
    }
}

/* Search View (Two-Stage Design) - V2.0 */
/* Search View */
.search-view {
    background: var(--background);
    border-radius: var(--radius);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-md);
    max-width: 900px;
    margin: 0 auto;
}

.search-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(--border);
}

.search-header h2 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
}

.search-preview {
    font-size: 0.875rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.search-preview span {
    color: var(--primary-color);
    font-weight: 700;
    font-size: 1.125rem;
}

/* Search Actions */
.search-actions {
    margin-top: var(--spacing-lg);
    padding-top: var(--spacing-md);
    border-top: 2px solid var(--border);
}

.btn-search {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-lg);
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: var(--radius);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: var(--shadow-md);
}

.btn-search:hover {
    background: var(--primary-hover);
    box-shadow: var(--shadow-lg);
    transform: translateY(-1px);
}

.btn-search:active {
    transform: translateY(0);
}

/* Results View */
.results-view {
    width: 100%;
}

.results-header {
    margin-bottom: var(--spacing-md);
}

.filter-summary {
    margin-top: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--surface);
    border-radius: var(--radius);
    border: 1px solid var(--border);
}

.filter-summary-title {
    font-weight: 600;
    font-size: 0.875rem;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.filter-summary-items {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.filter-summary-badge {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-sm);
    background: rgba(37, 99, 235, 0.1);
    border: 1px solid rgba(37, 99, 235, 0.2);
    border-radius: 4px;
    font-size: 0.875rem;
    color: var(--primary-color);
}

@media (max-width: 768px) {
    .search-view {
        padding: var(--spacing-md);
    }
    
    .search-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-sm);
    }
    
    .search-header h2 {
        font-size: 1.125rem;
    }
    
    .search-preview {
        font-size: 0.8125rem;
    }
    
    .search-preview span {
        font-size: 1rem;
    }
    
    .btn-search {
        width: 100%;
        padding: var(--spacing-md);
    }
}