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

:root {
    --primary-black: #000000;
    --primary-white: #ffffff;
    --gray-50: #fafafa;
    --gray-100: #f5f5f5;
    --gray-200: #e5e5e5;
    --gray-300: #d4d4d4;
    --gray-400: #a3a3a3;
    --gray-500: #737373;
    --gray-600: #525252;
    --gray-700: #404040;
    --gray-800: #262626;
    --gray-900: #171717;
    --accent-blue: #3b82f6;
    --accent-green: #10b981;
    --accent-yellow: #f59e0b;
    --accent-red: #ef4444;
    --accent-purple: #8b5cf6;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --border-radius: 12px;
    --border-radius-lg: 16px;
    --border-radius-xl: 20px;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--gray-50);
    color: var(--primary-black);
    line-height: 1.6;
    overflow-x: hidden;
}

/* Loading Screen */
.listings-loader {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--primary-white);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 9999;
    transition: opacity 0.5s ease, visibility 0.5s ease;
}

.listings-loader.hidden {
    opacity: 0;
    visibility: hidden;
}

.loader-content {
    text-align: center;
    max-width: 400px;
    padding: 2rem;
}

.loader-animation {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 2rem;
}

.search-icon {
    width: 60px;
    height: 60px;
    background: var(--primary-black);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary-white);
    font-size: 1.5rem;
    animation: searchPulse 2s ease-in-out infinite;
}

@keyframes searchPulse {

    0%,
    100% {
        transform: scale(1);
        box-shadow: 0 0 0 0 rgba(0, 0, 0, 0.7);
    }

    50% {
        transform: scale(1.1);
        box-shadow: 0 0 0 10px rgba(0, 0, 0, 0);
    }
}

.loader-text h2 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-black);
    margin-bottom: 0.5rem;
}

.loader-text p {
    color: var(--gray-600);
    font-size: 0.9rem;
}

.progress-bar {
    width: 100%;
    height: 4px;
    background: var(--gray-200);
    border-radius: 2px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: var(--primary-black);
    width: 0%;
    animation: loadProgress 3s ease-in-out;
}

@keyframes loadProgress {
    0% {
        width: 0%;
    }

    100% {
        width: 100%;
    }
}

/* Mobile Menu */
.mobile-menu-btn {
    position: fixed;
    top: 1rem;
    left: 1rem;
    z-index: 2001;
    display: none;
    width: 48px;
    height: 48px;
    background: var(--primary-white);
    border: none;
    border-radius: 50%;
    box-shadow: var(--shadow-lg);
    cursor: pointer;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 4px;
}

.menu-bar {
    width: 18px;
    height: 2px;
    background: var(--primary-black);
    border-radius: 1px;
    transition: var(--transition);
}

/* Dashboard Container */
.dashboard-container {
    display: flex;
    min-height: 100vh;
    position: relative;
}

/* Sidebar */
.sidebar {
    width: 280px;
    background: var(--primary-white);
    border-right: 1px solid var(--gray-200);
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 0;
    left: 0;
    height: 100vh;
    z-index: 2000;
    transition: var(--transition);
    box-shadow: var(--shadow-lg);
    overflow-y: auto;
}

.sidebar-header {
    padding: 1.5rem;
    border-bottom: 1px solid var(--gray-200);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.logo-icon {
    width: 40px;
    height: 40px;
    background: var(--primary-black);
    color: var(--primary-white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
}

.logo-text {
    font-size: 1.5rem;
    font-weight: 900;
    color: var(--primary-black);
    font-family: 'JetBrains Mono', monospace;
}

.sidebar-close {
    width: 32px;
    height: 32px;
    background: none;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    display: none;
    align-items: center;
    justify-content: center;
    color: var(--gray-500);
    transition: var(--transition);
}

/* User Profile in Sidebar */
.sidebar-user {
    padding: 1.5rem;
    border-bottom: 1px solid var(--gray-200);
    text-align: center;
}

.user-avatar-container {
    display: flex;
    justify-content: center;
    margin-bottom: 1rem;
}

.user-avatar {
    position: relative;
    width: 60px;
    height: 60px;
}

.user-avatar img {
    width: 100%;
    height: 100%;
    border-radius: 50%;
    object-fit: cover;
    border: 3px solid var(--gray-200);
}

.user-status {
    position: absolute;
    bottom: 2px;
    right: 2px;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    border: 3px solid var(--primary-white);
}

.user-status.online {
    background: var(--accent-green);
}

.user-name {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--primary-black);
    margin-bottom: 0.25rem;
}

.user-university {
    font-size: 0.85rem;
    color: var(--gray-500);
}

/* Sidebar Menu */
.sidebar-menu {
    flex: 1;
    padding: 1rem 0;
    list-style: none;
}

.menu-item {
    margin-bottom: 0.25rem;
}

.menu-link {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 0.875rem 1.5rem;
    color: var(--gray-600);
    text-decoration: none;
    transition: var(--transition);
    position: relative;
}

.menu-link:hover {
    background: var(--gray-50);
    color: var(--primary-black);
}

.menu-item.active .menu-link {
    background: var(--primary-black);
    color: var(--primary-white);
}

.menu-icon {
    font-size: 1.1rem;
    width: 20px;
    text-align: center;
}

.menu-text {
    flex: 1;
    font-weight: 500;
}

.menu-badge {
    padding: 0.25rem 0.5rem;
    background: var(--accent-green);
    color: var(--primary-white);
    border-radius: 10px;
    font-size: 0.7rem;
    font-weight: 600;
}

.menu-badge.coming-soon {
    background: var(--gray-400);
}

.menu-indicator {
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 4px;
    height: 0;
    background: var(--primary-black);
    transition: var(--transition);
}

.menu-item.active .menu-indicator {
    height: 60%;
}

/* Sidebar Footer */
.sidebar-footer {
    padding: 1.5rem;
    border-top: 1px solid var(--gray-200);
}

.credit-widget {
    margin-bottom: 1rem;
    padding: 1rem;
    background: var(--gray-50);
    border-radius: var(--border-radius);
}

.credit-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 0.75rem;
}

.credit-icon {
    width: 36px;
    height: 36px;
    background: var(--accent-yellow);
    color: var(--primary-white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
}

.credit-info {
    flex: 1;
}

.credit-amount {
    display: block;
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--primary-black);
    font-family: 'JetBrains Mono', monospace;
}

.credit-label {
    font-size: 0.8rem;
    color: var(--gray-500);
}

.btn-credit-buy {
    width: 100%;
    padding: 0.5rem;
    background: var(--primary-black);
    color: var(--primary-white);
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    font-size: 0.85rem;
    font-weight: 500;
}

.logout-btn {
    width: 100%;
    padding: 0.75rem;
    background: none;
    border: 2px solid var(--gray-200);
    border-radius: var(--border-radius);
    color: var(--gray-600);
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    font-size: 0.9rem;
    font-weight: 500;
}

.logout-btn:hover {
    background: var(--accent-red);
    border-color: var(--accent-red);
    color: var(--primary-white);
}

/* Mobile Backdrop */
.mobile-backdrop {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
    z-index: 1999;
    display: none;
    opacity: 0;
    transition: var(--transition);
}

.mobile-backdrop.active {
    display: block;
    opacity: 1;
}

/* Global Layout Fixes */
html, body {
    overflow-x: hidden !important;
    width: 100% !important;
    max-width: 100% !important;
}

.dashboard-container {
    overflow-x: hidden !important;
    width: 100% !important;
    max-width: 100% !important;
}

/* Main Content */
.main-content {
    flex: 1 !important;
    margin-left: 280px !important;
    transition: var(--transition);
    min-height: 100vh;
    position: relative !important;
    z-index: 1 !important;
    overflow-x: hidden !important;
    width: calc(100% - 280px) !important;
    max-width: calc(100% - 280px) !important;
}

/* Compact Header */
.listings-header {
    background: var(--primary-white);
    box-shadow: var(--shadow-md);
    position: sticky;
    top: 0;
    z-index: 1000;
    border-bottom: 1px solid var(--gray-200);
}

.header-content {
    max-width: 1400px;
    margin: 0 auto;
    padding: 1.5rem 2rem;
}

.header-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.page-title-section h1 {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-black);
    margin-bottom: 0.5rem;
}

.page-subtitle {
    font-size: 1rem;
    color: var(--gray-600);
    margin: 0;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.user-credits {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1rem;
    background: var(--primary-black);
    color: var(--primary-white);
    border-radius: var(--border-radius);
    font-weight: 600;
    font-family: 'JetBrains Mono', monospace;
}

.user-credits i {
    color: var(--accent-yellow);
}

.stats-quick {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 0.9rem;
    color: var(--gray-600);
}

.stat-item-quick .stat-number {
    font-weight: 700;
    color: var(--primary-black);
    font-family: 'JetBrains Mono', monospace;
}

.stat-divider {
    color: var(--gray-400);
}

/* Search Section */
.search-section-compact {
    margin-bottom: 1rem;
}

.search-bar-main {
    display: flex;
    justify-content: center;
    margin-bottom: 1rem;
}

.search-input-wrapper {
    position: relative;
    width: 100%;
    max-width: 600px;
}

.search-input {
    width: 100%;
    padding: 0.875rem 1rem 0.875rem 3rem;
    padding-right: 120px;
    border: 2px solid var(--gray-200);
    border-radius: 50px;
    font-size: 0.95rem;
    transition: var(--transition);
    background: var(--primary-white);
}

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

.search-icon {
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--gray-400);
    font-size: 1rem;
}

.search-clear {
    position: absolute;
    right: 120px;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: var(--gray-400);
    cursor: pointer;
    padding: 0.25rem;
    border-radius: 50%;
    transition: var(--transition);
}

.search-btn {
    position: absolute;
    right: 4px;
    top: 4px;
    bottom: 4px;
    padding: 0 1.5rem;
    background: var(--primary-black);
    color: var(--primary-white);
    border: none;
    border-radius: 50px;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.search-btn:hover {
    background: var(--gray-800);
}

.quick-filters-row {
    display: flex;
    justify-content: center;
}

.quick-filters {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.quick-label {
    font-size: 0.9rem;
    color: var(--gray-500);
    font-weight: 500;
}

.quick-tag {
    padding: 0.5rem 1rem;
    background: var(--gray-100);
    border: none;
    border-radius: 20px;
    font-size: 0.85rem;
    cursor: pointer;
    transition: var(--transition);
    color: var(--gray-700);
}

.quick-tag:hover {
    background: var(--primary-black);
    color: var(--primary-white);
}

/* Main Listings */
.listings-main {
    max-width: 1400px;
    margin: 0 auto;
    padding: 2rem;
}

.listings-content {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: 2rem;
}

/* Filters Sidebar */
.filters-sidebar {
    background: var(--primary-white);
    border-radius: var(--border-radius-lg);
    padding: 1.5rem;
    height: fit-content;
    position: sticky;
    top: 140px;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--gray-200);
}

.filters-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--gray-200);
}

.filters-header h3 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--primary-black);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.filters-clear {
    background: none;
    border: none;
    color: var(--accent-blue);
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 500;
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.filters-clear:hover {
    background: var(--gray-100);
}

.filter-group {
    margin-bottom: 1.5rem;
}

.filter-title {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem 0;
    font-size: 1rem;
    font-weight: 600;
    color: var(--primary-black);
    cursor: pointer;
    border-bottom: 1px solid var(--gray-200);
    transition: var(--transition);
}

.filter-title:hover {
    color: var(--accent-blue);
}

.filter-title i {
    font-size: 0.8rem;
    color: var(--gray-400);
    transition: var(--transition);
}

.filter-group.expanded .filter-title i {
    transform: rotate(180deg);
}

.filter-options {
    padding-top: 1rem;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    max-height: 0;
    overflow: hidden;
    transition: var(--transition);
}

.filter-group.expanded .filter-options {
    max-height: 500px;
}

.filter-option {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    cursor: pointer;
    font-size: 0.9rem;
    color: var(--gray-700);
    transition: var(--transition);
    padding: 0.25rem 0;
}

.filter-option:hover {
    color: var(--primary-black);
}

.filter-option input {
    display: none;
}

.checkmark {
    width: 18px;
    height: 18px;
    border: 2px solid var(--gray-300);
    border-radius: 4px;
    position: relative;
    transition: var(--transition);
    flex-shrink: 0;
}

.filter-option input:checked+.checkmark {
    background: var(--primary-black);
    border-color: var(--primary-black);
}

.filter-option input:checked+.checkmark::after {
    content: '';
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    width: 4px;
    height: 8px;
    border: solid var(--primary-white);
    border-width: 0 2px 2px 0;
    transform: translate(-50%, -65%) rotate(45deg);
}

.option-text {
    flex: 1;
}

.option-count {
    font-size: 0.8rem;
    color: var(--gray-400);
    font-family: 'JetBrains Mono', monospace;
}

/* Papers Section */
.papers-section {
    background: var(--primary-white);
    border-radius: var(--border-radius-lg);
    padding: 1.5rem;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--gray-200);
}

.papers-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--gray-200);
}

.results-info h2 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-black);
    margin-bottom: 0.25rem;
}

.results-info p {
    font-size: 0.9rem;
    color: var(--gray-500);
}

.papers-controls {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.view-toggle {
    display: flex;
    background: var(--gray-100);
    border-radius: var(--border-radius);
    padding: 4px;
}

.view-btn {
    width: 40px;
    height: 40px;
    background: none;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--gray-500);
    transition: var(--transition);
}

.view-btn.active {
    background: var(--primary-white);
    color: var(--primary-black);
    box-shadow: var(--shadow-sm);
}

.sort-dropdown {
    position: relative;
}

.sort-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1rem;
    background: var(--gray-100);
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: 0.9rem;
    transition: var(--transition);
}

.sort-btn:hover {
    background: var(--gray-200);
}

.sort-options {
    position: absolute;
    top: 100%;
    right: 0;
    margin-top: 0.5rem;
    background: var(--primary-white);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--gray-200);
    min-width: 200px;
    z-index: 100;
    display: none;
}

.sort-options.show {
    display: block;
    animation: dropdownSlideIn 0.2s ease;
}

@keyframes dropdownSlideIn {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.sort-option {
    width: 100%;
    padding: 0.75rem 1rem;
    background: none;
    border: none;
    text-align: left;
    cursor: pointer;
    font-size: 0.9rem;
    color: var(--gray-700);
    transition: var(--transition);
}

.sort-option:hover {
    background: var(--gray-50);
}

.sort-option.active {
    background: var(--gray-100);
    color: var(--primary-black);
    font-weight: 600;
}

.filters-toggle {
    display: none;
    padding: 0.75rem 1rem;
    background: var(--primary-black);
    color: var(--primary-white);
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 500;
    gap: 0.5rem;
    align-items: center;
}

/* Papers Grid */
.papers-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.papers-grid.list-view {
    grid-template-columns: 1fr;
}

.paper-card {
    background: var(--primary-white);
    border: 1px solid var(--gray-200);
    border-radius: var(--border-radius-lg);
    padding: 1.5rem;
    transition: var(--transition);
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.paper-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--accent-blue);
    transform: scaleX(0);
    transition: var(--transition);
}

.paper-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

.paper-card:hover::before {
    transform: scaleX(1);
}

.paper-card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 1rem;
}

.paper-type {
    padding: 0.25rem 0.75rem;
    background: var(--gray-100);
    border-radius: 12px;
    font-size: 0.7rem;
    font-weight: 600;
    color: var(--gray-600);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.paper-type.final {
    background: var(--accent-green);
    color: var(--primary-white);
}

.paper-type.midterm {
    background: var(--accent-blue);
    color: var(--primary-white);
}

.paper-type.quiz {
    background: var(--accent-yellow);
    color: var(--primary-white);
}

.paper-menu {
    background: none;
    border: none;
    color: var(--gray-400);
    cursor: pointer;
    padding: 0.25rem;
    border-radius: 4px;
    transition: var(--transition);
}

.paper-menu:hover {
    background: var(--gray-100);
    color: var(--gray-600);
}

.paper-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--primary-black);
    margin-bottom: 0.75rem;
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.paper-meta {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.meta-row {
    display: flex;
    align-items: center;
    gap: 1rem;
    font-size: 0.85rem;
    color: var(--gray-600);
}

.meta-item {
    display: flex;
    align-items: center;
    gap: 0.375rem;
}

.meta-item i {
    font-size: 0.8rem;
    color: var(--gray-400);
}

.paper-stats {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 1rem;
    border-top: 1px solid var(--gray-200);
}

.paper-rating {
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.paper-rating .fas {
    color: var(--accent-yellow);
    font-size: 0.8rem;
}

.rating-value {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--primary-black);
    margin-left: 0.25rem;
    font-family: 'JetBrains Mono', monospace;
}

.paper-actions {
    display: flex;
    gap: 0.5rem;
}

.paper-action {
    padding: 0.5rem;
    background: var(--gray-100);
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    color: var(--gray-600);
    transition: var(--transition);
    font-size: 0.9rem;
}

.paper-action:hover {
    background: var(--gray-200);
    color: var(--primary-black);
}

.paper-action.primary {
    background: var(--primary-black);
    color: var(--primary-white);
}

.paper-action.primary:hover {
    background: var(--gray-800);
}

/* Pagination */
.pagination-container {
    display: flex;
    justify-content: center;
    margin-top: 3rem;
}

.pagination {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.page-btn {
    padding: 0.75rem 1rem;
    background: var(--primary-white);
    border: 2px solid var(--gray-200);
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--gray-700);
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.page-btn:hover:not(:disabled) {
    border-color: var(--primary-black);
    background: var(--gray-50);
}

.page-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.page-numbers {
    display: flex;
    gap: 0.25rem;
}

.page-number {
    width: 40px;
    height: 40px;
    background: var(--primary-white);
    border: 2px solid var(--gray-200);
    border-radius: var(--border-radius);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--gray-700);
    transition: var(--transition);
}

.page-number:hover {
    border-color: var(--primary-black);
    background: var(--gray-50);
}

.page-number.active {
    background: var(--primary-black);
    border-color: var(--primary-black);
    color: var(--primary-white);
}

/* Modal */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 3000;
    display: none;
    align-items: center;
    justify-content: center;
    padding: 2rem;
}

.modal.show {
    display: flex;
}

.modal-backdrop {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
}

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

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

    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

.modal-header {
    padding: 1.5rem;
    border-bottom: 1px solid var(--gray-200);
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
}

.modal-header h2 {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--primary-black);
    line-height: 1.4;
    flex: 1;
    margin-right: 1rem;
}

.modal-close {
    width: 32px;
    height: 32px;
    background: none;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--gray-400);
    transition: var(--transition);
}

.modal-close:hover {
    background: var(--gray-100);
    color: var(--gray-600);
}

.modal-body {
    padding: 1.5rem;
}

.paper-details {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.paper-meta {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1rem;
}

.meta-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.9rem;
    color: var(--gray-600);
}

.meta-item i {
    color: var(--gray-400);
}

.paper-description h4,
.paper-tags h4 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--primary-black);
    margin-bottom: 0.5rem;
}

.paper-description p {
    color: var(--gray-600);
    line-height: 1.6;
}

.tags-list {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.tag {
    padding: 0.25rem 0.75rem;
    background: var(--gray-200);
    border-radius: 12px;
    font-size: 0.8rem;
    color: var(--gray-700);
}

.paper-stats {
    display: flex;
    justify-content: space-around;
    padding: 1rem;
    background: var(--gray-50);
    border-radius: var(--border-radius);
}

.stat {
    text-align: center;
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.stat i {
    color: var(--gray-400);
    font-size: 1.2rem;
}

.stat span:nth-child(2) {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--primary-black);
    font-family: 'JetBrains Mono', monospace;
}

.stat span:nth-child(3) {
    font-size: 0.8rem;
    color: var(--gray-500);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.modal-footer {
    padding: 1.5rem;
    border-top: 1px solid var(--gray-200);
    display: flex;
    gap: 1rem;
    justify-content: flex-end;
}

/* Buttons */
.btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: var(--border-radius);
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    text-decoration: none;
    font-family: inherit;
    outline: none;
}

.btn-primary {
    background: var(--primary-black);
    color: var(--primary-white);
}

.btn-primary:hover {
    background: var(--gray-800);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background: var(--primary-white);
    color: var(--primary-black);
    border: 2px solid var(--gray-200);
}

.btn-secondary:hover {
    border-color: var(--primary-black);
    background: var(--gray-50);
}

/* Toast Notifications */
.toast-container {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 4000;
    display: flex;
    flex-direction: column;
    gap: 1rem;
    max-width: 400px;
}

.toast {
    background: var(--primary-white);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--gray-200);
    padding: 1rem;
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    min-width: 300px;
    animation: toastSlideIn 0.3s ease;
}

.toast.success {
    border-left: 4px solid var(--accent-green);
}

.toast.error {
    border-left: 4px solid var(--accent-red);
}

.toast.warning {
    border-left: 4px solid var(--accent-yellow);
}

.toast.info {
    border-left: 4px solid var(--accent-blue);
}

@keyframes toastSlideIn {
    from {
        opacity: 0;
        transform: translateX(100%);
    }

    to {
        opacity: 1;
        transform: translateX(0);
    }
}

/* Responsive Design */
@media (max-width: 1200px) {
    .listings-content {
        grid-template-columns: 1fr;
    }

    .filters-sidebar {
        display: none;
        position: fixed;
        top: 0;
        right: 0;
        width: 320px;
        height: 100vh;
        z-index: 2000;
        overflow-y: auto;
    }

    .filters-sidebar.show {
        display: block;
        animation: slideInRight 0.3s ease;
    }

    .filters-toggle {
        display: flex;
    }
}

@media (max-width: 768px) {
    .mobile-menu-btn {
        display: flex;
    }

    .sidebar {
        transform: translateX(-100%) !important;
        position: fixed !important;
        left: 0 !important;
        top: 0 !important;
        height: 100vh !important;
        z-index: 2000 !important;
    }

    .sidebar.active {
        transform: translateX(0) !important;
    }

    .main-content {
        margin-left: 0 !important;
        width: 100% !important;
        max-width: 100% !important;
        position: relative !important;
        z-index: 1 !important;
    }

    .sidebar-close {
        display: flex;
    }

    .header-top {
        flex-direction: column;
        gap: 1rem;
        align-items: stretch;
    }

    .search-section-compact {
        order: -1;
    }

    .quick-filters {
        flex-wrap: wrap;
        justify-content: center;
    }

    .papers-grid {
        grid-template-columns: 1fr;
    }

    .page-btn .btn-text {
        display: none;
    }
}

@media (max-width: 480px) {
    .main-content {
        margin-left: 0 !important;
        width: 100%;
        position: relative;
        z-index: 1;
    }
    
    .listings-main {
        padding: 1rem;
    }

    .header-content {
        padding: 1rem;
    }

    .page-title-section h1 {
        font-size: 1.5rem;
    }

    .user-credits {
        padding: 0.5rem 0.75rem;
        font-size: 0.8rem;
    }

    .stats-quick {
        flex-direction: column;
        gap: 0.25rem;
        text-align: center;
    }

    .stat-divider {
        display: none;
    }
}

/* Utility Classes */
.hidden {
    display: none !important;
}

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

.animate__fadeInUp {
    animation: fadeInUp 0.5s ease;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideInRight {
    from {
        transform: translateX(100%);
    }

    to {
        transform: translateX(0);
    }
}