:root {
    --primary-color: #e91e63;
    --primary-light: #f06292;
    --primary-dark: #c2185b;
    --secondary-color: #9c27b0;
    --background-color: #13111C;
    --card-background: #1E1B2E;
    --surface-light: rgba(30, 27, 46, 0.6);
    --surface-dark: rgba(19, 17, 28, 0.6);
    --text-primary: rgba(255, 255, 255, 0.95);
    --text-secondary: rgba(255, 255, 255, 0.7);
    --border-color: rgba(255, 255, 255, 0.08);
    --error-color: #ff4444;
    --success-color: #00C851;
}

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

body {
    background: var(--background-color);
    color: var(--text-primary);
    font-family: 'Space Grotesk', sans-serif;
    min-height: 100vh;
    line-height: 1.6;
}

/* Layout */
.app-container {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Navigation */
.top-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.2rem 2.5rem;
    background: rgba(30, 27, 46, 0.98);
    backdrop-filter: blur(10px);
}

.logo {
    color: var(--primary-color);
    font-size: 1.5rem;
    font-weight: 600;
    letter-spacing: 0.5px;
}

.nav-right {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.user-info {
    color: rgba(255, 255, 255, 0.9);
    font-size: 0.95rem;
    letter-spacing: 0.3px;
}

.logout-button {
    color: var(--primary-color);
    text-decoration: none;
    font-size: 0.95rem;
    font-weight: 500;
    transition: all 0.3s ease;
}

.logout-button:hover {
    color: #ff4081;
}

/* Search Container */
.search-container {
    width: 90%;
    max-width: 800px;
    margin: 3rem auto;
    display: flex;
    flex-direction: column;
    gap: 1.2rem;
}

/* Search Input Wrapper */
.search-input-wrapper {
    width: 100%;
    background: rgba(30, 27, 46, 0.95);
    border-radius: 15px;
    padding: 1rem 1.5rem;
    border: 1px solid rgba(255, 255, 255, 0.08);
    transition: all 0.3s ease;
}

.search-input-wrapper:focus-within {
    border-color: rgba(255, 255, 255, 0.15);
    box-shadow: 0 0 20px rgba(233, 30, 99, 0.1);
}

/* Search Input */
.search-input {
    width: 100%;
    padding: 16px 24px;
    font-size: 1.1rem;
    background: rgba(255, 255, 255, 0.08);
    border: 2px solid rgba(255, 255, 255, 0.1);
    border-radius: 16px;
    color: var(--text-primary);
    transition: all 0.3s ease;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.search-input:focus {
    outline: none;
    border-color: var(--primary-color);
    background: rgba(255, 255, 255, 0.12);
    box-shadow: 0 8px 24px rgba(233, 30, 99, 0.15);
    transform: translateY(-1px);
}

.search-input::placeholder {
    color: rgba(255, 255, 255, 0.5);
    font-weight: 400;
}

/* Filters Row */
.filters-row {
    display: flex;
    align-items: center;
    gap: 1rem;
    justify-content: space-between;
}

/* Filter Selects */
.filter-select {
    background: rgba(30, 27, 46, 0.95);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 12px;
    color: rgba(255, 255, 255, 0.9);
    padding: 0.8rem 2.5rem 0.8rem 1.2rem;
    font-size: 0.95rem;
    cursor: pointer;
    outline: none;
    flex: 1;
    appearance: none;
    background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='white' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3e%3cpolyline points='6 9 12 15 18 9'%3e%3c/polyline%3e%3c/svg%3e");
    background-repeat: no-repeat;
    background-position: right 1rem center;
    background-size: 1em;
    transition: all 0.3s ease;
}

.filter-select:hover {
    border-color: rgba(255, 255, 255, 0.15);
    background-color: rgba(40, 37, 56, 0.98);
}

/* Search Button */
.search-button {
    background: linear-gradient(135deg, #e91e63, #f06292);
    color: white;
    border: none;
    padding: 0.8rem 2.5rem;
    border-radius: 12px;
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    text-transform: uppercase;
    letter-spacing: 1px;
    min-width: 120px;
    box-shadow: 0 4px 15px rgba(233, 30, 99, 0.2);
}

.search-button:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 20px rgba(233, 30, 99, 0.3);
    background: linear-gradient(135deg, #ec407a, #f48fb1);
}

.search-button:active {
    transform: translateY(0);
    box-shadow: 0 2px 10px rgba(233, 30, 99, 0.2);
}

/* Results Section */
.results-section {
    margin-top: 2rem;
    padding: 0 2rem;
}

/* Loading Overlay */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(13, 12, 20, 0.8);
    backdrop-filter: blur(5px);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.loading-overlay.hidden {
    display: none;
}

/* Responsive Design */
@media (max-width: 768px) {
    .top-nav {
        padding: 1rem 1.5rem;
    }

    .search-container {
        margin: 2rem auto;
    }

    .filters-row {
        flex-direction: column;
        gap: 0.8rem;
    }

    .filter-select, 
    .search-button {
        width: 100%;
    }
}

/* Main Content */
.main-content {
    flex: 1;
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
    width: 100%;
}

/* Search Section */
.search-section {
    margin: 2rem auto;
    max-width: 700px;
}

.results-container {
    padding: 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.results-count {
    color: var(--text-primary);
    font-size: 1.1rem;
    margin-bottom: 1.5rem;
    opacity: 0.8;
}

.results-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(450px, 1fr));
    gap: 1.5rem;
    padding: 2rem;
    max-width: 1400px;
    margin: 0 auto;
}

.paper-card {
    background: var(--card-background);
    border-radius: 15px;
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
    height: 100%;
}

.paper-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
}

.paper-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.paper-date {
    color: var(--primary-color);
    font-size: 0.9rem;
    opacity: 0.9;
}

.paper-title {
    color: var(--text-primary);
    font-size: 1.5rem;
    line-height: 1.3;
    margin: 0;
    font-weight: 600;
}

.paper-author {
    color: var(--text-primary);
    font-size: 1rem;
    opacity: 0.9;
}

.paper-abstract {
    color: var(--text-primary);
    font-size: 0.95rem;
    line-height: 1.5;
    opacity: 0.7;
    margin: 0;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.paper-actions {
    display: flex;
    gap: 12px;
    justify-content: space-between;
    align-items: center;
    margin-top: auto;
}

.action-button {
    flex: 1;
    padding: 12px 20px;
    border-radius: 12px;
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    text-align: center;
    text-decoration: none;
    border: none;
}

.action-button.pdf-button {
    background: linear-gradient(135deg, #FF4B2B, #FF416C);
    color: white;
}

.action-button.arxiv-button {
    background: linear-gradient(135deg, #4A00E0, #8E2DE2);
    color: white;
}

.action-button.analyze {
    background: linear-gradient(135deg, #00B4DB, #0083B0);
    color: white;
}

.action-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.2);
    filter: brightness(110%);
}

.action-button:active {
    transform: translateY(0);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

/* Add subtle glow effect on hover */
.action-button.pdf-button:hover {
    box-shadow: 0 8px 20px rgba(255, 75, 43, 0.3);
}

.action-button.arxiv-button:hover {
    box-shadow: 0 8px 20px rgba(142, 45, 226, 0.3);
}

.action-button.analyze:hover {
    box-shadow: 0 8px 20px rgba(0, 180, 219, 0.3);
}

@media (max-width: 768px) {
    .paper-actions {
        flex-direction: column;
        gap: 8px;
    }
    
    .action-button {
        width: 100%;
    }
}

/* Analysis Section */
.analysis-container {
    background: var(--card-background);
    border-radius: 10px;
    padding: 20px;
    margin-top: 20px;
}

.analysis-section {
    margin-bottom: 2rem;
}

.analysis-section h3 {
    margin-bottom: 1rem;
    color: var(--primary-color);
}

/* Analysis Section Tabs */
.analysis-tabs {
    display: flex;
    gap: 0;
    padding: 1.5rem 2rem;
    background: rgba(19, 17, 28, 0.95);
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    position: relative;
}

.tab-button {
    background: transparent;
    border: none;
    color: rgba(255, 255, 255, 0.6);
    padding: 1rem 2.5rem;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.tab-button:hover {
    color: rgba(255, 255, 255, 0.9);
}

.tab-button.active {
    color: #E91E63;
    font-weight: 600;
}

.tab-button.active::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 0;
    width: 100%;
    height: 2px;
    background: linear-gradient(90deg, #E91E63, #F06292);
    animation: slideIn 0.3s ease;
}

@keyframes slideIn {
    from {
        transform: scaleX(0);
    }
    to {
        transform: scaleX(1);
    }
}

/* Tab Content Container */
.tab-content {
    display: none;
    opacity: 0;
    padding: 2rem;
    transition: all 0.3s ease;
}

.tab-content.active {
    display: block;
    opacity: 1;
    animation: fadeIn 0.4s ease;
}

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

/* Paper Analysis Content */
.paper-analysis {
    padding: 2rem;
}

.analysis-section {
    margin-bottom: 2.5rem;
}

.analysis-section h3 {
    color: var(--primary-color);
    font-size: 1.3rem;
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.8rem;
}

.analysis-section p {
    color: rgba(255, 255, 255, 0.9);
    line-height: 1.7;
    font-size: 1rem;
}

/* Chat Interface Styles */
.chat-container {
    height: 600px;
    display: flex;
    flex-direction: column;
    background: var(--surface-dark);
    border-radius: 20px;
    border: 1px solid var(--border-color);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
    margin: 2rem auto;
    overflow: hidden;
}

.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.message-wrapper {
    display: flex;
    gap: 1rem;
    align-items: flex-start;
    opacity: 0;
    transform: translateY(10px);
    animation: messageAppear 0.3s ease forwards;
}

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

.message-avatar {
    width: 38px;
    height: 38px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    font-weight: 600;
    font-size: 0.9rem;
}

.user-avatar {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    color: white;
}

.ai-avatar {
    background: var(--surface-light);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
}

.message {
    max-width: 85%;
    padding: 1.2rem 1.5rem;
    border-radius: 16px;
    line-height: 1.6;
    font-size: 0.95rem;
    letter-spacing: 0.2px;
}

.user-message {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    color: white;
    margin-left: auto;
    border-bottom-right-radius: 4px;
    box-shadow: 0 4px 15px rgba(233, 30, 99, 0.2);
}

.ai-message {
    background: var(--surface-light);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-bottom-left-radius: 4px;
}

/* Markdown Styles in AI Messages */
.ai-message h1, 
.ai-message h2, 
.ai-message h3 {
    margin-top: 1.2rem;
    margin-bottom: 0.8rem;
    color: var(--text-primary);
    font-weight: 600;
}

.ai-message h1 { font-size: 1.4rem; }
.ai-message h2 { font-size: 1.2rem; }
.ai-message h3 { font-size: 1.1rem; }

.ai-message p {
    margin-bottom: 1rem;
    line-height: 1.7;
}

.ai-message ul, 
.ai-message ol {
    margin: 1rem 0;
    padding-left: 1.5rem;
}

.ai-message li {
    margin-bottom: 0.5rem;
    line-height: 1.6;
}

.ai-message strong {
    color: var(--primary-color);
    font-weight: 600;
}

.ai-message em {
    color: var(--text-secondary);
    font-style: italic;
}

.ai-message code {
    background: var(--surface-dark);
    padding: 0.2rem 0.4rem;
    border-radius: 4px;
    font-family: 'Fira Code', monospace;
    font-size: 0.9em;
}

.ai-message pre {
    background: var(--surface-dark);
    padding: 1rem;
    border-radius: 8px;
    overflow-x: auto;
    margin: 1rem 0;
}

.ai-message blockquote {
    border-left: 3px solid var(--primary-color);
    margin: 1rem 0;
    padding-left: 1rem;
    color: var(--text-secondary);
}

/* Chat Input Area */
.chat-input-area {
    padding: 1.5rem;
    background: var(--surface-light);
    border-top: 1px solid var(--border-color);
    display: flex;
    gap: 1rem;
    align-items: center;
}

.chat-input {
    flex: 1;
    background: var(--surface-dark);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1rem 1.2rem;
    color: var(--text-primary);
    font-size: 0.95rem;
    font-family: 'Space Grotesk', sans-serif;
    transition: all 0.3s ease;
}

.chat-input:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(233, 30, 99, 0.1);
    outline: none;
}

.chat-send-button {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    color: white;
    border: none;
    padding: 1rem 1.8rem;
    border-radius: 12px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    text-transform: uppercase;
    letter-spacing: 1px;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-family: 'Space Grotesk', sans-serif;
    box-shadow: 0 4px 15px rgba(233, 30, 99, 0.2);
}

.chat-send-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(233, 30, 99, 0.3);
}

.chat-send-button:active {
    transform: translateY(0);
}

/* AI Thinking Animation */
.ai-thinking {
    display: flex;
    align-items: center;
    padding: 0.8rem 1.2rem;
    background: rgba(30, 27, 46, 0.4);
    border-radius: 12px;
    min-width: 80px;
}

.ai-thinking-dots {
    display: flex;
    gap: 4px;
    justify-content: center;
    align-items: center;
    height: 24px;
}

.ai-thinking-dot {
    width: 6px;
    height: 6px;
    background: var(--primary-color);
    border-radius: 50%;
    animation: thinking 1.4s infinite ease-in-out;
    opacity: 0.7;
}

/* Smoother animation for dots */
@keyframes thinking {
    0%, 80%, 100% { 
        transform: scale(0.6);
        opacity: 0.3;
    }
    40% { 
        transform: scale(1);
        opacity: 0.8;
    }
}

/* Scrollbar Styling */
.chat-messages::-webkit-scrollbar {
    width: 8px;
}

.chat-messages::-webkit-scrollbar-track {
    background: var(--surface-dark);
}

.chat-messages::-webkit-scrollbar-thumb {
    background: var(--surface-light);
    border-radius: 4px;
}

.chat-messages::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.2);
}

/* Responsive Design */
@media (max-width: 768px) {
    .chat-container {
        height: calc(100vh - 4rem);
        margin: 1rem;
    }

    .quick-questions {
        padding: 1rem;
    }

    .quick-question-btn {
        padding: 0.6rem 1rem;
        font-size: 0.85rem;
    }

    .message {
        max-width: 90%;
        padding: 1rem;
    }

    .chat-input-area {
        padding: 1rem;
    }

    .chat-send-button {
        padding: 0.8rem 1.2rem;
    }

    .paper-actions {
        flex-direction: column;
        gap: 8px;
    }
    
    .action-button {
        width: 100%;
    }
}

/* Breadcrumb Styles */
.breadcrumb {
    padding: 1rem 2rem;
    background: var(--background-color);
    display: flex;
    align-items: center;
    gap: 1rem;
}

.back-button {
    background: transparent;
    border: none;
    color: var(--primary-color);
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    border-radius: 15px;
    transition: all 0.3s ease;
}

.back-button:hover {
    background: rgba(255, 255, 255, 0.05);
}

/* Content Sections */
.content-section {
    display: none;
    padding: 2rem;
}

.content-section.active {
    display: block;
}

/* History and Saved Papers Grid */
.history-grid, .saved-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

/* Tab Styles */
.tabs-container {
    background: transparent;
    padding: 0;
    margin-top: 0;
}

.tabs {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    padding-bottom: 10px;
}

.tab-button {
    background: transparent;
    border: none;
    color: var(--text-primary);
    padding: 10px 20px;
    border-radius: 5px;
    cursor: pointer;
    transition: all 0.3s ease;
    opacity: 0.7;
}

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

.tab-button.active {
    background: var(--primary-color);
    opacity: 1;
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

/* Chat Styles */
.chat-container {
    height: 500px;
    display: flex;
    flex-direction: column;
}

.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.chat-input-area {
    display: flex;
    gap: 10px;
    padding: 20px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.chat-input-area input {
    flex: 1;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    padding: 10px 15px;
    border-radius: 5px;
    color: var(--text-primary);
}

.chat-send-button {
    background: var(--primary-color);
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 5px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.chat-send-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(233, 30, 99, 0.4);
}

/* Message Styles */
.message {
    padding: 10px 15px;
    border-radius: 10px;
    max-width: 80%;
}

.user-message {
    background: var(--primary-color);
    align-self: flex-end;
}

.ai-message {
    background: var(--card-background);
    align-self: flex-start;
}

.loading {
    opacity: 0.7;
}

.error {
    background: var(--error-color);
}

/* Add these new styles for navigation */
.analysis-navigation {
    display: flex;
    align-items: center;
    gap: 20px;
    margin-bottom: 20px;
    padding: 10px 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.back-to-results {
    background: transparent;
    border: none;
    color: var(--primary-color);
    padding: 8px 16px;
    border-radius: 20px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: all 0.3s ease;
    font-size: 0.9rem;
}

.back-to-results:hover {
    background: rgba(233, 30, 99, 0.1);
    transform: translateX(-2px);
}

.current-paper-title {
    font-size: 1.2rem;
    color: var(--text-primary);
    margin: 0;
    flex: 1;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* Responsive adjustments */
@media (max-width: 768px) {
    .analysis-navigation {
        flex-direction: column;
        align-items: flex-start;
        gap: 10px;
    }

    .current-paper-title {
        font-size: 1rem;
    }

    .back-to-results {
        width: 100%;
        justify-content: center;
    }
}

/* Saved Papers Styles */
.saved-paper-card {
    background: var(--card-background);
    border-radius: 12px;
    padding: 20px;
    margin-bottom: 20px;
    transition: all 0.3s ease;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.saved-paper-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
}

.saved-date {
    font-size: 0.8rem;
    color: var(--primary-color);
    margin-bottom: 10px;
    opacity: 0.8;
}

.empty-state {
    text-align: center;
    padding: 40px;
    color: var(--text-primary);
}

.empty-icon {
    font-size: 3rem;
    margin-bottom: 20px;
}

/* Notification Styles */
.notification {
    position: fixed;
    bottom: 20px;
    right: 20px;
    padding: 12px 24px;
    border-radius: 8px;
    background: var(--card-background);
    color: var(--text-primary);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
    transform: translateY(100px);
    opacity: 0;
    transition: all 0.3s ease;
    z-index: 1000;
}

.notification.show {
    transform: translateY(0);
    opacity: 1;
}

.notification.success {
    border-left: 4px solid #00C851;
}

.notification.error {
    border-left: 4px solid var(--error-color);
}

.notification.info {
    border-left: 4px solid #33b5e5;
}

/* Action Button Styles */
.action-button.save {
    background: #00C851;
    color: white;
}

.action-button.remove {
    background: var(--error-color);
    color: white;
}

/* Saved Papers Grid */
.saved-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
    padding: 20px;
}

@media (max-width: 768px) {
    .saved-grid {
        grid-template-columns: 1fr;
    }
    
    .notification {
        left: 20px;
        right: 20px;
        text-align: center;
    }
}

/* Updated Saved Papers Styles */
.section-title {
    color: var(--text-primary);
    font-size: 2rem;
    margin: 2rem 0;
    padding: 0 2rem;
}

.results-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(450px, 1fr));
    gap: 1.5rem;
    padding: 2rem;
    max-width: 1400px;
    margin: 0 auto;
}

.paper-card {
    background: var(--card-background);
    border-radius: 15px;
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
    height: 100%;
}

.paper-date {
    color: var(--primary-color);
    font-size: 0.9rem;
    opacity: 0.9;
}

.paper-title {
    color: var(--text-primary);
    font-size: 1.5rem;
    line-height: 1.3;
    margin: 0;
    font-weight: 600;
}

.paper-author {
    color: var(--text-primary);
    font-size: 1rem;
    opacity: 0.9;
}

.paper-abstract {
    color: var(--text-primary);
    font-size: 0.95rem;
    line-height: 1.5;
    opacity: 0.7;
    margin: 0;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.paper-actions {
    margin-top: auto;
    display: flex;
    flex-direction: row;
    gap: 12px;
    justify-content: space-between;
    align-items: center;
}

.action-row {
    display: flex;
    gap: 1rem;
    align-items: center;
    justify-content: center;
}

.save-row {
    width: 100%;
}

.action-button.remove {
    width: 100%;
    background: #ff4444;
    color: white;
    padding: 1rem;
    border-radius: 12px;
    font-weight: 600;
    text-transform: uppercase;
    border: none;
    cursor: pointer;
    transition: all 0.3s ease;
}

.action-button.remove:hover {
    background: #ff5555;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(255, 68, 68, 0.2);
}

.empty-state {
    text-align: center;
    padding: 4rem 2rem;
    color: var(--text-primary);
}

.empty-state .empty-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.empty-state h3 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

.empty-state p {
    color: var(--text-primary);
    opacity: 0.7;
}

/* Responsive adjustments */
@media (max-width: 768px) {
    .results-grid {
        grid-template-columns: 1fr;
        padding: 1rem;
    }

    .section-title {
        font-size: 1.5rem;
        margin: 1.5rem 0;
        padding: 0 1rem;
    }

    .paper-card {
        padding: 1rem;
    }

    .action-row {
        flex-wrap: wrap;
    }

    .action-button, .action-link {
        width: 100%;
        text-align: center;
    }
}

/* Add styles for back button and header */
.analysis-header {
    margin: 2rem 0;
    padding: 2rem;
    background: rgba(30, 27, 46, 0.98);
    border-radius: 15px;
    border: 1px solid rgba(255, 255, 255, 0.08);
}

.back-button {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: none;
    border: none;
    color: #E91E63;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    padding: 0.5rem 1rem;
    border-radius: 6px;
    transition: all 0.3s ease;
}

.back-button:hover {
    background: rgba(233, 30, 99, 0.1);
    transform: translateX(-2px);
}

.current-paper-title {
    color: var(--text-primary);
    font-size: 1.25rem;
    margin: 0;
    font-weight: 500;
    flex: 1;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* Update analysis container styles */
.analysis-container {
    padding: 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

/* Responsive styles */
@media (max-width: 768px) {
    .analysis-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 1rem;
    }

    .back-button {
        width: 100%;
        justify-content: center;
    }

    .current-paper-title {
        font-size: 1.1rem;
        text-align: center;
        width: 100%;
    }
}

/* Updated button styles */
.action-link {
    background: none;
    border: none;
    color: #4A7DFF;
    font-size: 0.95rem;
    font-weight: 600;
    padding: 12px 0;
    cursor: pointer;
    transition: all 0.2s ease;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.action-link:hover {
    opacity: 0.8;
}

.action-button {
    border: none;
    padding: 12px 24px;
    border-radius: 12px;
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    width: auto;
    text-align: center;
}

.action-button.analyze {
    background: #E91E63;
    color: white;
    min-width: 120px;
}

.action-button.save {
    background: #00C851;
    color: white;
    width: 100%;
    padding: 16px;
    font-size: 1rem;
    border-radius: 14px;
    margin-top: 8px;
}

.paper-actions {
    display: flex;
    flex-direction: row;
    margin-top: auto;
}

.action-row {
    display: flex;
    align-items: center;
    gap: 24px;
}

.save-row {
    display: flex;
    width: 100%;
    margin-top: 4px;
}

/* Hover effects */
.action-button:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.action-button.analyze:hover {
    background: #F0196B;
}

.action-button.save:hover {
    background: #00D455;
}

/* Paper card adjustments */
.paper-card {
    background: var(--card-background);
    border-radius: 16px;
    padding: 24px;
    display: flex;
    flex-direction: column;
    gap: 16px;
    min-height: 320px;
}

/* Responsive adjustments */
@media (max-width: 768px) {
    .action-row {
        flex-wrap: wrap;
        gap: 16px;
    }
    
    .action-button {
        width: 100%;
    }
    
    .action-link {
        text-align: center;
        padding: 12px;
        flex: 1;
    }
}

/* Add these new styles */
.action-button.remove {
    background: #ff4444;
    color: white;
    width: 100%;
    padding: 16px;
    font-size: 1rem;
    border-radius: 14px;
    margin-top: 8px;
}

.action-button.remove:hover {
    background: #ff5555;
}

.action-button.saved {
    background: #666;
    cursor: default;
}

.action-button.saved:hover {
    transform: none;
    box-shadow: none;
}

.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-primary);
}

.empty-state .empty-icon {
    font-size: 48px;
    margin-bottom: 20px;
}

.empty-state h3 {
    font-size: 24px;
    margin-bottom: 10px;
}

.empty-state p {
    color: var(--text-primary);
    opacity: 0.7;
}

/* Notification styles */
.notification {
    position: fixed;
    bottom: 20px;
    right: 20px;
    padding: 12px 24px;
    border-radius: 8px;
    background: var(--card-background);
    color: var(--text-primary);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
    transform: translateY(100px);
    opacity: 0;
    transition: all 0.3s ease;
    z-index: 1000;
}

.notification.show {
    transform: translateY(0);
    opacity: 1;
}

.notification.success {
    border-left: 4px solid #00C851;
}

.notification.error {
    border-left: 4px solid #ff4444;
}

.notification.info {
    border-left: 4px solid #33b5e5;
}

/* Updated saved papers grid styles */
.saved-papers-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
    padding: 24px;
    max-width: 1400px;
    margin: 0 auto;
}

.saved-paper-card {
    background: var(--card-background);
    border-radius: 16px;
    padding: 24px;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.saved-date {
    color: #E91E63;
    font-size: 14px;
    font-weight: 500;
}

.paper-title {
    color: var(--text-primary);
    font-size: 24px;
    line-height: 1.3;
    margin: 0;
    font-weight: 600;
}

.paper-author {
    color: var(--text-primary);
    font-size: 16px;
    opacity: 0.9;
}

.paper-abstract {
    color: var(--text-primary);
    font-size: 15px;
    line-height: 1.5;
    opacity: 0.7;
    margin: 0;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.paper-actions {
    margin-top: auto;
    display: flex;
    flex-direction: row;
    gap: 16px;
    align-items: center;
}

.action-row {
    display: flex;
    gap: 16px;
    align-items: center;
}

.action-link {
    background: none;
    border: none;
    color: #4A7DFF;
    font-size: 14px;
    font-weight: 600;
    padding: 0;
    cursor: pointer;
    transition: all 0.2s ease;
}

.action-button {
    border: none;
    padding: 12px 24px;
    border-radius: 12px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
}

.action-button.analyze {
    background: #E91E63;
    color: white;
}

.action-button.remove {
    background: #ff4444;
    color: white;
    width: 100%;
    padding: 16px;
}

.save-row {
    width: 100%;
}

/* Responsive styles */
@media (max-width: 1024px) {
    .saved-papers-grid {
        grid-template-columns: 1fr;
        padding: 16px;
    }

    .saved-paper-card {
        padding: 20px;
    }

    .action-row {
        flex-wrap: wrap;
        gap: 12px;
    }

    .action-button, 
    .action-link {
        width: 100%;
        text-align: center;
        padding: 12px;
    }
}

/* Search History Styles */
.history-title {
    color: var(--text-primary);
    font-size: 32px;
    font-weight: 600;
    margin: 32px 24px 24px;
}

.search-history-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    padding: 0 24px 24px;
    max-width: 1400px;
    margin: 0 auto;
}

.history-item {
    background: var(--card-background);
    border-radius: 16px;
    padding: 24px;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.search-term {
    color: var(--text-primary);
    font-size: 24px;
    font-weight: 600;
    margin: 0;
    text-transform: uppercase;
}

.search-date {
    color: var(--text-primary);
    font-size: 16px;
    opacity: 0.7;
}

.search-again-btn {
    background: var(--background-color);
    color: var(--text-primary);
    border: none;
    border-radius: 100px;
    padding: 16px 24px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    text-transform: uppercase;
    margin-top: auto;
}

.search-again-btn:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-2px);
}

/* Empty state */
.empty-history {
    text-align: center;
    padding: 48px 24px;
    color: var(--text-primary);
}

.empty-history h3 {
    font-size: 24px;
    margin-bottom: 12px;
}

.empty-history p {
    opacity: 0.7;
}

/* Responsive styles */
@media (max-width: 1200px) {
    .search-history-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .search-history-grid {
        grid-template-columns: 1fr;
        padding: 0 16px 16px;
    }

    .history-title {
        font-size: 24px;
        margin: 24px 16px 16px;
    }

    .history-item {
        padding: 20px;
    }

    .search-term {
        font-size: 20px;
    }
}

/* User Navigation Styles */
.user-nav {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 16px 24px;
    position: absolute;
    top: 0;
    right: 0;
}

.username {
    color: var(--text-primary);
    font-size: 16px;
    font-weight: 400;
    opacity: 0.9;
}

.logout-button {
    background: rgba(233, 30, 99, 0.1);
    color: #E91E63;
    text-decoration: none;
    padding: 6px 16px;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 500;
    transition: all 0.3s ease;
    border: 1px solid rgba(233, 30, 99, 0.2);
}

.logout-button:hover {
    background: rgba(233, 30, 99, 0.2);
    transform: translateY(-1px);
}

/* Responsive adjustments */
@media (max-width: 768px) {
    .user-nav {
        padding: 12px 16px;
    }
    
    .username {
        font-size: 14px;
    }
    
    .logout-button {
        padding: 4px 12px;
        font-size: 13px;
    }
}

/* Features Section Styles */
.features-section {
    display: flex;
    flex-direction: column;
    gap: 24px;
    padding: 32px;
    max-width: 800px;
    margin: 0 auto;
}

.feature-card {
    background: rgba(20, 22, 36, 0.7);
    border-radius: 24px;
    padding: 32px;
}

.feature-icon {
    font-size: 32px;
    margin-bottom: 24px;
    width: 48px;
    height: 48px;
    background: rgba(30, 33, 43, 0.8);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.feature-title {
    color: #FFFFFF;
    font-size: 32px;
    font-weight: 600;
    margin: 0 0 16px 0;
    line-height: 1.2;
}

.feature-description {
    color: rgba(255, 255, 255, 0.6);
    font-size: 20px;
    line-height: 1.5;
    margin: 0;
}

/* Card-specific backgrounds */
.feature-card:nth-child(1) {
    background: linear-gradient(145deg, rgba(20, 22, 36, 0.7), rgba(74, 125, 255, 0.1));
}

.feature-card:nth-child(2) {
    background: linear-gradient(145deg, rgba(20, 22, 36, 0.7), rgba(233, 30, 99, 0.1));
}

.feature-card:nth-child(3) {
    background: linear-gradient(145deg, rgba(20, 22, 36, 0.7), rgba(0, 200, 81, 0.1));
}

/* Responsive styles */
@media (max-width: 768px) {
    .features-section {
        padding: 16px;
    }

    .feature-card {
        padding: 24px;
    }

    .feature-title {
        font-size: 28px;
    }

    .feature-description {
        font-size: 18px;
    }

    .feature-icon {
        font-size: 28px;
        width: 40px;
        height: 40px;
    }
}

/* Main Navigation Styles */
.main-nav {
    background: rgba(30, 33, 43, 0.7);
    backdrop-filter: blur(10px);
    padding: 16px 24px;
    position: sticky;
    top: 0;
    z-index: 100;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.nav-links {
    display: flex;
    gap: 32px;
    max-width: 1200px;
    margin: 0 auto;
}

.nav-link {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    font-size: 16px;
    font-weight: 500;
    padding: 8px 16px;
    border-radius: 8px;
    transition: all 0.3s ease;
}

.nav-link:hover {
    color: #FFFFFF;
    background: rgba(255, 255, 255, 0.1);
}

.nav-link.active {
    color: #FFFFFF;
    background: rgba(233, 30, 99, 0.1);
    position: relative;
}

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 50%;
    transform: translateX(-50%);
    width: 24px;
    height: 2px;
    background: #E91E63;
    border-radius: 2px;
}

/* Responsive styles */
@media (max-width: 768px) {
    .main-nav {
        padding: 12px 16px;
    }

    .nav-links {
        gap: 16px;
        justify-content: center;
    }

    .nav-link {
        font-size: 14px;
        padding: 6px 12px;
    }
}

/* Make sure these styles work with your existing layout */
.container {
    padding-top: 24px;
}

/* Update feature cards to work with new navigation */
.features-section {
    margin-top: 32px;
}

/* Update other sections to maintain spacing */
.search-history-grid,
.saved-papers-grid {
    margin-top: 32px;
}

/* Back to Search Link */
.back-to-search {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--primary-color);
    text-decoration: none;
    padding: 0.5rem 1rem;
    border-radius: 8px;
    transition: all 0.3s ease;
    margin-bottom: 1.5rem;
    font-size: 0.95rem;
}

.back-to-search:hover {
    background: rgba(233, 30, 99, 0.1);
    transform: translateX(-2px);
}

/* Paper Title */
.paper-title {
    font-size: 1.8rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 1rem 0 2rem;
    line-height: 1.4;
}

/* Analysis and Chat Container */
.analysis-chat-container {
    background: linear-gradient(145deg, rgba(30, 27, 46, 0.95), rgba(19, 17, 28, 0.95));
    border-radius: 24px;
    border: 1px solid rgba(255, 255, 255, 0.08);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
    margin: 2rem auto;
    max-width: 1200px;
    overflow: hidden;
}

/* Enhanced Tab Navigation */
.analysis-tabs {
    display: flex;
    padding: 1.5rem 1.5rem 0;
    gap: 1rem;
    background: transparent;
}

.tab-button {
    background: rgba(19, 17, 28, 0.6);
    border: 1px solid rgba(255, 255, 255, 0.08);
    color: rgba(255, 255, 255, 0.7);
    padding: 1rem 2rem;
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    border-radius: 12px 12px 0 0;
    min-width: 160px;
}

.tab-button:hover {
    background: rgba(30, 27, 46, 0.8);
    color: rgba(255, 255, 255, 0.9);
}

.tab-button.active {
    background: linear-gradient(135deg, var(--primary-color), #f06292);
    color: white;
    border: none;
    box-shadow: 0 4px 15px rgba(233, 30, 99, 0.2);
}

/* Tab Content */
.tab-content {
    padding: 2rem;
    display: none;
    opacity: 0;
    transform: translateY(10px);
    transition: all 0.3s ease;
    background: rgba(19, 17, 28, 0.6);
    margin: 0 1.5rem 1.5rem;
    border-radius: 0 12px 12px 12px;
    border: 1px solid rgba(255, 255, 255, 0.08);
}

.tab-content.active {
    display: block;
    opacity: 1;
    transform: translateY(0);
    animation: fadeIn 0.4s ease;
}

/* Analysis Section Styles */
.analysis-section {
    margin-bottom: 2rem;
    background: rgba(30, 27, 46, 0.4);
    border-radius: 16px;
    padding: 1.8rem;
    border: 1px solid rgba(255, 255, 255, 0.05);
    transition: all 0.3s ease;
}

.analysis-section:hover {
    background: rgba(30, 27, 46, 0.6);
    transform: translateY(-2px);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
}

.analysis-section:last-child {
    margin-bottom: 0;
}

.analysis-section h3 {
    color: var(--primary-color);
    font-size: 1.3rem;
    margin-bottom: 1.2rem;
    display: flex;
    align-items: center;
    gap: 0.8rem;
    letter-spacing: 0.5px;
}

.analysis-section p {
    color: rgba(255, 255, 255, 0.9);
    line-height: 1.8;
    font-size: 1rem;
    margin: 0;
    letter-spacing: 0.2px;
}

/* Enhanced Chat Interface */
.chat-container {
    height: 600px;
    display: flex;
    flex-direction: column;
    background: transparent;
}

.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 1.2rem;
}

.message {
    max-width: 85%;
    padding: 1.2rem 1.5rem;
    border-radius: 16px;
    line-height: 1.6;
    font-size: 0.95rem;
    letter-spacing: 0.2px;
}

.user-message {
    background: linear-gradient(135deg, var(--primary-color), #f06292);
    color: white;
    align-self: flex-end;
    border-bottom-right-radius: 4px;
    box-shadow: 0 4px 15px rgba(233, 30, 99, 0.2);
}

.ai-message {
    background: rgba(30, 27, 46, 0.6);
    color: rgba(255, 255, 255, 0.95);
    align-self: flex-start;
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-bottom-left-radius: 4px;
}

.chat-input-area {
    padding: 1.5rem;
    background: rgba(19, 17, 28, 0.4);
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    display: flex;
    gap: 1rem;
    align-items: center;
}

.chat-input {
    flex: 1;
    background: rgba(30, 27, 46, 0.95);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 12px;
    padding: 1rem 1.2rem;
    color: white;
    font-size: 0.95rem;
    transition: all 0.3s ease;
}

.chat-input:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(233, 30, 99, 0.1);
    background: rgba(30, 27, 46, 0.8);
    outline: none;
}

.chat-send-button {
    background: linear-gradient(135deg, #E91E63, #f06292);
    color: white;
    border: none;
    padding: 1rem 1.8rem;
    border-radius: 12px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    text-transform: uppercase;
    letter-spacing: 1px;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-family: 'Space Grotesk', sans-serif;
    box-shadow: 0 4px 15px rgba(233, 30, 99, 0.2);
}

.chat-send-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(233, 30, 99, 0.3);
}

.chat-send-button:active {
    transform: translateY(0);
}

/* Quick Questions Section */
.quick-questions {
    padding: 1rem 1.5rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    display: flex;
    gap: 0.8rem;
    flex-wrap: wrap;
}

.quick-question-btn {
    background: rgba(30, 27, 46, 0.6);
    border: 1px solid rgba(255, 255, 255, 0.08);
    color: rgba(255, 255, 255, 0.9);
    padding: 0.8rem 1.2rem;
    border-radius: 20px;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.3s ease;
    white-space: nowrap;
}

.quick-question-btn:hover {
    background: rgba(233, 30, 99, 0.1);
    border-color: rgba(233, 30, 99, 0.3);
    color: #E91E63;
    transform: translateY(-1px);
}

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

/* AI Thinking Indicator */
.thinking-indicator {
    opacity: 0.7;
    transition: all 0.3s ease;
}

.ai-thinking {
    display: flex;
    align-items: center;
    padding: 0.8rem 1.2rem;
    background: rgba(30, 27, 46, 0.4);
    border-radius: 12px;
    min-width: 80px;
}

.ai-thinking-dots {
    display: flex;
    gap: 4px;
    justify-content: center;
    align-items: center;
    height: 24px;
}

.ai-thinking-dot {
    width: 6px;
    height: 6px;
    background: var(--primary-color);
    border-radius: 50%;
    animation: thinking 1.4s infinite ease-in-out;
    opacity: 0.7;
}

/* Smoother animation for dots */
@keyframes thinking {
    0%, 80%, 100% { 
        transform: scale(0.6);
        opacity: 0.3;
    }
    40% { 
        transform: scale(1);
        opacity: 0.8;
    }
}