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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: #2d3748;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header Styles */
.header {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.2);
    padding: 60px 0;
    text-align: center;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
}

.header-content {
    max-width: 800px;
    margin: 0 auto;
}

.title {
    font-size: 3rem;
    font-weight: 700;
    background: linear-gradient(135deg, #667eea, #764ba2);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 20px;
    line-height: 1.2;
}

.subtitle {
    font-size: 1.3rem;
    color: #4a5568;
    margin-bottom: 30px;
    font-weight: 400;
}

.paper-info {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 20px;
    flex-wrap: wrap;
}

.conference {
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
    padding: 8px 20px;
    border-radius: 25px;
    font-weight: 600;
    font-size: 0.9rem;
}

.paper-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: #667eea;
    text-decoration: none;
    font-weight: 500;
    padding: 8px 20px;
    border: 2px solid #667eea;
    border-radius: 25px;
    transition: all 0.3s ease;
}

.paper-link:hover {
    background: #667eea;
    color: white;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.3);
}

/* Navigation Styles */
.nav {
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    padding: 20px 0;
    position: sticky;
    top: 0;
    z-index: 100;
    border-bottom: 1px solid rgba(255, 255, 255, 0.2);
}

.nav-links {
    display: flex;
    justify-content: center;
    list-style: none;
    gap: 40px;
}

.nav-link {
    color: #4a5568;
    text-decoration: none;
    font-weight: 500;
    padding: 10px 20px;
    border-radius: 8px;
    transition: all 0.3s ease;
    position: relative;
}

.nav-link:hover,
.nav-link.active {
    color: #667eea;
    background: rgba(102, 126, 234, 0.1);
}

/* Main Content */
.main {
    background: white;
    margin-top: 40px;
    border-radius: 20px 20px 0 0;
    box-shadow: 0 -10px 40px rgba(0, 0, 0, 0.1);
    overflow: hidden;
}

.section {
    padding: 80px 0;
}

.section:not(:last-child) {
    border-bottom: 1px solid #e2e8f0;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 60px;
    color: #2d3748;
    position: relative;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 4px;
    background: linear-gradient(135deg, #667eea, #764ba2);
    border-radius: 2px;
}

/* Overview Section */
.overview-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 40px;
    margin-top: 60px;
}

.overview-card {
    background: white;
    padding: 40px 30px;
    border-radius: 16px;
    text-align: center;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
    border: 1px solid #f7fafc;
}

.overview-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
}

.card-icon {
    font-size: 3rem;
    background: linear-gradient(135deg, #667eea, #764ba2);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 20px;
}

.overview-card h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 15px;
    color: #2d3748;
}

.overview-card p {
    color: #4a5568;
    line-height: 1.7;
}

/* Architecture Section */
.architecture-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    margin-top: 40px;
}

.architecture-description h3 {
    font-size: 1.8rem;
    font-weight: 600;
    margin-bottom: 30px;
    color: #2d3748;
}

.pipeline-intro {
    font-size: 1.1rem;
    color: #4a5568;
    margin-bottom: 25px;
    line-height: 1.6;
}

.pipeline-steps {
    list-style: none;
    counter-reset: step-counter;
}

.pipeline-steps li {
    counter-increment: step-counter;
    padding: 20px 0;
    padding-left: 60px;
    position: relative;
    border-left: 2px solid #e2e8f0;
    margin-left: 20px;
}

.pipeline-steps li::before {
    content: counter(step-counter);
    position: absolute;
    left: -25px;
    top: 15px;
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 0.9rem;
}

.pipeline-steps li:last-child {
    border-left: none;
}

.architecture-image {
    display: flex;
    justify-content: center;
}

.architecture-diagram {
    max-width: 100%;
    height: auto;
    border-radius: 12px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    border: 1px solid #e2e8f0;
}

/* Preprocessing Section */
.preprocessing-section {
    margin-top: 80px;
    padding-top: 60px;
    border-top: 1px solid #e2e8f0;
}

.preprocessing-section h3 {
    font-size: 1.8rem;
    font-weight: 600;
    margin-bottom: 40px;
    color: #2d3748;
    text-align: center;
}

.preprocessing-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.preprocessing-image {
    display: flex;
    justify-content: center;
}

.preprocessing-diagram {
    max-width: 100%;
    height: auto;
    border-radius: 12px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    border: 1px solid #e2e8f0;
}

.preprocessing-description p {
    font-size: 1.1rem;
    color: #4a5568;
    margin-bottom: 25px;
    line-height: 1.6;
}

.preprocessing-steps {
    list-style: none;
    padding-left: 0;
}

.preprocessing-steps li {
    padding: 12px 0;
    padding-left: 30px;
    position: relative;
    color: #4a5568;
    line-height: 1.6;
}

.preprocessing-steps li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: #667eea;
    font-weight: bold;
    font-size: 1.2rem;
}

.image-placeholder {
    width: 100%;
    max-width: 400px;
    height: 300px;
    background: linear-gradient(135deg, #f7fafc, #edf2f7);
    border: 2px dashed #cbd5e0;
    border-radius: 16px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: #718096;
}

.image-placeholder i {
    font-size: 3rem;
    margin-bottom: 15px;
    opacity: 0.5;
}

.image-placeholder p {
    font-weight: 500;
    margin-bottom: 5px;
}

.image-placeholder small {
    font-size: 0.8rem;
    opacity: 0.7;
}

/* Demo Section */
.demo-description {
    text-align: center;
    font-size: 1.1rem;
    color: #4a5568;
    max-width: 800px;
    margin: 0 auto 60px;
    line-height: 1.7;
}

.demo-grid {
    display: flex;
    flex-direction: column;
    gap: 50px;
}

.demo-pair {
    background: #f8fafc;
    border-radius: 16px;
    padding: 40px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
    border: 1px solid #e2e8f0;
}

.demo-header {
    text-align: center;
    margin-bottom: 30px;
}

.demo-header h3 {
    font-size: 1.5rem;
    font-weight: 600;
    color: #2d3748;
    margin-bottom: 15px;
}

.text-sample {
    background: white;
    padding: 20px;
    border-radius: 12px;
    font-style: italic;
    color: #4a5568;
    border-left: 4px solid #667eea;
    margin: 0 auto;
    max-width: 800px;
}

/* SSML Comparison Styles */
.ssml-comparison {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
    margin: 30px 0;
}

.ssml-item {
    background: white;
    padding: 25px;
    border-radius: 12px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
    transition: all 0.3s ease;
}

.ssml-item:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

.ssml-item.baseline-ssml {
    border-top: 4px solid #e53e3e;
}

.ssml-item.enhanced-ssml {
    border-top: 4px solid #38a169;
}

.ssml-item h4 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 15px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.ssml-item.baseline-ssml h4 {
    color: #e53e3e;
}

.ssml-item.enhanced-ssml h4 {
    color: #38a169;
}

.ssml-code {
    background: #f7fafc;
    border: 1px solid #e2e8f0;
    border-radius: 8px;
    padding: 15px;
    font-family: 'Courier New', monospace;
    font-size: 0.85rem;
    line-height: 1.5;
    color: #2d3748;
    overflow-x: auto;
    white-space: pre-wrap;
    word-break: break-word;
    margin-bottom: 10px;
}

.baseline-ssml .ssml-code {
    background: #fef5e7;
    border-color: #fed7aa;
}

.enhanced-ssml .ssml-code {
    background: #f0fff4;
    border-color: #9ae6b4;
}

.ssml-description {
    font-size: 0.85rem;
    color: #718096;
    line-height: 1.4;
}

.audio-comparison {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
}

.audio-item {
    background: white;
    padding: 30px;
    border-radius: 12px;
    text-align: center;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
    transition: all 0.3s ease;
}

.audio-item:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
}

.audio-item.baseline {
    border-top: 4px solid #e53e3e;
}

.audio-item.enhanced {
    border-top: 4px solid #38a169;
}

.audio-item h4 {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}

.audio-item.baseline h4 {
    color: #e53e3e;
}

.audio-item.enhanced h4 {
    color: #38a169;
}

.audio-item audio {
    width: 100%;
    margin-bottom: 15px;
    border-radius: 8px;
}

.audio-description {
    font-size: 0.9rem;
    color: #718096;
    line-height: 1.5;
}

/* Technical Details */
.technical-details {
    margin-top: 80px;
    padding: 60px 40px;
    background: linear-gradient(135deg, #667eea, #764ba2);
    border-radius: 16px;
    color: white;
}

.technical-details h3 {
    font-size: 2rem;
    font-weight: 600;
    text-align: center;
    margin-bottom: 40px;
}

.details-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 40px;
}

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

.detail-item h4 {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 15px;
    color: rgba(255, 255, 255, 0.95);
}

.detail-item p {
    line-height: 1.6;
    color: rgba(255, 255, 255, 0.8);
}

/* Footer */
.footer {
    background: #2d3748;
    color: white;
    padding: 50px 0;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    flex-wrap: wrap;
    gap: 30px;
}

.footer-main {
    flex: 1;
    max-width: 800px;
}

.authors {
    font-size: 1.1rem;
    margin-bottom: 15px;
    line-height: 1.6;
}

.author-highlight {
    color: white;
    text-decoration: none;
    font-weight: 600;
    transition: color 0.3s ease;
}

.author-highlight:hover {
    color: #764ba2;
    text-decoration: underline;
}

.affiliations {
    font-size: 0.95rem;
    color: #a0aec0;
    margin-bottom: 15px;
    line-height: 1.5;
}

.copyright {
    font-size: 0.9rem;
    color: #a0aec0;
}

.footer-links {
    display: flex;
    flex-direction: column;
    gap: 15px;
    align-items: flex-end;
}

.footer-link {
    color: #a0aec0;
    text-decoration: none;
    transition: color 0.3s ease;
    font-weight: 500;
}

.footer-link:hover {
    color: white;
}

/* Responsive Design */
@media (max-width: 768px) {
    .title {
        font-size: 2.2rem;
    }
    
    .subtitle {
        font-size: 1.1rem;
    }
    
    .nav-links {
        gap: 20px;
    }
    
    .nav-link {
        padding: 8px 15px;
        font-size: 0.9rem;
    }
    
    .section {
        padding: 60px 0;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .overview-grid {
        grid-template-columns: 1fr;
        gap: 30px;
    }
    
    .architecture-container,
    .preprocessing-container {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .audio-comparison,
    .ssml-comparison {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .demo-pair {
        padding: 30px 20px;
    }
    
    .details-grid {
        grid-template-columns: 1fr;
        gap: 30px;
    }
    
    .footer-content {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }
    
    .footer-links {
        flex-direction: row;
        align-items: center;
        gap: 20px;
    }
    
    .ssml-code {
        font-size: 0.75rem;
        padding: 12px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }
    
    .title {
        font-size: 1.8rem;
    }
    
    .nav-links {
        flex-direction: column;
        gap: 10px;
    }
    
    .paper-info {
        flex-direction: column;
        gap: 15px;
    }
}

/* Smooth Scrolling */
html {
    scroll-behavior: smooth;
}

/* Loading Animation for Audio */
audio::-webkit-media-controls-panel {
    background-color: #f7fafc;
}

/* Custom Audio Player Styling */
audio {
    outline: none;
    border: 1px solid #e2e8f0;
}

audio::-webkit-media-controls-play-button {
    background-color: #667eea;
    border-radius: 50%;
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    
    html {
        scroll-behavior: auto;
    }
}

/* Focus States for Accessibility */
.nav-link:focus,
.paper-link:focus,
.footer-link:focus {
    outline: 2px solid #667eea;
    outline-offset: 2px;
}

audio:focus {
    outline: 2px solid #667eea;
    outline-offset: 2px;
}