body {
    margin: 0;
    padding: 0;
    font-family: 'Times New Roman', Times, serif;
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    color: #2d3748;
    line-height: 1.6;
    min-height: 100vh;
}


.header {
    background: linear-gradient(135deg, #faf7f0 0%, #efe7d6 50%, #e2d6bd 100%);
    color: #1f2933;
    padding: 50px 20px 40px;
    text-align: center;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
    border-bottom: 1px solid #d6c08a;
    position: relative;
    overflow: hidden;
}

.header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, #e6d3a3, #f3e6c6, #e6d3a3);
}

.header h1 {
    margin: 0 0 25px 0;
    font-family: 'Times New Roman', Times, serif;
    font-size: 2.6rem;
    font-weight: 700;
    line-height: 1.2;
}

.authors {
    font-family: 'Times New Roman', Times, serif;
    font-size: 1.4rem;
    font-weight: 600;
    margin: 0 0 15px 0;
    color: #374151;
}

.affiliations {
    font-family: 'Times New Roman', Times, serif;
    font-size: 1.2rem;
    color: #6b7280;
    line-height: 1.5;
}

.authors sup, .affiliations sup {
    font-size: 0.8em;
    color: #d97706;
    font-weight: 600;
}


.btn-container {
    text-align: center;
    padding: 25px 20px;
    background: rgba(255, 255, 255, 0.6);
    backdrop-filter: blur(10px);
    margin: 0 auto;
    max-width: 500px;
    border-radius: 12px;
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.08);
}

.btn {
    background: linear-gradient(135deg, #f59e0b 0%, #eab308 100%);
    color: white;
    padding: 12px 28px;
    text-align: center;
    text-decoration: none;
    display: inline-block;
    font-size: 18px;
    font-weight: 600;
    margin: 6px 10px;
    cursor: pointer;
    border-radius: 10px;
    border: none;
    transition: all 0.3s ease;
    box-shadow: 0 4px 12px rgba(245, 158, 11, 0.3);
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(245, 158, 11, 0.4);
}


.narrow-container {
    max-width: 1400px;
    margin: 30px auto;
    padding: 30px;
    text-align: center;
    background: rgba(255, 255, 255, 0.95);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.08);
    border-radius: 16px;
    border: 1px solid rgba(255, 255, 255, 0.2);
}

html {
    scroll-behavior: smooth;
}

/* Abstract Section */
.abstract-section h2 {
    font-family: 'Times New Roman', Times, serif;
    font-size: 2rem;
    color: #1e293b;
    margin-bottom: 25px;
    text-align: center;
    border-bottom: 2px solid #f59e0b;
    padding-bottom: 10px;
}

.abstract-text {
    font-family: 'Times New Roman', Times, serif;
    font-size: 1.2rem;
    line-height: 1.7;
    color: #4b5563;
    margin-bottom: 30px;
    text-align: justify;
}

.abstract-text p {
    margin-bottom: 18px;
    text-indent: 2em;
}

.abstract-text p:first-child {
    text-indent: 0;
}

.framework-image {
    text-align: center;
    margin-top: 30px;
}

.framework-image img {
    width: 50%;
    max-width: 1200px;
    height: auto;
    border: 1px solid #e5e7eb;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

.image-caption {
    font-family: 'Times New Roman', Times, serif;
    font-size: 1.2rem;
    color: #6b7280;
    margin-top: 12px;
    font-style: italic;
    text-align: center;
}

/* Refernce Title */
.ref-title {
    font-family: 'Times New Roman', Times, serif;
    font-size: 1.7rem;
    font-weight: 600;
    color: #1e293b;
    margin-bottom: 0;
    text-align: left;
    border-bottom: none;
    padding-left: 10px;
    padding-bottom: 0;
}

/* Section Title */
.section-title {
    font-family: 'Times New Roman', Times, serif;
    font-size: 2rem;
    font-weight: 600;
    color: #1e293b;
    margin-bottom: 25px;
    text-align: center;
    border-bottom: 2px solid #08f385;
    padding-bottom: 10px;
}

.section-description {
    font-size: 18px;
    color: #444;
    padding-left: 12px;
    margin-left: 4px;
    line-height: 1.6;
    text-align: left;
    background-color: #fff8f8;
    border-left: 4px solid #888;
}

.file-section {
    margin-bottom: 10px;
    background: white;
    border-radius: 12px;
    padding: 25px;
    box-shadow: 0 6px 25px rgba(0, 0, 0, 0.06);
    border: 1px solid #f1f5f9;
}

.file-header {
    text-align: left;
    margin-bottom: 20px;
}

.file-title {
    font-family: 'Times New Roman', Times, serif;
    font-size: 1.2rem;
    font-weight: normal;
    color: #1e293b;
    padding: 0;
    /* border-radius: 10px; */
    display: inline-block;
    /* border: 1px solid #fbbf24; */
    border: none; 
}


.audio-grid-c5 {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 25px;
    margin-bottom: 12px;
}

.audio-grid-c4 {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 25px;
    margin-bottom: 12px;
}

.audio-grid-c3 {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 25px;
    margin-bottom: 12px;
}

.audio-grid-c2 {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 25px;
    margin-bottom: 10px;
}

.audio-card {
    background: linear-gradient(135deg, #f8fafc 0%, #f1f5f9 100%);
    border-radius: 10px;
    padding: 20px;
    text-align: center;
    border: 1px solid #e2e8f0;
    transition: all 0.3s ease;
    box-shadow: 0 3px 15px rgba(0, 0, 0, 0.05);
}

.audio-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
    border-color: #f59e0b;
}

.audio-card.highlight {
    border: 0.16rem solid;
    border-color: #08f385;
}

.card-title {
    font-size: 18px;
    font-weight: 600;
    color: #475569;
    margin-bottom: 15px;
    padding-bottom: 10px;
    border-bottom: 1px solid #e2e8f0;
}

.card-image {
    margin-bottom: 15px;
}

.card-image img {
    width: 100%;
    max-width: 380px;
    height: auto;
    border: 1px solid #d1d5db;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    transition: transform 0.3s ease;
}

.card-image-large {
    margin-bottom: 15px;
}

.card-image-large img {
    width: 100%;
    max-width: 600px;
    height: auto;
    border: 1px solid #d1d5db;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    transition: transform 0.3s ease;
}

.audio-card:hover .card-image img {
    transform: scale(1.01);
}

.card-audio {
    margin-top: 12px;
}

.card-audio audio {
    width: 100%;
    border-radius: 20px;
    outline: none;
}

.card-audio audio::-webkit-media-controls-panel {
    background: linear-gradient(135deg, #ffffff 0%, #f8fafc 100%);
    border-radius: 20px;
}


.citation {
    text-align: left;
    margin-top: 5px;
    padding: 10px;
    background: linear-gradient(135deg, #f8fafc 0%, #f1f5f9 100%);
    border-left: 4px solid #08f385;
    border-radius: 10px;
    font-size: 0.9rem;
    color: #475569;
    line-height: 1.6;
}

.citation p {
    margin: 0;
}


@media (max-width: 1200px) {
    .header h1 {
        font-size: 2.2rem;
    }
    
    .narrow-container {
        margin: 20px;
        padding: 25px;
    }
    
    .audio-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 20px;
    }
}

@media (max-width: 768px) {
    .header {
        padding: 40px 20px 30px;
    }
    
    .header h1 {
        font-size: 1.8rem;
    }

    .authors {
        font-size: 1.2rem;
    }

    .affiliations {
        font-size: 1rem;
    }

    .file-section {
        padding: 20px;
        margin-bottom: 30px;
    }

    .file-title {
        font-size: 20px;
        padding: 12px 25px;
    }

    .audio-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .btn {
        padding: 10px 20px;
        margin: 5px;
        display: block;
        width: 180px;
        margin-left: auto;
        margin-right: auto;
    }
    
    .abstract-section h2,
    .section-title {
        font-size: 1.6rem;
    }
    
    .abstract-text {
        font-size: 1rem;
        text-align: left;
    }
    
    .abstract-text p {
        text-indent: 1.5em;
    }
}

@media (max-width: 480px) {
    .header h1 {
        font-size: 1.5rem;
    }
    
    .narrow-container {
        margin: 10px;
        padding: 20px;
    }
    
    .file-section {
        padding: 15px;
    }
    
    .file-title {
        font-size: 18px;
        padding: 10px 20px;
    }
    
    .audio-card {
        padding: 15px;
    }
    
    .card-image img {
        max-width: 100%;
    }
}

::-webkit-scrollbar {
    width: 6px;
}

::-webkit-scrollbar-track {
    background: #f1f5f9;
}

::-webkit-scrollbar-thumb {
    background: #cbd5e1;
    border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
    background: #94a3b8;
}