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

body {
    font-family: 'Roboto', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: linear-gradient(135deg, #0f1f3c 0%, #1a2847 50%, #243459 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    line-height: 1.6;
    color: #ffffff;
}

.container {
    background: rgba(255, 255, 255, 0.08);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 215, 0, 0.2);
    border-radius: 24px;
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.3), 0 0 0 1px rgba(255, 215, 0, 0.1);
    padding: 50px;
    max-width: 900px;
    width: 100%;
    animation: slideIn 0.8s ease-out;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(40px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

header {
    text-align: center;
    margin-bottom: 50px;
}

h1 {
    color: #ffd700;
    font-size: 2.8rem;
    font-weight: 700;
    background: linear-gradient(45deg, #ffd700, #ffed4e);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 15px;
    text-shadow: 0 2px 10px rgba(255, 215, 0, 0.3);
}

.subtitle {
    color: #b8c6db;
    font-size: 1.2rem;
    font-weight: 400;
    margin-bottom: 0;
}

.upload-area {
    border: 3px dashed #ffd700;
    border-radius: 20px;
    padding: 60px 30px;
    text-align: center;
    margin-bottom: 40px;
    transition: all 0.4s ease;
    background: rgba(255, 215, 0, 0.08);
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.upload-area::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 215, 0, 0.1), transparent);
    transition: left 0.6s;
}

.upload-area:hover::before {
    left: 100%;
}

.upload-area:hover {
    border-color: #ffed4e;
    background: rgba(255, 215, 0, 0.12);
    transform: translateY(-3px);
    box-shadow: 0 10px 30px rgba(255, 215, 0, 0.2);
}

.upload-area.dragover {
    border-color: #ffed4e;
    background: rgba(255, 215, 0, 0.15);
    transform: scale(1.02);
    box-shadow: 0 15px 40px rgba(255, 215, 0, 0.3);
}

.upload-icon {
    font-size: 4.5rem;
    color: #ffd700;
    margin-bottom: 25px;
    transition: all 0.4s ease;
    filter: drop-shadow(0 4px 8px rgba(255, 215, 0, 0.3));
}

.upload-area:hover .upload-icon {
    transform: scale(1.15) rotate(5deg);
    color: #ffed4e;
}

.upload-text {
    color: #ffffff;
    font-size: 1.3rem;
    margin-bottom: 15px;
    font-weight: 500;
}

.upload-subtext {
    color: #b8c6db;
    font-size: 1rem;
    margin-bottom: 20px;
}

.file-input {
    display: none;
}

#fileInput {
    display: none;
}

.btn, .process-btn {
    background: linear-gradient(45deg, #ffd700, #ffed4e);
    color: #0f1f3c;
    border: none;
    padding: 16px 40px;
    border-radius: 30px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.4s ease;
    display: inline-block;
    margin: 10px auto;
    box-shadow: 0 8px 25px rgba(255, 215, 0, 0.4);
    font-family: 'Roboto', sans-serif;
    position: relative;
    overflow: hidden;
}

.process-btn {
    display: block;
    margin: 30px auto;
}

.btn::before, .process-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.6s;
}

.btn:hover::before, .process-btn:hover::before {
    left: 100%;
}

.btn:hover, .process-btn:hover:not(:disabled) {
    transform: translateY(-3px);
    box-shadow: 0 12px 35px rgba(255, 215, 0, 0.5);
    background: linear-gradient(45deg, #ffed4e, #ffd700);
}

.btn:disabled, .process-btn:disabled {
    background: rgba(255, 255, 255, 0.2);
    color: rgba(255, 255, 255, 0.5);
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

.file-info {
    background: rgba(255, 215, 0, 0.1);
    padding: 25px;
    border-radius: 15px;
    margin-bottom: 30px;
    display: none;
    border-left: 5px solid #ffd700;
    backdrop-filter: blur(10px);
}

.file-name {
    font-weight: 600;
    color: #ffd700;
    margin-bottom: 10px;
    font-size: 1.2rem;
}

.file-size {
    color: #b8c6db;
    font-size: 1rem;
}

.status {
    text-align: center;
    margin: 30px 0;
    padding: 20px;
    border-radius: 15px;
    display: none;
    font-weight: 500;
    font-size: 1.1rem;
    backdrop-filter: blur(10px);
}

.status.success {
    background: rgba(76, 175, 80, 0.15);
    color: #81c784;
    border: 1px solid rgba(76, 175, 80, 0.3);
    box-shadow: 0 8px 25px rgba(76, 175, 80, 0.2);
}

.status.error {
    background: rgba(244, 67, 54, 0.15);
    color: #ef5350;
    border: 1px solid rgba(244, 67, 54, 0.3);
    box-shadow: 0 8px 25px rgba(244, 67, 54, 0.2);
}

.status.info, .status.processing {
    background: rgba(255, 215, 0, 0.15);
    color: #ffd700;
    border: 1px solid rgba(255, 215, 0, 0.3);
    box-shadow: 0 8px 25px rgba(255, 215, 0, 0.2);
}

.loading, .spinner {
    border: 4px solid rgba(255, 255, 255, 0.3);
    border-top: 4px solid #ffd700;
    border-radius: 50%;
    width: 35px;
    height: 35px;
    animation: spin 1s linear infinite;
    margin: 0 auto 20px;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.preview, .preview-section {
    margin-top: 40px;
    display: none;
}

.preview-title {
    font-size: 1.4rem;
    color: #ffd700;
    margin-bottom: 20px;
    font-weight: 600;
}

.preview h3 {
    color: #ffd700;
    margin-bottom: 15px;
    font-weight: 600;
}

.preview-content, #previewContent {
    background: rgba(255, 255, 255, 0.05);
    padding: 25px;
    border-radius: 15px;
    border-left: 5px solid #ffd700;
    max-height: 350px;
    overflow-y: auto;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 215, 0, 0.2);
}

.preview ul {
    margin-left: 25px;
    color: #b8c6db;
}

.preview li {
    margin: 8px 0;
    color: #b8c6db;
}

.preview-item {
    margin-bottom: 15px;
    padding: 15px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 10px;
    border-left: 4px solid #ffd700;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

.preview-item strong {
    color: #ffd700;
}

.download-btn {
    background: linear-gradient(45deg, #4caf50, #66bb6a);
    color: white;
    border: none;
    padding: 14px 35px;
    border-radius: 30px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.4s ease;
    margin-top: 25px;
    box-shadow: 0 8px 25px rgba(76, 175, 80, 0.4);
    font-family: 'Roboto', sans-serif;
    position: relative;
    overflow: hidden;
}

.download-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.6s;
}

.download-btn:hover::before {
    left: 100%;
}

.download-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 35px rgba(76, 175, 80, 0.5);
    background: linear-gradient(45deg, #66bb6a, #4caf50);
}

footer {
    margin-top: 60px;
    padding-top: 40px;
    border-top: 1px solid rgba(255, 215, 0, 0.2);
}

.features {
    margin-bottom: 40px;
}

.features h3 {
    color: #ffd700;
    margin-bottom: 20px;
    font-size: 1.3rem;
    font-weight: 600;
}

.features ul {
    list-style: none;
    padding: 0;
}

.features li {
    margin-bottom: 12px;
    color: #b8c6db;
    font-size: 1rem;
    padding-left: 8px;
}

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

.github-link a {
    display: inline-block;
    background: linear-gradient(45deg, #1a2332, #2c3e50);
    color: #ffd700;
    text-decoration: none;
    padding: 15px 30px;
    border-radius: 30px;
    font-weight: 600;
    transition: all 0.4s ease;
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.3);
    border: 1px solid rgba(255, 215, 0, 0.2);
    position: relative;
    overflow: hidden;
}

.github-link a::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 215, 0, 0.1), transparent);
    transition: left 0.6s;
}

.github-link a:hover::before {
    left: 100%;
}

.github-link a:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 35px rgba(0, 0, 0, 0.4);
    color: #ffed4e;
    border-color: rgba(255, 215, 0, 0.4);
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 30px 20px;
        margin: 10px;
    }
    
    h1 {
        font-size: 2.2rem;
    }
    
    .subtitle {
        font-size: 1.1rem;
    }
    
    .upload-area {
        padding: 40px 20px;
    }
    
    .upload-icon {
        font-size: 3.5rem;
    }
    
    .upload-text {
        font-size: 1.1rem;
    }
    
    .btn, .process-btn {
        padding: 14px 30px;
        font-size: 1rem;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 25px 15px;
    }
    
    h1 {
        font-size: 1.9rem;
    }
    
    .subtitle {
        font-size: 1rem;
    }
    
    .upload-area {
        padding: 35px 15px;
    }
    
    .upload-icon {
        font-size: 3rem;
    }
    
    .upload-text {
        font-size: 1rem;
    }
    
    .btn, .process-btn, .download-btn {
        padding: 12px 25px;
        font-size: 0.95rem;
    }
    
    .file-info, .status, .preview-content {
        padding: 20px;
    }
}

/* Scrollbar Styling */
.preview-content::-webkit-scrollbar, #previewContent::-webkit-scrollbar {
    width: 10px;
}

.preview-content::-webkit-scrollbar-track, #previewContent::-webkit-scrollbar-track {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 10px;
}

.preview-content::-webkit-scrollbar-thumb, #previewContent::-webkit-scrollbar-thumb {
    background: rgba(255, 215, 0, 0.5);
    border-radius: 10px;
}

.preview-content::-webkit-scrollbar-thumb:hover, #previewContent::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 215, 0, 0.7);
}

/* Animation for better UX */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.file-info, .status, .preview-section {
    animation: fadeInUp 0.5s ease-out;
}

/* Enhanced button hover effects */
.btn:active, .process-btn:active, .download-btn:active {
    transform: translateY(-1px);
    transition: transform 0.1s;
}

/* Glassmorphism enhancement */
.container::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(45deg, rgba(255, 215, 0, 0.05), transparent, rgba(255, 215, 0, 0.05));
    border-radius: 24px;
    pointer-events: none;
}