:root {
    --primary-color: #4361ee;
    --primary-dark: #3a56d4;
    --secondary-color: #3f37c9;
    --accent-color: #4895ef;
    --light-color: #f8f9fa;
    --dark-color: #212529;
    --gray-color: #6c757d;
    --light-gray: #e9ecef;
    --success-color: #4bb543;
    --error-color: #ff3333;
    --border-radius: 8px;
    --box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
}

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

body {
    font-family: 'Poppins', sans-serif;
    background-color: #f5f7ff;
    color: var(--dark-color);
    line-height: 1.6;
}

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

header {
    text-align: center;
    margin-bottom: 2rem;
}

header h1 {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

header .subtitle {
    color: var(--gray-color);
    font-size: 1.1rem;
}

.upload-area {
    background-color: white;
    border-radius: var(--border-radius);
    padding: 3rem 2rem;
    text-align: center;
    margin-bottom: 2rem;
    box-shadow: var(--box-shadow);
    border: 2px dashed var(--light-gray);
    transition: var(--transition);
    cursor: pointer;
}

.upload-area:hover {
    border-color: var(--primary-color);
}

.upload-area.drag-over {
    border-color: var(--primary-color);
    background-color: rgba(67, 97, 238, 0.05);
}

.upload-content i {
    font-size: 3rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.upload-content h3 {
    margin-bottom: 0.5rem;
    color: var(--dark-color);
}

.upload-content p {
    color: var(--gray-color);
    margin-bottom: 1rem;
}

.file-types {
    font-size: 0.9rem;
    margin-top: 1rem;
    color: var(--gray-color);
}

.btn-primary {
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 0.8rem 1.5rem;
    border-radius: var(--border-radius);
    font-size: 1rem;
    cursor: pointer;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.btn-primary:hover {
    background-color: var(--primary-dark);
    transform: translateY(-2px);
}

.btn-primary:disabled {
    background-color: var(--gray-color);
    cursor: not-allowed;
    transform: none;
}

.btn-secondary {
    background-color: white;
    color: var(--primary-color);
    border: 1px solid var(--primary-color);
    padding: 0.8rem 1.5rem;
    border-radius: var(--border-radius);
    font-size: 1rem;
    cursor: pointer;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.btn-secondary:hover {
    background-color: var(--light-gray);
    transform: translateY(-2px);
}

.settings-panel {
    background-color: white;
    border-radius: var(--border-radius);
    padding: 2rem;
    margin-bottom: 2rem;
    box-shadow: var(--box-shadow);
    display: none;
}

.file-info {
    margin-bottom: 2rem;
}

.thumbnail-container {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

#videoThumbnail {
    width: 120px;
    height: 80px;
    object-fit: cover;
    border-radius: 4px;
    background-color: var(--light-gray);
    display: none;
}

.video-info h4 {
    margin-bottom: 0.5rem;
    color: var(--dark-color);
}

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

.conversion-settings {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.setting-group {
    margin-bottom: 1rem;
}

.setting-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--dark-color);
}

.form-control {
    width: 100%;
    padding: 0.8rem;
    border: 1px solid var(--light-gray);
    border-radius: var(--border-radius);
    font-family: inherit;
    font-size: 1rem;
    transition: var(--transition);
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(67, 97, 238, 0.2);
}

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

.form-checkbox {
    width: 18px;
    height: 18px;
    accent-color: var(--primary-color);
    cursor: pointer;
}

.trim-options {
    margin-top: 1rem;
    padding: 1rem;
    background-color: var(--light-gray);
    border-radius: var(--border-radius);
}

.time-inputs {
    display: flex;
    gap: 1rem;
}

.time-inputs > div {
    flex: 1;
}

.time-inputs input {
    width: 100%;
    padding: 0.5rem;
    border: 1px solid #ddd;
    border-radius: 4px;
}

.action-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
}

.progress-container {
    background-color: white;
    border-radius: var(--border-radius);
    padding: 2rem;
    margin-bottom: 2rem;
    box-shadow: var(--box-shadow);
}

.progress-info {
    display: flex;
    justify-content: space-between;
    margin-bottom: 1rem;
}

.progress-bar {
    height: 10px;
    background-color: var(--light-gray);
    border-radius: 5px;
    overflow: hidden;
    margin-bottom: 0.5rem;
}

.progress-fill {
    height: 100%;
    width: 0%;
    background-color: var(--primary-color);
    border-radius: 5px;
    transition: width 0.3s ease;
}

.time-remaining {
    text-align: center;
    color: var(--gray-color);
    font-size: 0.9rem;
}

.result-container {
    background-color: white;
    border-radius: var(--border-radius);
    padding: 3rem 2rem;
    text-align: center;
    margin-bottom: 2rem;
    box-shadow: var(--box-shadow);
}

.success-icon {
    font-size: 4rem;
    color: var(--success-color);
    margin-bottom: 1.5rem;
}

.result-actions {
    display: flex;
    gap: 1rem;
    justify-content: center;
    margin-top: 2rem;
}

.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
    margin-bottom: 2rem;
}

.feature {
    text-align: center;
    padding: 1.5rem;
    background-color: white;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
}

.feature i {
    font-size: 2rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.feature h4 {
    margin-bottom: 0.5rem;
    color: var(--dark-color);
}

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

.copyright {
    text-align: center;
    color: var(--gray-color);
    font-size: 0.9rem;
    margin-top: 2rem;
}

@media (max-width: 768px) {
    .container {
        padding: 1rem;
    }
    
    header h1 {
        font-size: 2rem;
    }
    
    .thumbnail-container {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .action-buttons, .result-actions {
        flex-direction: column;
    }
    
    .time-inputs {
        flex-direction: column;
        gap: 0.5rem;
    }
}