:root {
    --primary-color: #4a6bff;
    --secondary-color: #ff6b6b;
    --dark-color: #2d3748;
    --light-color: #f7fafc;
    --gray-color: #a0aec0;
    --success-color: #48bb78;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Poppins', sans-serif;
}

body {
    background-color: #f5f7fa;
    color: var(--dark-color);
    line-height: 1.6;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

header {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    text-align: center;
    padding: 2rem 0;
    margin-bottom: 2rem;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

header h1 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
}

header p {
    font-size: 1.1rem;
    opacity: 0.9;
}

.download-form {
    background-color: white;
    border-radius: 10px;
    padding: 2rem;
    margin-bottom: 2rem;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
}

.input-group {
    display: flex;
    gap: 10px;
}

.input-group input {
    flex: 1;
    padding: 15px;
    border: 2px solid #e2e8f0;
    border-radius: 8px;
    font-size: 1rem;
    transition: border-color 0.3s;
}

.input-group input:focus {
    outline: none;
    border-color: var(--primary-color);
}

.input-group button {
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 8px;
    padding: 0 25px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.3s;
}

.input-group button:hover {
    background-color: #3a56e0;
}

.result-section {
    margin-bottom: 3rem;
}

.loading {
    display: none;
    text-align: center;
    padding: 2rem;
}

.spinner {
    border: 5px solid #f3f3f3;
    border-top: 5px solid var(--primary-color);
    border-radius: 50%;
    width: 50px;
    height: 50px;
    animation: spin 1s linear infinite;
    margin: 0 auto 1rem;
}

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

.result-container {
    display: none;
    background-color: white;
    border-radius: 10px;
    padding: 2rem;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
}

.video-result {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.video-thumbnail {
    position: relative;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

.video-thumbnail img {
    width: 100%;
    height: auto;
    display: block;
}

.video-info {
    flex: 1;
}

.video-info h3 {
    margin-bottom: 1rem;
    font-size: 1.3rem;
}

.download-btn {
    display: inline-block;
    background-color: var(--success-color);
    color: white;
    padding: 12px 25px;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    transition: background-color 0.3s;
}

.download-btn:hover {
    background-color: #38a169;
}

.features {
    margin-bottom: 3rem;
    text-align: center;
}

.features h2 {
    margin-bottom: 2rem;
    font-size: 1.8rem;
}

.platforms {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 20px;
}

.platform {
    background-color: white;
    border-radius: 8px;
    padding: 1.5rem;
    width: 150px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    transition: transform 0.3s;
}

.platform:hover {
    transform: translateY(-5px);
}

.platform i {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
    display: block;
}

.platform span {
    font-weight: 500;
}

.how-to-use {
    background-color: white;
    border-radius: 10px;
    padding: 2rem;
    margin-bottom: 3rem;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
}

.how-to-use h2 {
    margin-bottom: 1.5rem;
    font-size: 1.8rem;
}

.how-to-use ol {
    padding-left: 1.5rem;
}

.how-to-use li {
    margin-bottom: 0.8rem;
}

footer {
    background-color: var(--dark-color);
    color: white;
    text-align: center;
    padding: 2rem 0;
    margin-top: 3rem;
}

footer p {
    margin-bottom: 0.5rem;
}

@media (max-width: 768px) {
    .input-group {
        flex-direction: column;
    }

    .input-group button {
        padding: 15px;
    }

    header h1 {
        font-size: 2rem;
    }

    .platform {
        width: 120px;
        padding: 1rem;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }

    header {
        padding: 1.5rem 0;
    }

    .download-form {
        padding: 1.5rem;
    }

    .platform {
        width: 100px;
    }
}