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

body {
    font-family: 'Poppins', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.6;
    color: #333;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
}

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

/* Header */
.header {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
    padding: 15px 0;
}

.header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
}

.logo img {
    height: 32px;
}

.nav {
    display: flex;
    gap: 30px;
}

.nav a {
    text-decoration: none;
    color: #333;
    font-weight: 500;
    transition: color 0.3s;
    font-size: 15px;
}

.nav a:hover {
    color: #667eea;
}

/* Hero Section */
.hero {
    padding: 60px 0;
    text-align: center;
}

.hero-title {
    font-size: 48px;
    color: #fff;
    margin-bottom: 10px;
    font-weight: 700;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
}

.hero-subtitle {
    font-size: 24px;
    color: rgba(255, 255, 255, 0.95);
    margin-bottom: 40px;
    font-weight: 400;
}

/* Download Box */
.download-box {
    background: #fff;
    border-radius: 20px;
    padding: 40px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
    max-width: 700px;
    margin: 0 auto;
}

.input-group {
    display: flex;
    gap: 10px;
    margin-bottom: 15px;
}

.url-input {
    flex: 1;
    padding: 15px 20px;
    border: 2px solid #e0e0e0;
    border-radius: 12px;
    font-size: 16px;
    outline: none;
    transition: all 0.3s;
    font-family: 'Poppins', sans-serif;
}

.url-input:focus {
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.btn-download {
    padding: 15px 35px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: #fff;
    border: none;
    border-radius: 12px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    font-family: 'Poppins', sans-serif;
}

.btn-download:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 20px rgba(102, 126, 234, 0.4);
}

.btn-download:active {
    transform: translateY(0);
}

.hint {
    color: #666;
    font-size: 14px;
    margin-top: 10px;
}

/* Loading State */
.loading {
    background: #fff;
    border-radius: 20px;
    padding: 40px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
    max-width: 700px;
    margin: 20px auto;
    text-align: center;
}

.spinner {
    width: 50px;
    height: 50px;
    margin: 0 auto 20px;
    border: 4px solid #f3f3f3;
    border-top: 4px solid #667eea;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

/* Result Section */
.result {
    background: #fff;
    border-radius: 20px;
    padding: 40px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
    max-width: 700px;
    margin: 20px auto;
}

.result h3 {
    color: #333;
    margin-bottom: 25px;
    font-size: 24px;
}

.video-info {
    display: flex;
    gap: 20px;
    margin-bottom: 25px;
    padding: 20px;
    background: #f8f9fa;
    border-radius: 12px;
}

.thumbnail {
    width: 120px;
    height: 120px;
    object-fit: cover;
    border-radius: 10px;
}

.info-details {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.video-title {
    font-weight: 600;
    font-size: 16px;
    margin-bottom: 8px;
    color: #333;
}

.video-author {
    color: #666;
    font-size: 14px;
}

.download-options {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.btn-option {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 15px 25px;
    background: #f8f9fa;
    color: #333;
    border: 2px solid #e0e0e0;
    border-radius: 12px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    font-family: 'Poppins', sans-serif;
}

.btn-option:hover {
    background: #e9ecef;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.btn-option.btn-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: #fff;
    border: none;
}

.btn-option.btn-primary:hover {
    box-shadow: 0 5px 20px rgba(102, 126, 234, 0.4);
}

.btn-option svg {
    width: 20px;
    height: 20px;
}

/* Error Message */
.error {
    background: #fff3cd;
    border: 2px solid #ffc107;
    border-radius: 12px;
    padding: 20px;
    max-width: 700px;
    margin: 20px auto;
    text-align: center;
}

.error p {
    color: #856404;
    font-weight: 500;
}

/* Hidden Class */
.hidden {
    display: none !important;
}

/* App Promo Section */
.app-promo {
    background: rgba(255, 255, 255, 0.95);
    padding: 50px 0;
    text-align: center;
    margin-top: 40px;
}

.app-promo h2 {
    font-size: 32px;
    color: #333;
    margin-bottom: 15px;
}

.app-promo p {
    color: #666;
    font-size: 16px;
    margin-bottom: 30px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

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

.app-btn img {
    height: 50px;
    transition: transform 0.3s;
}

.app-btn:hover img {
    transform: translateY(-5px);
}

/* Features Section */
.features {
    background: #fff;
    padding: 80px 0;
}

.features h2 {
    text-align: center;
    font-size: 36px;
    margin-bottom: 50px;
    color: #333;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.feature-card {
    background: #f8f9fa;
    padding: 35px;
    border-radius: 16px;
    text-align: center;
    transition: all 0.3s;
    border: 2px solid transparent;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    border-color: #667eea;
}

.feature-icon {
    font-size: 48px;
    margin-bottom: 20px;
}

.feature-card h3 {
    font-size: 22px;
    margin-bottom: 12px;
    color: #333;
}

.feature-card p {
    color: #666;
    line-height: 1.7;
    font-size: 15px;
}

/* How to Use Section */
.how-to {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    padding: 80px 0;
    color: #fff;
}

.how-to h2 {
    text-align: center;
    font-size: 36px;
    margin-bottom: 50px;
}

.steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
}

.step {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    padding: 30px;
    border-radius: 16px;
    text-align: center;
}

.step-number {
    width: 60px;
    height: 60px;
    background: #fff;
    color: #667eea;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
    font-weight: 700;
    margin: 0 auto 20px;
}

.step-content h3 {
    font-size: 20px;
    margin-bottom: 12px;
}

.step-content p {
    color: rgba(255, 255, 255, 0.9);
    line-height: 1.6;
    font-size: 15px;
}

/* FAQ Section */
.faq {
    background: #fff;
    padding: 80px 0;
}

.faq h2 {
    text-align: center;
    font-size: 36px;
    margin-bottom: 50px;
    color: #333;
}

.faq-list {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    background: #f8f9fa;
    padding: 30px;
    border-radius: 12px;
    margin-bottom: 20px;
    border-left: 4px solid #667eea;
}

.faq-item h3 {
    font-size: 20px;
    margin-bottom: 12px;
    color: #333;
}

.faq-item p {
    color: #666;
    line-height: 1.7;
    margin-bottom: 10px;
}

.faq-item .example {
    background: #fff;
    padding: 10px 15px;
    border-radius: 6px;
    font-family: 'Courier New', monospace;
    font-size: 14px;
    color: #667eea;
    margin-top: 10px;
}

/* Footer */
.footer {
    background: #1a1a1a;
    color: #fff;
    padding: 50px 0 30px;
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-column h4 {
    font-size: 18px;
    margin-bottom: 20px;
    color: #fff;
}

.footer-column ul {
    list-style: none;
}

.footer-column ul li {
    margin-bottom: 12px;
}

.footer-column a {
    color: #aaa;
    text-decoration: none;
    transition: color 0.3s;
    font-size: 14px;
}

.footer-column a:hover {
    color: #667eea;
}

.footer-bottom {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid #333;
}

.footer-bottom p {
    color: #aaa;
    font-size: 14px;
    margin-bottom: 10px;
}

.disclaimer {
    font-size: 12px !important;
    color: #777 !important;
}

/* Responsive Design */
@media (max-width: 768px) {
    .header .container {
        flex-direction: column;
        gap: 15px;
    }

    .nav {
        gap: 15px;
    }

    .hero-title {
        font-size: 32px;
    }

    .hero-subtitle {
        font-size: 18px;
    }

    .download-box {
        padding: 25px;
    }

    .input-group {
        flex-direction: column;
    }

    .btn-download {
        width: 100%;
    }

    .video-info {
        flex-direction: column;
        text-align: center;
    }

    .thumbnail {
        margin: 0 auto;
    }

    .features h2,
    .how-to h2,
    .faq h2 {
        font-size: 28px;
    }

    .feature-grid,
    .steps {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 24px;
    }

    .hero-subtitle {
        font-size: 16px;
    }

    .logo h1 {
        font-size: 24px;
    }

    .nav a {
        font-size: 13px;
    }
}