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

:root {
    --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --secondary-gradient: linear-gradient(135deg, #00b09b 0%, #96c93d 100%);
    --background-color: #f8f9fa;
    --card-color: #ffffff;
    --text-color: #333333;
    --text-light: #777777;
    --border-radius: 15px;
    --shadow: 0 15px 30px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
}

body {
    font-family: 'Poppins', sans-serif;
    background: var(--background-color);
    color: var(--text-color);
    line-height: 1.6;
    min-height: 100vh;
}

.warning-banner {
    background: linear-gradient(to right, #ff416c, #ff4b2b);
    color: white;
    text-align: center;
    padding: 12px;
    font-weight: 500;
    box-shadow: 0 2px 10px rgba(255, 75, 43, 0.3);
}

.warning-banner a {
    color: white;
    text-decoration: underline;
    font-weight: 600;
}

.hero {
    background: var(--primary-gradient);
    color: white;
    text-align: center;
    padding: 50px 20px;
    margin-bottom: 40px;
    box-shadow: 0 4px 20px rgba(102, 126, 234, 0.4);
    position: relative;
    overflow: hidden;
}

.hero:before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1440 320"><path fill="rgba(255, 255, 255, 0.05)" fill-opacity="1" d="M0,32L48,48C96,64,192,96,288,106.7C384,117,480,107,576,96C672,85,768,75,864,96C960,117,1056,171,1152,181.3C1248,192,1344,160,1392,144L1440,128L1440,320L1392,320C1344,320,1248,320,1152,320C1056,320,960,320,864,320C768,320,672,320,576,320C480,320,384,320,288,320C192,320,96,320,48,320L0,320Z"></path></svg>') no-repeat bottom;
    background-size: cover;
    opacity: 0.5;
    z-index: 0;
}

.hero-content {
    position: relative;
    z-index: 1;
    animation: fadeIn 1s ease-out;
}

.hero-content h1 {
    font-size: 2.6rem;
    font-weight: 700;
    margin-bottom: 10px;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.2);
}

.hero-content h1 i {
    margin-right: 10px;
    color: #ff0000;
}

.hero-content p {
    font-size: 1.1rem;
    opacity: 0.95;
    max-width: 600px;
    margin: 0 auto;
    font-weight: 300;
}

.container {
    max-width: 1100px;
    margin: 0 auto 80px;
    padding: 0 20px;
}

.card {
    background: var(--card-color);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    padding: 40px;
    margin-bottom: 40px;
    transition: var(--transition);
    animation: slideUp 0.8s ease-out;
}

.main-card {
    background: white;
    position: relative;
}

.main-card:before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    background: linear-gradient(to bottom right, rgba(102, 126, 234, 0.05), rgba(118, 75, 162, 0.05));
    border-radius: var(--border-radius);
    z-index: 0;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
}

.result-card {
    display: none;
}

.card-header {
    display: flex;
    align-items: center;
    margin-bottom: 30px;
    border-bottom: 1px solid #f0f0f0;
    padding-bottom: 20px;
    position: relative;
    z-index: 1;
}

.card-header i {
    font-size: 28px;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-right: 15px;
}

.card-header h2 {
    font-weight: 600;
    color: #444;
    font-size: 1.8rem;
}

.form-group {
    margin-bottom: 30px;
    position: relative;
    z-index: 1;
}

label {
    display: block;
    margin-bottom: 10px;
    font-weight: 500;
    color: #555;
    font-size: 1.05rem;
}

.input-wrapper, .select-wrapper {
    position: relative;
}

.input-wrapper i, .select-wrapper i {
    position: absolute;
    left: 20px;
    top: 50%;
    transform: translateY(-50%);
    color: #764ba2;
    font-size: 18px;
}

.arrow-icon {
    left: auto !important;
    right: 20px !important;
    pointer-events: none;
    color: #999 !important;
}

input, select {
    width: 100%;
    padding: 16px 20px 16px 50px;
    border: 2px solid rgba(118, 75, 162, 0.2);
    border-radius: 50px;
    font-family: 'Poppins', sans-serif;
    font-size: 16px;
    transition: all 0.3s ease;
    background-color: rgba(255, 255, 255, 0.8);
    color: #333;
}

select {
    appearance: none;
    cursor: pointer;
    background-image: none;
    padding-right: 50px;
}

input:focus, select:focus {
    outline: none;
    border-color: #764ba2;
    box-shadow: 0 0 15px rgba(118, 75, 162, 0.15);
    background-color: white;
}

.btn-download {
    display: block;
    width: 100%;
    background: var(--primary-gradient);
    color: white;
    border: none;
    border-radius: 50px;
    padding: 16px;
    font-size: 18px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 10px 20px rgba(118, 75, 162, 0.3);
    text-align: center;
    font-family: 'Poppins', sans-serif;
    position: relative;
    overflow: hidden;
    z-index: 1;
}

.btn-download i {
    margin-right: 10px;
}

.btn-download: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: 0.5s;
    z-index: -1;
}

.btn-download:hover {
    transform: translateY(-3px);
    box-shadow: 0 15px 30px rgba(118, 75, 162, 0.4);
}

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

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

.loader {
    text-align: center;
    padding: 30px 0;
    display: none;
}

.spinner {
    display: inline-block;
    width: 60px;
    height: 60px;
    border: 4px solid rgba(118, 75, 162, 0.1);
    border-radius: 50%;
    border-top-color: #764ba2;
    animation: spin 1s ease-in-out infinite;
    margin-bottom: 15px;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.video-info {
    margin-bottom: 25px;
    animation: fadeIn 0.5s ease-out;
}

.video-info p {
    margin-bottom: 12px;
    font-size: 1.05rem;
}

.video-info img {
    max-width: 100%;
    border-radius: var(--border-radius);
    margin-top: 20px;
    box-shadow: 0 8px 15px rgba(0, 0, 0, 0.1);
}

.download-section {
    text-align: center;
    margin-top: 30px;
    animation: fadeIn 0.8s ease-out;
}

.download-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: var(--secondary-gradient);
    color: white;
    text-decoration: none;
    padding: 16px 35px;
    border-radius: 50px;
    font-weight: 600;
    font-size: 1.1rem;
    transition: all 0.3s ease;
    box-shadow: 0 10px 20px rgba(0, 176, 155, 0.3);
    position: relative;
    overflow: hidden;
}

.download-button i {
    margin-right: 10px;
    font-size: 20px;
}

.download-button: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: 0.5s;
}

.download-button:hover {
    transform: translateY(-3px);
    box-shadow: 0 15px 30px rgba(0, 176, 155, 0.4);
}

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

.features-section {
    display: flex;
    justify-content: space-between;
    margin-top: 50px;
    gap: 30px;
    flex-wrap: wrap;
}

.feature-card {
    background: white;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    padding: 30px;
    flex: 1;
    text-align: center;
    min-width: 250px;
    transition: var(--transition);
    animation: fadeIn 1s ease-out;
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
}

.feature-card i {
    font-size: 3rem;
    margin-bottom: 20px;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.feature-card h3 {
    font-size: 1.4rem;
    margin-bottom: 15px;
    color: #444;
}

.feature-card p {
    color: var(--text-light);
}

footer {
    background: #2d2d2d;
    color: white;
    padding: 50px 20px;
    text-align: center;
}

.footer-content {
    max-width: 1100px;
    margin: 0 auto;
}

.footer-links {
    margin-bottom: 20px;
}

.footer-links a {
    color: #ccc;
    text-decoration: none;
    margin: 0 15px;
    font-weight: 500;
    transition: color 0.3s;
}

.footer-links a:hover {
    color: #96c93d;
}

.separator {
    color: #666;
    margin: 0 5px;
}

.copyright {
    color: #999;
    font-size: 0.9rem;
}

.notification {
    position: fixed;
    top: 20px;
    right: 20px;
    padding: 15px 20px;
    border-radius: 10px;
    background: white;
    box-shadow: 0 5px 20px rgba(0,0,0,0.2);
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 350px;
    max-width: calc(100vw - 40px);
    transform: translateX(120%);
    transition: transform 0.3s ease;
    z-index: 1000;
}

.notification.show {
    transform: translateX(0);
}

.notification.error {
    border-left: 4px solid #ff4b2b;
}

.notification.success {
    border-left: 4px solid #00b09b;
}

.notification-content {
    display: flex;
    align-items: center;
}

.notification-content i {
    margin-right: 12px;
    font-size: 20px;
}

.notification.error i {
    color: #ff4b2b;
}

.notification.success i {
    color: #00b09b;
}

.notification-content p {
    font-size: 0.95rem;
    color: #444;
}

.notification-close {
    background: transparent;
    border: none;
    cursor: pointer;
    font-size: 16px;
    color: #777;
}

.disabled {
    opacity: 0.7;
    cursor: not-allowed !important;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes slideUp {
    from { 
        opacity: 0;
        transform: translateY(30px);
    }
    to { 
        opacity: 1;
        transform: translateY(0);
    }
}

@media (max-width: 768px) {
    .hero-content h1 {
        font-size: 1.8rem;
    }
    
    .hero-content p {
        font-size: 0.95rem;
    }
    
    .card {
        padding: 30px 20px;
    }
    
    .features-section {
        flex-direction: column;
    }
    
    .feature-card {
        width: 100%;
    }
    
    .btn-download, .download-button {
        padding: 14px;
        font-size: 1rem;
    }
    
    input, select {
        padding: 14px 20px 14px 50px;
    }
}

#videoQualityContainer {
    display: none;
}