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

:root {
    --primary-green: #4CAF50;
    --primary-green-light: #81C784;
    --primary-red: #F44336;
    --primary-red-light: #E57373;
    --white: #FFFFFF;
    --light-gray: #F5F5F5;
    --dark-gray: #333333;
    --text-gray: #666666;
    --border-radius: 8px;
    --box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--dark-gray);
    background-color: var(--white);
}

.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 15px;
}

/* Шапка */
.header {
    background: linear-gradient(135deg, var(--primary-green), var(--primary-green-light));
    padding: 15px 0;
    box-shadow: var(--box-shadow);
    position: sticky;
    top: 0;
    z-index: 100;
}

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

.logo h1 {
    color: var(--white);
    font-size: 1.8rem;
    font-weight: 700;
}

.logo i {
    margin-right: 10px;
}

.nav ul {
    display: flex;
    list-style: none;
}

.nav ul li {
    margin-left: 25px;
}

.nav ul li a {
    color: var(--white);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
    padding: 8px 12px;
    border-radius: var(--border-radius);
}

.nav ul li a:hover {
    background: rgba(255, 255, 255, 0.2);
}

/* Главный баннер */
.hero {
    background: linear-gradient(135deg, var(--light-gray), var(--white));
    padding: 80px 0;
    text-align: center;
}

.hero h1 {
    font-size: 2.5rem;
    margin-bottom: 20px;
    color: var(--dark-gray);
}

.subtitle {
    font-size: 1.2rem;
    color: var(--text-gray);
    margin-bottom: 40px;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.download-form {
    max-width: 700px;
    margin: 0 auto 30px;
    display: flex;
    gap: 15px;
}

#videoUrl {
    flex: 1;
    padding: 15px 20px;
    border: 2px solid #ddd;
    border-radius: var(--border-radius);
    font-size: 1rem;
    transition: var(--transition);
}

#videoUrl:focus {
    border-color: var(--primary-green);
    outline: none;
    box-shadow: 0 0 0 3px rgba(76, 175, 80, 0.2);
}

.btn-download {
    background: linear-gradient(135deg, var(--primary-green), var(--primary-green-light));
    color: white;
    border: none;
    padding: 0 30px;
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 10px;
    box-shadow: var(--box-shadow);
}

.btn-download:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 15px rgba(0, 0, 0, 0.15);
}

.btn-download:disabled {
    opacity: 0.7;
    cursor: not-allowed;
    transform: none;
}

.supported-text {
    color: var(--text-gray);
    font-size: 0.9rem;
}

/* Преимущества */
.advantages {
    padding: 80px 0;
    background: linear-gradient(135deg, var(--white), var(--light-gray));
}

.advantages h2 {
    text-align: center;
    font-size: 2rem;
    margin-bottom: 50px;
    color: var(--dark-gray);
}

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

.feature-card {
    background: var(--white);
    border-radius: var(--border-radius);
    padding: 30px;
    text-align: center;
    box-shadow: var(--box-shadow);
    transition: var(--transition);
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15);
}

.feature-icon {
    width: 70px;
    height: 70px;
    background: linear-gradient(135deg, var(--primary-green), var(--primary-green-light));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    color: white;
    font-size: 1.8rem;
}

.feature-card h3 {
    margin-bottom: 15px;
    font-size: 1.3rem;
}

/* Поддерживаемые платформы */
.platforms {
    padding: 80px 0;
    background: var(--white);
}

.platforms h2 {
    text-align: center;
    font-size: 2rem;
    margin-bottom: 15px;
    color: var(--dark-gray);
}

.section-description {
    text-align: center;
    color: var(--text-gray);
    margin-bottom: 50px;
    font-size: 1.1rem;
}

.platforms-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 25px;
    margin-bottom: 40px;
}

.platform-card {
    background: var(--white);
    border-radius: var(--border-radius);
    padding: 25px 15px;
    text-align: center;
    box-shadow: var(--box-shadow);
    transition: var(--transition);
    text-decoration: none;
    color: var(--dark-gray);
    display: block;
}

.platform-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15);
}

.platform-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--primary-green), var(--primary-green-light));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 15px;
    color: white;
    font-size: 1.5rem;
}

.platform-card h3 {
    margin-bottom: 10px;
    font-size: 1.1rem;
}

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

.view-all-platforms {
    text-align: center;
}

.btn-secondary {
    display: inline-block;
    background: linear-gradient(135deg, var(--primary-red), var(--primary-red-light));
    color: white;
    padding: 12px 30px;
    border-radius: var(--border-radius);
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
    box-shadow: var(--box-shadow);
}

.btn-secondary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 15px rgba(0, 0, 0, 0.15);
}

/* Как скачать */
.how-to {
    padding: 80px 0;
    background: linear-gradient(135deg, var(--light-gray), var(--white));
}

.how-to h2 {
    text-align: center;
    font-size: 2rem;
    margin-bottom: 50px;
    color: var(--dark-gray);
}

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

.step {
    background: var(--white);
    border-radius: var(--border-radius);
    padding: 30px;
    box-shadow: var(--box-shadow);
    text-align: center;
    position: relative;
}

.step-number {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--primary-green), var(--primary-green-light));
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    margin: 0 auto 20px;
}

.step h3 {
    margin-bottom: 15px;
    font-size: 1.3rem;
}

/* Поддерживаемые форматы */
.formats {
    padding: 80px 0;
    background: var(--white);
}

.formats h2 {
    text-align: center;
    font-size: 2rem;
    margin-bottom: 50px;
    color: var(--dark-gray);
}

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

.format-info h3, .quality-info h3 {
    margin-bottom: 20px;
    color: var(--dark-gray);
    font-size: 1.3rem;
}

.format-info ul {
    list-style: none;
}

.format-info ul li {
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.format-info ul li i {
    color: var(--primary-green);
}

.quality-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 15px;
}

.quality-tag {
    background: linear-gradient(135deg, var(--primary-green), var(--primary-green-light));
    color: white;
    padding: 5px 12px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 500;
}

/* FAQ */
.faq {
    padding: 80px 0;
    background: linear-gradient(135deg, var(--light-gray), var(--white));
}

.faq h2 {
    text-align: center;
    font-size: 2rem;
    margin-bottom: 50px;
    color: var(--dark-gray);
}

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

.faq-item {
    margin-bottom: 15px;
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--box-shadow);
    background: var(--white);
}

.faq-question {
    padding: 20px;
    background: linear-gradient(135deg, var(--primary-green), var(--primary-green-light));
    color: white;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    transition: var(--transition);
}

.faq-question:hover {
    background: linear-gradient(135deg, var(--primary-green-light), var(--primary-green));
}

.faq-question h3 {
    font-size: 1.1rem;
    font-weight: 500;
    margin: 0;
}

.faq-answer {
    padding: 0 20px;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease-out;
    background: var(--white);
}

.faq-answer p {
    padding: 20px 0;
    margin: 0;
}

.faq-item.active .faq-answer {
    max-height: 500px;
}

.faq-item.active .faq-question i {
    transform: rotate(180deg);
}

/* Полезная информация */
.info {
    padding: 80px 0;
    background: var(--white);
}

.info h2 {
    text-align: center;
    font-size: 2rem;
    margin-bottom: 50px;
    color: var(--dark-gray);
}

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

.info-card {
    background: linear-gradient(135deg, var(--light-gray), var(--white));
    border-radius: var(--border-radius);
    padding: 30px;
    box-shadow: var(--box-shadow);
}

.info-card h3 {
    margin-bottom: 15px;
    color: var(--dark-gray);
    display: flex;
    align-items: center;
    gap: 10px;
}

.info-card h3 i {
    color: var(--primary-green);
}

.info-card p {
    margin: 0;
}

/* Подвал */
.footer {
    background: linear-gradient(135deg, var(--dark-gray), #222);
    color: var(--white);
    padding: 60px 0 30px;
}

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

.footer-section h3, .footer-section h4 {
    margin-bottom: 20px;
    font-size: 1.3rem;
}

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

.footer-section ul li {
    margin-bottom: 10px;
}

.footer-section ul li a {
    color: #ccc;
    text-decoration: none;
    transition: var(--transition);
}

.footer-section ul li a:hover {
    color: var(--white);
    padding-left: 5px;
}

.footer-bottom {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: #aaa;
    font-size: 0.9rem;
}

/* Модальное окно результатов */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    overflow: auto;
}

.modal-content {
    background-color: var(--white);
    margin: 5% auto;
    padding: 30px;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    width: 90%;
    max-width: 600px;
    position: relative;
    max-height: 80vh;
    overflow-y: auto;
}

.close {
    color: var(--text-gray);
    float: right;
    font-size: 28px;
    font-weight: bold;
    cursor: pointer;
    position: absolute;
    right: 20px;
    top: 15px;
}

.close:hover {
    color: var(--dark-gray);
}

.result-thumbnail {
    width: 100%;
    border-radius: var(--border-radius);
    margin: 20px 0;
}

.formats-list {
    margin-top: 20px;
}

.formats-list h3 {
    margin-bottom: 20px;
    color: var(--dark-gray);
}

.format-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px;
    border-bottom: 1px solid #eee;
}

.format-item:last-child {
    border-bottom: none;
}

.format-info {
    flex: 1;
}

.btn-download-format {
    background: linear-gradient(135deg, var(--primary-green), var(--primary-green-light));
    color: white;
    border: none;
    padding: 8px 15px;
    border-radius: var(--border-radius);
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 5px;
}

.btn-download-format:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

.btn-download-format:disabled {
    opacity: 0.7;
    cursor: not-allowed;
}

/* Адаптивность */
@media (max-width: 992px) {
    .download-form {
        flex-direction: column;
    }
    
    .btn-download {
        padding: 15px;
        justify-content: center;
    }
}

@media (max-width: 768px) {
    .hero h1 {
        font-size: 2rem;
    }
    
    .subtitle {
        font-size: 1rem;
    }
    
    .header .container {
        flex-direction: column;
        gap: 20px;
    }
    
    .nav ul {
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .nav ul li {
        margin: 5px 10px;
    }
    
    .platforms-grid, .features-grid {
        grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    }
}

@media (max-width: 576px) {
    .container {
        width: 95%;
    }
    
    .hero {
        padding: 50px 0;
    }
    
    .hero h1 {
        font-size: 1.7rem;
    }
    
    .advantages, .platforms, .how-to, .formats, .faq, .info {
        padding: 50px 0;
    }
    
    .step {
        padding: 20px;
    }
    
    .format-item {
        flex-direction: column;
        gap: 15px;
        text-align: center;
    }
    
    .modal-content {
        width: 95%;
        margin: 10% auto;
        padding: 20px;
    }
}