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

body {
    font-family: 'Roboto', sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f9fafc;
    font-size: 16px;
    min-height: 100vh;
}

/* Цветовая палитра в стиле Netology */
:root {
    --primary-color: #1C68F3;
    --secondary-color: #f5f7fa;
    --accent-color: #FF6B35;
    --text-dark: #1A1A1A;
    --text-light: #666;
    --text-gray: #999;
    --border-color: #e6e9ee;
    --success-color: #00C853;
    --warning-color: #FF9800;
    --danger-color: #F44336;
    --shadow-light: 0 2px 16px rgba(0, 0, 0, 0.08);
    --shadow-medium: 0 4px 24px rgba(0, 0, 0, 0.12);
    --radius-small: 4px;
    --radius-medium: 8px;
    --radius-large: 12px;
}

/* Стили для страницы входа - Netology стиль */
.login-page {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 20px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.login-container {
    max-width: 95%;
    width: 100%;
    background-color: white;
    border-radius: var(--radius-large);
    box-shadow: var(--shadow-medium);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    min-height: 90vh;
}

.login-header {
    text-align: center;
    padding: 40px 30px 20px;
    background: linear-gradient(135deg, var(--primary-color), #764ba2);
    color: white;
    flex-shrink: 0;
}

.login-header h1 {
    font-size: 1.8rem;
    margin-bottom: 10px;
    font-weight: 600;
}

.login-header p {
    font-size: 0.95rem;
    opacity: 0.9;
}

.login-box {
    padding: 30px;
    flex: 1;
}

.lock-icon {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 20px;
    display: block;
    text-align: center;
}

.login-box h2 {
    text-align: center;
    margin-bottom: 15px;
    color: var(--text-dark);
    font-size: 1.3rem;
}

.login-description {
    text-align: center;
    color: var(--text-light);
    margin-bottom: 25px;
    font-size: 0.95rem;
    line-height: 1.5;
}

.password-input-container {
    display: flex;
    gap: 10px;
    margin-bottom: 25px;
}

.password-input-container input {
    flex: 1;
    padding: 16px;
    font-size: 1.5rem;
    text-align: center;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-medium);
    letter-spacing: 8px;
    transition: all 0.3s;
    background: var(--secondary-color);
}

.password-input-container input:focus {
    border-color: var(--primary-color);
    outline: none;
    box-shadow: 0 0 0 3px rgba(28, 104, 243, 0.1);
}

.password-input-container button {
    background-color: var(--secondary-color);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-medium);
    padding: 16px;
    cursor: pointer;
    color: var(--text-light);
    transition: all 0.3s;
    min-width: 60px;
}

.password-input-container button:hover {
    background-color: #e6e9ee;
}

.password-hint {
    margin: 15px 0 25px;
    color: var(--text-light);
    font-size: 0.85rem;
    text-align: center;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.password-hint i {
    color: var(--warning-color);
}

.auth-container {
    margin-top: 20px;
    flex: 1;
}

.btn-login {
    background: var(--primary-color);
    color: white;
    border: none;
    padding: 16px;
    border-radius: var(--radius-medium);
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s;
    width: 100%;
    display: block;
    text-align: center;
}

.btn-login:hover {
    background: #1558d6;
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(28, 104, 243, 0.3);
}

.error-message {
    color: var(--danger-color);
    margin-top: 15px;
    padding: 12px;
    border-radius: var(--radius-medium);
    background-color: rgba(244, 67, 54, 0.1);
    text-align: center;
    font-size: 0.9rem;
    border: 1px solid rgba(244, 67, 54, 0.2);
}

.error-message i {
    margin-right: 5px;
}

.login-footer {
    margin-top: 25px;
    color: var(--text-light);
    font-size: 0.85rem;
    text-align: center;
    border-top: 1px solid var(--border-color);
    padding-top: 20px;
    flex-shrink: 0;
}

.login-footer i {
    color: var(--primary-color);
    margin-right: 5px;
}

/* Стили для основной страницы курса - Netology стиль */
.course-page {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    background-color: #f9fafc;
}

/* Шапка сайта - Netology стиль */
.header {
    background: white;
    padding: 16px 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo i {
    font-size: 1.8rem;
    color: var(--primary-color);
}

.logo h1 {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--text-dark);
    margin: 0;
}

.menu-toggle {
    display: none;
    background: none;
    border: 1px solid var(--border-color);
    color: var(--text-dark);
    font-size: 1.2rem;
    cursor: pointer;
    padding: 8px 12px;
    border-radius: var(--radius-small);
    transition: all 0.3s;
}

.menu-toggle:hover {
    background: var(--secondary-color);
}

/* Основной контейнер */
.main-container {
    display: flex;
    flex: 1;
    min-height: calc(100vh - 80px);
}

/* Боковое меню - Netology стиль */
.sidebar {
    width: 280px;
    background-color: white;
    border-right: 1px solid var(--border-color);
    padding: 24px 0;
    overflow-y: auto;
    transition: all 0.3s;
}

.sidebar-nav ul {
    list-style-type: none;
}

.sidebar-nav li {
    margin: 4px 16px;
    border-radius: var(--radius-medium);
    overflow: hidden;
}

.sidebar-nav a {
    display: flex;
    align-items: center;
    padding: 14px 16px;
    color: var(--text-dark);
    text-decoration: none;
    transition: all 0.3s;
    font-size: 0.95rem;
    border-left: 3px solid transparent;
}

.sidebar-nav a:hover {
    background-color: var(--secondary-color);
    color: var(--primary-color);
    padding-left: 20px;
    border-left-color: var(--primary-color);
}

.sidebar-nav a.active {
    background-color: rgba(28, 104, 243, 0.08);
    color: var(--primary-color);
    font-weight: 500;
    border-left-color: var(--primary-color);
}

.sidebar-nav i {
    margin-right: 12px;
    width: 20px;
    text-align: center;
    font-size: 1.1rem;
}

/* Основное содержимое - Netology стиль */
.content {
    flex: 1;
    padding: 32px 40px;
    overflow-y: auto;
    background-color: #f9fafc;
}

.content-header {
    margin-bottom: 32px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--border-color);
}

.content-header h2 {
    font-size: 1.8rem;
    color: var(--text-dark);
    margin-bottom: 8px;
    font-weight: 600;
}

.content-header p {
    color: var(--text-light);
    font-size: 1rem;
}

.module-content {
    background-color: white;
    border-radius: var(--radius-large);
    padding: 32px;
    box-shadow: var(--shadow-light);
    margin-bottom: 32px;
}

.lesson {
    margin-bottom: 28px;
    padding-bottom: 28px;
    border-bottom: 1px solid var(--border-color);
}

.lesson:last-child {
    margin-bottom: 0;
    padding-bottom: 0;
    border-bottom: none;
}

.lesson h3 {
    font-size: 1.3rem;
    color: var(--text-dark);
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    gap: 12px;
    font-weight: 600;
}

.lesson h3 i {
    color: var(--primary-color);
    font-size: 1.2rem;
}

.lesson-content {
    color: var(--text-dark);
    line-height: 1.7;
    font-size: 1rem;
}

.lesson-content p {
    margin-bottom: 16px;
}

.lesson-content ol, .lesson-content ul {
    margin: 16px 0;
    padding-left: 24px;
}

.lesson-content li {
    margin-bottom: 8px;
}

.highlight-box {
    background: linear-gradient(135deg, rgba(28, 104, 243, 0.05) 0%, rgba(28, 104, 243, 0.02) 100%);
    border: 1px solid rgba(28, 104, 243, 0.1);
    border-radius: var(--radius-medium);
    padding: 20px;
    margin: 20px 0;
}

.highlight-box h4 {
    color: var(--primary-color);
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.highlight-box ul {
    list-style-type: none;
    padding-left: 0;
}

.highlight-box li {
    margin-bottom: 8px;
    color: var(--text-dark);
    position: relative;
    padding-left: 24px;
}

.highlight-box li:before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--success-color);
    font-weight: bold;
}

/* Карточки модулей - Netology стиль */
.course-structure {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.module-card {
    background: white;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-medium);
    padding: 20px;
    cursor: pointer;
    transition: all 0.3s;
    position: relative;
    overflow: hidden;
}

.module-card::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    height: 100%;
    width: 4px;
    background: var(--primary-color);
    transition: width 0.3s;
}

.module-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-light);
    border-color: var(--primary-color);
}

.module-card:hover::before {
    width: 6px;
}

.module-card h4 {
    color: var(--text-dark);
    margin-bottom: 8px;
    font-size: 1.1rem;
    display: flex;
    align-items: center;
    gap: 10px;
}

.module-card p {
    color: var(--text-light);
    font-size: 0.95rem;
    line-height: 1.5;
    margin: 0;
}

/* Стили профиля */
.profile-header {
    display: flex;
    align-items: center;
    gap: 15px;
    margin-bottom: 20px;
}

.profile-avatar {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, #1a2980, #26d0ce);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 24px;
}

.profile-header h4 {
    margin: 0;
    color: var(--text-dark);
}

.profile-header p {
    color: var(--text-light);
    margin: 5px 0 0 0;
}

.profile-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-top: 20px;
}

.btn-primary {
    background: var(--primary-color);
    color: white;
    border: none;
    padding: 14px 28px;
    border-radius: var(--radius-medium);
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    flex: 1;
    min-width: 200px;
}

.btn-primary:hover {
    background: #1558d6;
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(28, 104, 243, 0.3);
}

.btn-secondary {
    background: white;
    color: var(--text-dark);
    border: 1px solid var(--border-color);
    padding: 14px 28px;
    border-radius: var(--radius-medium);
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    flex: 1;
    min-width: 200px;
}

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

/* Подвал - Netology стиль */
.footer {
    background: var(--text-dark);
    color: rgba(255, 255, 255, 0.7);
    text-align: center;
    padding: 20px;
    font-size: 0.9rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

/* Адаптивность */
@media (max-width: 992px) {
    .sidebar {
        width: 240px;
    }
    
    .content {
        padding: 24px;
    }
}

@media (max-width: 768px) {
    /* Мобильная версия - login-header на весь экран */
    .login-page {
        padding: 0;
        background: linear-gradient(135deg, var(--primary-color), #764ba2);
    }
    
    .login-container {
        max-width: 100%;
        width: 100%;
        border-radius: 0;
        box-shadow: none;
        min-height: 100vh;
        margin: 0;
    }
    
    .login-header {
        min-height: 16vh; /* Уменьшено с 50vh в 3 раза ≈ 16.6vh */
        display: flex;
        flex-direction: column;
        justify-content: center;
        padding: 30px 20px 20px;
        border-radius: 0;
    }
    
    .login-header h1 {
        font-size: 1.6rem;
        margin-bottom: 10px;
    }
    
    .login-header p {
        font-size: 1rem;
        opacity: 0.9;
        max-width: 500px;
        margin: 0 auto;
    }
    
    .login-box {
        padding: 20px;
        background: white;
        border-radius: var(--radius-large) var(--radius-large) 0 0;
        margin-top: -20px; /* Уменьшен отступ */
        position: relative;
        z-index: 1;
        box-shadow: var(--shadow-medium);
        min-height: 84vh; /* Увеличено для компенсации */
    }
    
    .auth-container {
        margin-top: 10px;
    }
    
    /* Основная страница курса */
    .main-container {
        flex-direction: column;
    }
    
    .sidebar {
        position: fixed;
        top: 72px;
        left: -280px;
        height: calc(100vh - 72px);
        z-index: 90;
        box-shadow: var(--shadow-medium);
        width: 280px;
    }
    
    .sidebar.open {
        left: 0;
    }
    
    .menu-toggle {
        display: block;
    }
    
    .content {
        padding: 20px;
    }
    
    .module-content {
        padding: 24px;
    }
    
    .content-header h2 {
        font-size: 1.5rem;
    }
    
    .profile-actions {
        flex-direction: column;
    }
    
    .btn-primary, .btn-secondary {
        width: 100%;
        min-width: auto;
    }
    
    /* Промо-блок на главной странице */
    .course-promo {
        padding: 20px;
        margin: 15px 0 30px;
    }
    
    .promo-text h3 {
        font-size: 1.3rem;
    }
    
    .final-price h3 {
        font-size: 1.5rem;
    }
    
    .buy-course-btn {
        padding: 16px;
        font-size: 1.1rem;
    }
}

@media (max-width: 576px) {
    .login-header {
        min-height: 18vh; /* Слегка увеличено для мобильных */
        padding: 25px 15px 15px;
    }
    
    .login-header h1 {
        font-size: 1.4rem;
    }
    
    .login-header p {
        font-size: 0.9rem;
    }
    
    .login-box {
        padding: 15px;
        margin-top: -15px; /* Уменьшен отступ */
        min-height: 82vh; /* Увеличен для компенсации */
    }
    
    .auth-container {
        padding: 15px;
    }
    
    .content {
        padding: 16px;
    }
    
    .module-content {
        padding: 20px;
    }
    
    .btn-login, .btn-primary, .btn-secondary {
        padding: 14px;
    }
    
    .password-input-container input {
        font-size: 1.2rem;
        padding: 14px;
        letter-spacing: 6px;
    }
    
    .course-promo {
        padding: 15px;
    }
    
    .promo-features {
        gap: 8px;
    }
    
    .price-info {
        padding: 15px;
    }
    
    .buy-course-btn {
        padding: 14px;
        font-size: 1rem;
    }
}

/* Стиль для скрытия загрузки */
#app .loading {
    display: none;
}

/* Стили для форм аутентификации в стиле Netology */
.auth-container {
    background: white;
    border-radius: var(--radius-large);
    box-shadow: var(--shadow-medium);
    padding: 40px;
    max-width: 500px;
    width: 100%;
    margin: 20px auto;
}

.tab-switcher {
    display: flex;
    margin-bottom: 30px;
    border-bottom: 2px solid var(--border-color);
}

.tab {
    flex: 1;
    padding: 15px;
    text-align: center;
    cursor: pointer;
    border: none;
    background: none;
    font-size: 16px;
    font-weight: 600;
    color: var(--text-light);
    transition: all 0.3s;
    position: relative;
}

.tab.active {
    color: var(--primary-color);
}

.tab.active::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 100%;
    height: 3px;
    background: var(--primary-color);
}

.form-container {
    display: none;
}

.form-container.active {
    display: block;
}

.form-header {
    text-align: center;
    margin-bottom: 25px;
}

.form-header h3 {
    font-size: 1.4rem;
    color: var(--text-dark);
    margin-bottom: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}

.form-subtitle {
    color: var(--text-light);
    font-size: 0.95rem;
}

.auth-form {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.form-input {
    width: 100%;
    padding: 16px;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-medium);
    font-size: 16px;
    transition: all 0.3s;
    background: var(--secondary-color);
}

.form-input:focus {
    border-color: var(--primary-color);
    outline: none;
    box-shadow: 0 0 0 3px rgba(28, 104, 243, 0.1);
}

.step-indicator {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-bottom: 25px;
}

.step {
    width: 35px;
    height: 35px;
    border-radius: 50%;
    background: var(--secondary-color);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    color: var(--text-light);
    transition: all 0.3s;
}

.step.active {
    background: var(--primary-color);
    color: white;
    transform: scale(1.1);
}

.step.completed {
    background: var(--success-color);
    color: white;
}

.info-box {
    background: var(--secondary-color);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-medium);
    padding: 15px;
    margin: 15px 0;
    display: flex;
    gap: 12px;
    align-items: flex-start;
}

.info-box i {
    color: var(--primary-color);
    font-size: 1.2rem;
    margin-top: 3px;
}

.info-box div {
    flex: 1;
    font-size: 0.9rem;
    line-height: 1.5;
    color: var(--text-dark);
}

.info-box strong {
    color: var(--text-dark);
}

.terms-checkbox {
    display: flex;
    align-items: center;
    gap: 10px;
    margin: 10px 0;
}

.checkbox-input {
    width: 18px;
    height: 18px;
    cursor: pointer;
}

.checkbox-label {
    font-size: 0.9rem;
    color: var(--text-dark);
    cursor: pointer;
}

.form-footer {
    text-align: center;
    margin-top: 20px;
    padding-top: 15px;
    border-top: 1px solid var(--border-color);
    color: var(--text-light);
    font-size: 0.9rem;
}

.form-link {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s;
}

.form-link:hover {
    color: #1558d6;
    text-decoration: underline;
}

.btn-secondary {
    background: white;
    color: var(--text-dark);
    border: 1px solid var(--border-color);
    padding: 16px;
    border-radius: var(--radius-medium);
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s;
    text-decoration: none;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    width: 100%;
    margin-top: 10px;
}

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

.error-page {
    text-align: center;
    padding: 40px 20px;
}

.error-icon {
    font-size: 4rem;
    color: var(--danger-color);
    margin-bottom: 20px;
}

.error-description {
    color: var(--text-light);
    margin: 20px 0;
    font-size: 1rem;
    line-height: 1.6;
}

.auth-message {
    padding: 15px;
    border-radius: var(--radius-medium);
    margin: 15px 0;
    text-align: center;
    font-size: 0.95rem;
    line-height: 1.5;
}

.auth-message.error {
    background-color: rgba(244, 67, 54, 0.1);
    color: var(--danger-color);
    border: 1px solid rgba(244, 67, 54, 0.2);
}

.auth-message.success {
    background-color: rgba(76, 175, 80, 0.1);
    color: var(--success-color);
    border: 1px solid rgba(76, 175, 80, 0.2);
}

.auth-message.info {
    background-color: rgba(33, 150, 243, 0.1);
    color: var(--primary-color);
    border: 1px solid rgba(33, 150, 243, 0.2);
}

.auth-message.loading {
    background-color: rgba(33, 150, 243, 0.1);
    color: var(--primary-color);
    border: 1px solid rgba(33, 150, 243, 0.2);
}

.auth-message i {
    margin-right: 8px;
}

/* Стили для промо-блока на главной странице */
.course-promo {
    background: white;
    border-radius: var(--radius-large);
    padding: 30px;
    margin: 20px 0 40px;
    box-shadow: var(--shadow-light);
}

.promo-content {
    display: flex;
    flex-direction: column;
    gap: 30px;
}

@media (min-width: 992px) {
    .promo-content {
        flex-direction: row;
        align-items: flex-start;
    }
}

.promo-video {
    flex: 1;
    min-width: 0;
}

.promo-video .video-container {
    width: 100%;
    max-width: 800px;
    margin: 0 auto;
    aspect-ratio: 16/9;
    position: relative;
    border-radius: var(--radius-medium);
    overflow: hidden;
    box-shadow: var(--shadow-medium);
}

.promo-video iframe {
    width: 100%;
    height: 100%;
    position: absolute;
    top: 0;
    left: 0;
    border: none;
}

.promo-text {
    flex: 1;
    min-width: 0;
}

.promo-text h3 {
    font-size: 1.5rem;
    color: var(--text-dark);
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.promo-features {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin: 20px 0;
}

.feature {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--text-dark);
}

.feature i {
    color: var(--success-color);
    font-size: 1.1rem;
}

.price-info {
    background: linear-gradient(135deg, rgba(28, 104, 243, 0.05) 0%, rgba(28, 104, 243, 0.02) 100%);
    border: 1px solid rgba(28, 104, 243, 0.1);
    border-radius: var(--radius-medium);
    padding: 20px;
    margin: 25px 0;
}

.original-price {
    font-size: 1rem;
    color: var(--text-light);
    margin-bottom: 10px;
}

.original-price s {
    color: var(--danger-color);
}

.discount {
    margin-bottom: 15px;
}

.discount-badge {
    background: linear-gradient(135deg, #FF6B35, #FF9D00);
    color: white;
    padding: 6px 12px;
    border-radius: var(--radius-small);
    font-weight: 600;
    font-size: 0.9rem;
}

.final-price {
    text-align: center;
}

.final-price h3 {
    font-size: 1.8rem;
    color: var(--text-dark);
    margin: 10px 0;
}

.final-price .price {
    color: var(--primary-color);
    font-weight: 700;
}

.final-price p {
    color: var(--text-light);
    font-size: 0.95rem;
}

.promo-footer {
    margin-top: 20px;
    padding-top: 20px;
    border-top: 1px solid var(--border-color);
}

.promo-footer p {
    display: flex;
    align-items: center;
    gap: 10px;
    margin: 10px 0;
    color: var(--text-dark);
    font-size: 0.95rem;
}

.promo-footer i {
    color: var(--primary-color);
}

/* Стили для адаптивности промо-блока */
@media (max-width: 768px) {
    .course-promo {
        padding: 20px;
        margin: 15px 0 30px;
    }
    
    .promo-text h3 {
        font-size: 1.3rem;
    }
    
    .final-price h3 {
        font-size: 1.5rem;
    }
}

@media (max-width: 576px) {
    .course-promo {
        padding: 15px;
    }
    
    .promo-features {
        gap: 8px;
    }
    
    .price-info {
        padding: 15px;
    }
}

/* Стили для кнопки покупки курса */
.buy-course-btn {
    background: linear-gradient(135deg, var(--success-color), #00a848);
    color: white;
    border: none;
    padding: 18px 30px;
    border-radius: var(--radius-medium);
    font-size: 1.2rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    width: 100%;
    margin-top: 20px;
    box-shadow: 0 6px 20px rgba(0, 200, 83, 0.3);
}

.buy-course-btn:hover {
    background: linear-gradient(135deg, #00b347, #008c3a);
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(0, 200, 83, 0.4);
}

.buy-course-btn i {
    font-size: 1.3rem;
}

.payment-info {
    margin-top: 15px;
    padding-top: 15px;
    border-top: 1px solid var(--border-color);
    text-align: center;
}

.payment-info p {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    margin: 8px 0;
    color: var(--text-light);
    font-size: 0.9rem;
}

.payment-info i {
    color: var(--primary-color);
}

/* Стили для промо-блока на главной странице */
.course-promo {
    background: white;
    border-radius: var(--radius-large);
    padding: 30px;
    margin: 20px 0 40px;
    box-shadow: var(--shadow-light);
}

.promo-content {
    display: flex;
    flex-direction: column;
    gap: 30px;
}

@media (min-width: 992px) {
    .promo-content {
        flex-direction: row;
        align-items: flex-start;
    }
}

.promo-video {
    flex: 1;
    min-width: 0;
}

.promo-video .video-container {
    width: 100%;
    max-width: 800px;
    margin: 0 auto;
    aspect-ratio: 16/9;
    position: relative;
    border-radius: var(--radius-medium);
    overflow: hidden;
    box-shadow: var(--shadow-medium);
}

.promo-video iframe {
    width: 100%;
    height: 100%;
    position: absolute;
    top: 0;
    left: 0;
    border: none;
}

.promo-text {
    flex: 1;
    min-width: 0;
}

.promo-text h3 {
    font-size: 1.5rem;
    color: var(--text-dark);
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.promo-features {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin: 20px 0;
}

.feature {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--text-dark);
}

.feature i {
    color: var(--success-color);
    font-size: 1.1rem;
}

.price-info {
    background: linear-gradient(135deg, rgba(28, 104, 243, 0.05) 0%, rgba(28, 104, 243, 0.02) 100%);
    border: 1px solid rgba(28, 104, 243, 0.1);
    border-radius: var(--radius-medium);
    padding: 20px;
    margin: 25px 0;
}

.original-price {
    font-size: 1rem;
    color: var(--text-light);
    margin-bottom: 10px;
}

.original-price s {
    color: var(--danger-color);
}

.discount {
    margin-bottom: 15px;
}

.discount-badge {
    background: linear-gradient(135deg, #FF6B35, #FF9D00);
    color: white;
    padding: 6px 12px;
    border-radius: var(--radius-small);
    font-weight: 600;
    font-size: 0.9rem;
}

.final-price {
    text-align: center;
}

.final-price h3 {
    font-size: 1.8rem;
    color: var(--text-dark);
    margin: 10px 0;
}

.final-price .price {
    color: var(--primary-color);
    font-weight: 700;
}

.final-price p {
    color: var(--text-light);
    font-size: 0.95rem;
}

.promo-footer {
    margin-top: 20px;
    padding-top: 20px;
    border-top: 1px solid var(--border-color);
}

.promo-footer p {
    display: flex;
    align-items: center;
    gap: 10px;
    margin: 10px 0;
    color: var(--text-dark);
    font-size: 0.95rem;
}

.promo-footer i {
    color: var(--primary-color);
}

/* Стили для адаптивности промо-блока */
@media (max-width: 768px) {
    .course-promo {
        padding: 20px;
        margin: 15px 0 30px;
    }
    
    .promo-text h3 {
        font-size: 1.3rem;
    }
    
    .final-price h3 {
        font-size: 1.5rem;
    }
    
    .buy-course-btn {
        padding: 16px;
        font-size: 1.1rem;
    }
}

@media (max-width: 576px) {
    .course-promo {
        padding: 15px;
    }
    
    .promo-features {
        gap: 8px;
    }
    
    .price-info {
        padding: 15px;
    }
    
    .buy-course-btn {
        padding: 14px;
        font-size: 1rem;
    }
}

/* Дополнительные медиа-запросы для улучшения мобильного отображения */
@media (max-width: 480px) {
    .login-header {
        min-height: 20vh; /* Увеличено для очень маленьких экранов */
        padding: 20px 15px 10px;
    }
    
    .login-header h1 {
        font-size: 1.3rem;
        line-height: 1.3;
        margin-bottom: 8px;
    }
    
    .login-header p {
        font-size: 0.85rem;
        line-height: 1.4;
    }
    
    .login-box {
        padding: 15px 10px;
        margin-top: -15px;
        min-height: 80vh; /* Увеличено для компенсации */
    }
    
    .auth-container {
        padding: 10px;
    }
    
    .tab-switcher {
        margin-bottom: 20px;
    }
    
    .tab {
        padding: 12px 8px;
        font-size: 14px;
    }
    
    .form-header h3 {
        font-size: 1.2rem;
    }
    
    .form-input {
        padding: 14px;
        font-size: 14px;
    }
    
    .btn-login {
        padding: 14px;
        font-size: 0.95rem;
    }
    
    .info-box {
        padding: 12px;
        font-size: 0.85rem;
    }
    
    .step-indicator {
        gap: 15px;
    }
    
    .step {
        width: 30px;
        height: 30px;
        font-size: 0.9rem;
    }
}



/* Стили для страницы контактов */
.contact-info {
    display: flex;
    flex-direction: column;
    gap: 15px;
    margin: 20px 0;
}

.contact-card {
    display: flex;
    align-items: center;
    gap: 20px;
    padding: 20px;
    background: var(--secondary-color);
    border-radius: var(--radius-medium);
    border: 1px solid var(--border-color);
    transition: all 0.3s;
}

.contact-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-light);
    border-color: var(--primary-color);
}

.contact-icon {
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--primary-color), #764ba2);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.5rem;
    flex-shrink: 0;
}

.contact-details h4 {
    margin: 0 0 5px 0;
    color: var(--text-dark);
    font-size: 1rem;
    font-weight: 600;
}

.contact-details p {
    margin: 0;
    color: var(--text-dark);
    font-size: 1.1rem;
}

.contact-details a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color 0.3s;
}

.contact-details a:hover {
    color: #1558d6;
    text-decoration: underline;
}

.contact-notes {
    background: linear-gradient(135deg, rgba(28, 104, 243, 0.05) 0%, rgba(28, 104, 243, 0.02) 100%);
    border: 1px solid rgba(28, 104, 243, 0.1);
    border-radius: var(--radius-medium);
    padding: 20px;
    margin: 30px 0;
}

.contact-notes h4 {
    color: var(--primary-color);
    margin-bottom: 15px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.contact-notes ul {
    list-style-type: none;
    padding-left: 0;
}

.contact-notes li {
    margin-bottom: 10px;
    padding-left: 25px;
    position: relative;
    color: var(--text-dark);
    line-height: 1.6;
}

.contact-notes li:before {
    content: "•";
    position: absolute;
    left: 10px;
    color: var(--primary-color);
    font-size: 1.2rem;
}

.legal-info {
    line-height: 1.7;
}

.legal-info p {
    margin-bottom: 20px;
    color: var(--text-dark);
}

.payment-methods {
    margin: 30px 0;
    text-align: center;
}

.payment-methods h4 {
    color: var(--text-dark);
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}

.payment-icons {
    display: flex;
    justify-content: center;
    gap: 25px;
    font-size: 2.5rem;
    color: var(--text-light);
    margin-top: 15px;
}

.payment-icons i {
    transition: all 0.3s;
}

.payment-icons i:hover {
    color: var(--primary-color);
    transform: translateY(-3px);
}

.support-info {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
    margin: 25px 0;
}

.support-card {
    background: white;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-medium);
    padding: 25px;
    text-align: center;
    transition: all 0.3s;
    position: relative;
    overflow: hidden;
}

.support-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-medium);
    border-color: var(--primary-color);
}

.support-card i {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 15px;
    display: block;
}

.support-card h4 {
    color: var(--text-dark);
    margin: 0 0 10px 0;
    font-size: 1.2rem;
}

.support-card p {
    color: var(--text-light);
    margin: 5px 0;
    line-height: 1.5;
    font-size: 0.95rem;
}

.support-card strong {
    color: var(--text-dark);
    font-weight: 600;
}

.response-time {
    background: linear-gradient(135deg, rgba(76, 175, 80, 0.05) 0%, rgba(76, 175, 80, 0.02) 100%);
    border: 1px solid rgba(76, 175, 80, 0.1);
    border-radius: var(--radius-medium);
    padding: 20px;
    margin-top: 30px;
}

.response-time h4 {
    color: var(--success-color);
    margin-bottom: 15px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.response-time ul {
    list-style-type: none;
    padding-left: 0;
}

.response-time li {
    margin-bottom: 12px;
    padding-left: 25px;
    position: relative;
    color: var(--text-dark);
    line-height: 1.6;
}

.response-time li:before {
    content: "✓";
    position: absolute;
    left: 5px;
    color: var(--success-color);
    font-weight: bold;
}

.response-time strong {
    color: var(--text-dark);
    font-weight: 600;
}

/* Адаптивность для страницы контактов */
@media (max-width: 768px) {
    .support-info {
        grid-template-columns: 1fr;
        gap: 15px;
    }
    
    .support-card {
        padding: 20px;
    }
    
    .contact-card {
        padding: 15px;
    }
    
    .contact-icon {
        width: 40px;
        height: 40px;
        font-size: 1.2rem;
    }
    
    .payment-icons {
        font-size: 2rem;
        gap: 20px;
    }
}

@media (max-width: 576px) {
    .contact-card {
        flex-direction: column;
        text-align: center;
        gap: 15px;
    }
    
    .contact-details h4 {
        font-size: 0.9rem;
    }
    
    .contact-details p {
        font-size: 1rem;
    }
    
    .payment-icons {
        font-size: 1.8rem;
        gap: 15px;
        flex-wrap: wrap;
    }
    
    .support-card {
        padding: 15px;
    }
}


/* Стили для партнерской секции на главной */
.partner-section {
    background: linear-gradient(135deg, rgba(255, 107, 53, 0.05) 0%, rgba(255, 107, 53, 0.02) 100%);
    border: 1px solid rgba(255, 107, 53, 0.1);
    border-radius: var(--radius-medium);
    padding: 20px;
    margin-top: 25px;
    text-align: center;
}

.partner-section h4 {
    color: #FF6B35;
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    font-size: 1.2rem;
}

.partner-section p {
    color: var(--text-light);
    margin-bottom: 15px;
    font-size: 0.95rem;
}

.partner-btn {
    background: linear-gradient(135deg, #FF6B35, #FF9D00);
    color: white;
    border: none;
    padding: 14px 28px;
    border-radius: var(--radius-medium);
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    width: 100%;
}

.partner-btn:hover {
    background: linear-gradient(135deg, #E55A2E, #E58C00);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(255, 107, 53, 0.3);
}


/* Стили для партнерской секции - разные для десктопа и мобильных */
.partner-section-desktop {
    display: block;
    margin-top: 20px;
    background: linear-gradient(135deg, rgba(255, 107, 53, 0.05) 0%, rgba(255, 107, 53, 0.02) 100%);
    border: 1px solid rgba(255, 107, 53, 0.1);
    border-radius: var(--radius-medium);
    padding: 15px;
    text-align: center;
}

.partner-section-mobile {
    display: none;
    margin-top: 20px;
    background: linear-gradient(135deg, rgba(255, 107, 53, 0.05) 0%, rgba(255, 107, 53, 0.02) 100%);
    border: 1px solid rgba(255, 107, 53, 0.1);
    border-radius: var(--radius-medium);
    padding: 15px;
    text-align: center;
}

.partner-section-desktop h4,
.partner-section-mobile h4 {
    color: #FF6B35;
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    font-size: 1.1rem;
}

.partner-section-desktop p,
.partner-section-mobile p {
    color: var(--text-light);
    margin-bottom: 15px;
    font-size: 0.9rem;
}

.partner-btn {
    background: linear-gradient(135deg, #FF6B35, #FF9D00);
    color: white;
    border: none;
    padding: 12px 24px;
    border-radius: var(--radius-medium);
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    width: 100%;
}

.partner-btn:hover {
    background: linear-gradient(135deg, #E55A2E, #E58C00);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(255, 107, 53, 0.3);
}

/* Мобильная версия */
@media (max-width: 768px) {
    .partner-section-desktop {
        display: none;
    }
    
    .partner-section-mobile {
        display: block;
    }
    
    .partner-btn {
        padding: 14px;
    }
}

/* Десктоп версия */
@media (min-width: 769px) {
    .partner-section-desktop {
        display: block;
    }
    
    .partner-section-mobile {
        display: none;
    }
}

/* Стили для адаптивного изображения превью */
.preview-image {
    width: 100%;
    height: 100%;
    object-fit: cover; /* Это подгоняет изображение по размеру контейнера */
    object-position: center; /* Центрирует изображение */
    transition: transform 0.3s ease;
}

/* Стили для партнерских секций - разные для десктопа и мобильных */
.partner-section-desktop {
    display: block;
    margin-top: 20px;
    background: linear-gradient(135deg, rgba(255, 107, 53, 0.05) 0%, rgba(255, 107, 53, 0.02) 100%);
    border: 1px solid rgba(255, 107, 53, 0.1);
    border-radius: var(--radius-medium);
    padding: 15px;
    text-align: center;
}

.partner-section-mobile {
    display: none;
    margin-top: 20px;
    background: linear-gradient(135deg, rgba(255, 107, 53, 0.05) 0%, rgba(255, 107, 53, 0.02) 100%);
    border: 1px solid rgba(255, 107, 53, 0.1);
    border-radius: var(--radius-medium);
    padding: 15px;
    text-align: center;
}

.partner-section-desktop h4,
.partner-section-mobile h4 {
    color: #FF6B35;
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    font-size: 1.1rem;
}

.partner-section-desktop p,
.partner-section-mobile p {
    color: var(--text-light);
    margin-bottom: 15px;
    font-size: 0.9rem;
}

.partner-btn {
    background: linear-gradient(135deg, #FF6B35, #FF9D00);
    color: white;
    border: none;
    padding: 12px 24px;
    border-radius: var(--radius-medium);
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    width: 100%;
}

.partner-btn:hover {
    background: linear-gradient(135deg, #E55A2E, #E58C00);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(255, 107, 53, 0.3);
}

/* Мобильная версия */
@media (max-width: 768px) {
    .partner-section-desktop {
        display: none;
    }
    
    .partner-section-mobile {
        display: block;
    }
    
    .partner-btn {
        padding: 14px;
    }
}

/* Десктоп версия */
@media (min-width: 769px) {
    .partner-section-desktop {
        display: block;
    }
    
    .partner-section-mobile {
        display: none;
    }
}





/* Исправленные стили для видео-превью */

.video-container {
    position: relative;
    width: 100%;
    padding-top: 56.25%; /* Соотношение сторон 16:9 */
    overflow: hidden;
    border-radius: var(--radius-medium);
    box-shadow: var(--shadow-medium);
    background-color: #000;
}

/* Превью и iframe должны абсолютно позиционироваться */
.video-preview,
#vk-video-player-container,
#vk-video-player-container iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

.video-preview {
    cursor: pointer;
    display: flex; /* Используем flex для центрирования */
    align-items: center;
    justify-content: center;
}

.preview-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center;
}

.play-button-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center; /* Центрируем по вертикали и горизонтали */
    background: rgba(0, 0, 0, 0.5);
    transition: background 0.3s ease;
}

.video-preview:hover .play-button-overlay {
    background: rgba(0, 0, 0, 0.7);
}

/* УВЕЛИЧЕННАЯ кнопка воспроизведения */
.play-button {
    background: transparent;
    border: none;
    cursor: pointer;
    font-size: 6rem; /* Увеличено с 5rem */
    color: rgba(255, 255, 255, 0.9);
    transition: all 0.3s ease;
    margin-bottom: 20px;
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 120px; /* Фиксированная ширина */
    height: 120px; /* Фиксированная высота */
}

.play-button:hover {
    color: var(--primary-color);
    transform: scale(1.15); /* Увеличена анимация */
}

.play-button i {
    filter: drop-shadow(0 4px 8px rgba(0, 0, 0, 0.5));
    font-size: 6rem; /* Убедитесь, что иконка большая */
}

.play-text {
    color: white;
    font-size: 1.2rem;
    font-weight: 600;
    text-shadow: 0 2px 6px rgba(0, 0, 0, 0.7);
    text-align: center;
    margin: 0;
    letter-spacing: 0.5px;
}

/* Адаптивность для кнопки */
@media (max-width: 992px) {
    .play-button {
        font-size: 5rem;
        width: 100px;
        height: 100px;
    }
    
    .play-button i {
        font-size: 5rem;
    }
    
    .play-text {
        font-size: 1.1rem;
    }
}

@media (max-width: 768px) {
    .play-button {
        font-size: 4.5rem;
        width: 90px;
        height: 90px;
        margin-bottom: 15px;
    }
    
    .play-button i {
        font-size: 4.5rem;
    }
    
    .play-text {
        font-size: 1rem;
    }
}

@media (max-width: 576px) {
    .play-button {
        font-size: 4rem;
        width: 80px;
        height: 80px;
        margin-bottom: 12px;
    }
    
    .play-button i {
        font-size: 4rem;
    }
    
    .play-text {
        font-size: 0.95rem;
    }
}