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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: #1a1a1a;
    background: #ffffff;
    min-height: 100vh;
}

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

.main-content {
    background: #ffffff;
    border-radius: 12px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    padding: 40px;
    border: 1px solid #e5e5e5;
}

.header {
    text-align: center;
    margin-bottom: 20px;
}

.title {
    font-size: 2.8rem;
    font-weight: 700;
    color: #1a1a1a;
    margin-bottom: 4px;
    letter-spacing: -0.02em;
}

.subtitle {
    font-size: 1.2rem;
    color: #666666;
    font-weight: 400;
    margin-bottom: 20px;
}

.language-tabs {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin: 5px 0;
}

.tab-button {
    padding: 10px 20px;
    border: 1px solid #e5e5e5;
    background: #ffffff;
    color: #666666;
    border-radius: 6px;
    cursor: pointer;
    font-weight: 500;
    transition: all 0.2s ease;
    font-size: 14px;
}

.tab-button:hover {
    background: #f5f5f5;
    transform: scale(1.02);
    border-color: #d0d0d0;
}

.tab-button.active {
    background: #000000;
    color: #ffffff;
    border-color: #000000;
}

.description {
    background: #f8f9fa;
    border-radius: 6px;
    margin: 15px 0;
    border: 1px solid #e5e5e5;
}

.description p {
    font-size: 1.1rem;
    margin-bottom: 8px;
    text-align: center;
}

.lang-content {
    display: none;
}

.lang-content.active {
    display: block;
}

.books-section {
    margin: 12px 0;
}

.section-title {
    font-size: 2.2rem;
    color: #1a1a1a;
    text-align: center;
    margin-bottom: 12px;
    font-weight: 600;
    letter-spacing: -0.01em;
}

.books-grid {
    display: block;
    margin: 30px 0;
}

.book-item {
    background: #ffffff;
    padding: 12px 20px;
    margin-bottom: 8px;
    border-radius: 6px;
    border: 1px solid #e5e5e5;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    cursor: pointer;
}

.book-item:hover {
    transform: scale(1.02);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    border-color: #d0d0d0;
    background: #f8f9fa;
}

.book-item a {
    text-decoration: none;
    color: #1a1a1a;
    font-size: 1rem;
    font-weight: 500;
    display: flex;
    align-items: center;
    width: 100%;
    height: 100%;
}

.book-item a:before {
    content: '📖';
    margin-right: 12px;
    font-size: 1.1rem;
}

.book-item:active {
    transform: scale(0.98);
    transition: transform 0.1s;
}

.subscription-section {
    background: #1a1a1a;
    color: white;
    padding: 8px;
    border-radius: 6px;
    margin: 8px 0;
}

.subscription-panels {
    display: flex;
    align-items: stretch;
    gap: 0;
    height: 100%;
}

.subscription-panel {
    padding: 16px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.rss-panel {
    flex: 0 0 40%;
    text-align: center;
}

.email-panel {
    flex: 0 0 60%;
    text-align: center;
}

.subscription-divider {
    width: 1px;
    background: linear-gradient(to bottom, transparent, rgba(255,255,255,0.3), transparent);
    margin: 8px 0;
    position: relative;
}

.subscription-divider::before {
    content: '';
    position: absolute;
    left: -1px;
    top: 25%;
    bottom: 25%;
    width: 3px;
    background: linear-gradient(to bottom, transparent, rgba(255,255,255,0.1), transparent);
    border-radius: 2px;
}

.subscription-title {
    font-size: 1.2rem;
    margin-bottom: 5px;
    font-weight: 600;
}

.subscription-options {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin-top: 5px;
    flex-wrap: wrap;
}

.subscription-button {
    background: rgba(255,255,255,0.1);
    color: white;
    padding: 12px 24px;
    border: 1px solid rgba(255,255,255,0.3);
    border-radius: 6px;
    text-decoration: none;
    font-weight: 500;
    font-size: 1rem;
    transition: all 0.2s ease;
}

.subscription-button:hover {
    background: rgba(255,255,255,0.2);
    transform: scale(1.05);
    border-color: rgba(255,255,255,0.5);
}

.contact-form {
    background: white;
    padding: 30px;
    border-radius: 8px;
    margin-top: 30px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: #1a1a1a;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px;
    border: 1px solid #e5e5e5;
    border-radius: 6px;
    font-size: 1rem;
    transition: border-color 0.2s ease;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: #000000;
    box-shadow: 0 0 0 2px rgba(0, 0, 0, 0.1);
}

.submit-btn {
    background: #000000;
    color: white;
    padding: 12px 24px;
    border: none;
    border-radius: 6px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
}

.submit-btn:hover {
    background: #333333;
    transform: scale(1.02);
}

.submit-btn:active {
    transform: scale(0.98);
}

.footer {
    text-align: center;
    margin-top: 40px;
    padding-top: 20px;
    border-top: 1px solid #e5e5e5;
    color: #666666;
    font-size: 0.9rem;
}

.progress-indicator {
    background: #e5e5e5;
    height: 8px;
    border-radius: 4px;
    margin: 5px 0;
    overflow: hidden;
}

.progress-bar {
    background: #1a1a1a;
    height: 100%;
    width: 15%;
    border-radius: 4px;
    transition: width 0.5s ease;
}

.progress-text {
    text-align: center;
    color: #666666;
    font-size: 0.9rem;
}


@media (max-width: 768px) {
    .title {
        font-size: 2.5rem;
    }
    
    .main-content {
        padding: 20px;
    }
    
    .subscription-options {
        flex-direction: column;
        align-items: center;
    }
    
    .language-tabs {
        flex-wrap: wrap;
    }
    
    .subscription-panels {
        flex-direction: column;
    }
    
    .subscription-divider {
        width: 100%;
        height: 1px;
        background: linear-gradient(to right, transparent, rgba(255,255,255,0.3), transparent);
        margin: 16px 0;
    }
    
    .subscription-divider::before {
        display: none;
    }
}