/* Variables */
:root {
    --background-primary: #ffffff;
    --background-secondary: #f0f0f0;
    --background-hover: #e8e8e8;
    --primary-color: #0078d4;
    --text-primary: #333333;
    --border-color: #dddddd;
    --radius-md: 4px;
    --radius-lg: 6px;
    --transition-normal: 0.3s ease;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 2px 4px rgba(0, 0, 0, 0.1);
    --container-max-width: 1200px;
    --container-padding: 20px;
    --font-weight-medium: 500;
    --radius-sm: 4px;
    --products-title-color: #0078d4;
    --card-shadow: 0 2px 4px rgba(0, 0, 0, 0.08);
    --card-hover-shadow: 0 4px 12px rgba(0, 0, 0, 0.12);
    --transition-default: 0.3s ease;
}

/* Container */
.container {
    max-width: var(--container-max-width);
    width: 95%;
    margin: 0 auto;
    padding: var(--container-padding);
    background: var(--background-primary);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
}

/* Main Navigation */
.main-nav ul {
    display: flex;
    list-style: none;
    padding: 0;
    margin: 0 0 2rem 0;
    gap: 0.75rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 1rem;
}

.main-nav a {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 500;
    border-radius: var(--radius-md);
    transition: background-color var(--transition-normal);
}

.main-nav a:hover {
    background-color: var(--background-secondary);
    color: var(--primary-color);
}

/* Tabs Navigation */
.downloads-tabs {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
    overflow-x: auto;
    padding-bottom: 0.5rem;
    scrollbar-width: thin;
}

.downloads-tabs::-webkit-scrollbar {
    height: 4px;
}

/* Tab Buttons */
.tab-button {
    white-space: nowrap;
    min-width: 120px;
    padding: 0.6rem 1rem;
}

.tab-button:hover {
    transform: none;
}

.tab-button.active {
    background-color: transparent;
    color: var(--primary-color);
    font-weight: 500;
    border-color: transparent;
    position: relative;
}

.tab-button .icon {
    width: 20px;
    height: 20px;
}

/* Specific styling for Autodesk tab icon */
.tab-button[data-tab="autodesk-tab"] .icon {
    width: 24px;
    height: 24px;
    color: var(--primary-color);
}

/* Tab Content */
.tab-content {
    display: none;
    opacity: 0;
    transition: opacity 0.3s;
    margin-bottom: 2rem;
}

.tab-content.active {
    display: block;
    opacity: 1;
    animation: fadeInUp 0.4s forwards;
}

/* Download Section */
.download-section {
    margin-bottom: 2.5rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

.download-section:last-child {
    border-bottom: none;
}

.section-header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 1.5rem;
}

.section-icon {
    width: 24px;
    height: 24px;
    color: var(--primary-color);
}

/* Download Cards Grid */
.downloads-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 1.5rem;
}

/* Download Card */
.download-card {
    padding: 1.25rem;
    background: var(--background-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    transition: box-shadow var(--transition-normal), transform var(--transition-normal);
}

.download-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.card-header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 1rem;
}

.card-icon {
    width: 32px;
    height: 32px;
}

.card-title {
    font-size: var(--font-size-lg);
    font-weight: 500;
    margin: 0;
    color: var(--text-primary);
}

/* Product Icons */
.product-icons {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin: 0.75rem 0 1rem 0;
}

.product-icons img {
    width: 30px;
    height: 30px;
    transition: transform var(--transition-fast);
    object-fit: contain;
}

.product-icons img:hover {
    transform: scale(1.1);
}

/* Download Buttons */
.download-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-top: 1rem;
}

/* Button Fixes */
.download-button {
    /* Здесь идут только специфичные стили для кнопок загрузок */
    min-width: 140px;
    margin: 0.25rem;
}

/* Состояние загрузки */
.download-button.loading {
    position: relative;
    pointer-events: none;
    color: transparent !important;
}

.download-button.loading::after {
    content: '';
    position: absolute;
    width: 16px;
    height: 16px;
    top: 50%;
    left: 50%;
    margin-top: -8px;
    margin-left: -8px;
    border-radius: 50%;
    border: 2px solid rgba(255, 255, 255, 0.5);
    border-top-color: white;
    animation: spin 0.8s linear infinite;
}

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

/* Message Container */
.message-container {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: var(--z-tooltip);
    width: 300px;
    max-width: calc(100% - 40px);
}

.message {
    padding: 1rem;
    margin-bottom: 1rem;
    border-radius: var(--radius-md);
    background: white;
    box-shadow: var(--shadow-md);
    animation: slideIn 0.3s forwards;
    position: relative;
    border-left: 4px solid var(--border-color);
}

.message.info {
    border-left-color: var(--info-color);
}

.message.error {
    border-left-color: var(--error-color);
}

.message.success {
    border-left-color: var(--success-color);
}

.message.fade-out {
    animation: fadeOut 0.5s forwards;
}

@keyframes slideIn {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

@keyframes fadeOut {
    from {
        transform: translateX(0);
        opacity: 1;
    }
    to {
        transform: translateX(100%);
        opacity: 0;
    }
}

/* Mobile Optimizations */
@media (max-width: 768px) {
    .container {
        width: 98%;
        padding: 1.5rem;
    }
    
    .downloads-tabs {
        padding-bottom: 0.75rem;
    }
    
    .tab-button {
        min-width: 110px;
        padding: 0.5rem 0.8rem;
    }
    
    .downloads-grid {
        grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    }
    
    .download-card {
        padding: 1rem;
    }

    .download-buttons {
        justify-content: center;
    }
    
    .download-button {
        min-width: auto;
        padding: 0.5rem 0.8rem;
    }
    
    .main-nav ul {
        gap: 0.5rem;
    }
    
    .main-nav a {
        padding: 0.4rem 0.8rem;
    }
    
    .message-container {
        width: 280px;
    }
}

/* Additional styles for very small devices */
@media (max-width: 480px) {
    .download-buttons {
        justify-content: stretch;
    }
    
    .download-button {
        flex: 1 1 auto;
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}