:root {
    --primary-dark: #0d1117;
    --primary-color: #161b22;
    --accent-blue: #58a6ff;
    --accent-purple: #b392f0;
    --accent-teal: #39d5ff;
    --text-light: #f0f6fc;
    --text-muted: #8b949e;
    --bg-dark: #0a0d12;
    --bg-darker: #070a0f;
    --card-bg: rgba(22, 27, 34, 0.8);
    --border-color: rgba(240, 246, 252, 0.1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
}

@supports (font-variation-settings: normal) {
    * {
        font-family: 'Inter var', -apple-system, BlinkMacSystemFont, sans-serif;
    }
}

body {
    background-color: var(--bg-dark);
    color: var(--text-light);
    line-height: 1.6;
    background-image: 
        linear-gradient(to bottom, 
            rgba(13, 17, 23, 0.9) 0%, 
            rgba(10, 13, 18, 1) 100%),
        radial-gradient(circle at 20% 30%, 
            rgba(88, 166, 255, 0.05) 0%, 
            transparent 25%),
        radial-gradient(circle at 80% 70%, 
            rgba(179, 146, 240, 0.05) 0%, 
            transparent 25%);
    background-attachment: fixed;
    min-height: 100vh;
}

.knowledge-base {
    max-width: 1400px;
    margin: 0 auto;
    padding: 2rem;
}

.kb-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 2rem 0;
    margin-bottom: 2rem;
    position: relative;
}

.kb-header::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 1px;
    background: linear-gradient(90deg, 
        transparent 0%, 
        var(--border-color) 50%, 
        transparent 100%);
}

.logo {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.logo-icon {
    font-size: 2rem;
    color: var(--accent-blue);
}

.logo-text {
    display: flex;
    flex-direction: column;
}

.logo .main-text {
    font-size: 1.75rem;
    font-weight: 700;
    background: linear-gradient(90deg, var(--accent-blue), var(--accent-teal));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    letter-spacing: -0.5px;
}

.logo .tagline {
    font-size: 0.875rem;
    color: var(--text-muted);
    margin-top: 0.25rem;
    font-weight: 400;
}

.search-container {
    position: relative;
    width: 320px;
}

.search-box {
    width: 100%;
    padding: 0.75rem 1.25rem;
    background: var(--primary-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-light);
    outline: none;
    font-size: 0.95rem;
    transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.search-box:focus {
    border-color: var(--accent-blue);
    box-shadow: 0 0 0 3px rgba(88, 166, 255, 0.2);
}

.search-box::placeholder {
    color: var(--text-muted);
}

.search-btn {
    position: absolute;
    right: 0.5rem;
    top: 50%;
    transform: translateY(-50%);
    background: transparent;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    transition: color 0.2s;
}

.search-btn:hover {
    color: var(--accent-blue);
}

.categories-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(360px, 1fr));
    gap: 1.5rem;
    margin-bottom: 3rem;
}

.category-card {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 1.5rem;
    border: 1px solid var(--border-color);
    transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    position: relative;
    overflow: hidden;
}

.category-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
    border-color: rgba(88, 166, 255, 0.3);
}

.category-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: linear-gradient(to bottom, var(--accent-blue), var(--accent-teal));
}

.category-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1.25rem;
}

.category-icon {
    font-size: 1.5rem;
    color: var(--accent-blue);
}

.category-card h2 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-light);
}

.articles-list {
    list-style: none;
    display: grid;
    gap: 0.75rem;
}

.articles-list li {
    transition: transform 0.2s;
}

.articles-list li:hover {
    transform: translateX(4px);
}

.articles-list a {
    color: var(--text-light);
    text-decoration: none;
    display: flex;
    align-items: center;
    padding: 0.5rem 0;
    font-size: 0.95rem;
    transition: all 0.2s;
    opacity: 0.9;
}

.articles-list a:hover {
    color: var(--accent-blue);
    opacity: 1;
}

.articles-list a::before {
    content: '';
    display: inline-block;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--accent-blue);
    margin-right: 0.75rem;
    transition: all 0.2s;
}

.articles-list a:hover::before {
    transform: scale(1.5);
    margin-right: 1rem;
}

.kb-footer {
    text-align: center;
    padding: 2rem 0;
    color: var(--text-muted);
    font-size: 0.875rem;
    position: relative;
}

.kb-footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 1px;
    background: linear-gradient(90deg, 
        transparent 0%, 
        var(--border-color) 50%, 
        transparent 100%);
}

/* Анимации */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.category-card {
    animation: fadeIn 0.5s ease-out forwards;
    opacity: 0;
}

.category-card:nth-child(1) { animation-delay: 0.1s; }
.category-card:nth-child(2) { animation-delay: 0.2s; }
.category-card:nth-child(3) { animation-delay: 0.3s; }
.category-card:nth-child(4) { animation-delay: 0.4s; }
.category-card:nth-child(5) { animation-delay: 0.5s; }
.category-card:nth-child(6) { animation-delay: 0.6s; }

/* Адаптивность */
@media (max-width: 768px) {
    .kb-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 1.5rem;
    }
    
    .search-container {
        width: 100%;
    }
    
    .categories-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .knowledge-base {
        padding: 1.5rem;
    }
    
    .logo .main-text {
        font-size: 1.5rem;
    }
}