:root {
            --primary-color: #8bc34a; 
            --primary-dark: #689f38;
            --bg-color: #f1f8e9;
            --surface-color: #ffffff;
            --text-primary: #212121;
            --text-secondar: #757575;
            --header-text: #ffffff;
            --link-color: #689f38;
        }
        body.chernaya-temka {
            --bg-color: #121212;      
            --surface-color: #1e1e1e; 
            --text-primary: #e1e1e1;
            --header-text: #000000;
            --link-color: #8bc34a;
        }
        html, body {
            height: 100%;
            margin: 0;
        }
        body {
            font-family: 'Roboto', sans-serif;
            background-color: var(--bg-color);
            color: var(--text-primary);
            transition: background-color 0.3s, color 0.3s;
            display: flex;
            flex-direction: column;
        }
        header {
            background-color: var(--primary-color);
            color: var(--header-text);
            height: 64px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 0 24px;
            position: fixed;
            top: 0;
            width: 100%;
            box-sizing: border-box;
            z-index: 1000;
        }
        main {
            flex: 1 0 auto; 
            display: block;
        }
        .container {
            max-width: 800px;
            margin: 100px 0 40px 24px; 
            padding-right: 24px;
            box-sizing: border-box;
        }
        .card {
            background: var(--surface-color);
            border-radius: 3px;
            padding: 24px;
            margin-bottom: 24px;
        }
        .avatar {
            width: 80px;
            height: 80px;
            background-color: var(--primary-color);
            border-radius: 50%;
            margin-bottom: 16px;
            overflow: hidden;
            display: flex;
            align-items: center;
            justify-content: center;
        }
        .imgavatar {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }
        h2 { margin: 0; color: var(--primary-color); font-size: 1.5rem; }
        h3 { margin: 0 0 16px 0; font-weight: 500; }
        .ssilka {
            color: var(--link-color);
            text-decoration: none;
            font-weight: 500;
            transition: opacity 0.2s;
        }
        .ssilka:hover {
            text-decoration: underline;
            opacity: 0.8;
        }
        .hui {
            background: rgba(255,255,255,0.2);
            border: 1px solid rgba(255,255,255,0.3);
            color: inherit;
            padding: 6px 12px;
            border-radius: 4px;
            cursor: pointer;
            text-transform: uppercase;
            font-size: 11px;
            font-weight: 500;
        }
        footer {
            flex-shrink: 0;
            background-color: var(--surface-color);
            padding: 30px 24px;
            border-top: 1px solid rgba(0,0,0,0.1);
        }
        .poparait {
            color: var(--text-secondar);
            font-size: 13px;
        }
        @media (max-width: 600px) {
            header { padding: 0 16px; }
            .container {
                margin: 80px auto 40px auto; 
                padding: 0 16px;
                width: 100%;
            }
            .card { padding: 16px; }
            footer { padding: 24px 16px; text-align: center; }
        }