*, *::before, *::after { box-sizing: border-box; }

        :root {
            --primary: #2c73a6;
            --primary-dark: #1f5380;
            --primary-light: #e8f1f8;
            --text: #2b3a47;
            --muted: #5f7080;
            --bg: #f4f7fa;
            --white: #ffffff;
            --radius: 12px;
            --shadow: 0 6px 24px rgba(44, 115, 166, 0.12);
        }

        html { scroll-behavior: smooth; }

        body {
            margin: 0;
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
            line-height: 1.7;
            color: var(--text);
            background: var(--bg);
            -webkit-font-smoothing: antialiased;
        }

        /* Header */
        .site-header {
            background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 100%);
            color: var(--white);
            padding: 56px 20px 64px;
            text-align: center;
            position: relative;
        }

        .site-header::after {
            content: "";
            position: absolute;
            left: 0; right: 0; bottom: -1px;
            height: 24px;
            background: var(--bg);
            border-radius: 24px 24px 0 0;
        }

        .site-header .brand {
            font-size: 0.95rem;
            letter-spacing: 0.18em;
            text-transform: uppercase;
            opacity: 0.85;
            margin: 0 0 12px;
        }

        h1 {
            margin: 0 auto;
            max-width: 900px;
            font-size: clamp(1.8rem, 4.5vw, 3rem);
            line-height: 1.2;
            font-weight: 700;
            color: var(--white);
        }

        /* Layout */
        .container {
            width: 100%;
            max-width: 960px;
            margin: 0 auto;
            padding: 0 20px;
        }

        main { padding: 32px 0 48px; }

        /* Article */
        article {
            background: var(--white);
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            padding: clamp(22px, 4vw, 44px);
            margin-bottom: 28px;
            border-top: 4px solid var(--primary);
            overflow-wrap: break-word;
        }

        article h2, article h3, article h4 {
            color: var(--primary-dark);
            line-height: 1.3;
            margin: 1.6em 0 0.6em;
        }

        article h2 { font-size: 1.6rem; }
        article h3 { font-size: 1.3rem; }
        article h4 { font-size: 1.1rem; }
        article > :first-child { margin-top: 0; }
        article p { margin: 0 0 1.1em; }
        article a { color: var(--primary); }
        article ul, article ol { padding-left: 1.4em; }
        article img { max-width: 100%; height: auto; border-radius: 8px; }

        /* Transition section */
        .transition {
            background: var(--primary-light);
            border-left: 4px solid var(--primary);
            border-radius: var(--radius);
            padding: clamp(20px, 3.5vw, 32px);
            margin-bottom: 28px;
            overflow-wrap: break-word;
        }

        .transition p { margin: 0 0 1em; }
        .transition p:last-child { margin-bottom: 0; }

        /* Links block */
        .links-block {
            background: var(--white);
            border: 1px solid #d5e3ef;
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            padding: clamp(20px, 3.5vw, 36px);
        }

        .links-block h3 {
            margin: 1.6em 0 0.7em;
            padding-bottom: 8px;
            font-size: 1.2rem;
            color: var(--primary-dark);
            border-bottom: 2px solid var(--primary-light);
        }

        .links-block h3:first-child { margin-top: 0; }

        .links-block ul {
            list-style: none;
            margin: 0;
            padding: 0;
            columns: 2;
            column-gap: 40px;
        }

        .links-block li {
            break-inside: avoid;
            padding: 6px 0 6px 18px;
            position: relative;
            overflow-wrap: anywhere;
        }

        .links-block li::before {
            content: "";
            position: absolute;
            left: 0;
            top: 1.05em;
            width: 7px;
            height: 7px;
            border-radius: 50%;
            background: var(--primary);
        }

        .links-block a {
            color: var(--primary);
            text-decoration: none;
        }

        .links-block a:hover, .links-block a:focus {
            color: var(--primary-dark);
            text-decoration: underline;
        }

        /* Footer */
        .site-footer {
            background: var(--primary-dark);
            color: rgba(255, 255, 255, 0.9);
            text-align: center;
            padding: 28px 20px;
            font-size: 0.95rem;
        }

        .site-footer p { margin: 0; }

        @media (max-width: 640px) {
            .site-header { padding: 40px 16px 52px; }
            .container { padding: 0 14px; }
            main { padding: 20px 0 32px; }
            .links-block ul { columns: 1; }
        }