:root{
      --bg: #0b1220;
      --text: #e8eefc;
      --muted:#a8b3cf;
      --line: rgba(255,255,255,.12);
      --accent:#5b8cff;
      --accent2:#2dd4bf;
      --radius: 14px;
      --shadow: 0 10px 30px rgba(0,0,0,.35);
      --max: 1100px;
    }

    *{ box-sizing:border-box; }
    html{ scroll-behavior:smooth; }
    body{
      margin:0;
      font-family: system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
      background: radial-gradient(1200px 800px at 20% 0%, rgba(91,140,255,.25), transparent 60%),
                  radial-gradient(900px 600px at 80% 10%, rgba(45,212,191,.18), transparent 55%),
                  var(--bg);
      color:var(--text);
      line-height:1.6;
    }

    a{ color:inherit; text-decoration:none; }
    a:hover{ text-decoration:underline; }

    .container{
      width: min(100% - 32px, var(--max));
      margin-inline:auto;
    }

    /* Header */
    header{
      position: sticky;
      top: 0;
      z-index: 50;
      backdrop-filter: blur(10px);
      background: rgba(11, 18, 32, .75);
      border-bottom: 1px solid var(--line);
    }

    .topbar{
      display:flex;
      align-items:center;
      justify-content:space-between;
      gap:16px;
      padding: 14px 0;
    }

    .brand{
      display:flex;
      align-items:center;
      gap:12px;
      min-width: 220px;
    }

    .logo{
      width: 44px;
      height: 44px;
      border-radius: 12px;
      background: linear-gradient(135deg, rgba(91,140,255,.9), rgba(45,212,191,.85));
      box-shadow: var(--shadow);
      display:grid;
      place-items:center;
      overflow:hidden;
      flex: 0 0 auto;
    }

    .logo img{
      width:100%;
      height:100%;
      object-fit:cover;
      display:block;
    }

    .site-title{
      display:flex;
      flex-direction:column;
      gap:2px;
    }
    .site-title strong{ font-size: 16px; letter-spacing:.2px; }
    .site-title span{ font-size: 13px; color: var(--muted); }

    /* Menu: строго в ряд + dropdown 2 уровня */
    nav{ display:flex; }

    nav > ul{
      list-style:none;
      margin:0;
      padding:0;

      display:flex !important;
      flex-direction: row !important; /* ключевое */
      align-items:center;
      justify-content:flex-end;
      gap: 14px;

      flex-wrap: nowrap;
      white-space: nowrap;
      overflow-x: auto; /* если пунктов много — скролл по X */
      -webkit-overflow-scrolling: touch;
    }

    nav > ul > li{
      position:relative;
      flex: 0 0 auto;
    }

    nav a{
      display:inline-flex;
      align-items:center;
      gap:8px;
      padding: 10px 12px;
      border-radius: 10px;
      border: 1px solid transparent;
      color: var(--text);
      font-weight: 600;
      font-size: 14px;
      width:auto;
    }

    nav a:hover{
      border-color: var(--line);
      background: rgba(255,255,255,.04);
      text-decoration:none;
    }

    /* Dropdown */
    .has-submenu > a::after{
      content:"▾";
      font-size: 12px;
      opacity:.8;
    }

    .submenu{
      position:absolute;
      top: calc(100% + 8px);
      right:0;
      min-width: 220px;
      background: rgba(17,26,46,.98);
      border: 1px solid var(--line);
      border-radius: 12px;
      box-shadow: var(--shadow);
      padding: 8px;
      display:none;
      margin:0;
      list-style:none;
    }

    .submenu li a{
      width:100%;
      padding: 10px 10px;
      border-radius: 10px;
      font-weight: 600;
      white-space: normal;
    }

    .has-submenu:hover .submenu,
    .has-submenu:focus-within .submenu{
      display:block;
    }

    /* Hero */
    .hero{ padding: 34px 0 20px; }
    .hero-card{
      background: linear-gradient(180deg, rgba(255,255,255,.06), rgba(255,255,255,.03));
      border: 1px solid var(--line);
      border-radius: var(--radius);
      box-shadow: var(--shadow);
      padding: 26px;
      display:grid;
      grid-template-columns: 1.2fr .8fr;
      gap: 18px;
      align-items:center;
    }
    h1{
      margin:0 0 8px;
      font-size: clamp(28px, 4vw, 44px);
      line-height:1.15;
      letter-spacing: -0.6px;
    }
    .lead{
      margin:0 0 18px;
      color: var(--muted);
      font-size: 16px;
    }

    .cta-row{
      display:flex;
      gap:12px;
      flex-wrap:wrap;
      align-items:center;
    }

    .btn{
      display:inline-flex;
      align-items:center;
      justify-content:center;
      padding: 12px 16px;
      border-radius: 12px;
      border: 1px solid transparent;
      font-weight: 800;
      letter-spacing:.2px;
      cursor:pointer;
      user-select:none;
    }
    .btn-primary{
      background: linear-gradient(135deg, var(--accent), var(--accent2));
      color: #081022;
      box-shadow: 0 10px 25px rgba(91,140,255,.18);
    }
    .btn-secondary{
      border-color: var(--line);
      background: rgba(255,255,255,.04);
      color: var(--text);
    }

    .hero-aside{
      border-left: 1px solid var(--line);
      padding-left: 18px;
      color: var(--muted);
      font-size: 14px;
    }

    /* Main layout */
    main{ padding: 18px 0 60px; }

    .grid{
      display:grid;
      grid-template-columns: 300px 1fr;
      gap: 18px;
      align-items:start;
    }

    /* TOC */
    .toc{
      position: sticky;
      top: 86px;
      background: rgba(17,26,46,.8);
      border: 1px solid var(--line);
      border-radius: var(--radius);
      padding: 16px;
      box-shadow: var(--shadow);
    }
    .toc h2{
      margin:0 0 10px;
      font-size: 14px;
      text-transform: uppercase;
      letter-spacing: .12em;
      color: var(--muted);
    }
    .toc ol{
      margin:0;
      padding-left: 18px;
      display:flex;
      flex-direction:column;
      gap:8px;
    }
    .toc a{
      color: var(--text);
      font-size: 14px;
      opacity:.92;
    }

    /* Content */
    article{
      background: rgba(17,26,46,.55);
      border: 1px solid var(--line);
      border-radius: var(--radius);
      padding: 22px;
      box-shadow: var(--shadow);
    }
    article h2{
      margin: 18px 0 10px;
      font-size: 26px;
      letter-spacing: -0.2px;
    }
    article h3{
      margin: 16px 0 8px;
      font-size: 18px;
      color: #dbe6ff;
    }
    p{ margin: 0 0 12px; }
    .muted{ color: var(--muted); }

    ul{
      margin: 0 0 12px;
      padding-left: 18px;
      display:flex;
      flex-direction:column;
      gap:6px;
    }

    /* Read more */
    .read-more{
      display:inline-flex;
      align-items:center;
      gap:8px;
      margin-top: 6px;
      font-weight: 800;
      color: var(--accent2);
    }
    .read-more::after{ content:"→"; }

    /* Center image */
    figure{
      margin: 18px auto;
      max-width: 760px;
      text-align:center;
    }
    figure img{
      width:100%;
      height:auto;
      border-radius: 14px;
      border: 1px solid var(--line);
      box-shadow: var(--shadow);
      display:block;
    }
    figcaption{
      margin-top: 8px;
      font-size: 13px;
      color: var(--muted);
    }

    /* Tables */
    .table-wrap{
      overflow:auto;
      border-radius: 12px;
      border: 1px solid var(--line);
      margin: 14px 0;
    }
    table{
      width:100%;
      border-collapse: collapse;
      min-width: 520px;
      background: rgba(0,0,0,.12);
    }
    th, td{
      padding: 12px 12px;
      border-bottom: 1px solid var(--line);
      text-align:left;
      vertical-align: top;
      font-size: 14px;
    }
    th{
      background: rgba(255,255,255,.05);
      color: #eaf1ff;
      font-size: 13px;
      text-transform: uppercase;
      letter-spacing: .08em;
    }
    tr:last-child td{ border-bottom:none; }

    /* FAQ */
    .faq{
      margin-top: 12px;
      display:flex;
      flex-direction:column;
      gap:10px;
    }
    details{
      border: 1px solid var(--line);
      border-radius: 12px;
      background: rgba(255,255,255,.03);
      padding: 10px 12px;
    }
    summary{
      cursor:pointer;
      font-weight: 900;
      list-style:none;
    }
    summary::-webkit-details-marker{ display:none; }
    details[open]{ background: rgba(255,255,255,.05); }
    details p{ margin: 10px 0 0; color: var(--muted); }

    /* Reviews */
    .reviews{
      display:grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 12px;
      margin-top: 10px;
    }
    .review{
      border: 1px solid var(--line);
      border-radius: 14px;
      background: rgba(255,255,255,.03);
      padding: 14px;
    }
    .review-head{
      display:flex;
      justify-content:space-between;
      gap:10px;
      align-items:baseline;
      margin-bottom: 8px;
    }
    .review-name{ font-weight: 900; }
    .review-date{ color: var(--muted); font-size: 13px; }
    .review p{ margin:0; color: var(--muted); }

    /* Similar articles */
    .cards{
      display:grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 12px;
      margin-top: 10px;
    }
    .card{
      border: 1px solid var(--line);
      border-radius: 16px;
      background: rgba(255,255,255,.03);
      overflow:hidden;
      display:flex;
      flex-direction:column;
    }
    .card img{
      width:100%;
      height: 150px;
      object-fit: cover;
      display:block;
      border-bottom: 1px solid var(--line);
    }
    .card-body{
      padding: 12px;
      display:flex;
      flex-direction:column;
      gap:6px;
    }
    .card-title{
      margin:0;
      font-size: 16px;
      letter-spacing: -0.2px;
    }
    .card-text{
      margin:0;
      color: var(--muted);
      font-size: 13px;
    }

    footer{
      border-top: 1px solid var(--line);
      color: var(--muted);
      padding: 18px 0 30px;
    }

    @media (max-width: 900px){
      .hero-card{ grid-template-columns: 1fr; }
      .hero-aside{
        border-left:none;
        padding-left:0;
        border-top:1px solid var(--line);
        padding-top:12px;
      }
      .grid{ grid-template-columns: 1fr; }
      .toc{ position:relative; top:auto; }
      .reviews, .cards{ grid-template-columns: 1fr; }
    }