:root{
      --bg:var(--mui-bg-subtle);
      --card:var(--mui-surface);
      --text:var(--mui-text-primary);
      --muted:var(--mui-text-secondary);
      --border:var(--mui-border-default);
      --brand:var(--mui-text-primary);
      --primary:var(--mui-info-600);
      --primary-dark:var(--mui-info-700);
      --primary-soft:var(--mui-info-soft);
      --danger:var(--mui-danger-700);
      --danger-soft:var(--mui-danger-soft);
      --shadow:0 18px 45px rgba(15,23,42,.08);
      --radius:26px;
      --max:1280px;
    }

    *{
      box-sizing:border-box;
    }

    body{
      margin:0;

      font-family:
        Tahoma,
        Arial,
        sans-serif;

      background:
        radial-gradient(
          circle at top right,
          rgba(37,99,235,.08),
          transparent 24%
        ),
        linear-gradient(
          180deg,
          var(--mui-bg-subtle) 0%,
          var(--bg) 100%
        );

      color:var(--text);
      line-height:2;
    }

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

    a:hover{
      text-decoration:underline;
    }

    .container{
      width:100%;
      max-width:var(--max);
      margin:auto;
      padding:0 18px;
    }

    /* =========================
       HEADER
    ========================== */

    .site-header{
      position:sticky;
      top:0;
      z-index:50;

      background:rgba(255,255,255,.88);

      backdrop-filter:blur(12px);

      border-bottom:1px solid rgba(226,232,240,.95);
    }

    .site-header .inner{
      min-height:84px;

      display:flex;
      align-items:center;
      justify-content:space-between;

      gap:16px;
      flex-wrap:wrap;
    }

    .brand{
      display:flex;
      align-items:center;
      gap:14px;

      color:inherit;
    }

    .brand-badge{
      width:50px;
      height:50px;

      border-radius:18px;

      display:grid;
      place-items:center;

      background:
        linear-gradient(
          135deg,
          var(--primary),
          var(--mui-info-600)
        );

      color:var(--mui-surface);

      font-size:22px;
      font-weight:900;

      box-shadow:
        0 12px 25px rgba(37,99,235,.24);
    }

    .brand-text strong{
      display:block;

      font-size:22px;
      color:var(--brand);
    }

    .brand-text span{
      display:block;

      font-size:13px;
      color:var(--muted);
    }

    .nav{
      display:flex;
      align-items:center;
      gap:10px;
      flex-wrap:wrap;
    }

    .nav a{
      padding:11px 16px;

      border-radius:999px;

      color:var(--muted);

      font-size:14px;
      font-weight:800;

      transition:.2s;
    }

    .nav a:hover{
      background:var(--mui-surface);
      color:var(--text);

      text-decoration:none;

      box-shadow:
        0 10px 22px rgba(15,23,42,.07);
    }

    .home-btn{
      background:var(--primary);
      color:var(--mui-surface) !important;
    }

    .home-btn:hover{
      background:var(--primary-dark);
    }

    /* =========================
       PAGE
    ========================== */

    .page{
      padding:40px 0 70px;
    }

    .layout{
      display:grid;
      grid-template-columns:330px 1fr;
      gap:24px;
      align-items:start;
    }

    /* =========================
       SIDE CARD
    ========================== */

    .side-card{

      position:sticky;
      top:115px;

      overflow:hidden;

      border-radius:28px;

      padding:28px;

      color:var(--mui-surface);

      background:
        radial-gradient(
          circle at top left,
          rgba(255,255,255,.20),
          transparent 26%
        ),
        linear-gradient(
          135deg,
          var(--mui-info-600),
          var(--mui-info-600)
        );

      box-shadow:
        0 18px 45px rgba(15,23,42,.12);
    }

    .side-card h2{
      margin:0 0 24px;

      color:var(--mui-surface);

      font-size:38px;
      line-height:1.4;
    }

    .side-list{
      display:flex;
      flex-direction:column;
      gap:14px;
    }

    .side-item{
      background:rgba(255,255,255,.10);

      border:
        1px solid rgba(255,255,255,.16);

      border-radius:18px;

      padding:18px;

      font-size:15px;
      font-weight:700;

      line-height:1.9;

      backdrop-filter:blur(8px);
    }

    /* =========================
       MAIN CARD
    ========================== */

    .card{
      background:var(--card);

      border:
        1px solid var(--border);

      border-radius:28px;

      overflow:hidden;

      box-shadow:var(--shadow);
    }

    .hero{
      padding:38px;

      border-bottom:
        1px solid var(--border);

      background:
        linear-gradient(
          180deg,
          var(--mui-surface) 0%,
          var(--mui-bg-subtle) 100%
        );
    }

    .hero-top{
      display:flex;
      justify-content:space-between;
      gap:18px;
      flex-wrap:wrap;

      margin-bottom:22px;
    }

    .meta{
      font-size:14px;
      color:var(--muted);
    }

    .meta strong{
      display:block;

      margin-bottom:6px;

      color:var(--brand);

      font-size:20px;
    }

    h1{
      margin:0 0 14px;

      color:var(--brand);

      font-size:56px;
      line-height:1.25;
    }

    .subtitle{
      margin:0;

      color:var(--muted);

      font-size:18px;
      line-height:2.2;
    }

    .notice{
      margin-top:26px;

      background:var(--primary-soft);

      border:
        1px solid var(--mui-info-100);

      border-right:
        5px solid var(--primary);

      border-radius:18px;

      padding:18px 20px;

      color:var(--mui-info-700);

      font-size:15px;
      line-height:2;
    }

    .content{
      padding:14px 38px 38px;
    }

    h3{
      margin:42px 0 14px;

      font-size:40px;

      color:var(--brand);

      line-height:1.4;
    }

    p,
    li{
      font-size:18px;
      color:var(--mui-text-primary);
      line-height:2.2;
    }

    ul{
      margin:10px 0 0;
      padding-right:24px;
    }

    li{
      margin-bottom:10px;
    }

    .warning{
      margin-top:28px;

      background:var(--danger-soft);

      border:
        1px solid var(--mui-danger-100);

      border-right:
        5px solid var(--danger);

      border-radius:18px;

      padding:18px 20px;

      color:var(--mui-danger-700);

      font-size:15px;
      line-height:2;
    }

    .footer{
      margin-top:38px;

      padding-top:24px;

      border-top:
        1px solid var(--border);

      display:flex;
      align-items:center;
      justify-content:space-between;

      gap:14px;
      flex-wrap:wrap;

      color:var(--muted);

      font-size:14px;
    }

    .footer-links{
      display:flex;
      gap:10px;
      flex-wrap:wrap;
    }

    /* =========================
       MOBILE
    ========================== */

    @media(max-width:980px){

      .layout{
        grid-template-columns:1fr;
      }

      .side-card{
        position:relative;
        top:0;
      }
    }

    @media(max-width:700px){

      h1{
        font-size:38px;
      }

      h3{
        font-size:30px;
      }

      .hero,
      .content{
        padding-inline:22px;
      }

      .site-header .inner{
        justify-content:center;
        text-align:center;
      }

      .brand{
        justify-content:center;
      }

      .footer{
        flex-direction:column;
        align-items:flex-start;
      }
    }