* {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }

    body {
      font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
      /* Ещё более тёмный фон: сверху чуть светлее, книзу почти чёрный */
      background: linear-gradient(180deg, #044706 0%, #033305 40%, #011a02 100%);
      background-attachment: fixed;
      color: #fff;
      line-height: 1.7;
      min-height: 100vh;
    }

    .conteiner {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
    }

    /* ---------- HEADER ---------- */
    header {
      background: rgba(0, 0, 0, 0.55);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(255, 215, 0, 0.25);
      position: sticky;
      top: 0;
      z-index: 100;
    }

    .header_conteiner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 15px 20px;
      flex-wrap: wrap;
      gap: 15px;
    }

    .header_logo img.logo {
      height: 48px;
      width: auto;
    }

    .header_button {
      display: flex;
      gap: 12px;
      flex-wrap: wrap;
    }

    .btn {
      display: inline-block;
      padding: 12px 28px;
      font-size: 1rem;
      font-weight: 700;
      text-decoration: none;
      border-radius: 50px;
      transition: all 0.3s ease;
      cursor: pointer;
      border: none;
      text-align: center;
      white-space: nowrap;
    }

    .button_1 {
      background: linear-gradient(135deg, #ffd700, #ff8c00);
      color: #011a02;
      box-shadow: 0 4px 15px rgba(255, 140, 0, 0.45);
    }

    .button_1:hover {
      transform: translateY(-3px);
      box-shadow: 0 8px 25px rgba(255, 140, 0, 0.7);
    }

    .button_2 {
      background: linear-gradient(135deg, #00c6ff, #0072ff);
      color: #fff;
      box-shadow: 0 4px 15px rgba(0, 114, 255, 0.45);
    }

    .button_2:hover {
      transform: translateY(-3px);
      box-shadow: 0 8px 25px rgba(0, 114, 255, 0.7);
    }

    .glowing {
      animation: glow 2s ease-in-out infinite alternate;
    }

    @keyframes glow {
      from { box-shadow: 0 4px 15px rgba(255, 140, 0, 0.45); }
      to   { box-shadow: 0 4px 30px rgba(255, 215, 0, 0.9); }
    }

    /* ---------- NAV CARDS ---------- */
    .nav_cards {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
      gap: 18px;
      margin: 40px 0 50px;
    }

    .nav_card {
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 10px;
      padding: 25px 15px;
      background: rgba(0, 0, 0, 0.5);
      border: 1px solid rgba(255, 215, 0, 0.25);
      border-radius: 18px;
      text-decoration: none;
      color: #fff;
      transition: all 0.3s ease;
      backdrop-filter: blur(8px);
    }

    .nav_card:hover {
      transform: translateY(-6px);
      border-color: #ffd700;
      background: rgba(0, 0, 0, 0.65);
      box-shadow: 0 12px 30px rgba(0, 0, 0, 0.6);
    }

    .nav_card .icon {
      font-size: 2rem;
    }

    .nav_card span.title {
      font-weight: 700;
      font-size: 1.05rem;
      color: #ffd700;
    }

    .nav_card span.desc {
      font-size: 0.8rem;
      color: #a9d0a9;
      text-align: center;
    }

    /* ---------- HERO ---------- */
    .main_conteiner {
      padding-bottom: 60px;
    }

    .main h1 {
      font-size: 2.6rem;
      margin: 20px 0 25px;
      text-align: center;
      background: linear-gradient(90deg, #ffd700, #ff8c00);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      text-shadow: 0 2px 20px rgba(0, 0, 0, 0.5);
    }

    .hero_img {
      display: block;
      max-width: 100%;
      border-radius: 20px;
      margin: 0 auto 35px;
      box-shadow: 0 15px 40px rgba(0, 0, 0, 0.7);
      border: 2px solid rgba(255, 215, 0, 0.35);
    }

    .main_text p,
    .main p,
    .main li {
      color: #bfdcbf;
      margin-bottom: 14px;
      font-size: 1.05rem;
    }

    .main h2 {
      font-size: 1.7rem;
      color: #ffd700;
      margin: 35px 0 15px;
      padding-left: 15px;
      border-left: 5px solid #ffd700;
    }

    .main strong em {
      color: #ffd700;
      font-style: normal;
    }

    .main ol {
      padding-left: 25px;
      margin-bottom: 20px;
    }

    .main ol li {
      margin-bottom: 10px;
    }

    /* ---------- POPUP (снизу по центру, появление через 3 сек) ---------- */
    .popup {
      position: fixed;
      bottom: 25px;
      left: 50%;
      transform: translateX(-50%) translateY(30px);
      z-index: 200;
      max-width: 420px;
      width: calc(100% - 40px);
      opacity: 0;
      visibility: hidden;
      transition: opacity 0.5s ease, transform 0.5s ease, visibility 0.5s;
    }

    .popup.show {
      opacity: 1;
      visibility: visible;
      transform: translateX(-50%) translateY(0);
    }

    .popup_block {
      display: flex;
      align-items: center;
      gap: 15px;
      background: linear-gradient(135deg, #033305, #044706);
      border: 2px solid #ffd700;
      border-radius: 18px;
      padding: 18px 20px;
      box-shadow: 0 15px 40px rgba(0, 0, 0, 0.8);
    }

    .block_img img {
      width: 50px;
      height: 50px;
    }

    .block_txt {
      flex: 1;
    }

    .block_txt span {
      display: block;
      font-size: 1.5rem;
      font-weight: 800;
      color: #ffd700;
      line-height: 1.1;
    }

    .block_txt p {
      font-size: 0.85rem;
      color: #bfdcbf;
    }

    .button_3 {
      background: linear-gradient(135deg, #ffd700, #ff8c00);
      color: #011a02;
      padding: 10px 18px;
      font-size: 0.9rem;
    }

    .button_3:hover {
      transform: scale(1.05);
    }

    .popup-close {
      position: absolute;
      top: -10px;
      right: -10px;
      width: 30px;
      height: 30px;
      border-radius: 50%;
      border: 2px solid #ffd700;
      background: #011a02;
      color: #ffd700;
      font-size: 1.2rem;
      line-height: 1;
      cursor: pointer;
      transition: all 0.2s ease;
    }

    .popup-close:hover {
      background: #ffd700;
      color: #011a02;
    }

    /* ---------- FOOTER ---------- */
    footer {
      background: rgba(0, 0, 0, 0.65);
      padding: 30px 0;
      border-top: 1px solid rgba(255, 215, 0, 0.2);
      text-align: center;
      color: #a9d0a9;
      font-size: 0.9rem;
    }

    @media (max-width: 600px) {
      .main h1 { font-size: 1.9rem; }
      .main h2 { font-size: 1.35rem; }
      .header_conteiner { justify-content: center; }
      .popup { bottom: 15px; }
    }