:root {
      --titre-top: 40px;
      --titre-left: 50px;
      --soustitre-top: 100px;
      --soustitre-left: 50px;
      --header-height: 160px;
      --bouton-largeur: 135px;

      --color-primary: #2c3e50;
      --color-accent: #d4af37;
      --color-bg: #f4f7f6;
      --color-text: #333;
      --color-white: #ffffff;
    }

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

    body {
      font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
      background-color: var(--color-bg);
      color: var(--color-text);
      line-height: 1.6;
    }

    header {
      height: var(--header-height);
      width: 100%;
      background:
        linear-gradient(rgba(0, 0, 0, 0.4), rgba(0, 0, 0, 0.4)),
        url("/assets/img/khmvoice_img.png");
      background-size: cover;
      background-position: center;
      position: relative;
      color: var(--color-white);
      box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    }

    .titre-libre {
      position: absolute;
      top: var(--titre-top);
      left: var(--titre-left);
      font-size: 2rem;
      text-transform: uppercase;
      letter-spacing: 2px;
      text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5);
    }

    .soustitre-libre {
      position: absolute;
      top: var(--soustitre-top);
      left: var(--soustitre-left);
      background: rgba(255, 255, 255, 0.2);
      padding: 5px 15px;
      border-radius: 4px;
      backdrop-filter: blur(5px);
      border: 1px solid rgba(255, 255, 255, 0.3);
      font-family: "Khmer OS Muol", Khmer, Tahoma, Geneva, Verdana, sans-serif;
    }

    main {
      max-width: 1000px;
      margin: 30px auto;
      padding: 0 20px;
      display: flex;
      gap: 30px;
      align-items: flex-start;
    }

    .video-container {
      flex: 1;
      min-width: 0;
    }

    .video-wrapper {
      position: relative;
      padding-bottom: 56.25%;
      height: 0;
      overflow: hidden;
      border-radius: 8px;
      box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
      background: #000;
    }

    .video-wrapper iframe {
      position: absolute;
      inset: 0;
      width: 100%;
      height: 100%;
      border: none;
    }

    .controls {
      display: flex;
      flex-direction: column;
      gap: 15px;
      align-items: center;
    }

    .btn,
    select.btn {
      width: var(--bouton-largeur);
      min-height: 44px;
      padding: 12px;
      border: none;
      border-radius: 5px;
      background-color: var(--color-primary);
      color: white;
      cursor: pointer;
      transition: all 0.3s ease;
      text-align: center;
      text-decoration: none;
      font-size: 0.9rem;
    }

    .btn:hover,
    .btn:focus-visible {
      background-color: var(--color-accent);
      transform: translateY(-2px);
      outline: none;
    }

    select.btn {
      appearance: none;
      background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='white'%3e%3cpath d='M7 10l5 5 5-5z'/%3e%3c/svg%3e");
      background-repeat: no-repeat;
      background-position: right 10px center;
      background-size: 15px;
      padding-right: 34px;
    }

    footer {
      text-align: center;
      padding: 20px;
      margin-top: 40px;
      border-top: 1px solid #ddd;
      font-size: 0.9rem;
      color: #777;
    }

    @media (max-width: 768px) {
      :root {
        --titre-left: 20px;
        --soustitre-left: 20px;
      }

      .titre-libre {
        font-size: 1.55rem;
      }

      .soustitre-libre {
        right: 20px;
        font-size: 0.9rem;
      }

      main {
        flex-direction: column;
      }

      .controls {
        width: 100%;
        flex-direction: row;
        justify-content: center;
        flex-wrap: wrap;
      }

      .btn,
      select.btn {
        flex: 1 1 135px;
        max-width: 190px;
      }
    }