/* Reset & Base */
    * { box-sizing: border-box; margin: 0; padding: 0; }
    body {
      font-family: 'Poppins', sans-serif;
      background: linear-gradient(135deg, #6c5ce7, #00b894);
      color: #fff;
      min-height: 100vh;
      padding: 20px;
      overflow-x: hidden;
      position: relative;
    }

    .container {
      max-width: 900px;
      margin: auto;
      background: rgba(255, 255, 255, 0.1);
      border-radius: 20px;
      padding: 30px 20px;
      backdrop-filter: blur(14px);
      box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
    }

    h2 {
      text-align: center;
      font-size: 28px;
      margin-bottom: 20px;
    }

    .referral-box {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
      margin-bottom: 20px;
    }

    .referral-box input,
    .referral-box button {
      font-size: 16px;
      padding: 12px;
      border-radius: 12px;
    }

    .referral-box input {
      flex: 1;
      min-width: 240px;
      border: none;
      background: rgba(255,255,255,0.2);
      color: #fff;
      outline: none;
    }

    .referral-box button {
      background: #00cec9;
      border: none;
      color: white;
      font-weight: bold;
      cursor: pointer;
      transition: all 0.3s ease;
    }

    .referral-box button:hover {
      background: #00b894;
      transform: scale(1.05);
    }

    .cta {
      display: block;
      width: 100%;
      padding: 14px;
      background: linear-gradient(90deg, #fd79a8, #a29bfe);
      color: white;
      text-align: center;
      border-radius: 16px;
      font-weight: 600;
      font-size: 18px;
      text-decoration: none;
      margin: 20px 0;
      transition: transform 0.2s ease;
    }

    .cta:hover {
      transform: scale(1.03);
      box-shadow: 0 0 20px #a29bfe;
    }

    .social-icons {
      display: flex;
      justify-content: center;
      flex-wrap: wrap;
      gap: 16px;
      margin: 20px 0;
    }

    .social-icons img {
      width: 40px;
      cursor: pointer;
      transition: transform 0.3s ease;
    }

    .social-icons img:hover {
      transform: scale(1.2);
    }

    .stats {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
      gap: 16px;
      margin-top: 30px;
    }

    .stat-box {
      background: rgba(255,255,255,0.15);
      border-radius: 14px;
      padding: 16px;
      text-align: center;
      backdrop-filter: blur(8px);
    }

    .stat-box h4 {
      font-size: 14px;
      color: #dfe6e9;
    }

    .stat-box span {
      font-size: 24px;
      font-weight: bold;
      margin-top: 8px;
      display: block;
    }

    .tips-modern {
      padding: 40px 20px;
      background: linear-gradient(145deg, #0f2027, #203a43, #2c5364);
      border-radius: 20px;
      margin-top: 40px;
      box-shadow: 0 0 20px rgba(0,0,0,0.5);
    }

    .tips-modern h2 {
      font-size: 28px;
      margin-bottom: 30px;
      font-weight: 700;
      color: #00cec9;
      text-align: center;
    }

    .tips-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
      gap: 25px;
    }

    .tip-card {
      background: rgba(255, 255, 255, 0.07);
      padding: 25px 20px;
      border-radius: 18px;
      transition: transform 0.3s ease, box-shadow 0.3s ease;
    }

    .tip-card:hover {
      transform: translateY(-6px);
      box-shadow: 0 8px 24px rgba(0,0,0,0.4);
      background: rgba(255, 255, 255, 0.1);
    }

    .tip-card i {
      font-size: 32px;
      margin-bottom: 15px;
      background: linear-gradient(45deg, #00cec9, #6c5ce7);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .tip-card h3 {
      font-size: 20px;
      margin-bottom: 10px;
    }

    .tip-card p {
      font-size: 14px;
      color: #dfe6e9;
    }

    /* Toast Notification */
    #toast {
      position: fixed;
      bottom: 250px;
      left: 50%;
      transform: translateX(-50%);
      background: #00cec9;
      color: #fff;
      padding: 12px 24px;
      border-radius: 30px;
      font-weight: 600;
      font-size: 16px;
      box-shadow: 0 8px 16px rgba(0,0,0,0.2);
      opacity: 0;
      transition: opacity 0.4s ease;
      z-index: 9999;
    }

    /* Footer */
    footer {
      margin-top: 50px;
      text-align: center;
      padding: 20px;
      background: rgba(0,0,0,0.2);
      border-radius: 14px;
      font-size: 14px;
    }

    footer a {
      color: #00cec9;
      margin: 0 10px;
      text-decoration: none;
    }

    footer i {
      margin-right: 6px;
    }

    /* Responsive */
    @media screen and (max-width: 600px) {
      .referral-box { flex-direction: column; align-items: stretch; }
      .referral-box input, .referral-box button { width: 100%; font-size: 16px; }
      .cta { font-size: 16px; padding: 12px; }
      .tip-card h3 { font-size: 18px; }
      .tip-card p { font-size: 13px; }
    }