* { box-sizing: border-box; margin: 0; padding: 0; }
    body {
      font-family: 'Quicksand', sans-serif;
      background: linear-gradient(135deg, #e0f7fa, #b2ebf2);
      color: #333;
      padding: 0;
      overflow-x: hidden;
    }

    .top-banner {
      background: linear-gradient(to right, #00acc1, #00bcd4);
      color: white;
      text-align: center;
      padding: 10px 0;
      font-size: 15px;
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 10px;
      box-shadow: 0 2px 8px rgba(0,0,0,0.2);
      position: sticky;
      top: 0;
      z-index: 1001;
    }
    .top-banner img {
      height: 28px;
      vertical-align: middle;
    }
    .top-banner span {
      font-weight: 700;
    }

    .navbar {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 12px 20px;
      background-color: #ffffff;
      box-shadow: 0 1px 6px rgba(0,0,0,0.1);
      position: sticky;
      top: 50px;
      z-index: 1000;
    }
    .navbar .menu-icon-single-bar {
      width: 28px;
      height: 4px;
      background-color: #555;
      position: relative;
      cursor: pointer;
      border-radius: 2px;
      transition: background-color 0.3s ease;
    }
    .navbar .menu-icon-single-bar:hover {
      background-color: #00bcd4;
    }
    .navbar .search-icon {
      display: none;
    }
    .navbar .logo-container {
      display: flex;
      align-items: center;
      gap: 10px;
    }
    .navbar .logo-container img {
      height: 35px;
    }
    .navbar .logo-container span {
      font-size: 22px;
      font-weight: 700;
      color: #00acc1;
    }

    .sidebar-overlay {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background-color: rgba(0, 0, 0, 0.6);
      z-index: 1002;
      display: none;
    }
    .sidebar {
      position: fixed;
      top: 0;
      left: -280px;
      width: 280px;
      height: 100%;
      background-color: #0097a7;
      color: white;
      transition: left 0.3s ease-in-out;
      z-index: 1003;
      box-shadow: 2px 0 15px rgba(0,0,0,0.4);
      padding-top: 20px;
    }
    .sidebar.active {
      left: 0;
    }
    .sidebar-header {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 15px 20px;
      border-bottom: 1px solid rgba(255,255,255,0.3);
      margin-bottom: 20px;
    }
    .sidebar-header .close-btn {
      font-size: 30px;
      cursor: pointer;
    }
    .sidebar-header .sidebar-logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 24px;
      font-weight: 700;
    }
    .sidebar-header .sidebar-logo img {
      height: 45px;
    }
    .sidebar ul {
      list-style: none;
      padding: 0;
    }
    .sidebar ul li {
      padding: 15px 20px;
      font-size: 18px;
      display: flex;
      align-items: center;
      gap: 15px;
      cursor: pointer;
      transition: background-color 0.2s ease, transform 0.2s ease;
    }
    .sidebar ul li:hover {
      background-color: rgba(255,255,255,0.15);
      transform: translateX(5px);
    }
    .sidebar ul li i {
      font-size: 22px;
    }
    .sidebar ul li a {
      color: inherit;
      text-decoration: none;
      display: flex;
      align-items: center;
      gap: 15px;
      width: 100%;
    }


    .section-title {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 20px;
      font-weight: 700;
      color: #555;
      margin-bottom: 15px;
    }
    .section-title .number-circle {
      background-color: #00bcd4;
      color: white;
      border-radius: 50%;
      width: 32px;
      height: 32px;
      display: flex;
      justify-content: center;
      align-items: center;
      font-size: 18px;
      box-shadow: 0 2px 5px rgba(0,0,0,0.2);
    }

    .app-info-header { /* Phần mới chứa ảnh, tên app, thời gian giao dịch */
      display: flex;
      align-items: flex-start;
      gap: 20px;
      margin-bottom: 15px; /* Giảm khoảng cách với phần mô tả */
      padding-bottom: 15px; /* Thêm padding dưới */
      border-bottom: 1px solid #eee; /* Đường kẻ phân cách */
    }
    .app-info-header img {
      width: 80px;
      height: 80px;
      border-radius: 15px;
      object-fit: cover;
      flex-shrink: 0;
      box-shadow: 0 4px 10px rgba(0,0,0,0.1);
    }
    .app-details-header { /* Chi tiết trong phần header */
      flex-grow: 1;
    }
    .app-details-header h2 {
      font-size: 24px;
      color: #333;
      margin-bottom: 8px;
    }
    .app-details-header p {
      font-size: 15px;
      color: #777;
      display: flex;
      align-items: center;
      gap: 10px;
      margin-bottom: 0; /* Bỏ margin-bottom nếu không cần */
    }
    .app-details-header .time-icon {
      color: #ffc107;
    }
    .app-details-header .delivery-icon {
      color: #28a745;
    }

    .app-description-container { /* Thêm container cho phần mô tả */
      font-size: 16px;
      line-height: 1.6;
      color: #555;
      margin-top: 20px; /* Khoảng cách từ đường kẻ trên */
      padding-bottom: 20px; /* Thêm padding dưới để tạo khoảng trống */
      border-bottom: 1px solid #eee; /* Đường kẻ dưới phần mô tả */
      margin-bottom: 25px; /* Khoảng cách đến phần "Nhập tài khoản" */
    }
    .app-description-container a {
      color: #007bff;
      text-decoration: none;
      font-weight: bold;
      cursor: pointer;
    }
    .app-description-container .full-description {
      display: none;
    }

    .input-group {
      margin-bottom: 25px;
    }
    .input-group label {
      font-weight: 700;
      margin-bottom: 8px;
      color: #555;
      font-size: 16px;
    }
    .input-group label a {
      color: #007bff;
      font-size: 14px;
    }
    .input-group input {
      width: 100%;
      padding: 14px 18px;
      border: 1px solid #ddd;
      border-radius: 10px;
      font-size: 17px;
      box-shadow: inset 0 1px 4px rgba(0,0,0,0.08);
    }
    .input-group input::placeholder {
      color: #bbb;
    }

    .total-price {
      display: flex;
      justify-content: space-between;
      align-items: center;
      background: #f8f8f8;
      padding: 18px 25px;
      border-top: 1px solid #eee;
      position: fixed;
      bottom: 0;
      left: 0;
      width: 100%;
      box-shadow: 0 -4px 15px rgba(0,0,0,0.15);
      z-index: 100;
    }
    .total-price p {
      font-size: 20px;
      font-weight: 700;
      color: #333;
    }
    .total-price button {
      padding: 14px 30px;
      border-radius: 12px;
      font-size: 18px;
      cursor: pointer;
      border: none;
      background: linear-gradient(to right, #ff9800, #ff5722);
      color: white;
      font-weight: bold;
      box-shadow: 0 6px 15px rgba(255, 128, 0, 0.4);
      transition: all 0.2s ease;
    }
    .total-price button:hover {
      opacity: 0.95;
      box-shadow: 0 8px 20px rgba(255, 128, 0, 0.5);
      transform: translateY(-2px);
    }

    .card {
      background: #ffffff;
      border-radius: 22px;
      padding: 30px;
      max-width: 650px;
      margin: 25px auto;
      box-shadow: 0 12px 30px rgba(0, 123, 255, 0.18);
    }
    .select-container {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 18px;
      margin-top: 20px;
      margin-bottom: 25px;
    }
    .select-box {
      border: 2px solid #e0e0e0;
      padding: 20px 15px;
      text-align: center;
      border-radius: 15px;
      cursor: pointer;
      background: linear-gradient(145deg, #ffffff, #e1f5fe);
      transition: all 0.3s ease;
      font-weight: 600;
      font-size: 17px;
      box-shadow: 0 5px 12px rgba(0,0,0,0.08);
      position: relative;
    }
    .select-box:hover {
      background: #c5eff7;
    }
    .select-box.selected {
      border-color: #00bcd4;
      background: #b2ebf2;
      box-shadow: 0 6px 15px rgba(0, 188, 212, 0.3);
    }
    .select-box .bonus-badge {
      position: absolute;
      top: -8px;
      right: -8px;
      background-color: #ffc107;
      color: white;
      font-size: 12px;
      padding: 4px 8px;
      border-radius: 6px;
      font-weight: bold;
      box-shadow: 0 3px 8px rgba(0,0,0,0.25);
    }
    .select-box .bonus-badge.first-time-bonus {
        background-color: #00bcd4;
    }

    .promo-section {
      max-width: 650px;
      margin: 30px auto 100px auto;
      background-color: #ffffff;
      border-radius: 22px;
      box-shadow: 0 12px 30px rgba(0, 123, 255, 0.18);
      overflow: hidden;
    }
    .promo-header {
      background: linear-gradient(to right, #00acc1, #00bcd4);
      color: white;
      padding: 25px;
      text-align: center;
    }
    .promo-header h2 {
      font-size: 26px;
      margin-bottom: 8px;
    }
    .promo-header p {
      font-size: 17px;
    }
    .promo-content {
      padding: 25px;
    }
    .promo-item {
      display: flex;
      align-items: flex-start;
      margin-bottom: 25px;
      gap: 20px;
    }
    .promo-item:last-child {
      margin-bottom: 0;
    }
    .promo-item .icon-circle {
      background-color: #e0f2f7;
      border-radius: 50%;
      width: 55px;
      height: 55px;
      display: flex;
      justify-content: center;
      align-items: center;
      font-size: 28px;
      color: #00bcd4;
      flex-shrink: 0;
      box-shadow: 0 3px 8px rgba(0,0,0,0.1);
    }
    .promo-item .text-content h3 {
      font-size: 20px;
      color: #333;
      margin-bottom: 8px;
    }
    .promo-item .text-content p {
      font-size: 15px;
      color: #666;
      line-height: 1.6;
    }

    body::after {
      content: '';
      display: block;
      height: 100px;
    }