* {
        margin: 0;
        padding: 0;
        box-sizing: border-box;
        font-family: "Poppins", sans-serif;
      }

      :root {
        --primary-color: #2041ff;
        --secondary-color: #6ea3ff;
        --accent-color: #ffffff;
        --light-color: #aff3ff;
        --text-color: #000000;
        --white: #ffffff;
        --error-color: #fe615c;
        --success-color: #66cc99;
        --card-bg: rgba(255, 255, 255, 0.9);
        --shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
      }

      /* Header styles */
      .header-menu {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        background: linear-gradient(
          135deg,
          var(--primary-color),
          var(--secondary-color)
        );
        padding: 0 10%;
        display: flex;
        align-items: center;
        justify-content: space-between;
        z-index: 1000;
        box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
        border-bottom: 2px solid #fff;
        transition: all 0.3s ease;
      }

      .header-menu:hover {
        box-shadow: 0 6px 16px rgba(0, 0, 0, 0.15);
      }

      .logo {
        font-size: 28px;
        font-weight: 700;
        color: var(--white);
        text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.2);
        letter-spacing: 1px;
      }

      .navigation ul {
        list-style: none;
        margin: 0;
        padding: 0;
        display: flex;
      }

      .header-menu .navigation ul li {
        position: relative;
      }

      .header-menu .navigation ul li a {
        font-size: 16px;
        font-weight: 500;
        color: var(--white);
        text-decoration: none;
        padding: 22px 20px;
        display: block;
        transition: all 0.3s ease;
      }

      .header-menu .navigation ul li a:hover {
        background-color: rgba(255, 255, 255, 0.733);
        transform: translateY(-2px);
        color: var(--primary-color);
      }

      #toggle,
      .header-menu label {
        display: none;
        cursor: pointer;
      }

      .menu {
        width: 28px;
        height: 28px;
        filter: brightness(0) invert(1);
      }

      @media (max-width: 950px) {
        .header-menu label {
          display: initial;
        }

        .header-menu {
          padding: 15px 10%;
        }

        .header-menu .navigation {
          position: absolute;
          top: 100%;
          left: 0;
          right: 0;
          background: var(--primary-color);
          display: none;
          border-radius: 0 0 12px 12px;
        }

        .header-menu .navigation ul {
          flex-direction: column;
        }

        .header-menu .navigation ul li {
          width: 100%;
        }

        .header-menu .navigation ul li a {
          padding: 12px 20px;
        }

        #toggle:checked ~ .navigation {
          display: block;
          animation: slideDown 0.4s ease-out;
        }
      }

      /* Body styles */
      body {
        background: linear-gradient(
          135deg,
          hsl(215, 100%, 86%),
          #3b97ff,
          #5c9bee
        );
        margin: 0;
        padding: 0;
        padding-top: 80px;
        min-height: 100vh;
        color: var(--text-color);
        background-size: 400% 400%;
        animation: gradientBG 15s ease infinite;
      }

      @keyframes gradientBG {
        0% {
          background-position: 0% 50%;
        }
        50% {
          background-position: 100% 50%;
        }
        100% {
          background-position: 0% 50%;
        }
      }

      @keyframes slideDown {
        from {
          opacity: 0;
          transform: translateY(-20px);
        }
        to {
          opacity: 1;
          transform: translateY(0);
        }
      }

      /* Main content styles */
      .main-container {
        max-width: 800px;
        margin: 0 auto;
        padding: 30px;
      }

      h1 {
        color: var(--white);
        text-align: center;
        margin-bottom: 30px;
        font-size: 2.2rem;
        text-shadow: 1px 1px 3px rgba(0, 0, 0, 0.2);
      }

      .reading-box {
        background-color: var(--card-bg);
        padding: 25px;
        border-radius: 15px;
        box-shadow: var(--shadow);
        margin-bottom: 30px;
        border-left: 5px solid var(--primary-color);
        transition: all 0.3s ease;
      }

      .reading-box:hover {
        transform: translateY(-5px);
        box-shadow: 0 15px 30px rgba(0, 0, 0, 0.15);
      }

      .question {
        background-color: var(--card-bg);
        padding: 20px;
        margin-bottom: 20px;
        border-radius: 15px;
        box-shadow: var(--shadow);
        transition: all 0.3s ease;
      }

      .question:hover {
        transform: translateY(-3px);
        box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
      }

      .options {
        display: flex;
        gap: 20px;
        margin-top: 15px;
      }

      .option {
        display: flex;
        align-items: center;
        gap: 10px;
        cursor: pointer;
        padding: 8px 15px;
        border-radius: 30px;
        background-color: #e6f7ff;
        transition: all 0.3s;
      }

      .option:hover {
        background-color: #cceeff;
      }

      .option input {
        transform: scale(1.5);
        cursor: pointer;
      }

      .buttons-container {
        display: flex;
        justify-content: center;
        gap: 20px;
        margin: 30px auto;
      }

      .check-btn,
      .reset-btn {
        padding: 15px 30px;
        color: white;
        border: none;
        border-radius: 30px;
        font-size: 1.1rem;
        font-weight: 600;
        cursor: pointer;
        box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
        transition: all 0.3s;
        display: flex;
        align-items: center;
        gap: 10px;
      }

      .check-btn {
        background: linear-gradient(
          135deg,
          var(--primary-color),
          var(--secondary-color)
        );
      }

      .reset-btn {
        background: linear-gradient(135deg, var(--error-color), #e53935);
      }

      .check-btn:hover {
        transform: translateY(-3px);
        box-shadow: 0 6px 12px rgba(32, 65, 255, 0.3);
      }

      .reset-btn:hover {
        transform: translateY(-3px);
        box-shadow: 0 6px 12px rgba(229, 57, 53, 0.3);
      }

      .result {
        text-align: center;
        font-size: 1.2rem;
        font-weight: 500;
        margin-top: 30px;
        padding: 20px;
        border-radius: 10px;
        background-color: rgba(255, 255, 255, 0.8);
        box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
      }

      .correct {
        color: var(--success-color);
        background-color: rgba(76, 175, 80, 0.1);
        border-left: 4px solid var(--success-color);
      }

      .incorrect {
        color: var(--error-color);
        background-color: rgba(254, 97, 92, 0.1);
        border-left: 4px solid var(--error-color);
      }

      .highlight {
        background-color: #ffeb99;
        padding: 2px 5px;
        border-radius: 3px;
      }

      /* Celebration modal */
      .celebration {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background: rgba(0, 0, 0, 0.7);
        display: flex;
        justify-content: center;
        align-items: center;
        z-index: 2000;
        animation: fadeIn 0.5s;
      }

      .celebration-content {
        background: white;
        padding: 40px;
        border-radius: 20px;
        text-align: center;
        max-width: 500px;
        animation: zoomIn 0.5s;
        box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
        position: relative;
        overflow: hidden;
      }

      .celebration-content::before {
        content: "";
        position: absolute;
        top: -10px;
        left: -10px;
        right: -10px;
        bottom: -10px;
        background: linear-gradient(
          45deg,
          var(--primary-color),
          var(--secondary-color),
          var(--success-color)
        );
        z-index: -1;
        filter: blur(20px);
        opacity: 0.3;
      }

      .celebration-content h2 {
        color: var(--primary-color);
        font-size: 2rem;
        margin-bottom: 20px;
      }

      .celebration-content p {
        font-size: 1.2rem;
        margin-bottom: 25px;
        line-height: 1.6;
      }

      .celebration-content button {
        background: var(--primary-color);
        color: white;
        border: none;
        padding: 12px 25px;
        border-radius: 30px;
        cursor: pointer;
        font-size: 1rem;
        font-weight: 600;
        transition: all 0.3s;
      }

      .celebration-content button:hover {
        transform: scale(1.05);
        box-shadow: 0 5px 15px rgba(32, 65, 255, 0.3);
      }

      .confetti {
        position: absolute;
        width: 10px;
        height: 10px;
        background-color: #f00;
        border-radius: 50%;
        animation: confettiFall 5s linear forwards;
      }

      @keyframes fadeIn {
        from {
          opacity: 0;
        }
        to {
          opacity: 1;
        }
      }

      @keyframes zoomIn {
        from {
          transform: scale(0.8);
          opacity: 0;
        }
        to {
          transform: scale(1);
          opacity: 1;
        }
      }

      @keyframes confettiFall {
        0% {
          transform: translateY(-100vh) rotate(0deg);
          opacity: 1;
        }
        100% {
          transform: translateY(100vh) rotate(360deg);
          opacity: 0;
        }
      }

      /* Responsive adjustments */
      @media (max-width: 768px) {
        .main-container {
          padding: 20px;
        }

        h1 {
          font-size: 1.8rem;
        }

        .question {
          padding: 15px;
        }

        .options {
          flex-direction: column;
          gap: 10px;
        }

        .buttons-container {
          flex-direction: column;
          gap: 15px;
        }

        .check-btn,
        .reset-btn {
          width: 100%;
          padding: 12px;
          font-size: 1rem;
          justify-content: center;
        }
      }