:root {
        --primary-color: #5b6abf;
        --secondary-color: #9c64a6;
        --accent-color: #6a5acd;
        --light-color: #e6e6fa;
        --success-color: #4caf50;
        --error-color: #f44336;
        --text-color: #2c3e50;
        --white: #ffffff;
      }

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

      /* Estilos del Header mejorado */
      .header {
        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);
        transition: all 0.3s ease;
        height: 70px;
      }

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

      .logo {
        font-size: 28px;
        font-family: "Montserrat", sans-serif;
        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 .navigation ul li {
        position: relative;
      }

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

      .header .navigation ul li a:hover {
        background-color: rgba(255, 255, 255, 0.15);
        transform: translateY(-2px);
      }

      .header .navigation ul li ul {
        position: absolute;
        right: 0;
        width: 220px;
        background: rgba(255, 255, 255, 0.95);
        border-radius: 0 0 8px 8px;
        box-shadow: 0 8px 16px rgba(0, 0, 0, 0.1);
        display: none;
        overflow: hidden;
        flex-direction: column;
      }

      .header .navigation ul li ul li a {
        color: var(--text-color);
        padding: 12px 20px;
        font-size: 14px;
      }

      .header .navigation ul li ul li a:hover {
        background-color: var(--light-color);
        color: var(--primary-color);
      }

      .header .navigation ul li:hover > ul {
        display: flex;
        animation: fadeIn 0.3s ease-out;
      }

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

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

      /* Estilos del cuerpo y fondo */
      body {
        font-family: "Poppins", sans-serif;
        background: linear-gradient(135deg, #e0f7fa, #d1c4e9, #b3e5fc);
        margin: 0;
        padding: 0;
        padding-top: 90px;
        min-height: 100vh;
        color: var(--text-color);
        background-size: 400% 400%;
        animation: gradientBG 15s ease infinite;
      }

      /* Contenedor principal */
      .rules-container {
        max-width: 800px;
        width: 90%;
        margin: 20px auto;
        padding: 30px;
        background-color: rgba(255, 255, 255, 0.95);
        border-radius: 12px;
        box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
        transition: transform 0.3s ease, box-shadow 0.3s ease;
      }

      .rules-container:hover {
        transform: translateY(-5px);
        box-shadow: 0 12px 30px rgba(0, 0, 0, 0.2);
      }

      .rules-container h1 {
        text-align: center;
        color: var(--primary-color);
        margin-bottom: 25px;
        font-family: "Montserrat", sans-serif;
        font-size: 2.2rem;
        position: relative;
        padding-bottom: 10px;
      }

      .rules-container h1::after {
        content: "";
        position: absolute;
        bottom: 0;
        left: 50%;
        transform: translateX(-50%);
        width: 80px;
        height: 4px;
        background: linear-gradient(
          to right,
          var(--primary-color),
          var(--secondary-color)
        );
        border-radius: 2px;
      }

      /* Secciones de reglas */
      .rule-section {
        margin-bottom: 30px;
        background-color: rgba(230, 230, 250, 0.3);
        padding: 20px;
        border-radius: 8px;
        border-left: 4px solid var(--secondary-color);
        transition: transform 0.2s ease;
      }

      .rule-section:hover {
        transform: translateX(5px);
        box-shadow: 0 5px 15px rgba(0, 0, 0, 0.08);
      }

      .rule-section h2 {
        color: var(--secondary-color);
        margin-bottom: 15px;
        font-size: 22px;
        font-weight: 600;
      }

      /* Tablas de conjugación */
      .conjugation-table {
        width: 100%;
        border-collapse: collapse;
        margin: 15px 0;
        border-radius: 6px;
        overflow: hidden;
        box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
      }

      .conjugation-table th,
      .conjugation-table td {
        padding: 12px 15px;
        text-align: left;
        border-bottom: 1px solid #ddd;
      }

      .conjugation-table th {
        background-color: var(--light-color);
        color: var(--primary-color);
        font-weight: 600;
      }

      .conjugation-table tr:nth-child(even) {
        background-color: rgba(230, 230, 250, 0.2);
      }

      .conjugation-table tr:hover {
        background-color: rgba(230, 230, 250, 0.5);
      }

      .conjugation-table tr:last-child td {
        border-bottom: none;
      }

      /* Uso del verbo */
      .usage-section {
        background-color: rgba(175, 243, 255, 0.2);
        padding: 20px;
        border-radius: 8px;
        margin: 25px 0;
        box-shadow: 0 3px 10px rgba(0, 0, 0, 0.05);
        border-left: 4px solid var(--accent-color);
      }

      .usage-section h3 {
        color: var(--accent-color);
        margin-bottom: 15px;
        font-size: 20px;
        font-weight: 600;
      }

      .usage-section ul {
        padding-left: 20px;
        list-style-type: circle;
      }

      .usage-section li {
        margin-bottom: 10px;
        line-height: 1.6;
        position: relative;
        padding-left: 5px;
      }

      .usage-section li::marker {
        color: var(--accent-color);
      }

      /* Ejemplos */
      .examples {
        font-style: italic;
        color: #555;
        margin: 15px 0;
        padding: 12px 15px;
        border-left: 3px solid var(--accent-color);
        background-color: rgba(255, 255, 255, 0.5);
        border-radius: 0 6px 6px 0;
      }

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

      @keyframes fadeIn {
        from {
          opacity: 0;
          transform: translateY(-10px);
        }
        to {
          opacity: 1;
          transform: translateY(0);
        }
      }

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

      /* Media Queries para responsividad */
      @media (max-width: 950px) {
        .header {
          padding: 0 5%;
        }

        .header label {
          display: initial;
        }

        .header {
          padding: 15px 5%;
        }

        .logo {
          font-size: 24px;
        }

        .header .navigation {
          position: absolute;
          top: 70px;
          left: 0;
          right: 0;
          background: var(--primary-color);
          display: none;
          border-radius: 0 0 12px 12px;
          box-shadow: 0 6px 12px rgba(0, 0, 0, 0.1);
        }

        .header .navigation ul {
          flex-direction: column;
          width: 100%;
        }

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

        .header .navigation ul li a {
          padding: 12px 20px;
          border-bottom: 1px solid rgba(255, 255, 255, 0.1);
        }

        .header .navigation ul li ul {
          position: relative;
          width: 100%;
          left: 0;
          background: rgba(255, 255, 255, 0.1);
          box-shadow: none;
        }

        .header .navigation ul li ul li a {
          padding-left: 30px;
          color: rgba(255, 255, 255, 0.8);
        }

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

        .rules-container {
          margin-top: 30px;
          padding: 20px;
          width: 95%;
        }

        .rules-container h1 {
          font-size: 1.8rem;
        }
      }

      @media (max-width: 600px) {
        body {
          padding-top: 80px;
        }

        .rules-container {
          padding: 15px;
          margin-top: 20px;
        }

        .rules-container h1 {
          font-size: 1.5rem;
        }

        .rule-section h2 {
          font-size: 18px;
        }

        .rule-section {
          padding: 15px;
        }

        .conjugation-table {
          display: block;
          overflow-x: auto;
          white-space: nowrap;
        }

        .conjugation-table th,
        .conjugation-table td {
          padding: 10px;
        }

        .usage-section h3 {
          font-size: 18px;
        }

        .examples {
          padding: 10px;
        }
      }