:root {
    --color-primary: #FF6B35;
    /* naranja vibrante */
    --color-secondary: #4ECDC4;
    /* turquesa */
    --color-math: #FFD93D;
    /* amarillo — Matemáticas */
    --color-english: #6C63FF;
    /* morado — Inglés */
    --color-academy: #FF6B9D;
    /* rosa — Academia */
    --color-other: #B0BEC5;
    /* gris — Próximamente */
    --color-lengua: #43A047;
    /* verde — Lengua */
    --color-correct: #2ECC71;
    /* verde éxito */
    --color-wrong: #E74C3C;
    /* rojo error */
    --color-bg: #FFF9F0;
    /* fondo crema cálido */
    --shadow-card: 0 8px 25px rgba(0, 0, 0, 0.12);
    --radius-card: 20px;
    --radius-btn: 50px;
    --radius-input: 15px;
}

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

body {
    font-family: 'Nunito', sans-serif;
    font-size: 18px;
    background: var(--color-bg);
    background-image: radial-gradient(circle at 20% 20%, rgba(255, 107, 53, 0.08) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(78, 205, 196, 0.08) 0%, transparent 50%);
    min-height: 100vh;
    color: #333;
}

.contenedor {
    max-width: 1200px;
    margin: 0 auto;
    padding: 80px 20px 20px;
    /* Espacio para el contador fijo */
    animation: fadeIn 0.3s ease;
}

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

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Barra de contador (fija arriba) */
.contador-barra {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(8px);
    padding: 8px 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    font-size: 16px;
    font-weight: 700;
    flex-wrap: wrap;
}

.contador-izq { display: flex; align-items: center; gap: 4px; }
.contador-der { display: flex; align-items: center; gap: .5rem; flex-wrap: wrap; }

.contador-correctas { color: var(--color-correct); }
.contador-falladas  { color: var(--color-wrong); }

/* Info de usuario en la barra */
.user-info {
    display: inline-flex; align-items: center; gap: .4rem;
    font-size: .85rem; color: #555;
}

/* Badges de licencia */
.badge-lic {
    display: inline-block; border-radius: 8px;
    padding: .1rem .5rem; font-size: .72rem; font-weight: 800;
}
.badge-total      { background: #e0d4ff; color: #4a1fa0; }
.badge-anual      { background: #d4e8ff; color: #1a4fa0; }
.badge-trimestral { background: #d4f5e2; color: #1a7a45; }

/* Botones de la barra superior */
.btn-header {
    display: inline-block; padding: .3rem .8rem;
    border-radius: 20px; font-size: .78rem; font-weight: 700;
    background: #f0ecff; color: #7c5ef0;
    text-decoration: none; transition: .2s;
}
.btn-header:hover { background: #7c5ef0; color: #fff; }
.btn-logout { background: #fde8e8; color: #b00; }
.btn-logout:hover { background: #b00; color: #fff; }

/* Botón "Entrar" del login */
.btn-login {
    display: block; width: 100%; padding: .85rem;
    background: linear-gradient(135deg,#7c5ef0,#5eaef0);
    color:#fff; border:none; border-radius:12px;
    font-family:'Nunito',sans-serif; font-size:1.05rem; font-weight:800;
    cursor:pointer; transition:opacity .2s, transform .1s;
}

/* Cabecera de navegación */
.cabecera-pagina {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 30px;
    padding: 0 10px;
}

.titulo-pagina {
    font-size: 32px;
    font-weight: 900;
    color: var(--color-primary);
    text-align: center;
    flex-grow: 1;
}

/* Botón Atrás */
.btn-atras {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: white;
    border: 2px solid #ddd;
    border-radius: 50px;
    padding: 8px 18px;
    font-size: 18px;
    font-weight: 700;
    color: #555;
    text-decoration: none;
    min-width: 48px;
    min-height: 48px;
    transition: all 0.2s;
}

.btn-atras:hover {
    background: #f5f5f5;
    border-color: var(--color-primary);
    color: var(--color-primary);
}

/* Tarjetas del menú */
.grid-menu {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    margin-top: 20px;
}

.menu-card {
    width: 100%;
    min-height: 220px;
    border-radius: var(--radius-card);
    box-shadow: var(--shadow-card);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    text-decoration: none;
    padding: 30px 20px;
    border: none;
}

.menu-card:hover {
    transform: scale(1.05);
    box-shadow: 0 14px 35px rgba(0, 0, 0, 0.18);
}

.menu-card .icon {
    font-size: 64px;
    margin-bottom: 15px;
}

.menu-card .label {
    font-size: 22px;
    font-weight: 800;
    color: white;
    text-align: center;
}

.menu-card.math {
    background: linear-gradient(135deg, #FFD93D, #FF6B35);
}

.menu-card.english {
    background: linear-gradient(135deg, #6C63FF, #4ECDC4);
}

.menu-card.academy {
    background: linear-gradient(135deg, #FF6B9D, #FF6B35);
}

.menu-card.other {
    background: linear-gradient(135deg, #B0BEC5, #90A4AE);
}

.menu-card.lengua {
    background: linear-gradient(135deg, #43A047, #66BB6A);
}

.menu-card.lengua-lectura {
    background: linear-gradient(135deg, #1565C0, #42A5F5);
}

/* Botones */
.btn {
    border: none;
    border-radius: var(--radius-btn);
    padding: 15px 35px;
    font-size: 20px;
    font-weight: 700;
    font-family: 'Nunito', sans-serif;
    cursor: pointer;
    min-height: 54px;
    transition: transform 0.15s, box-shadow 0.15s;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    text-decoration: none;
    justify-content: center;
}

.btn:active {
    transform: scale(0.96);
}

.btn-primary {
    background: var(--color-primary);
    color: white;
    box-shadow: 0 4px 15px rgba(255, 107, 53, 0.4);
}

.btn-secondary {
    background: var(--color-secondary);
    color: white;
    box-shadow: 0 4px 15px rgba(78, 205, 196, 0.4);
}

.btn-success {
    background: var(--color-correct);
    color: white;
    box-shadow: 0 4px 15px rgba(46, 204, 113, 0.4);
}

/* Inputs */
.input-respuesta {
    border: 3px solid #ddd;
    border-radius: var(--radius-input);
    padding: 12px 18px;
    font-size: 22px;
    font-weight: 700;
    font-family: 'Nunito', sans-serif;
    text-align: center;
    width: 100%;
    max-width: 300px;
    transition: border-color 0.2s;
    outline: none;
}

.input-respuesta:focus {
    border-color: var(--color-primary);
}

.input-respuesta.ok {
    border-color: var(--color-correct);
    background: #f0fff4;
}

.input-respuesta.error {
    border-color: var(--color-wrong);
    background: #fff5f5;
}

/* Contenedores de Ejercicios */
.ejercicio-card {
    background: white;
    border-radius: var(--radius-card);
    padding: 40px;
    box-shadow: var(--shadow-card);
    text-align: center;
    max-width: 700px;
    margin: 0 auto;
}

.pregunta-texto {
    font-size: 32px;
    font-weight: 800;
    margin-bottom: 25px;
}

/* Feedback Overlay */
.feedback-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.75);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    animation: fadeInOverlay 0.3s ease;
}

@keyframes fadeInOverlay {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

.feedback-card {
    background: white;
    border-radius: 24px;
    padding: 30px 40px;
    text-align: center;
    max-width: 380px;
    width: 90%;
}

.feedback-gif {
    width: 220px;
    height: 220px;
    object-fit: cover;
    border-radius: 16px;
}

.feedback-texto {
    font-size: 26px;
    font-weight: 800;
    margin-top: 16px;
}

.feedback-overlay.correcto .feedback-card {
    border: 5px solid var(--color-correct);
}

.feedback-overlay.incorrecto .feedback-card {
    border: 5px solid var(--color-wrong);
}

.feedback-overlay.fade-out {
    animation: fadeOut 0.4s ease forwards;
}

@keyframes fadeOut {
    from {
        opacity: 1;
    }

    to {
        opacity: 0;
    }
}

/* ABN Styles */
.abn-container {
    max-width: 700px;
    margin: 0 auto;
    text-align: center;
}

.abn-enunciado {
    font-size: 36px;
    font-weight: 900;
    margin-bottom: 20px;
    background: linear-gradient(135deg, var(--color-math), var(--color-primary));
    color: white;
    border-radius: 16px;
    padding: 16px 30px;
    display: inline-flex;
    align-items: center;
    gap: 12px;
    box-shadow: var(--shadow-card);
}

.abn-tabla {
    width: 100%;
    border-collapse: separate;
    border-spacing: 8px;
    margin: 0 auto 24px;
}

.abn-tabla th {
    background: var(--color-primary);
    color: white;
    padding: 12px;
    border-radius: 10px;
    font-size: 16px;
}

.abn-tabla td {
    background: white;
    border-radius: 12px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    padding: 8px;
}

.abn-input {
    width: 100%;
    max-width: 140px;
    padding: 10px;
    font-size: 22px;
    font-weight: 800;
    font-family: 'Nunito', sans-serif;
    border: 3px solid #e0e0e0;
    border-radius: 10px;
    text-align: center;
    background: #fafafa;
    transition: all 0.2s;
    outline: none;
}

.abn-input:focus {
    border-color: var(--color-primary);
    background: #fff;
}

.abn-input.ok {
    border-color: var(--color-correct);
    background: #f0fff4;
}

.abn-input.error {
    border-color: var(--color-wrong);
    background: #fff5f5;
}

.celda-resultado {
    position: relative;
}

.input-resultado-final {
    border: 4px solid #FFD93D !important;
    background: #fffde7 !important;
    font-size: 26px !important;
}

.input-resultado-final.ok {
    border-color: var(--color-correct) !important;
    background: #f0fff4 !important;
    box-shadow: 0 0 0 4px rgba(46, 204, 113, 0.3) !important;
}

.nivel-selector {
    margin-bottom: 30px;
}

.nivel-botones {
    display: flex;
    gap: 15px;
    justify-content: center;
    margin-top: 10px;
}

.btn-nivel {
    background: white;
    border: 2px solid #ddd;
    font-size: 14px;
    padding: 10px 15px;
    text-align: center;
    color: #666;
}

.btn-nivel.activo {
    border-color: var(--color-primary);
    background: var(--color-primary);
    color: white;
}

.btn-nivel small {
    display: block;
    font-size: 11px;
    opacity: 0.8;
}

/* Responsive */
@media (max-width: 1024px) {
    .grid-menu {
        grid-template-columns: repeat(2, 1fr);
    }

    .titulo-pagina {
        font-size: 26px;
    }
}

@media (max-width: 600px) {
    .grid-menu {
        grid-template-columns: 1fr;
    }

    .btn {
        width: 100%;
        justify-content: center;
    }

    .input-respuesta {
        max-width: 100%;
    }

    .cabecera-pagina {
        flex-direction: column;
        gap: 15px;
    }

    .titulo-pagina {
        order: -1;
    }

    .abn-tabla th {
        font-size: 12px;
        padding: 8px;
    }

    .abn-input {
        font-size: 18px;
        padding: 8px;
    }
}

/* Fracciones visuales */
.fraccion-visual {
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    font-size: 32px;
    font-weight: 800;
    line-height: 1;
    vertical-align: middle;
    margin: 0 8px;
}

.barra-div {
    width: 100%;
    min-width: 40px;
    height: 4px;
    background: #333;
    border-radius: 2px;
    margin: 5px 0;
}