/* Variables de color estilo pastel/arcoíris */
:root {
    --color-bg: #FDFBF7;
    --color-text-dark: #4A4A4A;
    --color-text-light: #6C6C6C;
    --pastel-red: #FFB3BA;
    --pastel-orange: #FFDFBA;
    --pastel-yellow: #FFFFBA;
    --pastel-green: #BAFFC9;
    --pastel-blue: #BAE1FF;
}

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

body {
    background-color: var(--color-bg);
    color: var(--color-text-dark);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    position: relative;
    overflow-x: hidden;
    /* Suaviza el scroll y la interacción táctil */
    -webkit-tap-highlight-color: transparent; 
}

/* Fondo geométrico simulado con gradientes */
.geometric-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: -1;
    background-image: 
        radial-gradient(circle at 15% 20%, rgba(255, 179, 186, 0.3), transparent 30%),
        radial-gradient(circle at 85% 40%, rgba(186, 225, 255, 0.3), transparent 30%),
        radial-gradient(circle at 50% 85%, rgba(186, 255, 201, 0.3), transparent 35%);
}

/* Botón Pantalla Completa */
.fullscreen-btn {
    position: absolute;
    top: 20px;
    right: 20px;
    background: white;
    border: none;
    border-radius: 50%;
    width: 50px;
    height: 50px;
    font-size: 1.5rem;
    cursor: pointer;
    box-shadow: 0 4px 10px rgba(0,0,0,0.08);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    z-index: 10;
    color: var(--color-text-dark);
}

.fullscreen-btn:hover, .fullscreen-btn:active {
    transform: scale(1.1);
    box-shadow: 0 6px 15px rgba(0,0,0,0.15);
}

/* Cabecera */
header {
    text-align: center;
    margin-top: 60px;
    margin-bottom: 40px;
    padding: 0 20px;
}

.logo-icon {
    display: inline-block;
    font-size: 5rem;
    /* Animación ligera del logo */
    animation: float 3s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

h1 {
    font-size: 3rem;
    font-weight: 700;
    margin-top: 10px;
    margin-bottom: 5px;
    color: var(--color-text-dark);
}

header p {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--color-text-light);
}

/* Zona Principal y Grid */
main {
    width: 100%;
    max-width: 1200px;
    padding: 0 20px 60px;
}

.app-grid {
    display: grid;
    /* Móvil: 1 columna */
    grid-template-columns: 1fr; 
    gap: 25px;
}

/* Tablet: 2 columnas */
@media (min-width: 600px) {
    .app-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 35px;
    }
}

/* Escritorio: Distribución fluida para aprovechar el espacio */
@media (min-width: 1024px) {
    .app-grid {
        grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
        gap: 40px;
    }
}

/* Tarjetas */
.app-card {
    background: white;
    border-radius: 24px;
    padding: 40px 30px;
    text-align: center;
    text-decoration: none;
    color: var(--color-text-dark);
    box-shadow: 0 8px 20px rgba(0,0,0,0.06);
    transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
    display: flex;
    flex-direction: column;
    align-items: center;
    border-top: 8px solid var(--pastel-blue);
    cursor: pointer;
}

/* Colores alternos para los bordes superiores de las tarjetas */
.app-card:nth-child(1n) { border-top-color: var(--pastel-red); }
.app-card:nth-child(2n) { border-top-color: var(--pastel-green); }
.app-card:nth-child(3n) { border-top-color: var(--pastel-orange); }
.app-card:nth-child(4n) { border-top-color: var(--pastel-blue); }

.app-card:hover, .app-card:active {
    transform: translateY(-8px);
    box-shadow: 0 15px 30px rgba(0,0,0,0.12);
}

.card-icon {
    font-size: 4.5rem;
    margin-bottom: 20px;
}

.app-card h2 {
    font-size: 1.8rem;
    margin-bottom: 12px;
}

.app-card p {
    font-size: 1.1rem;
    font-weight: 400;
    color: var(--color-text-light);
    line-height: 1.5;
}