/* --- VARIABLES DE COLOR (Fácil de personalizar) --- */
:root {
    --bg-color-light: #f4f7f9;
    --card-color-light: #ffffff;
    --text-color-light: #2c3e50;
    --header-color-light: #34495e;
    --accent-color: #3498db;
    --shadow-color-light: rgba(0, 0, 0, 0.08);

    --bg-color-dark: #1a1a2e;
    --card-color-dark: #16213e;
    --text-color-dark: #e0e0e0;
    --header-color-dark: #ffffff;
    --shadow-color-dark: rgba(0, 0, 0, 0.2);
}

/* --- ESTILOS GENERALES Y RESET --- */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    /* Define los colores según el tema */
    --bg-color: var(--bg-color-light);
    --card-color: var(--card-color-light);
    --text-color: var(--text-color-light);
    --header-color: var(--header-color-light);
    --shadow-color: var(--shadow-color-light);
}

html[data-theme='dark'] {
    --bg-color: var(--bg-color-dark);
    --card-color: var(--card-color-dark);
    --text-color: var(--text-color-dark);
    --header-color: var(--header-color-dark);
    --shadow-color: var(--shadow-color-dark);
}

body {
    font-family: 'Poppins', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 2rem;
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* --- CONTENEDOR PRINCIPAL Y CABECERA --- */
.container {
    width: 100%;
    max-width: 900px;
    text-align: center;
}

header {
    margin-bottom: 3rem;
    display: flex;
    flex-direction: column;
    align-items: flex-start; /* This is the key property for left-alignment */
}

.logo {
    width: 60px;
    margin-bottom: 1rem;
    filter: invert(var(--logo-invert, 0)); /* Se invertirá en tema oscuro */
}

html[data-theme='dark'] .logo {
    --logo-invert: 1;
}

h1 {
    font-size: 2.5rem;
    font-weight: 600;
    color: var(--header-color);
    margin-bottom: 0.5rem;
}

p {
    font-size: 1.1rem;
    font-weight: 300;
    color: var(--text-color);
}


/* --- GRID DE ENLACES --- */
.link-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
}

.link-card {
    background-color: var(--card-color);
    border-radius: 12px;
    padding: 1.5rem;
    text-decoration: none;
    color: var(--text-color);
    
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    
    box-shadow: 0 4px 15px var(--shadow-color);
    transition: transform 0.2s ease-in-out, box-shadow 0.2s ease-in-out;
}

.link-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 10px 25px var(--shadow-color);
}

.link-card i {
    font-size: 1.5rem;
    color: var(--accent-color);
}

.link-card span {
    font-size: 1.1rem;
    font-weight: 400;
}


/* --- INTERRUPTOR DE TEMA --- */
.theme-switcher {
    position: absolute;
    top: 20px;
    right: 20px;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}
.switch {
    position: relative;
    display: inline-block;
    width: 50px;
    height: 26px;
}
.switch input {
    opacity: 0;
    width: 0;
    height: 0;
}
.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: #ccc;
    transition: .4s;
    border-radius: 26px;
}
.slider:before {
    position: absolute;
    content: "";
    height: 18px;
    width: 18px;
    left: 4px;
    bottom: 4px;
    background-color: white;
    transition: .4s;
    border-radius: 50%;
}
input:checked + .slider {
    background-color: var(--accent-color);
}
input:checked + .slider:before {
    transform: translateX(24px);
}


/* --- FOOTER --- */
footer {
    margin-top: 4rem;
    padding-top: 1rem;
    border-top: 1px solid var(--shadow-color);
}

footer p {
    font-size: 0.9rem;
    font-weight: 300;
}

/* --- DISEÑO RESPONSIVO --- */
@media (max-width: 600px) {
    h1 {
        font-size: 2rem;
    }
    .link-grid {
        grid-template-columns: 1fr;
    }
}