/* =========================================
   VARIABLES CSS (Paleta y Efectos)
========================================= */
:root {
    --bg-body: #0a0a0a;
    --bg-header: rgba(17, 17, 17, 0.85);
    --bg-card: #141414;
    --text-main: #ffffff;
    
    /* Colores Neón */
    --glow-ingresos: rgba(3, 245, 3, 0.25);
    --accent-ingresos: #03f503;
    
    --glow-gastos: rgba(255, 0, 0, 0.25);
    --accent-gastos: #ff3333;
    
    --glow-balance: rgba(0, 132, 255, 0.25);
    --accent-balance: #3399ff;
}

/* =========================================
   RESET Y ESTILOS BASE
========================================= */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box; /* Fundamental para evitar desbordes */
}

body {
    background-color: var(--bg-body);
    color: var(--text-main);
    font-family: 'Cabin', sans-serif;
    display: flex;
    flex-direction: column;
    align-items: center;
    min-height: 100vh;
}

/* =========================================
   HEADER (Glassmorphism)
========================================= */
.header {
    width: 100%;
    background-color: var(--bg-header);
    backdrop-filter: blur(12px); /* Efecto de cristal esmerilado */
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: center;
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 2rem;
    gap: 1.5rem;
    flex-wrap: wrap; /* Permite que el logo y título se ajusten en móviles */
}

#logo {
    width: 100px;
    height: 100px;
    object-fit: contain;
}
h1{
    font-size: 2rem;
    font-family: 'Oxanium', sans-serif;
    text-align: center;
    background: linear-gradient(90deg, #ffffff, #a3a3a3);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

#titulo {
    /* Tamaño de fuente fluido: crece y se encoge con la pantalla */
    font-size: clamp(1.5rem, 4vw, 2.2rem);
    font-family: 'Oxanium', sans-serif;
    text-align: center;
    background: linear-gradient(90deg, #ffffff, #a3a3a3);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}
/* =========================================
   CONTENEDOR PRINCIPAL (Grid Responsivo)
========================================= */
.container {
    display: grid;
    /* Grid mágico: crea columnas automáticas que no bajan de 250px */
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2.5rem;
    width: 100%;
    max-width: 1100px;
    padding: 4rem 2rem;
    flex-grow: 1;
}

/* =========================================
   TARJETAS (Cards)
========================================= */
.opcion {
    background-color: var(--bg-card);
    border-radius: 20px;
    padding: 3rem 2rem;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 1.5rem;
    transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
    border: 1px solid rgba(255, 255, 255, 0.02);
    cursor: pointer;
}

.opcion h3 {
    font-size: 1.6rem;
    font-family: 'Oxanium', sans-serif;
    letter-spacing: 1px;
}

.icon {
    width: 70px;
    height: 70px;
    transition: transform 0.4s ease;
}

/* --- Efectos Hover y Sombras Neón --- */

/* Ingresos */
.card-ingresos {
    box-shadow: 0 10px 30px var(--glow-ingresos);
    border-bottom: 3px solid var(--accent-ingresos);
    
}
.card-ingresos:hover {
    transform: translateY(-8px);
    box-shadow: 0 15px 40px rgba(3, 245, 3, 0.4);
    border-color: var(--accent-ingresos);
}

/* Gastos */
.card-gastos {
    box-shadow: 0 10px 30px var(--glow-gastos);
    border-bottom: 3px solid var(--accent-gastos);
    
}
.card-gastos:hover {
    transform: translateY(-8px);
    box-shadow: 0 15px 40px rgba(255, 0, 0, 0.4);
    border-color: var(--accent-gastos);
}

/* Balance */
.card-balance {
    box-shadow: 0 10px 30px var(--glow-balance);
    border-bottom: 3px solid var(--accent-balance);
    
}
.card-balance:hover {
    transform: translateY(-8px);
    box-shadow: 0 15px 40px rgba(0, 132, 255, 0.4);
    border-color: var(--accent-balance);
}

/* Animación del icono al hacer hover en la tarjeta */
.opcion:hover .icon {
    transform: scale(1.15) rotate(5deg);
}

h2 {
    font-size: 1.4rem;
    font-family: 'Oxanium', sans-serif;
    text-align: center;
  
   
}