/* =========================================
   CALISTER - THE WORLD CUP PREDICTION ENGINE
   Diseño: Nebula Code Labs (Lola & Catalina)
   ========================================= */

/* 1. CONFIGURACIÓN DE COLORES Y FUENTES */
:root {
    --primary-blue: #0F172A;   /* Azul Oscuro - Confianza y estabilidad */
    --secondary-green: #2E7D32; /* Verde Césped - La cancha */
    --accent-yellow: #FDD835;  /* Amarillo Brillante - Energía */
    --alert-red: #D32F2F;      /* Rojo - Goles e info crítica */
    --bg-light: #FFFFFF;       /* Blanco - Claridad */
    --text-dark: #1E293B;
    --font-futuristic: 'Rajdhani', sans-serif; /* Toque tecnológico */
}

/* 2. RESET GENERAL */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--bg-light);
    color: var(--text-dark);
    line-height: 1.6;
}

/* 3. NAVEGACIÓN GLOBAL */
header {
    background-color: var(--primary-blue);
    padding: 1rem 5%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 1000;
    border-bottom: 3px solid var(--accent-yellow);
}

.logo-container img {
    height: 45px;
    transition: transform 0.3s;
}

.logo-container img:hover {
    transform: rotate(-5deg) scale(1.1);
}

nav ul {
    list-style: none;
    display: flex;
    gap: 1.5rem;
}

nav ul li a {
    text-decoration: none;
    color: white;
    font-weight: 600;
    font-size: 0.9rem;
    text-transform: uppercase;
    transition: color 0.3s;
}

nav ul li a:hover {
    color: var(--accent-yellow);
}

/* 4. HERO SECTION (Inicio) */
.hero {
    background: linear-gradient(rgba(15, 23, 42, 0.85), rgba(15, 23, 42, 0.85)), 
                url('img/calister-hero.jpg') center/cover no-repeat;
    height: 85vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    color: white;
    padding: 0 10%;
}

.hero h1 {
    font-family: var(--font-futuristic);
    font-size: 5rem;
    color: var(--accent-yellow);
    margin-bottom: 0.5rem;
    text-shadow: 3px 3px 0px var(--secondary-green);
}

.hero p {
    font-size: 1.3rem;
    max-width: 700px;
    margin-bottom: 2.5rem;
}

/* 5. BOTONES (CTA) */
.btn-cta {
    background-color: var(--secondary-green);
    color: white;
    padding: 1rem 2.5rem;
    font-size: 1.2rem;
    font-weight: bold;
    text-decoration: none;
    border-radius: 50px;
    text-transform: uppercase;