:root {
    --primary: #2c3e50;
    --accent: #3498db;
    --bg: #f4f7f6;
    --white: #ffffff;
    --text: #333;
}

body {
    font-family: 'Poppins', sans-serif;
    background-color: var(--bg);
    color: var(--text);
    margin: 0;
}

.container { width: 90%; max-width: 1200px; margin: auto; }

/* Navbar */
.navbar {
    background: var(--primary);
    padding: 1rem 0;
    color: white;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.brand {
    display: flex;
    align-items: center;
    text-decoration: none;
    color: white;
    font-weight: 600;
    font-size: 1.2rem;
}

.brand img { height: 40px; margin-right: 10px; }

/* Hero */
.hero {
    background: linear-gradient(135deg, var(--primary), var(--accent));
    color: white;
    padding: 60px 0;
    text-align: center;
    border-radius: 0 0 50px 50px;
}

/* Sections */
.main-section {
    margin-top: 30px;
    background: var(--white);
    border-radius: 15px;
    overflow: hidden;
    box-shadow: 0 4px 6px rgba(0,0,0,0.05);
}

.section-header {
    background: #eef2f3;
    padding: 20px;
    display: flex;
    align-items: center;
    cursor: pointer;
    transition: background 0.3s;
}

.section-header:hover { background: #e2e8ea; }

.section-header h2 {
    flex-grow: 1;
    margin: 0 15px;
    font-size: 1.1rem;
    text-transform: uppercase;
}

/* Grid & Cards */
.grid-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 20px;
    padding: 20px;
    display: none; /* Oculto por defecto */
}

.card-item {
    text-decoration: none;
    color: var(--text);
    background: var(--white);
    border: 1px solid #eee;
    padding: 25px;
    border-radius: 12px;
    text-align: center;
    transition: transform 0.3s, box-shadow 0.3s;
}

.card-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0,0,0,0.1);
}

.card-item i {
    font-size: 2.5rem;
    display: block;
    margin-bottom: 10px;
    color: var(--accent);
}

.icon-pdf { color: #e74c3c !important; }

/* Footer */
.footer {
    background: var(--primary);
    color: white;
    padding: 40px 0;
    margin-top: 60px;
}

.footer-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
}

@media (max-width: 768px) {
    .footer-grid { grid-template-columns: 1fr; }
}

/* Definición de Variables por defecto */
:root {
    --primary: #2c3e50;
    --accent: #3498db;
    --bg: #f4f7f6;
    --card-bg: #ffffff;
    --text: #333;
    --font-main: 'Poppins', sans-serif;
}

/* Variantes de Temas */
[data-theme="dark"] {
    --primary: #1a1a1a;
    --accent: #9b59b6;
    --bg: #121212;
    --card-bg: #1e1e1e;
    --text: #e0e0e0;
}

[data-theme="warm"] {
    --primary: #8e44ad;
    --accent: #e67e22;
    --bg: #fdf2e9;
    --card-bg: #ffffff;
    --text: #5d4037;
}

body {
    font-family: var(--font-main);
    background-color: var(--bg);
    color: var(--text);
    transition: all 0.3s ease; /* Suaviza el cambio de color */
}

/* Estilos del Panel de Control */
.customizer-panel {
    background: var(--card-bg);
    padding: 10px 0;
    border-bottom: 1px solid rgba(0,0,0,0.1);
    font-size: 0.9rem;
}

.customizer-flex {
    display: flex;
    gap: 20px;
    align-items: center;
}

.btn-theme {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    border: 2px solid #ddd;
    cursor: pointer;
    margin-left: 5px;
}

.btn-theme.default { background: #2c3e50; }
.btn-theme.dark { background: #1a1a1a; }
.btn-theme.warm { background: #e67e22; }

/* Aplicar variables a los elementos */
.navbar, .hero, .footer {
    background: var(--primary);
}

.main-section {
    background: var(--card-bg);
}

.card-item {
    background: var(--card-bg);
    color: var(--text);
}