:root {
    --primary-color: #3498db;
    --secondary-color: #2c3e50;
    --accent-color: #e74c3c;
    --bg-color: #f5f5f5;
    --text-color: #333;
    --header-bg: #fff;
    --footer-bg: #fff;
    --sidebar-bg: #2c3e50;
    --sidebar-text: #fff;
    --shadow: 0 2px 10px rgba(0,0,0,0.1);
    --transition: all 0.3s ease;
    --border-radius: 8px;
    --sidebar-width: 280px;
}

.dark-mode {
    --primary-color: #3498db;
    --secondary-color: #34495e;
    --accent-color: #e74c3c;
    --bg-color: #1a1a1a;
    --text-color: #e0e0e0;
    --header-bg: #2d2d2d;
    --footer-bg: #2d2d2d;
    --sidebar-bg: #2d2d2d;
    --sidebar-text: #e0e0e0;
    --shadow: 0 2px 10px rgba(0,0,0,0.3);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    transition: var(--transition);
}

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

.container {
    display: flex;
    min-height: 100vh;
}

/* Estilos del menú lateral */
.sidebar {
    width: var(--sidebar-width);
    background-color: var(--sidebar-bg);
    color: var(--sidebar-text);
    position: fixed;
    height: 100%;
    overflow-y: auto;
    overflow-x: hidden;
    transform: translateX(-100%);
    z-index: 1000;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.sidebar.active {
    transform: translateX(0);
}

.sidebar-header {
    padding: 20px;
    border-bottom: 1px solid rgba(255,255,255,0.1);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.sidebar-header h2 {
    font-size: 1.5rem;
}

.close-btn {
    background: none;
    border: none;
    color: var(--sidebar-text);
    font-size: 1.5rem;
    cursor: pointer;
    padding: 5px;
}

.sidebar-menu {
    list-style: none;
    padding: 0;
}

.sidebar-menu li {
    border-bottom: 1px solid rgba(255,255,255,0.05);
    position: relative;
}

.sidebar-menu a {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 20px;
    color: var(--sidebar-text);
    text-decoration: none;
    transition: var(--transition);
}

.sidebar-menu a:hover {
    background-color: rgba(255,255,255,0.1);
    padding-left: 25px;
}

.menu-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
}

.menu-arrow {
    font-size: 0.8rem;
    transition: transform 0.3s ease;
}

.menu-arrow.rotated {
    transform: rotate(90deg);
}

.menu-icon {
    margin-right: 10px;
    font-size: 1.2rem;
    min-width: 20px;
    text-align: center;
}

.submenu {
    list-style: none;
    background-color: rgba(0,0,0,0.2);
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

.submenu.active {
    max-height: 500px;
}

.submenu li a {
    padding-left: 40px;
    font-size: 0.9rem;
}

.submenu li a:hover {
    background-color: rgba(255,255,255,0.05);
}

/* Estilos del contenido principal */
.main-content {
    flex: 1;
    padding: 20px;
    width: 100%;
    transition: margin-left 0.3s ease;
}

.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 20px;
    background-color: var(--header-bg);
    box-shadow: var(--shadow);
    border-radius: var(--border-radius);
    margin-bottom: 20px;
}

.menu-toggle {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-color);
    padding: 5px 10px;
    border-radius: 4px;
}

.menu-toggle:hover {
    background-color: rgba(0,0,0,0.05);
}

.theme-toggle {
    background: var(--primary-color);
    border: none;
    padding: 8px 15px;
    border-radius: 20px;
    color: white;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 5px;
}

.content {
    background-color: var(--header-bg);
    padding: 25px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    margin-bottom: 20px;
    min-height: 400px;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 20px;
    margin: 25px 0;
}

.feature-card {
    background-color: var(--bg-color);
    padding: 20px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    border-left: 4px solid var(--primary-color);
}

.feature-card h3 {
    color: var(--primary-color);
    margin-bottom: 10px;
}

.footer {
    background-color: var(--footer-bg);
    padding: 20px;
    text-align: center;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin: 15px 0;
}

.footer-links a {
    color: var(--primary-color);
    text-decoration: none;
}

.footer-links a:hover {
    text-decoration: underline;
}

/* Overlay para móviles y escritorio */
.overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.5);
    z-index: 999;
    display: none;
}

.overlay.active {
    display: block;
}

/* Estilos responsive */
@media (min-width: 768px) {
    .sidebar {
        /* En escritorio también empieza oculto */
        transform: translateX(-100%);
    }
    
    .sidebar.active {
        transform: translateX(0);
    }
    
    .main-content {
        margin-left: 0;
    }
}

@media (max-width: 767px) {
    .features-grid {
        grid-template-columns: 1fr;
    }
}