/* Estilos globales de la aplicación */
:root {
    --primary-color: #007bff;
    --secondary-color: #6c757d;
    --success-color: #28a745;
    --danger-color: #dc3545;
    --light-color: #f8f9fa;
    --dark-color: #343a40;
    --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

body {
    font-family: var(--font-family);
    margin: 0;
    background-color: #f4f7f6;
    color: var(--dark-color);
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem;
}

/* Header */
.app-header {
    background-color: #fff;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    padding: 1rem 0;
    margin-bottom: 2rem;
}

.app-header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo a {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--primary-color);
    text-decoration: none;
}

.main-nav a {
    margin-left: 1.5rem;
    text-decoration: none;
    color: var(--dark-color);
    font-weight: 500;
}
.main-nav a.active {
    color: var(--primary-color);
}

/* Formularios de autenticación */
.auth-container {
    max-width: 400px;
    margin-top: 4rem;
    text-align: center;
    background: #fff;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 0 20px rgba(0,0,0,0.1);
}

.auth-form .form-group {
    margin-bottom: 1rem;
    text-align: left;
}

.auth-form label {
    display: block;
    margin-bottom: .5rem;
}

.auth-form input {
    width: 100%;
    padding: .75rem;
    border: 1px solid #ccc;
    border-radius: 4px;
}

.auth-switch {
    margin-top: 1.5rem;
}

/* Botones */
.btn {
    display: inline-block;
    padding: .75rem 1.5rem;
    border-radius: 5px;
    text-decoration: none;
    color: #fff;
    background-color: var(--secondary-color);
    border: none;
    cursor: pointer;
    font-size: 1rem;
}

.btn-primary {
    background-color: var(--primary-color);
}

/* Mensajes Flash */
.flash {
    padding: 1rem;
    margin-bottom: 1rem;
    border-radius: 5px;
    border: 1px solid transparent;
}
.flash-success {
    color: #155724;
    background-color: #d4edda;
    border-color: #c3e6cb;
}
.flash-error {
    color: #721c24;
    background-color: #f8d7da;
    border-color: #f5c6cb;
}

/* Grid de Herramientas */
.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.5rem;
}

.tool-card {
    background: #fff;
    border-radius: 8px;
    padding: 1.5rem;
    box-shadow: 0 4px 6px rgba(0,0,0,0.05);
    text-align: center;
    transition: transform 0.2s, box-shadow 0.2s;
}

.tool-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 12px rgba(0,0,0,0.1);
}

.tool-card .tool-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.tool-card h2 {
    font-size: 1.25rem;
    margin: 0.5rem 0;
}

.tool-card p {
    color: #666;
    font-size: 0.9rem;
    margin-bottom: 1rem;
}

/* Not Found */
.not-found {
    text-align: center;
    padding: 4rem 0;
}

.subtitle {
    font-size: 1.5rem;
    font-weight: bold;
    margin-top: 2rem;
    margin-bottom: 1rem;
    border-bottom: 2px solid #eee;
    padding-bottom: 0.5rem;
}