/* Reset y variables */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --color-primary: #0066cc;
    --color-secondary: #004999;
    --color-success: #28a745;
    --color-danger: #dc3545;
    --color-warning: #ffc107;
    --color-dark: #212529;
    --color-light: #f8f9fa;
    --color-border: #dee2e6;

    --font-main: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --font-heading: Georgia, "Times New Roman", serif;

    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;

    --border-radius: 0.375rem;
    --transition: all 0.3s ease;
}

body {
    font-family: var(--font-main);
    font-size: 16px;
    line-height: 1.6;
    color: var(--color-dark);
    background-color: var(--color-light);
    position: relative;
}

body::before {
    content: '';
    position: fixed;
    inset: 0;
    background: url('../assets/images/backgrounds/intro.png') center center / cover no-repeat;
    opacity: 0.12;
    pointer-events: none;
    z-index: -1;
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.container-narrow {
    max-width: 600px;
}

/* Navegación */
nav {
    background-color: var(--color-primary);
    padding: var(--spacing-md) 0;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

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

nav a {
    color: white;
    text-decoration: none;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--border-radius);
    transition: var(--transition);
}

nav a:hover {
    background-color: var(--color-secondary);
}

/* Botones */
.btn {
    display: inline-block;
    padding: var(--spacing-sm) var(--spacing-lg);
    border: none;
    border-radius: var(--border-radius);
    font-size: 1rem;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
    text-align: center;
}

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

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

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

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

.btn-secondary {
    background-color: #6c757d;
    color: white;
}

.btn-secondary:hover {
    background-color: #5a6268;
}

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

.btn-warning:hover {
    background-color: #e0a800;
}

.btn-success:hover {
    background-color: #218838;
}

.btn-danger:hover {
    background-color: #c82333;
}

.btn-block {
    display: block;
    width: 100%;
}

/* Formularios */
.form-group {
    margin-bottom: var(--spacing-md);
}

label {
    display: block;
    margin-bottom: var(--spacing-xs);
    font-weight: 500;
}

input[type="text"],
input[type="email"],
input[type="password"],
textarea,
select {
    width: 100%;
    padding: var(--spacing-sm);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-family: var(--font-main);
}

input:focus,
textarea:focus,
select:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(0, 102, 204, 0.1);
}

/* Cards */
.card {
    background: white;
    border-radius: var(--border-radius);
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
}

.card-title {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-md);
    font-family: var(--font-heading);
}

/* Mensajes */
.alert {
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    margin-bottom: var(--spacing-md);
}

.alert-success {
    background-color: #d4edda;
    border: 1px solid #c3e6cb;
    color: #155724;
}

.alert-error {
    background-color: #f8d7da;
    border: 1px solid #f5c6cb;
    color: #721c24;
}

.alert-info {
    background-color: #d1ecf1;
    border: 1px solid #bee5eb;
    color: #0c5460;
}

/* Utilidades */
.text-center { text-align: center; }
.text-right { text-align: right; }
.mt-1 { margin-top: var(--spacing-sm); }
.mt-2 { margin-top: var(--spacing-md); }
.mt-3 { margin-top: var(--spacing-lg); }
.mb-1 { margin-bottom: var(--spacing-sm); }
.mb-2 { margin-bottom: var(--spacing-md); }
.mb-3 { margin-bottom: var(--spacing-lg); }

/* Selector de idioma en navbar */
.lang-selector {
    display: inline-flex;
    align-items: center;
    margin-left: var(--spacing-md);
}

.lang-selector select {
    width: auto;
    padding: 4px 8px;
    font-size: 0.85rem;
    border: 1px solid rgba(255,255,255,0.3);
    border-radius: var(--border-radius);
    background-color: var(--color-secondary);
    color: white;
    cursor: pointer;
}

.lang-selector select:focus {
    border-color: white;
    box-shadow: 0 0 0 2px rgba(255,255,255,0.2);
}

.lang-selector select option {
    background-color: var(--color-primary);
    color: white;
}

/* Responsive */
@media (max-width: 768px) {
    nav .container {
        flex-direction: column;
        gap: var(--spacing-sm);
    }

    .container {
        padding: 0 var(--spacing-sm);
    }
}