/* Variables globales */
body,
html {
    height: 100%;
    margin: 0;
    display: flex;
    flex-direction: column;
}

main {
    flex: 1;
}

:root {
    --color-primary: #3B82F6;
    --color-primary-dark: #2563EB;
    --color-primary-light: #93C5FD;
    --color-accent: #8B5CF6;
    --color-accent-dark: #7C3AED;
    --color-success: #10B981;
    --color-error: #EF4444;
    --color-warning: #F59E0B;
    --color-text: #1F2937;
    --color-text-light: #6B7280;
    --color-background: #F9FAFB;
    --color-card: #FFFFFF;
    --color-border: #E5E7EB;
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-xxl: 48px;
    --border-radius: 8px;
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --transition: all 0.3s ease;
}

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

body {
    font-family: var(--font-family);
    line-height: 1.5;
    color: var(--color-text);
    background-color: var(--color-background);
}

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: var(--transition);
}

a:hover {
    color: var(--color-primary-dark);
}

ul {
    list-style: none;
}

img {
    max-width: 100%;
    height: auto;
}

/* Layout y contenedores */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* Header y navegación */
header {
    background-color: var(--color-primary);
    color: white;
    padding: var(--spacing-md) 0;
    box-shadow: var(--shadow-md);
    position: sticky;
    top: 0;
    z-index: 100;
}

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

header h1 {
    font-size: 1.5rem;
    font-weight: 700;
}

nav ul {
    display: flex;
    gap: var(--spacing-md);
}

nav li a {
    color: white;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--border-radius);
    transition: var(--transition);
    font-weight: 500;
}

nav li a:hover,
nav li a.active {
    background-color: rgba(255, 255, 255, 0.15);
}

.menu-toggle {
    display: none;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: var(--spacing-sm);
}

.menu-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background-color: white;
    margin: 5px 0;
    transition: var(--transition);
}

@media (max-width: 768px) {
    .menu-toggle {
        display: block;
    }

    nav {
        width: 100%;
        max-height: 0;
        overflow: hidden;
        transition: max-height 0.5s ease;
    }

    nav.open {
        max-height: 200px;
    }

    nav ul {
        flex-direction: column;
        margin-top: var(--spacing-md);
    }
}

/* Sección de Posts */
#posts {
    margin-bottom: var(--spacing-xl);
}

.posts-container {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
    margin-top: var(--spacing-lg);
}

@media (min-width: 640px) {
    .posts-container {
        grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    }
}

article {
    background-color: var(--color-card);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
    padding: var(--spacing-lg);
    border: 1px solid var(--color-border);
    transition: var(--transition);
}

article:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

article h3 {
    color: var(--color-text);
    margin-bottom: var(--spacing-md);
    font-size: 1.25rem;
    line-height: 1.3;
}

article p {
    color: var(--color-text-light);
    margin-bottom: var(--spacing-md);
    font-size: 0.95rem;
    line-height: 1.6;
}

small {
    color: var(--color-text-light);
    font-size: 0.875rem;
}

.btn-leer {
    background-color: var(--color-primary);
    color: white;
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--border-radius);
    font-weight: 500;
    transition: var(--transition);
}

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

.no-posts {
    background-color: var(--color-card);
    border-radius: var(--border-radius);
    padding: var(--spacing-xl);
    text-align: center;
    border: 1px dashed var(--color-border);
}

.no-posts p:first-child {
    font-size: 1.1rem;
    font-weight: 500;
    margin-bottom: var(--spacing-md);
}

.no-posts p:last-child {
    color: var(--color-text-light);
}

/* Formulario de posts */
.form-container {
    background-color: var(--color-card);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-md);
    padding: var(--spacing-xl);
    border: 1px solid var(--color-border);
    position: sticky;
    top: calc(60px + var(--spacing-xl));
}

.form-container h2 {
    margin-bottom: var(--spacing-lg);
    color: var(--color-text);
    font-size: 1.35rem;
}

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

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

input,
textarea {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    font-family: var(--font-family);
    font-size: 1rem;
    transition: var(--transition);
}

input:focus,
textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--color-primary-light);
}

textarea {
    resize: vertical;
}

.btn-publicar {
    background-color: var(--color-accent);
    color: white;
    border: none;
    border-radius: var(--border-radius);
    padding: var(--spacing-sm) var(--spacing-xl);
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: var(--transition);
    display: block;
    width: 100%;
    margin-top: var(--spacing-lg);
}

.btn-publicar:hover {
    background-color: var(--color-accent-dark);
    transform: translateY(-1px);
}

footer {
    background-color: #000;
    /* fondo negro */
    color: #fff;
    /* texto blanco */
    text-align: center;
    padding: 2rem 1rem;
    margin-top: 4rem;
}

.footer-contacto {
    margin-bottom: 1.5rem;
}

.footer-contacto h3 {
    margin-bottom: 0.5rem;
    font-size: 1.2rem;
    color: #f1f1f1;
}

.footer-contacto p {
    margin: 0.3rem 0;
    font-size: 0.95rem;
}

.footer-derechos {
    border-top: 1px solid #444;
    padding-top: 1rem;
    font-size: 0.85rem;
    color: #aaa;
}