:root {
    --primary-color: #0d2847;
    --secondary-color: #1e5288;
    --accent-color: #d4a317;
    --bg-light: #f5f7fa;
    --text-dark: #22252a;
    --card-bg: #ffffff;
    --border-color: #e2e8f0;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
}

body {
    background-color: var(--bg-light);
    color: var(--text-dark);
    line-height: 1.6;
}

/* Header & Barra Superior */
.top-bar {
    background-color: #081a30;
    color: #c9d6e4;
    padding: 6px 20px;
    font-size: 0.85rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.main-header {
    background-color: var(--primary-color);
    color: white;
    padding: 1.5rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.main-nav {
    display: flex;
    gap: 1.5rem;
}

.main-nav a, .top-bar a {
    color: inherit;
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s;
}

.main-nav a:hover, .top-bar a:hover {
    color: var(--accent-color);
}

/* Hero Institucional */
.hero {
    background: linear-gradient(rgba(13, 40, 71, 0.85), rgba(13, 40, 71, 0.85)), url('https://images.unsplash.com/photo-1562774053-701939374585?auto=format&fit=crop&w=1200&q=80') center/cover;
    color: white;
    padding: 4rem 2rem;
    text-align: center;
}

.hero h2 {
    font-size: 2.3rem;
    margin-bottom: 0.8rem;
}

/* Marquesina de Avisos Destacados */
.banner-alerta {
    background-color: #fff3cd;
    color: #856404;
    border-left: 6px solid var(--accent-color);
    padding: 1rem 2rem;
    margin: 1.5rem auto;
    max-width: 1100px;
    border-radius: 4px;
}

/* Contenedores y Filtros */
.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 2rem 1rem;
}

.filter-bar {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.filter-btn {
    background: white;
    border: 1px solid var(--border-color);
    padding: 0.5rem 1rem;
    border-radius: 20px;
    cursor: pointer;
    font-weight: 600;
}

.filter-btn.active, .filter-btn:hover {
    background-color: var(--secondary-color);
    color: white;
    border-color: var(--secondary-color);
}

/* Grilla de Novedades */
.news-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 1.5rem;
}

.card {
    background: var(--card-bg);
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 4px 6px -1px rgba(0,0,0,0.08);
    display: flex;
    flex-direction: column;
}

.card img {
    width: 100%;
    height: 210px;
    object-fit: cover;
}

.card-content {
    padding: 1.25rem;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.card-badge {
    align-self: flex-start;
    background: #e9ecef;
    color: var(--primary-color);
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    padding: 0.25rem 0.6rem;
    border-radius: 4px;
    margin-bottom: 0.5rem;
}

.card-date {
    font-size: 0.8rem;
    color: #6c757d;
    margin-bottom: 0.5rem;
}

/* Formularios y Panel de Administración */
.admin-card {
    background: white;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 4px 10px rgba(0,0,0,0.05);
    margin-bottom: 2rem;
}

.form-group {
    margin-bottom: 1.2rem;
}

.form-group label {
    display: block;
    font-weight: 600;
    margin-bottom: 0.4rem;
}

.form-group input, .form-group textarea, .form-group select {
    width: 100%;
    padding: 0.7rem;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: 1rem;
}

.btn-primary {
    background-color: var(--secondary-color);
    color: white;
    border: none;
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
    font-weight: bold;
    border-radius: 4px;
    cursor: pointer;
    transition: background-color 0.2s;
}

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

.preview-container img {
    max-width: 250px;
    max-height: 150px;
    margin-top: 10px;
    border-radius: 4px;
    display: none;
    object-fit: cover;
}

/* Footer */
footer {
    background-color: #081a30;
    color: #adb5bd;
    text-align: center;
    padding: 2rem;
    margin-top: 3rem;
}