/* ========================================
   VARIABLES Y COLORES - Tema Periódico
   ======================================== */

:root {
    --primary-color: #201212;
    --secondary-color: #c0392b;
    --bg-light: #f8f7f4;
    --bg-white: #ffffff;
    --text-dark: #2c3e50;
    --text-muted: #7f8c8d;
    --border-color: #ddd;
    --accent-warm: #d35400;
}

/* ========================================
   ESTILOS GENERALES
   ======================================== */

html, body {
    height: 100%;
    background-color: var(--bg-light);
    color: var(--text-dark);
    font-family: 'Segoe UI', 'Georgia', serif;
    font-size: 16px;
    line-height: 1.6;
}

.barra-busqueda {
    justify-content: center;
}

body {
    display: flex;
    flex-direction: column;
}

main {
    flex: 1;
    background-color: var(--bg-light);
}

/* ========================================
   NAVBAR
   ======================================== */

.navbar {
    background-color: var(--bg-white);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

.navbar-brand {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color) !important;
    letter-spacing: 0.5px;
    margin-right: 1rem;
}

.navbar-logo {
    height: 40px;
    width: auto;
    transition: transform 0.2s ease;
}


.navbar-nav .nav-link {
    color: var(--text-dark) !important;
    font-weight: 500;
    margin-left: 1rem;
    transition: color 0.3s ease;
}

.navbar-nav .nav-link:hover {
    color: var(--secondary-color) !important;
}

/* ========================================
   BARRA DE BÚSQUEDA
   ======================================== */

.search-form {
    display: flex;
    align-items: center;
}

.search-input {
    border: 1px solid var(--border-color);
    padding: 0.4rem 0.8rem;
    font-size: 0.9rem;
    border-radius: 20px 0 0 20px;
    background-color: var(--bg-light);
    transition: all 0.3s ease;
    max-width: 200px;
}

.search-input:focus {
    background-color: var(--bg-white);
    box-shadow: 0 0 0 0.2rem rgba(192, 57, 43, 0.15);
    border-color: var(--secondary-color);
    outline: none;
}

.search-input::placeholder {
    color: var(--text-muted);
    font-size: 0.85rem;
}

.btn-search {
    background-color: var(--secondary-color);
    color: var(--bg-white);
    border: 1px solid var(--secondary-color);
    border-radius: 0 20px 20px 0;
    padding: 0.4rem 0.8rem;
    transition: background-color 0.3s ease;
    font-size: 0.9rem;
}

.btn-search:hover {
    background-color: #a03123;
    border-color: #a03123;
    color: var(--bg-white);
}

.input-group .form-control:focus {
    border-color: var(--secondary-color);
}

@media (max-width: 768px) {
    .search-input {
        max-width: 150px;
        font-size: 0.8rem;
        padding: 0.3rem 0.6rem;
    }

    .search-form {
        margin-top: 0.5rem;
    }
}

/* ========================================
   TIPOGRAFÍA Y ESTRUCTURA
   ======================================== */

h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

h1 {
    letter-spacing: 1px;
    border-bottom: 2px solid var(--secondary-color);
    padding-bottom: 0.5rem;
}

p {
    color: var(--text-dark);
    line-height: 1.8;
}

a {
    color: var(--secondary-color);
    text-decoration: none;
    transition: color 0.3s ease;
}

a:hover {
    color: var(--accent-warm);
}

/* ========================================
   IMAGEN DE TÍTULO
   ======================================== */

.header-title-image {
    max-width: 100%;
    height: auto;
    max-height: 200px;
    display: block;
    transition: transform 0.3s ease;
}

@media (max-width: 768px) {
    .header-title-image {
        max-height: 150px;
    }
}

/* ========================================
   ARTÍCULOS - GRID Y TARJETAS
   ======================================== */

.article-container {
    padding: 2rem 0;
}

.article-card {
    background-color: var(--bg-white);
    border: 1px solid var(--border-color);
    border-radius: 0;
    padding: 1.5rem;
    height: 100%;
    display: flex;
    flex-direction: column;
    transition: box-shadow 0.3s ease, transform 0.2s ease;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

.article-card:hover {
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    transform: translateY(-2px);
}

.article-card-link {
    color: inherit;
    text-decoration: none;
    display: block;
    height: 100%;
}

.article-card-link:hover {
    color: inherit;
    text-decoration: none;
}

.article-card h3 {
    font-size: 1.4rem;
    margin-bottom: 0.8rem;
    color: var(--primary-color);
    border-bottom: 2px solid var(--secondary-color);
    padding-bottom: 0.5rem;
}

.article-excerpt {
    color: var(--text-dark);
    font-size: 0.95rem;
    margin-bottom: 1rem;
    flex-grow: 1;
    line-height: 1.7;
}

.article-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
    font-size: 0.85rem;
    color: var(--text-muted);
    flex-wrap: wrap;
}

.article-author {
    font-weight: 500;
    color: var(--primary-color);
}

.article-date {
    color: var(--text-muted);
}

.reading-time {
    background-color: #f0f0f0;
    padding: 0.3rem 0.6rem;
    border-radius: 3px;
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* ========================================
   ETIQUETAS (TAGS)
   ======================================== */

.tag-badge {
    display: inline-block;
    background-color: var(--bg-light);
    border: 1px solid var(--border-color);
    color: var(--text-dark);
    padding: 0.3rem 0.7rem;
    border-radius: 20px;
    font-size: 0.8rem;
    margin-right: 0.3rem;
    margin-bottom: 0.5rem;
    transition: all 0.2s ease;
    cursor: pointer;
}

.tag-badge:hover {
    background-color: var(--secondary-color);
    color: var(--bg-white);
    border-color: var(--secondary-color);
}

.tag-badge.active {
    background-color: var(--secondary-color);
    color: var(--bg-white);
    border-color: var(--secondary-color);
}

/* Tags Filter Section */
#tags-container {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
    padding: 1rem 0;
}

#tags-container .tag-badge {
    margin-right: 0;
    margin-bottom: 0.5rem;
}

/* ========================================
   FOOTER
   ======================================== */

footer {
    background-color: var(--primary-color);
    color: var(--bg-light);
    margin-top: auto;
    padding: 2rem;
    border-top: 3px solid var(--secondary-color);
}

footer h5 {
    color: var(--bg-light);
    font-size: 1rem;
    margin-bottom: 1rem;
    font-weight: 700;
}

footer p {
    color: var(--bg-light);
    font-size: 0.95rem;
    margin-bottom: 0.5rem;
}

footer a {
    color: #fff;
    text-decoration: none;
    transition: color 0.3s ease;
}

footer a:hover {
    color: var(--accent-warm);
}

.footer-section {
    margin-bottom: 2rem;
}

.social-links {
    display: flex;
    gap: 1rem;
    margin-top: 0.5rem;
}

.social-links a {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background-color: rgba(255, 255, 255, 0.1);
    border-radius: 4px;
    transition: background-color 0.3s ease;
}

.social-links a:hover {
    background-color: var(--secondary-color);
    color: #fff;
}

.footer-divider {
    border-top: 1px solid rgba(255, 255, 255, 0.2);
    margin-top: 2rem;
    padding-top: 1.5rem;
}

.footer-bottom {
    font-size: 0.85rem;
    text-align: center;
    color: rgba(255, 255, 255, 0.8);
}

/* ========================================
   RESPONSIVE DESIGN
   ======================================== */

@media (max-width: 768px) {
    h1 {
        font-size: 2rem;
    }

    .article-card {
        padding: 1rem;
    }

    .article-card h3 {
        font-size: 1.1rem;
    }

    .article-meta {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.5rem;
    }

    .navbar-nav .nav-link {
        margin-left: 0;
        padding: 0.5rem 0;
    }

    #tags-container {
        justify-content: flex-start;
    }

    footer {
        padding: 1.5rem;
    }
}

/* ========================================
   PRINT STYLES
   ======================================== */

@media print {
    body {
        background-color: white;
    }

    .article-card {
        page-break-inside: avoid;
    }

    a {
        text-decoration: underline;
    }
}