/* ========================================
   BIBLIOTECA VIRTUAL MAD - STYLES
   Paleta: Azules profesionales blueEnergy
   ======================================== */

:root {
    /* Colores principales */
    --primary-blue: #1e4a7a;
    --primary-light-blue: #4ea8d8;
    --accent-cyan: #7ec8e3;
    --accent-bright-blue: #2b8fcc;
    
    /* Colores complementarios */
    --dark-navy: #0f2847;
    --light-bg: #f5f9fc;
    --white: #ffffff;
    --text-dark: #1a1a1a;
    --text-gray: #6b7280;
    --border-color: #e5e7eb;
    
    /* Sombras */
    --shadow-sm: 0 2px 4px rgba(30, 74, 122, 0.08);
    --shadow-md: 0 4px 12px rgba(30, 74, 122, 0.12);
    --shadow-lg: 0 12px 32px rgba(30, 74, 122, 0.18);
    
    /* Espaciado */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    
    /* Tipografía */
    --font-display: 'Libre Baskerville', serif;
    --font-body: 'Poppins', sans-serif;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font-body);
    color: var(--text-dark);
    background: var(--light-bg);
    line-height: 1.6;
    overflow-x: hidden;
}

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

/* ========================================
   HEADER
   ======================================== */

.header {
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--dark-navy) 100%);
    color: var(--white);
    padding: var(--spacing-md) 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: var(--shadow-md);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.logo-section {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.logo-icon {
    font-size: 2.5rem;
    filter: drop-shadow(0 2px 4px rgba(0,0,0,0.2));
}

.site-title {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 700;
    margin: 0;
}

.site-subtitle {
    font-size: 0.875rem;
    opacity: 0.9;
    margin: 0;
}

.nav {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.nav-link {
    color: var(--white);
    text-decoration: none;
    padding: 0.5rem 1rem;
    border-radius: 0.5rem;
    transition: background 0.3s ease;
}

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

.language-selector {
    display: flex;
    gap: 0.25rem;
    background: rgba(255, 255, 255, 0.1);
    padding: 0.25rem;
    border-radius: 0.5rem;
}

.lang-btn {
    background: transparent;
    border: none;
    color: var(--white);
    padding: 0.4rem 0.75rem;
    border-radius: 0.375rem;
    cursor: pointer;
    font-weight: 500;
    font-size: 0.875rem;
    transition: all 0.3s ease;
}

.lang-btn:hover {
    background: rgba(255, 255, 255, 0.15);
}

.lang-btn.active {
    background: var(--accent-cyan);
    color: var(--primary-blue);
}

/* ========================================
   HERO SECTION
   ======================================== */

.hero {
    position: relative;
    padding: var(--spacing-xl) 0;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(to bottom, rgba(78, 168, 216, 0.1), transparent);
    z-index: -1;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
    animation: fadeInUp 0.8s ease-out;
}

.stat-card {
    background: var(--white);
    padding: var(--spacing-lg);
    border-radius: 1rem;
    text-align: center;
    box-shadow: var(--shadow-md);
    border: 2px solid transparent;
    transition: all 0.3s ease;
}

.stat-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--accent-cyan);
}

.stat-number {
    font-size: 3rem;
    font-weight: 700;
    color: var(--primary-blue);
    font-family: var(--font-display);
    line-height: 1;
}

.stat-label {
    margin-top: 0.5rem;
    color: var(--text-gray);
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* ========================================
   FILTERS SECTION
   ======================================== */

.filters-section {
    background: var(--white);
    padding: var(--spacing-lg) 0;
    margin: var(--spacing-lg) 0;
    border-radius: 1rem;
    box-shadow: var(--shadow-sm);
}

.filters-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
}

.filters-header h2 {
    font-family: var(--font-display);
    color: var(--primary-blue);
    font-size: 1.5rem;
}

.clear-filters-btn {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-gray);
    padding: 0.5rem 1rem;
    border-radius: 0.5rem;
    cursor: pointer;
    font-size: 0.875rem;
    transition: all 0.3s ease;
}

.clear-filters-btn:hover {
    background: var(--accent-cyan);
    color: var(--white);
    border-color: var(--accent-cyan);
}

.filters-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: var(--spacing-sm);
}

.search-input, .filter-select {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    font-family: var(--font-body);
    font-size: 0.9375rem;
    transition: all 0.3s ease;
}

.search-input:focus, .filter-select:focus {
    outline: none;
    border-color: var(--accent-bright-blue);
    box-shadow: 0 0 0 3px rgba(43, 143, 204, 0.1);
}

/* ========================================
   PROJECTS GRID
   ======================================== */

.main-content {
    padding: var(--spacing-xl) 0;
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: var(--spacing-lg);
    animation: fadeIn 0.6s ease-out;
}

.project-card {
    background: var(--white);
    border-radius: 1rem;
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    border: 2px solid transparent;
}

.project-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: var(--accent-cyan);
}

.project-card-header {
    background: linear-gradient(135deg, var(--primary-blue), var(--accent-bright-blue));
    padding: var(--spacing-md);
    color: var(--white);
}

.project-code {
    display: inline-block;
    background: rgba(255, 255, 255, 0.25);
    padding: 0.25rem 0.75rem;
    border-radius: 1rem;
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.05em;
}

.project-title {
    font-family: var(--font-display);
    font-size: 1.125rem;
    margin-top: var(--spacing-sm);
    line-height: 1.4;
}

.project-card-body {
    padding: var(--spacing-md);
}

.project-badges {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: var(--spacing-sm);
}

.badge {
    display: inline-block;
    padding: 0.375rem 0.75rem;
    border-radius: 0.5rem;
    font-size: 0.8125rem;
    font-weight: 500;
}

.badge-program {
    background: rgba(78, 168, 216, 0.15);
    color: var(--primary-blue);
}

.badge-theme {
    background: rgba(126, 200, 227, 0.15);
    color: var(--accent-bright-blue);
}

.project-objective {
    color: var(--text-gray);
    font-size: 0.9375rem;
    line-height: 1.6;
    margin: var(--spacing-sm) 0;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.project-meta {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-sm);
    margin: var(--spacing-sm) 0;
    padding: var(--spacing-sm) 0;
    border-top: 1px solid var(--border-color);
    font-size: 0.875rem;
}

.meta-item strong {
    display: block;
    color: var(--primary-blue);
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 0.25rem;
}

.result-icons {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin: var(--spacing-sm) 0;
}

.result-icon {
    display: flex;
    align-items: center;
    gap: 0.375rem;
    background: var(--light-bg);
    padding: 0.375rem 0.75rem;
    border-radius: 0.5rem;
    font-size: 0.8125rem;
    color: var(--text-gray);
}

.result-icon .icon {
    font-size: 1.125rem;
}

.view-details-btn {
    width: 100%;
    background: var(--primary-blue);
    color: var(--white);
    border: none;
    padding: 0.875rem;
    border-radius: 0.5rem;
    font-weight: 600;
    font-size: 0.9375rem;
    cursor: pointer;
    transition: all 0.3s ease;
}

.view-details-btn:hover {
    background: var(--accent-bright-blue);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(43, 143, 204, 0.3);
}

/* ========================================
   PROJECT DETAIL PAGE
   ======================================== */

.project-detail-page {
    padding: var(--spacing-xl) 0;
}

.back-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--primary-blue);
    text-decoration: none;
    font-weight: 500;
    transition: transform 0.3s ease;
}

.back-btn:hover {
    transform: translateX(-4px);
}

.project-header {
    background: linear-gradient(135deg, var(--primary-blue), var(--accent-bright-blue));
    color: var(--white);
    padding: var(--spacing-xl);
    border-radius: 1rem;
    margin-bottom: var(--spacing-lg);
    box-shadow: var(--shadow-lg);
}

.project-header-badge {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
}

.project-year {
    background: rgba(255, 255, 255, 0.25);
    padding: 0.25rem 0.75rem;
    border-radius: 1rem;
    font-size: 0.875rem;
    font-weight: 600;
}

.project-info-grid {
    display: grid;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.info-card {
    background: var(--white);
    padding: var(--spacing-lg);
    border-radius: 1rem;
    box-shadow: var(--shadow-md);
}

.info-title {
    font-family: var(--font-display);
    color: var(--primary-blue);
    font-size: 1.25rem;
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-sm);
    border-bottom: 2px solid var(--accent-cyan);
}

.info-item {
    margin-bottom: var(--spacing-md);
}

.info-item strong {
    display: block;
    color: var(--primary-blue);
    margin-bottom: 0.5rem;
}

.info-item p {
    color: var(--text-gray);
    line-height: 1.7;
    white-space: pre-wrap;
}

.info-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
}

/* ========================================
   DOCUMENTS SECTION
   ======================================== */

.documents-section {
    margin-top: var(--spacing-xl);
}

.section-title {
    font-family: var(--font-display);
    color: var(--primary-blue);
    font-size: 1.75rem;
    margin-bottom: var(--spacing-lg);
}

.documents-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--spacing-md);
}

.document-card {
    background: var(--white);
    border-radius: 1rem;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
    border: 1px solid var(--border-color);
}

.document-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-4px);
}

.document-thumbnail {
    height: 160px;
    background: linear-gradient(135deg, var(--primary-light-blue), var(--accent-cyan));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3rem;
    color: var(--white);
}

.document-thumbnail img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.document-body {
    padding: var(--spacing-md);
}

.document-type-badge {
    display: inline-block;
    background: var(--accent-cyan);
    color: var(--white);
    padding: 0.25rem 0.75rem;
    border-radius: 0.5rem;
    font-size: 0.75rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.document-language {
    display: inline-block;
    margin-left: 0.5rem;
    padding: 0.25rem 0.5rem;
    background: rgba(30, 74, 122, 0.1);
    color: var(--primary-blue);
    border-radius: 0.375rem;
    font-size: 0.7rem;
}

.document-title {
    font-weight: 600;
    color: var(--text-dark);
    font-size: 1rem;
    margin: 0.5rem 0;
    line-height: 1.4;
}

.document-summary {
    color: var(--text-gray);
    font-size: 0.875rem;
    line-height: 1.5;
    margin: 0.5rem 0;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.document-btn {
    width: 100%;
    background: var(--primary-blue);
    color: var(--white);
    border: none;
    padding: 0.75rem;
    border-radius: 0.5rem;
    font-weight: 500;
    cursor: pointer;
    margin-top: 0.75rem;
    transition: all 0.3s ease;
}

.document-btn:hover {
    background: var(--accent-bright-blue);
}

.document-btn.btn-gallery {
    background: var(--accent-cyan);
}

.document-btn.btn-gallery:hover {
    background: var(--primary-light-blue);
}

/* ========================================
   PDF VIEWER MODAL
   ======================================== */

.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    z-index: 2000;
    animation: fadeIn 0.3s ease;
}

.modal.active {
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-content {
    background: var(--white);
    border-radius: 1rem;
    max-width: 90%;
    max-height: 90%;
    overflow: hidden;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.4);
}

.modal-pdf {
    width: 90vw;
    height: 90vh;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md);
    background: var(--primary-blue);
    color: var(--white);
}

.modal-header h3 {
    margin: 0;
    font-size: 1.125rem;
}

.modal-close {
    background: transparent;
    border: none;
    color: var(--white);
    font-size: 2rem;
    cursor: pointer;
    padding: 0;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform 0.3s ease;
}

.modal-close:hover {
    transform: rotate(90deg);
}

.modal-body {
    height: calc(90vh - 60px);
}

.modal-body iframe {
    width: 100%;
    height: 100%;
    border: none;
}

/* ========================================
   LOADING & STATES
   ======================================== */

.loading-state, .error-state, .no-results-state {
    text-align: center;
    padding: var(--spacing-xl);
}

.spinner {
    border: 4px solid var(--border-color);
    border-top: 4px solid var(--primary-blue);
    border-radius: 50%;
    width: 50px;
    height: 50px;
    animation: spin 1s linear infinite;
    margin: 0 auto var(--spacing-md);
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

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

.footer {
    background: var(--dark-navy);
    color: var(--white);
    padding: var(--spacing-lg) 0;
    margin-top: var(--spacing-xl);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.footer-section h3 {
    margin-bottom: 0.5rem;
}

/* ========================================
   ANIMATIONS
   ======================================== */

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

@media (max-width: 768px) {
    .filters-grid {
        grid-template-columns: 1fr;
    }
    
    .projects-grid {
        grid-template-columns: 1fr;
    }
    
    .info-row {
        grid-template-columns: 1fr;
    }
    
    .header-content {
        flex-direction: column;
        text-align: center;
    }
    
    .site-title {
        font-size: 1.25rem;
    }
}