:root {
    --principal-color-yellow: rgb(246, 194, 45);
    --principal-color-blue: rgb(0, 88, 168);
    --light-gray: #f5f5f5;
    --dark-gray: #333;
    --white: #ffffff;
    --shadow: 0 2px 10px rgba(0,0,0,0.1);
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--dark-gray);
    background-color: var(--light-gray);
}

/* Header */
.header {
    background-color: var(--principal-color-blue);
    color: var(--white);
    padding: 1rem 5%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: var(--shadow);
    flex-wrap: wrap;
    gap: 1rem;
}

.logo-container {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.logo {
    height: 50px;
    width: auto;
}

.institucion-nombre {
    font-size: 1.2rem;
    font-weight: 500;
}

.nav-menu {
    display: flex;
    gap: 2rem;
    flex-wrap: wrap;
}

.nav-menu a {
    color: var(--white);
    text-decoration: none;
    padding: 0.5rem 0;
    border-bottom: 2px solid transparent;
    transition: border-color 0.3s;
}

.nav-menu a:hover,
.nav-menu a.active {
    border-bottom-color: var(--principal-color-yellow);
}

.user-info {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.user-role {
    background-color: var(--principal-color-yellow);
    color: var(--principal-color-blue);
    padding: 0.3rem 1rem;
    border-radius: 20px;
    font-weight: bold;
}

.btn-login {
    background-color: transparent;
    color: var(--white);
    border: 2px solid var(--principal-color-yellow);
    padding: 0.5rem 1.5rem;
    border-radius: 5px;
    cursor: pointer;
    transition: all 0.3s;
}

.btn-login:hover {
    background-color: var(--principal-color-yellow);
    color: var(--principal-color-blue);
}

.btn-logout {
    background-color: #dc3545;
    color: var(--white);
    border: none;
    padding: 0.5rem 1.5rem;
    border-radius: 5px;
    cursor: pointer;
    transition: background 0.3s;
    text-decoration: none;
    font-size: 0.9rem;
}

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

/* Hero Section */
.hero-section {
    background: linear-gradient(135deg, var(--principal-color-blue) 0%, #002b5e 100%);
    color: var(--white);
    padding: 4rem 5%;
    text-align: center;
}

.hero-content h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.hero-content p {
    font-size: 1.2rem;
    margin-bottom: 2rem;
    opacity: 0.9;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

.btn-primary {
    background-color: var(--principal-color-yellow);
    color: var(--principal-color-blue);
    border: none;
    padding: 1rem 2rem;
    border-radius: 5px;
    font-weight: bold;
    cursor: pointer;
    transition: transform 0.3s;
    text-decoration: none;
    display: inline-block;
}

.btn-primary:hover {
    transform: translateY(-2px);
}

.btn-secondary {
    background-color: transparent;
    color: var(--white);
    border: 2px solid var(--principal-color-yellow);
    padding: 1rem 2rem;
    border-radius: 5px;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.3s;
    text-decoration: none;
    display: inline-block;
}

.btn-secondary:hover {
    background-color: var(--principal-color-yellow);
    color: var(--principal-color-blue);
}

/* Main Content */
.main-content {
    padding: 3rem 5%;
    max-width: 1400px;
    margin: 0 auto;
}

/* Search Section */
.search-section {
    background-color: var(--white);
    padding: 2rem;
    border-radius: 10px;
    margin-bottom: 2rem;
    box-shadow: var(--shadow);
}

.search-section h3 {
    color: var(--principal-color-blue);
    margin-bottom: 1rem;
}

.search-container {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.search-container input {
    flex: 1;
    padding: 0.8rem;
    border: 2px solid #ddd;
    border-radius: 5px;
    font-size: 1rem;
    min-width: 200px;
}

.filter-select {
    padding: 0.8rem;
    border: 2px solid #ddd;
    border-radius: 5px;
    min-width: 150px;
}

.btn-search {
    background-color: var(--principal-color-blue);
    color: var(--white);
    border: none;
    padding: 0.8rem 2rem;
    border-radius: 5px;
    cursor: pointer;
    transition: background 0.3s;
}

.btn-search:hover {
    background-color: #0066c4;
}

/* Categories */
.categories-section {
    margin-bottom: 3rem;
}

.categories-section h3 {
    color: var(--principal-color-blue);
    margin-bottom: 1rem;
}

.categories-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
}

.category-card {
    background-color: var(--white);
    padding: 1.5rem;
    border-radius: 8px;
    text-align: center;
    box-shadow: var(--shadow);
    transition: transform 0.3s;
    border-left: 4px solid var(--principal-color-yellow);
    text-decoration: none;
    color: var(--dark-gray);
}

.category-card:hover {
    transform: translateY(-3px);
}

.category-card h4 {
    color: var(--principal-color-blue);
    margin-bottom: 0.5rem;
}

.category-card p {
    font-size: 0.9rem;
    color: #666;
}

/* Documents Grid */
.recent-documents h3 {
    color: var(--principal-color-blue);
    margin-bottom: 1rem;
}

.documents-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
}

.document-card {
    background-color: var(--white);
    border-radius: 8px;
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
    box-shadow: var(--shadow);
    transition: transform 0.3s;
}

.document-card:hover {
    transform: translateY(-3px);
}

.doc-icon {
    font-size: 2.5rem;
    color: var(--principal-color-blue);
    text-align: center;
}

.doc-info {
    flex: 1;
}

.doc-info h4 {
    color: var(--principal-color-blue);
    margin-bottom: 0.3rem;
    font-size: 1rem;
}

.doc-author {
    font-size: 0.9rem;
    color: #666;
    margin: 0.2rem 0;
}

.doc-meta {
    font-size: 0.8rem;
    color: #999;
    margin: 0.2rem 0;
}

.doc-type {
    background-color: var(--principal-color-yellow);
    color: var(--principal-color-blue);
    padding: 0.2rem 0.8rem;
    border-radius: 15px;
    font-size: 0.8rem;
    font-weight: bold;
    display: inline-block;
    margin-top: 0.3rem;
}

.doc-category {
    display: inline-block;
    background: #e8f0fe;
    color: var(--principal-color-blue);
    padding: 0.2rem 0.8rem;
    border-radius: 15px;
    font-size: 0.8rem;
    margin-top: 0.3rem;
}

.doc-actions {
    display: flex;
    gap: 0.5rem;
    margin-top: 0.5rem;
}

.btn-view {
    background: #e3f2fd;
    color: #1976d2;
    padding: 0.3rem 0.8rem;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    text-decoration: none;
    font-size: 0.9rem;
    transition: opacity 0.3s;
}

.btn-view:hover {
    opacity: 0.8;
}

.btn-download {
    background-color: var(--principal-color-blue);
    color: var(--white);
    border: none;
    padding: 0.3rem 0.8rem;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.9rem;
    text-decoration: none;
    transition: opacity 0.3s;
}

.btn-download:hover {
    opacity: 0.8;
}

/* =============================================
   NUEVOS ESTILOS PARA PÁGINAS ADICIONALES
   ============================================= */

/* Document Detail */
.document-detail {
    background: var(--white);
    border-radius: 10px;
    padding: 2rem;
    box-shadow: var(--shadow);
    max-width: 800px;
    margin: 0 auto;
}

.detail-header {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 2px solid #eee;
    flex-wrap: wrap;
}

.detail-header h2 {
    color: var(--principal-color-blue);
    margin: 0;
    flex: 1;
}

.btn-back {
    color: var(--principal-color-blue);
    text-decoration: none;
    font-weight: 500;
    padding: 0.5rem 1rem;
    border: 2px solid var(--principal-color-blue);
    border-radius: 5px;
    transition: all 0.3s;
}

.btn-back:hover {
    background: var(--principal-color-blue);
    color: var(--white);
}

.detail-content {
    display: grid;
    gap: 2rem;
}

.detail-info {
    display: grid;
    gap: 1rem;
}

.info-row {
    display: grid;
    grid-template-columns: 150px 1fr;
    gap: 1rem;
    padding: 0.5rem 0;
    border-bottom: 1px solid #f0f0f0;
}

.info-row.description {
    grid-template-columns: 1fr;
}

.info-row.description p {
    margin: 0.5rem 0 0 0;
    padding: 1rem;
    background: var(--light-gray);
    border-radius: 5px;
    line-height: 1.6;
}

.detail-actions {
    text-align: center;
    padding: 2rem;
    background: var(--light-gray);
    border-radius: 8px;
    margin-top: 1rem;
}

.btn-download-large {
    display: inline-block;
    background: var(--principal-color-blue);
    color: var(--white);
    padding: 1rem 3rem;
    border-radius: 8px;
    text-decoration: none;
    font-size: 1.2rem;
    font-weight: bold;
    transition: transform 0.3s, box-shadow 0.3s;
}

.btn-download-large:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,88,168,0.3);
}

.file-info {
    margin-top: 1rem;
    color: #666;
    font-size: 0.9rem;
}

/* Search Results */
.search-results {
    max-width: 1200px;
    margin: 0 auto;
}

.results-info {
    margin: 1.5rem 0;
    padding: 1rem;
    background: var(--light-gray);
    border-radius: 5px;
}

.results-info p {
    margin: 0;
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: 4rem 2rem;
    background: var(--white);
    border-radius: 10px;
    box-shadow: var(--shadow);
}

.empty-state p {
    font-size: 1.2rem;
    color: #666;
    margin-bottom: 1.5rem;
}

.empty-message {
    text-align: center;
    padding: 2rem;
    color: #666;
    font-size: 1.1rem;
}

/* Form Actions */
.form-actions {
    display: flex;
    gap: 1rem;
    margin-top: 1.5rem;
    flex-wrap: wrap;
}

.btn-cancel {
    display: inline-block;
    padding: 1rem 2rem;
    background: #ddd;
    color: var(--dark-gray);
    border: none;
    border-radius: 5px;
    text-decoration: none;
    font-weight: bold;
    text-align: center;
    transition: background 0.3s;
}

.btn-cancel:hover {
    background: #ccc;
}

/* File Info in Edit Form */
.file-info {
    background: var(--light-gray);
    padding: 1rem;
    border-radius: 5px;
}

.file-info p {
    margin: 0.3rem 0;
}

/* Alert Messages */
.alert {
    padding: 1rem;
    border-radius: 5px;
    margin-bottom: 1.5rem;
}

.alert-error {
    background: #fde8e8;
    border: 1px solid #f5c6c6;
    color: #721c24;
}

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

/* Token Access Page */
.token-access-container {
    max-width: 500px;
    margin: 2rem auto;
}

.token-card {
    background: var(--white);
    padding: 2.5rem;
    border-radius: 12px;
    box-shadow: var(--shadow);
}

.token-header {
    text-align: center;
    margin-bottom: 2rem;
}

.token-header h2 {
    color: var(--principal-color-blue);
    margin-bottom: 0.5rem;
}

.token-header p {
    color: #666;
}

.token-form .form-group {
    margin-bottom: 1.5rem;
}

.token-input {
    font-size: 1.2rem;
    text-align: center;
    letter-spacing: 2px;
}

.btn-validate-token {
    width: 100%;
    padding: 1rem;
    background: var(--principal-color-blue);
    color: var(--white);
    border: none;
    border-radius: 5px;
    font-size: 1.1rem;
    font-weight: bold;
    cursor: pointer;
    transition: background 0.3s;
}

.btn-validate-token:hover {
    background: #0066c4;
}

.token-info {
    margin-top: 2rem;
    padding-top: 2rem;
    border-top: 1px solid #eee;
    text-align: center;
}

.token-info h4 {
    color: var(--principal-color-blue);
    margin-bottom: 0.5rem;
}

.contact-email {
    color: var(--principal-color-blue);
    font-weight: bold;
    margin-top: 0.5rem;
}

/* Professor Dashboard */
.professor-dashboard {
    max-width: 1200px;
    margin: 0 auto;
}

.dashboard-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.dashboard-header h2 {
    color: var(--principal-color-blue);
}

.documents-table-container {
    background: var(--white);
    border-radius: 10px;
    padding: 1.5rem;
    box-shadow: var(--shadow);
    overflow-x: auto;
}

.documents-table {
    width: 100%;
    border-collapse: collapse;
    min-width: 600px;
}

.documents-table th {
    background-color: var(--principal-color-blue);
    color: var(--white);
    padding: 1rem;
    text-align: left;
}

.documents-table td {
    padding: 1rem;
    border-bottom: 1px solid #eee;
}

.documents-table tr:hover {
    background-color: var(--light-gray);
}

.doc-type-badge {
    display: inline-block;
    background: var(--principal-color-yellow);
    color: var(--principal-color-blue);
    padding: 0.2rem 0.8rem;
    border-radius: 15px;
    font-size: 0.8rem;
    font-weight: bold;
}

.actions {
    display: flex;
    gap: 0.5rem;
    justify-content: center;
}

.btn-view, .btn-edit, .btn-delete {
    padding: 0.3rem 0.6rem;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    text-decoration: none;
    font-size: 1.1rem;
}

.btn-view {
    background: #e3f2fd;
    color: #1976d2;
}

.btn-edit {
    background: #fff3e0;
    color: #f57c00;
}

.btn-delete {
    background: #fde8e8;
    color: #d32f2f;
}

.btn-view:hover, .btn-edit:hover, .btn-delete:hover {
    opacity: 0.8;
}

/* Upload Container */
.upload-container {
    max-width: 800px;
    margin: 0 auto;
    background: var(--white);
    padding: 2rem;
    border-radius: 10px;
    box-shadow: var(--shadow);
}

.upload-container h2 {
    color: var(--principal-color-blue);
    margin-bottom: 1.5rem;
}

.upload-form .form-group {
    margin-bottom: 1.5rem;
}

.upload-form .form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--principal-color-blue);
}

.upload-form .form-group input,
.upload-form .form-group select,
.upload-form .form-group textarea {
    width: 100%;
    padding: 0.8rem;
    border: 2px solid #ddd;
    border-radius: 5px;
    font-size: 1rem;
}

.upload-form .form-group input:focus,
.upload-form .form-group select:focus,
.upload-form .form-group textarea:focus {
    border-color: var(--principal-color-blue);
    outline: none;
}

.upload-form .form-group small {
    display: block;
    margin-top: 0.3rem;
    color: #666;
    font-size: 0.8rem;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

.btn-upload {
    background-color: var(--principal-color-yellow);
    color: var(--principal-color-blue);
    border: none;
    padding: 1rem 2rem;
    border-radius: 5px;
    font-weight: bold;
    cursor: pointer;
    width: 100%;
    font-size: 1rem;
    transition: opacity 0.3s;
}

.btn-upload:hover {
    opacity: 0.9;
}

/* Footer */
.footer {
    background-color: var(--principal-color-blue);
    color: var(--white);
    margin-top: 3rem;
}

.footer-content {
    padding: 3rem 5%;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    max-width: 1400px;
    margin: 0 auto;
}

.footer-section h4 {
    color: var(--principal-color-yellow);
    margin-bottom: 1rem;
}

.footer-section a {
    color: var(--white);
    text-decoration: none;
    display: block;
    margin-bottom: 0.5rem;
    opacity: 0.8;
    transition: opacity 0.3s;
}

.footer-section a:hover {
    opacity: 1;
}

.footer-bottom {
    text-align: center;
    padding: 1rem;
    border-top: 1px solid rgba(255,255,255,0.1);
}

/* Responsive Design */
@media (max-width: 768px) {
    .header {
        flex-direction: column;
        align-items: stretch;
        text-align: center;
    }
    
    .logo-container {
        justify-content: center;
    }
    
    .nav-menu {
        justify-content: center;
    }
    
    .user-info {
        justify-content: center;
    }
    
    .search-container {
        flex-direction: column;
    }
    
    .search-container input {
        min-width: auto;
    }
    
    .hero-content h2 {
        font-size: 1.8rem;
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .documents-grid {
        grid-template-columns: 1fr;
    }
    
    .info-row {
        grid-template-columns: 1fr;
        gap: 0.3rem;
    }
    
    .detail-header {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .dashboard-header {
        flex-direction: column;
        gap: 1rem;
        align-items: stretch;
    }
    
    .form-actions {
        flex-direction: column;
    }
    
    .token-card {
        padding: 1.5rem;
    }
    
    .documents-table-container {
        padding: 0.5rem;
    }
    
    .documents-table {
        font-size: 0.85rem;
    }
    
    .documents-table th,
    .documents-table td {
        padding: 0.5rem;
    }
    
    .actions {
        flex-wrap: wrap;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .main-content {
        padding: 1rem;
    }
    
    .hero-section {
        padding: 2rem 1rem;
    }
    
    .hero-content h2 {
        font-size: 1.5rem;
    }
    
    .categories-grid {
        grid-template-columns: 1fr 1fr;
    }
    
    .document-card {
        padding: 1rem;
    }
}