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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f5f5f5;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

/* Encabezado */
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 0;
    border-bottom: 1px solid #ddd;
    margin-bottom: 30px;
}

h1 {
    font-size: 2.2rem;
    color: #2c3e50;
}

h2 {
    font-size: 1.8rem;
    color: #3498db;
    margin-bottom: 20px;
}

h3 {
    font-size: 1.4rem;
    color: #2c3e50;
}

/* Secciones */
section {
    background-color: #fff;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    padding: 25px;
    margin-bottom: 30px;
}

.upload-section {
    max-width: 600px;
    margin: 0 auto 30px;
}

/* Formularios */
.form-group {
    margin-bottom: 20px;
}

label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
}

input[type="text"],
input[type="file"] {
    width: 100%;
    padding: 12px 15px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 1rem;
}

input[type="file"] {
    padding: 10px;
    background-color: #f9f9f9;
}

/* Botones */
.btn {
    display: inline-block;
    padding: 10px 20px;
    border: none;
    border-radius: 4px;
    font-size: 1rem;
    cursor: pointer;
    text-decoration: none;
    transition: background-color 0.3s, transform 0.2s;
}

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

.btn-primary {
    background-color: #3498db;
    color: white;
}

.btn-primary:hover {
    background-color: #2980b9;
}

.btn-view {
    background-color: #2ecc71;
    color: white;
}

.btn-view:hover {
    background-color: #27ae60;
}

.btn-download {
    background-color: #f39c12;
    color: white;
}

.btn-download:hover {
    background-color: #e67e22;
}

.btn-back {
    background-color: #7f8c8d;
    color: white;
}

.btn-back:hover {
    background-color: #95a5a6;
}

.btn-control {
    background-color: #ecf0f1;
    color: #34495e;
    font-size: 0.9rem;
    padding: 8px 15px;
}

.btn-control:hover {
    background-color: #bdc3c7;
}

/* Lista de PDFs */
.pdf-list ul {
    list-style: none;
}

.pdf-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px;
    border-bottom: 1px solid #eee;
    transition: background-color 0.3s;
}

.pdf-item:hover {
    background-color: #f9f9f9;
}

.pdf-item:last-child {
    border-bottom: none;
}

.pdf-info {
    flex: 1;
}

.pdf-actions {
    display: flex;
    gap: 10px;
}

.no-pdf-message {
    text-align: center;
    color: #7f8c8d;
    padding: 20px;
    font-style: italic;
}

/* Mensajes */
.message {
    padding: 15px;
    border-radius: 4px;
    margin-bottom: 20px;
    animation: fadeIn 0.5s ease-in-out;
    position: relative;
}

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

.message-error {
    background-color: #f8d7da;
    border: 1px solid #f5c6cb;
    color: #721c24;
}

.message-info {
    background-color: #d1ecf1;
    border: 1px solid #bee5eb;
    color: #0c5460;
}

.message .close-btn {
    position: absolute;
    right: 10px;
    top: 10px;
    font-size: 1.2rem;
    line-height: 1;
    cursor: pointer;
    opacity: 0.5;
    transition: opacity 0.3s;
}

.message .close-btn:hover {
    opacity: 1;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(-10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Loader */
.loader-container {
    display: flex;
    justify-content: center;
    align-items: center;
    margin: 20px 0;
}

.loader {
    border: 4px solid #f3f3f3;
    border-top: 4px solid #3498db;
    border-radius: 50%;
    width: 30px;
    height: 30px;
    animation: spin 1s linear infinite;
    display: inline-block;
    margin-right: 10px;
}

.loader-text {
    font-size: 1rem;
    color: #34495e;
}

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

/* Pie de página */
footer {
    text-align: center;
    padding: 20px 0;
    margin-top: 30px;
    border-top: 1px solid #ddd;
    color: #7f8c8d;
}

/* Animaciones */
.fadeIn {
    animation: fadeIn 0.5s ease-in-out;
}

/* Responsivo */
@media (max-width: 768px) {
    .pdf-item {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .pdf-actions {
        margin-top: 15px;
        width: 100%;
        justify-content: space-between;
    }
    
    .btn {
        padding: 8px 15px;
        font-size: 0.9rem;
    }
}