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

body {
    font-family: 'Arial', sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

.container {
    width: 100%;
    max-width: 400px;
    padding: 20px;
}

header {
    text-align: center;
    color: white;
    margin-bottom: 30px;
}

header h1 {
    font-size: 2.5em;
    margin-bottom: 10px;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
}

header p {
    font-size: 1.1em;
    opacity: 0.9;
}

.login-box {
    background: white;
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 15px 35px rgba(0,0,0,0.1);
}

.login-box h2 {
    text-align: center;
    margin-bottom: 30px;
    color: #333;
    font-size: 1.8em;
}

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

.form-group label {
    display: block;
    margin-bottom: 8px;
    color: #555;
    font-weight: bold;
}

.form-group input {
    width: 100%;
    padding: 12px;
    border: 2px solid #ddd;
    border-radius: 5px;
    font-size: 1em;
    transition: border-color 0.3s;
}

.form-group input:focus {
    outline: none;
    border-color: #667eea;
}

.btn-primary {
    width: 100%;
    padding: 12px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    border-radius: 5px;
    font-size: 1.1em;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0,0,0,0.2);
}

.register-link {
    text-align: center;
    margin-top: 20px;
    padding-top: 20px;
    border-top: 1px solid #eee;
}

.register-link a {
    color: #667eea;
    text-decoration: none;
    font-weight: bold;
}

.register-link a:hover {
    text-decoration: underline;
}

/* Estilos para el dashboard */
.dashboard {
    background: #f5f7fa;
    min-height: 100vh;
    padding: 20px;
}

.dashboard-header {
    background: white;
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    margin-bottom: 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.user-info h2 {
    color: #333;
    margin-bottom: 5px;
}

.user-info p {
    color: #666;
}

.logout-btn {
    padding: 10px 20px;
    background: #dc3545;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    text-decoration: none;
}

.course-section {
    background: white;
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    margin-bottom: 30px;
}

.course-title {
    color: #333;
    margin-bottom: 20px;
    font-size: 1.8em;
    border-bottom: 3px solid #667eea;
    padding-bottom: 10px;
}

.audio-players {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
    margin: 30px 0;
}

.player-section {
    background: #f8f9fa;
    padding: 20px;
    border-radius: 8px;
    border: 1px solid #dee2e6;
}

.player-section h3 {
    color: #495057;
    margin-bottom: 15px;
    text-align: center;
}

.playlist {
    list-style: none;
    max-height: 300px;
    overflow-y: auto;
}

.playlist li {
    padding: 10px;
    margin-bottom: 5px;
    background: white;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.2s;
    border-left: 3px solid transparent;
}

.playlist li:hover {
    background-color: #e9ecef;
    border-left-color: #667eea;
}

.playlist li.active {
    background-color: #667eea;
    color: white;
    border-left-color: #495057;
}

.audio-controls {
    margin-top: 15px;
    text-align: center;
}

.audio-controls audio {
    width: 100%;
    margin-top: 10px;
}

@media (max-width: 768px) {
    .audio-players {
        grid-template-columns: 1fr;
    }
    
    .dashboard-header {
        flex-direction: column;
        text-align: center;
        gap: 15px;
    }
}