body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #f4f4f4;
    margin: 0;
    padding: 0;
}

.login-bg {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    background: linear-gradient(135deg, #0056b3, #00a8cc); /* Azul tenis */
}

.container { text-align: center; color: white; }
.card {
    background: white;
    padding: 40px;
    border-radius: 10px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.2);
}
.card input {
    display: block;
    width: 100%;
    padding: 10px;
    margin: 10px 0;
    border: 1px solid #ddd;
    border-radius: 5px;
}
.card button {
    width: 100%;
    padding: 10px;
    background-color: #0056b3;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 16px;
}

/* Dashboard */
header {
    background-color: #0056b3;
    color: white;
    padding: 15px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.controls {
    background: white;
    padding: 20px;
    display: flex;
    gap: 20px;
    align-items: center;
    border-bottom: 1px solid #ddd;
}
.controls select, .controls input {
    padding: 8px;
    font-size: 16px;
}

.actions-bar {
    padding: 20px;
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}
.actions-bar button {
    padding: 10px 20px;
    border: none;
    border-radius: 5px;
    color: white;
    cursor: pointer;
    font-weight: bold;
}
.btn-primary { background-color: #0056b3; }
.btn-success { background-color: #28a745; }
.btn-warning { background-color: #ffc107; color: black; }
.btn-info { background-color: #17a2b8; }
.logout-btn { background-color: #dc3545; padding: 5px 15px; border-radius: 4px; color: white; text-decoration: none; }

.student-list {
    padding: 20px;
    max-width: 800px;
    margin: 0 auto;
}
.student-row {
    background: white;
    padding: 15px;
    margin-bottom: 10px;
    border-radius: 8px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 2px 5px rgba(0,0,0,0.05);
}
.student-actions label {
    margin-left: 15px;
    cursor: pointer;
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    z-index: 1;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.5);
}
.modal-content {
    background-color: white;
    margin: 10% auto;
    padding: 20px;
    border-radius: 10px;
    width: 50%;
}
.close { color: #aaa; float: right; font-size: 28px; font-weight: bold; cursor: pointer; }
table { width: 100%; border-collapse: collapse; margin-top: 15px; }
th, td { border: 1px solid #ddd; padding: 8px; text-align: left; }
th { background-color: #f2f2f2; }