:root {
    --azul-marino: #164b70;
    --azul-claro: #e9f2f9;
}

body {
    background: #f4f6f9;
}

.app-navbar {
    background: var(--azul-marino);
}

.app-card {
    border: 1px solid #d9dee5;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.05);
    max-width: 860px;
    margin-left: auto;
    margin-right: auto;
}

.app-card .card-header {
    background: var(--azul-marino);
    color: #fff;
    font-weight: 600;
    font-size: 1.05rem;
}

.col-form-label {
    font-weight: 600;
    font-size: 0.9rem;
}

.form-control:disabled,
.form-select:disabled {
    background-color: #eef1f4;
    opacity: 1;
}

.seccion-titulo {
    background: var(--azul-claro);
    font-weight: 600;
    padding: 0.4rem 0.75rem;
    border-radius: 0.25rem;
    margin-bottom: 0.75rem;
}

.foto-alumno {
    width: 104px;
    height: 120px;
    object-fit: cover;
    border: 1px solid #d9dee5;
    border-radius: 0.375rem;
    background: #eef1f4;
}

.nav-tabs .nav-link {
    color: var(--azul-marino);
}

.nav-tabs .nav-link.active {
    font-weight: 600;
}

#tabla-alumnos td {
    font-size: 0.9rem;
}

/* Botones principales en azul similar al manual */
.btn-primary {
    --bs-btn-bg: #0879d9;
    --bs-btn-border-color: #0879d9;
    --bs-btn-hover-bg: #0668bc;
    --bs-btn-hover-border-color: #0668bc;
    --bs-btn-active-bg: #075da7;
    --bs-btn-active-border-color: #075da7;
    --bs-btn-disabled-bg: #0879d9;
    --bs-btn-disabled-border-color: #0879d9;
}